阅读说明：本技术 一种继电器寿命监测台粘/断故障电压校准用配适器及其校准方法 (Adapter for calibrating sticking/breaking fault voltage of relay life monitoring station and calibration method thereof ) 是由 瞿明生 于 2020-12-18 设计创作，主要内容包括：本发明公开了一种继电器寿命监测台粘/断故障电压校准用配适器及方法,可调电阻R-1的一端与可调电阻R-2、电感L-1、电解电容C-1、高频电容C-2的一端相连引出到接线端A18,R-1的另一端与开关K-3的b-1端相连引出到接线端A17。R-2的另一端与K-3的b-2端相连引出到接线端A19,K-3的b-3端与开关K-1、K-2的一端相连。K-1、L-1、K-2的另一端分别引出到接线端A14、A15、A16。C-1、C-2的另一端接到接地端GND。本发明实施例提供的一种监测台粘/断故障电压校准用配适器,精确模拟粘/断故障电压,解决现有技术存在干扰大、校准精度不高,难于精确调节到粘/断故障电压报警点,且费时、费力、费用高的难题。(The invention discloses an adapter and a method for calibrating the sticking/breaking fault voltage of a relay service life monitoring station, and an adjustable resistor R 1 One end of (1) and an adjustable resistor R 2 Inductor L 1 And an electrolytic capacitor C 1 High frequency capacitor C 2 Is connected to lead out to the terminals A18, R 1 Another end of (1) and a switch K 3 B of (a) 1 The end connection leads to terminal a 17. R 2 Another end of (1) and K 3 B of (a) 2 End-to-end connections leading to terminals A19, K 3 B of (a) 3 Terminal and switch K 1 、K 2 Are connected at one end. K 1 、L 1 、K 2 And the other ends lead out to terminals a14, a15, a16, respectively. C 1 、C 2 And the other end thereof is connected to the ground GND. The adapter for calibrating the sticking/breaking fault voltage of the monitoring station provided by the embodiment of the invention can accurately simulate the sticking/breaking fault voltage, and solves the problems that the prior art has large interference, low calibration precision and difficulty in accurately adjusting the sticking/breaking fault voltage to alarmAnd the problems of time consumption, labor waste and high cost are solved.)

1. The utility model provides a relay life monitoring station glues/breaks fault voltage calibration adapter which characterized in that:

comprising an adjustable resistor R₁Adjustable resistance R₂And LC low-pass filter, R₁One end of (a) is respectively connected with R₂Inductor L₁And an electrolytic capacitor C₁High frequency capacitor C₂Is connected to and leads out to the terminals a18, R₁Another end of (1) and a switch K₃B of (a)₁End connections lead to terminal a 17; r₂Another end of (1) and K₃B of (a)₂End-to-end connections leading to terminals A19, K₃B of (a)₃Terminals are respectively connected with a switch K₁、K₂One end of the two ends are connected; k₁The other end of the lead-out wire is led out to the terminals A14, L₁The other end of the lead-out wire is led out to the terminals A15 and K₂The other end of which leads to a terminal a 16; c₁、C₂Are all grounded, L₁、C₁And C₂And forming a filter.

2. The monitoring station sticking/breaking fault voltage calibration adaptor of claim 1, wherein: the terminal A14, the terminal A15, the terminal A16, the terminal A17, the terminal A18 and the terminal A19 all adopt BNC type connectors.

3. The monitoring station sticking/breaking fault voltage calibration adaptor of claim 1, wherein: also comprises a direct current digital voltmeter U₅D.C. digital voltmeter U₆(ii) a The U is₅Voltage measuring terminals of the U are respectively connected with the A17 and the A18, and the U₆The voltage measuring ends of the A voltage measuring device are respectively connected with the A18 and the A19; the terminal A17, the terminal A18 and the terminal A19 are correspondingly connected with the terminal A1, the terminal A2 and the terminal A3 of the monitoring station, and the terminal A14, the terminal A15 and the terminal A16 are correspondingly connected with the terminal A4, the terminal A5 and the terminal A6 of the monitoring station。

4. A method for calibrating a sticking/breaking fault voltage of a monitoring station, wherein the method is applied to an adapter according to any one of claims 1 to 3; the method comprises the following steps:

setting a load supply voltage U₀A resistor R arranged in the load power supply₀The fault voltage of the normally closed contact accounts for the applied load power supply voltage U₀Percentage of₁₁The normal open contact fault voltage accounts for the applied load power supply voltage U₀Percentage of₂₁Absolute value delta of maximum allowable relative error of fault voltage of normally closed contact₁₀Absolute value delta of maximum allowable relative error of fault voltage of normally open contact₂₀Calculating the resistance value and the power of the adjustable resistor;

the voltage measuring end of the observation voltmeter U5 is respectively connected with the A17 and the A18, and the observation voltmeter U₆The voltage measuring ends of the A voltage measuring device are respectively connected with the A18 and the A19; the terminal A17, the terminal A18 and the terminal A19 are correspondingly connected with the terminal A1, the terminal A2 and the terminal A3 of the monitoring station, and the terminal A14, the terminal A15 and the terminal A16 are correspondingly connected with the terminal A4, the terminal A5 and the terminal A6 of the monitoring station;

setting switch K₁、K₂On and off, K₃Hit to b₁Or b₂A terminal; wherein, K is₁、K₂Not simultaneously open or close;

and starting a fault voltage monitoring function of the monitoring station, adjusting the adjustable resistor, checking the indicating value of the observation voltmeter and the color displayed by the fault alarm lamp, and judging whether the adhesion/disconnection fault voltage of the monitoring station is qualified.

5. The method for calibrating the sticking/breaking fault voltage of the monitoring station as claimed in claim 4, wherein the calculating the resistance and the power of the adjustable resistor comprises:

according to the set U₀、R₀、δ₁₁、δ₁₀、δ₂₁、δ₂₀Respectively calculating the fault voltage theoretical value of the normally closed contact of the adjustable resistor RLower limit of V_1LAnd an upper limit V_1HLower limit V of fault voltage theoretical value of normally open contact_2LAnd an upper limit V_2H；

According to the V_1L、V_1HAnd V_2L、V_2HCalculating the adjustable resistance R at V_1L、V_1HAnd V_2L、V_2HLower limit and upper limit R of theoretical regulation range_1L、R_1H、R_2L、R_2HAnd power P_1L、P_1H、P_2L、P_2H；

According to R_1H、R_2HGreater of (A) and (B)_1L、P_1H、P_2L、P_2HThe larger one selects the resistance and power of the adjustable resistor.

6. The monitoring station stick/break fault voltage calibration method of claim 4, wherein the monitoring station stick/break fault voltage calibration method comprises a calibration method of a normally closed or normally open contact stick fault voltage, a calibration method of a normally closed or normally open contact break fault voltage.

7. The monitoring station stick/break fault voltage calibration method of claim 4, when opening a normally closed contact stick fault voltage monitoring function, comprising:

K₁closed K₂Opening, K₃Hit to b₁End, adjusting the adjustable resistance R₁And the normally closed contact is made to adhere to the fault alarm lamp to display green;

gradually decrease R₁Resistance value of, observation alarm lamp and alarm, when R₁When the resistance value is reduced to a certain value and the alarm lamp is changed from green to red, the alarm sounds, U₅The indication value is the lower limit of the actual value of the actual measured normally closed contact adhesive fault voltage;

regulating R₁Make U₅Indicated value of < V_1LAnd the normally closed contact is made to adhere to the fault alarm lamp to display red color, and the alarm sounds. Then gradually increasing R₁While observing the alarm lamp and the alarm, when R is₁Increase to a certain valueWhen the alarm is on, the alarm lamp turns from red to green, the alarm sounds off, and U is turned off₅The indication value is the upper limit of the actual value of the actual measured normally closed contact adhesive fault voltage;

when opening normally open contact and gluing trouble voltage monitoring function, include:

K₁disconnect K₂Closure, K₃Hit to b₁End, regulation of R₁Make U₅Indicated value of > V_2HAnd the normally open contact is made to be adhered with a fault alarm lamp to display green. Then gradually decrease R₁While observing the alarm lamp and the alarm, when R is₁When the resistance value is reduced to a certain value, the alarm lamp is changed from green to red, the alarm sounds, U₅The indication value is the lower limit of the actual value of the actually measured normally open contact viscous fault voltage;

regulating R₁Make U₅Indicated value of < V_2LAnd the normally open contact is made to adhere to the fault alarm lamp to display red color, and the alarm sounds. Then gradually increasing R₁While observing the alarm lamp and the alarm, when R is₁When the resistance value is increased to a certain value, the alarm lamp is changed from red to green, the alarm is sounded to be turned off, and U₅The indicating value is the upper limit of the actual value of the actually measured normally open contact viscous fault voltage;

and for the normal-open and normal-close contact viscous fault voltage, the upper limit and the lower limit of the actual value are within the upper limit and the lower limit of the theoretical value, the viscous fault voltage is qualified, otherwise, the viscous fault voltage is unqualified.

8. The method for calibrating the sticking/breaking fault voltage of the monitoring station as claimed in claim 4, wherein when the normally closed contact breaking fault voltage monitoring function is turned on, the method comprises the following steps:

K₁closed K₂Opening, K₃Hit to b₂A terminal;

adjusting the adjustable resistance R₂Make U₆Indicated value of > V_3HAnd the normally closed contact fault alarm lamp displays red color and the alarm sounds;

then gradually decrease R₂While observing the alarm lamp and the alarm, when R is₂When the resistance value is reduced to a certain value, the alarm lampChanging from red to green, the alarm sounding is turned off, U₆The indication value is the lower limit of the actual value of the actual fault voltage of the actually measured normally closed contact;

regulating R₂Make U₆Indicated value of < V_3LAnd the normally closed contact failure alarm lamp is made to display green;

then gradually increasing R₂While observing the alarm lamp and the alarm, when R is₂When the resistance value is increased to a certain value, the alarm lamp is changed from green to red, the alarm sounds, U₆The indication value is the upper limit of the actual value of the actual fault voltage of the actually measured normally closed contact;

when opening normally closed contact and breaking fault voltage monitoring function, include: k₁Disconnect K₂Closure, K₃Hit to b₂End, regulation of R₂Make U₆Indicated value of > V_4HThe normally open contact failure alarm lamp is made to display red color, and the alarm sounds;

gradually decrease R₂While observing the alarm lamp and the alarm, when R is₂When the resistance value is reduced to a certain value, the alarm lamp is changed from red to green, the alarm is sounded to be turned off, and U₆The indicating value is the lower limit of the actual value of the actually measured open contact break fault voltage;

regulating R₂Make U₆Indicated value of < V_4LAnd the normally open contact failure alarm lamp is enabled to display green;

gradually increasing R₂While observing the alarm lamp and the alarm, when R is₂When the resistance value is increased to a certain value, the alarm lamp is changed from green to red, the alarm sounds, U₆The indicating value is the upper limit of the actual value of the actually measured normally open contact break fault voltage;

and for the fault voltage of the normally closed or normally open contact, the upper limit and the lower limit of the actual value are within the range of the upper limit and the lower limit of the theoretical value, the fault voltage is qualified, otherwise, the fault voltage is not qualified.

Technical Field

The invention belongs to the technology of calibrating measuring instruments, and particularly relates to an adapter for calibrating the sticking/breaking fault voltage of a relay life monitoring station and a calibration method thereof.

Background

A relay is an electric control device that generates a predetermined step change in a controlled amount in an electric output circuit when a change in an input amount, that is, an excitation amount, meets a predetermined requirement. The method is generally applied to an automatic control circuit, and plays roles in automatic regulation, safety protection, circuit switching and the like in the circuit.

A typical electromagnetic relay is shown in schematic block diagram form in figure 1 of the accompanying drawings: the switching contact is composed of a coil, a switching contact (also called a movable contact), a normally closed contact (also called a static contact and a dynamic break contact) and a normally open contact (also called a dynamic make contact).

According to the terms, definitions and regulations of GJB 1042A-2002 general Specification for electromagnetic relays: the coil of the relay is called a release state when not energized, and is called an action state when the coil is energized to operate. Closing the contact: in the relay release state, the normally closed contact is a closed contact; in the relay action state, the normally open contact is a closed contact. And (3) breaking the contact: in the relay release state, the normally open contact is a break contact; in the relay operating state, the normally closed contact is an open contact. 10mV/10 muA-6V/10 mA is low level, 6V/10 mA-28V/100 mA is medium current, and 28V/100mA or more is high level.

For low level testing, the contact resistance between the closed contacts is less than or equal to 100 Ω during the cycling (note: convertible to an open fault voltage, e.g. an internally configured load resistance R)₀10mV/2 μ a 5k Ω, a load voltage of 10mV, and a closed contact resistance of 100 Ω, since R is₀And the closed contact is connected in series in the load loop, the voltage on the closed contact is as follows: the voltage of the interruption fault voltage between the closed contacts in the circulation process is less than or equal to 0.196mV because 10mV multiplied by 100 omega/(5000 omega +100 omega) ═ 0.196mV, the closed contacts are considered to be effective), the closed contacts are considered to be effective, namely the closed contacts are qualified, otherwise, the closed contacts are considered to be invalid, namely the open fault. For the medium current test, when the contact resistance between the closed contacts is less than or equal to 3 omega in the circulation process (note: the method can be converted into the breaking fault voltage to express), the closed contacts are considered to be effective, otherwise, the closed contacts are considered to be invalid. For high level testing, a closed contact is considered valid when a load voltage is applied across the closed contact, e.g., a voltage drop across the closed contact is less than or equal to 5% of the applied load voltage, otherwise the closed contact is considered invalid. For low, medium, and high level tests, a load voltage is applied to the open contacts, e.g., a voltage drop across the open contacts is greater than or equal to 95% of the applied load voltage, and the open contact is considered to be openAnd the open contact is effective, namely the open contact is qualified, otherwise, the open contact is considered to be invalid, namely the adhesion fault is detected.

Technical indexes of the relay are many, but a sticking/breaking fault voltage (sticking fault voltage, breaking fault voltage hereinafter referred to as sticking/breaking fault voltage) is an important index. Different parameters of the relay are tested by different instruments, and parameters such as the sticking/breaking fault voltage, the cycle life times and the like are tested by a monitoring station.

The monitoring station mainly comprises a coil power supply, a load power supply, a sticking/breaking fault voltage detection unit, a cycle life frequency detection unit, a control unit, an output binding post, a computer and the like. The device is widely applied to the scientific research and production of relays and used for testing parameters such as the sticking/breaking fault voltage and the cycle life times of the relays, and meanwhile, failure monitoring is carried out on the closed contacts and the open contacts. In the relay cycle life test, a monitoring platform is used for 4 faults under the release state and the action state of the relay: normally closed contact disconnection, normally open contact adhesion, normally closed contact adhesion, and normally open contact disconnection. The 4 faults are arranged below and are more obvious.

The principle block diagram of the monitoring station for testing the sticking/breaking fault voltage of the relay is shown in figure 2 in the attached drawing of the specification: the left frame is a monitoring station and is internally provided with a load power supply U₀Series resistance R₀Voltmeter U₁And U₂。U₀And R₀Providing voltage and current, R, to the relay contacts₀The relay consists of a series of resistors, different resistors are selected according to the magnitude of the current of a relay contact, and the load power supply outputs different currents. The right frame is a relay to be tested, and the wiring of a relay contact adopts a 4-wire method. The normally closed current end A4, the conversion current end A5, the normally open current end A6 and the coil power supply ends A7 and A8 of the monitoring station are respectively connected with a normally closed contact A9, a conversion contact A10, a normally open contact A11, a coil terminal A12 and a coil terminal A13 of the relay through cables. A normally closed voltage measuring end A1, a conversion voltage measuring end A2 and a normally open voltage measurementTerminal A3 is connected to A9, A10 and A11, respectively. The A4, A5 and A6 terminal wires of the monitoring station are thicker and are used for providing current for the relay contacts; the A1, A2 and A3 terminal wires are thin and are used for measuring the voltage drop of two ends of a relay contact, namely, a method of measuring the voltage by applying current is adopted. The terminals A1 and A2, A2 and A3 are used for voltage measurement, the input impedance is high, and the current shunting effect is negligible.

U₁The voltage drop of the contact between A10 and A9 is measured, and the normally closed contact is opened under the release state of the monitoring relay, namely the open fault voltage, and the normally closed contact is adhered under the action state of the monitoring relay, namely the viscous fault voltage. U shape₂The voltage drop of the contact between A10 and A11 is measured, and the bonding or sticking fault voltage of the normally open contact of the relay in a releasing state and the breaking or breaking fault voltage of the normally open contact of the relay in an action state are monitored. Will U₁And U₂The monitoring function of (2) is arranged below and is more obvious.

There are 4 double-colored pilot lamps on every 1 passageway of monitoring station, it is respectively: normally closed contact breaks fault indicator lamp, normally closed contact glues fault indicator lamp, normally open contact glues fault indicator lamp and normally open contact breaks fault indicator lamp. The contacts appear green when active and red when inactive. There are 1 alarm on the monitoring station, when the contact appears inefficacy, send the chimes of doom and flash of light. The two-color indicator lamps are arranged below the lamp holder, so that the lamp holder is more clear.

Taking high level test as an example, the load power supply voltage U is selected₀The internal configuration of resistor R was chosen to be 28V₀280 omega, when the load power supply output end is shortWhen the current is connected, the maximum output current is as follows: 28V/280 Ω ═ 0.1A.

And (3) calculating the viscous fault voltage: for open contacts, the viscous fault voltage is set to the load supply voltage U₀95% of (a), namely: 28V × 95% ═ 26.60V. When the adhesive fault voltage is more than or equal to 26.60V, the open contact is effective, namely the open contact is qualified, otherwise, the open contact is considered to be failed, namely the adhesive fault. And (3) calculating fault voltage: for closed contacts, the fault voltage is set to the applied load supply voltage U₀5% of (a), namely: 28V × 5% ═ 1.40V. When the breaking fault voltage is less than or equal to 1.40V, the closed contact is effective, namely the closed contact is qualified, otherwise, the closed contact is considered to be invalid, namely the open circuit fault.

The monitoring station sticking/breaking fault monitoring function is started, and the pulse voltage waveform output by the power supply end of the coil is shown in figure 3 in the attached drawing of the specification. V₀Is the coil pulse voltage amplitude, is the rated voltage value, T, of the relay coil power supply_onFor coil turn-on time, T_offFor coil turn-off

And time T is the pulse voltage period of the coil.

At t of the cycle life test₁～t₂In the meantime, the voltage applied to the coil jumps from 0V to V₀The relay is in an active state. The conversion contact is connected with the normally open contact to form a closed contact, and the current of 0.1A is transmitted from the load power supply U₀Positive terminal of (1) via R₀A5, A10, A11, A6, ground namely inflow U₀The negative terminal of (a). U shape₂The open fault voltage between the closed contacts, a10 and a11, is monitored at all times and the measured voltage is displayed on a display screen. When the measured voltage is less than or equal to 1.40V, the normally open contact fault indicating lamp displays green, the closed contact is effective, and the closed contact is qualified. When the measured voltage is more than 1.40V, the normally open contact breaks the fault indicator lamp to display red color, which indicates that the closed contact is invalid, and the alarm gives out alarm sound and flashes. At the same time, at t₁～t₂In between, the transfer contact is disconnected from the normally closed contact to become an open contact, U₁The open contact, i.e., the viscous fault voltage between a10 and a9, is monitored at all times and the measured voltage is displayed on a display screen. When the measured voltage is more than or equal to 26.60V, the normally closed contactThe point-bonding fault indicator lamp displays green, the disconnected contact is effective, and the disconnected contact is qualified. When the measured voltage appears<At 26.60V, the indicating lamp for indicating the fault of the normally closed contact is red, indicating that the open contact is failed, and the alarm gives out alarm sound and flashes.

At t₂～t₃From V to V, the voltage applied to the coil₀Jumping to 0V, releasing the relay, closing the switching contact and the normally closed contact to form a closed contact, and switching the current of 0.1A from U₀Positive terminal of (1) via R₀A5, A10, A9, A4, ground namely inflow U₀The negative terminal of (a). U shape₁The open fault voltage between the closed contacts, a10 and a9, is monitored at all times and the measured voltage is displayed on a display screen. When the measured voltage is less than or equal to 1.40V, the normally closed contact fault indicating lamp displays green, the closed contact is effective, and the closed contact is qualified. When the measured voltage is more than 1.40V, the normally closed contact is broken, the fault indicator lamp displays red color, the closed contact is failed, and the alarm gives out alarm sound and flashes. At the same time, at t₂～t₃In between, the switching contact is disconnected from the normally open contact to become an open contact, U₂The open contact, i.e., the viscous fault voltage between a10 and a11, is monitored at all times and the measured voltage is displayed on a display screen. When the measured voltage is more than or equal to 26.60V, the normally open contact bonding fault indicator lamp displays green, the disconnected contact is effective, and the disconnected contact is qualified. When the measured voltage appears<At 26.60V, the fault indicator lamp of normally open contact adhesive shows red color, which indicates that the open contact is failed, and the alarm gives out alarm sound and flashes. Thereafter, the above process is repeated periodically until the cycle test is finished.

The monitoring station is a relay scientific research production unit, is a special test device developed according to the requirements of scientific research, production, detection, inspection and the like of the relay, and does not have corresponding national verification regulations or calibration standards at present. The sticking/breaking fault voltage of the monitoring station is an important index, and the existing principle block diagram for calibrating the sticking/breaking fault voltage of the normally closed contact is shown in figure 4 in the attached drawing of the specification: a resistance box W₁D.C. voltmeter U₃Connected in parallel between A1, A2 and A4, A5 of the monitoring station by changing W₁Resistance value is thereby changedVariable W₁Simulating a sticking/breaking fault voltage by the voltage across the terminals, U₃The measured value is used as the U of the standard and monitoring station₁And comparing the measured values to judge whether the measured values are qualified or not. A functional block diagram for calibrating a normally open contact stick/break fault voltage is shown in FIG. 5 of the accompanying drawings: a resistance box W₂D.C. voltmeter U₄Connected in parallel between A2, A3 and A5, A6 of the monitoring station by changing W₂Resistance value thereby changing W₂Voltage across to simulate sticking/breaking fault voltage, U₄The measured value is used as the U of the standard and monitoring station₂And comparing the measured values to judge whether the measured values are qualified or not. Although this calibration provides a solution to the sticky/break fault voltage calibration, the following difficulties remain unresolved:

firstly, the method comprises the following steps: the monitoring station converts the direct current voltage into a pulse voltage signal through waveform conversion, and supplies power to a relay coil, thereby realizing a cycle life test. And because the monitoring station has more channels, large current and frequent switching, the monitoring station can generate a plurality of pulse interference signals, so that the calibration accuracy of the sticking/breaking fault voltage is not high, and especially in a low-level test, for example, a small signal with the load power supply voltage of 10mV can not be calibrated due to interference.

Secondly, the method comprises the following steps: the resistance box is used for simulating the sticking/breaking fault voltage, and the resistance value of the resistance box is changed step by step, so that the simulated sticking/breaking fault voltage is also changed step by step and is discontinuous, and a step voltage difference exists. If the minimum stepping amount of the resistance box is delta R and the minimum stepping amount of the corresponding analog sticking/breaking fault voltage is delta V, when the resolution of the sticking/breaking fault voltage of the monitoring station is smaller than delta V, some of the calibrated sticking/breaking fault voltages fall into two adjacent steps, namely delta V, so that the sticking/breaking fault voltages cannot be accurately calibrated.

Thirdly, the method comprises the following steps: multiple sticking/breaking fault voltage gears, R₀The alarm is a series of resistors with different resistance values, so that the alarm values of the sticking/breaking fault voltage are different. Each resistor R₀The alarm range of the sticking/breaking fault voltage, especially the breaking fault voltage, is narrow, and the alarm range of the sticking/breaking fault voltage is difficult to estimate due to the absence of a corresponding calculation method and reference experience, so that the resistance box is unknownThe resistance value and the adjusting range of the resistor box need to be reserved for a plurality of resistor boxes with different rated resistance values, and the resistor box can be adjusted repeatedly, thereby wasting time and labor, and having low efficiency and high cost. Sometimes, because the resistance value and the adjusting mode of the resistance box are not reasonably selected, the sticking/breaking fault voltage alarm point cannot be found.

Fourthly: multiple sticking/breaking fault voltage gears, R₀The resistor is a series of resistors with different resistance values, and has wide output current range and large output power range. Each resistor R₀There is a maximum output power. Without a corresponding calculation method and reference experience, it is difficult to estimate the power of the resistance box. If the selected power of the resistance box is low, the resistance box and even instrument equipment can be damaged, and if the selected power is high, the cost for purchasing the equipment is increased.

Technical indexes of the monitoring station are many, and the main technical indexes of a typical monitoring station are as follows:

relay coil power supply: output voltage range: 0V-60V, maximum allowable error: plus or minus 2 percent; circulation rate: 0.1 to 2000 times per minute; the cycle life number range can be preset: 1 time to 99999999 times. Load power supply output dc voltage range: 0V to 80V, maximum allowable error: plus or minus 2 percent; internally disposed load resistor R₀The low level is: 10mV/2 muA-50 mV/50 muA; the medium current is: 6V/10 mA-28V/100 mA; the high level is: 28V/100 mA-28V/1A (note: 10mV/2 muA indicates that the load voltage is 10mV DC voltage, and the current is 2 muA when the output end is short-circuited, then R₀10mV/2 μ a ═ 5k Ω; another example is 28V/1A, R₀＝28V/1A＝28Ω)。

Viscous failure voltage: for the open contact, the viscous fault voltage is set to be 80%, 90% and 95% of the load open circuit direct current voltage (note: when the load is open circuit, the output direct current voltage is equal to the load power voltage, so the output direct current voltage can also be represented by the load power voltage), the maximum allowable error is +/-5.0%, and the viscous fault voltage is judged to be invalid when the maximum allowable error is smaller than the set value. Breaking the fault voltage: for the closed contact, the set range of the fault voltage is direct current voltage of 0.10V-5.0V, the maximum allowable error is +/-5.0%, and the fault is judged to be invalid when the maximum allowable error is larger than the set value.

Disclosure of Invention

In order to solve the technical problems in the prior art, the invention provides an adapter and a method for calibrating the sticking/breaking fault voltage of a monitoring station. The concrete content is as follows: the invention provides an adapter for calibrating the sticking/breaking fault voltage of a monitoring station in a first aspect, which comprises an adjustable resistor R₁Adjustable resistance R₂And LC low-pass filter, R₁One end of (a) is respectively connected with R₂Inductor L₁And an electrolytic capacitor C₁High frequency capacitor C₂Is connected to and leads out to the terminals a18, R₁Another end of (1) and a switch K₃B of (a)₁End connections lead to terminal a 17; r₂Another end of (1) and K₃B of (a)₂End-to-end connections leading to terminals A19, K₃B of (a)₃Terminals are respectively connected with a switch K₁、K₂One end of the two ends are connected; k₁The other end of the lead-out wire is led out to the terminals A14, L₁The other end of the lead-out wire is led out to the terminals A15 and K₂The other end of which leads to a terminal a 16; c₁、C₂Are all grounded, L₁、C₁And C₂And forming a filter.

Further, the terminal A14, the terminal A15, the terminal A16, the terminal A17, the terminal A18 and the terminal A19 all adopt BNC type connectors.

Further, the device also comprises a direct current digital voltmeter U₅D.C. digital voltmeter U₆(ii) a The U is₅Voltage measuring terminals of the U are respectively connected with the A17 and the A18, and the U₆The voltage measuring ends of the A voltage measuring device are respectively connected with the A18 and the A19; the terminal A17, the terminal A18 and the terminal A19 are correspondingly connected with the terminal A1, the terminal A2 and the terminal A3 of the monitoring station, and the terminal A14, the terminal A15 and the terminal A16 are correspondingly connected with the terminal A4, the terminal A5 and the terminal A6 of the monitoring station.

The second aspect of the invention provides a monitoring station sticking/breaking fault voltage calibration method, which is applied to any one of the adapters; the method comprises the following steps:

setting a load supply voltage U₀A resistor R arranged in the load power supply₀The fault voltage of the normally closed contact accounts for the applied load power supply voltage U₀Percentage of₁₁The normal open contact fault voltage accounts for the applied load power supply voltage U₀Percentage of₂₁Absolute value delta of maximum allowable relative error of fault voltage of normally closed contact₁₀Absolute value delta of maximum allowable relative error of fault voltage of normally open contact₂₀Calculating the resistance value and the power of the adjustable resistor;

the voltage measuring end of the observation voltmeter U5 is respectively connected with the A17 and the A18, and the observation voltmeter U₆The voltage measuring ends of the A voltage measuring device are respectively connected with the A18 and the A19; the terminal A17, the terminal A18 and the terminal A19 are correspondingly connected with the terminal A1, the terminal A2 and the terminal A3 of the monitoring station, and the terminal A14, the terminal A15 and the terminal A16 are correspondingly connected with the terminal A4, the terminal A5 and the terminal A6 of the monitoring station;

setting switch K₁、K₂On and off, K₃Hit to b₁Or b₂A terminal; wherein, K is₁、K₂Not simultaneously open or close;

and starting a fault voltage monitoring function of the monitoring station, adjusting the adjustable resistor, checking the indicating value of the observation voltmeter and the color displayed by the fault alarm lamp, and judging whether the adhesion/disconnection fault voltage of the monitoring station is qualified.

Further, the calculating the resistance and the power of the adjustable resistor includes:

according to the set U₀、R₀、δ₁₁、δ₁₀、δ₂₁、δ₂₀Respectively calculating the lower limit V of the theoretical value of the fault voltage of the normally closed contact of the adjustable resistor R_1LAnd an upper limit V_1HLower limit V of fault voltage theoretical value of normally open contact_2LAnd an upper limit V_2H；

According to the V_1L、V_1HAnd V_2L、V_2HCalculating the adjustable resistance R at V_1L、V_1HAnd V_2L、V_2HLower limit and upper limit R of theoretical regulation range_1L、R_1H、R_2L、R_2HAnd power P_1L、P_1H、P_2L、P_2H；

According to R_1H、R_2HGreater of (A) and (B)_1L、P_1H、P_2L、P_2HThe larger one selects the resistance and power of the adjustable resistor.

Further, the monitoring station sticking/breaking fault voltage calibration method comprises a normally closed or normally open contact sticking fault voltage calibration method and a normally closed or normally open contact breaking fault voltage calibration method.

Further, when the normally closed contact is opened, the fault voltage monitoring function includes:

K₁closed K₂Opening, K₃Hit to b₁End, adjusting the adjustable resistance R₁And the normally closed contact is made to adhere to the fault alarm lamp to display green;

gradually decrease R₁Resistance value of, observation alarm lamp and alarm, when R₁When the resistance value is reduced to a certain value and the alarm lamp is changed from green to red, the alarm sounds, U₅The indication value is the lower limit of the actual value of the actual measured normally closed contact adhesive fault voltage;

regulating R₁Make U₅Indicated value of < V_1LAnd the normally closed contact is made to adhere to the fault alarm lamp to display red color, and the alarm sounds. Then gradually increasing R₁While observing the alarm lamp and the alarm, when R is₁When the resistance value is increased to a certain value, the alarm lamp is changed from red to green, the alarm is sounded to be turned off, and U₅The indication value is the upper limit of the actual value of the actual measured normally closed contact adhesive fault voltage;

when opening normally open contact and gluing trouble voltage monitoring function, include:

K₁disconnect K₂Closure, K₃Hit to b₁End, regulation of R₁Make U₅Indicated value of > V_2HAnd the normally open contact is made to be adhered with a fault alarm lamp to display green. Then gradually decrease R₁The resistance value of the alarm lamp and the alarm are observed at the same time,when R is₁When the resistance value is reduced to a certain value, the alarm lamp is changed from green to red, the alarm sounds, U₅The indication value is the lower limit of the actual value of the actually measured normally open contact viscous fault voltage;

regulating R₁Make U₅Indicated value of < V_2LAnd the normally open contact is made to adhere to the fault alarm lamp to display red color, and the alarm sounds. Then gradually increasing R₁While observing the alarm lamp and the alarm, when R is₁When the resistance value is increased to a certain value, the alarm lamp is changed from red to green, the alarm is sounded to be turned off, and U₅The indicating value is the upper limit of the actual value of the actually measured normally open contact viscous fault voltage;

and for the normal-open and normal-close contact viscous fault voltage, the upper limit and the lower limit of the actual value are within the upper limit and the lower limit of the theoretical value, the viscous fault voltage is qualified, otherwise, the viscous fault voltage is unqualified.

Further, when opening normally closed contact and breaking fault voltage monitoring function, include:

K₁closed K₂Opening, K₃Hit to b₂A terminal;

adjusting the adjustable resistance R₂Make U₆Indicated value of > V_3HAnd the normally closed contact fault alarm lamp displays red color and the alarm sounds;

then gradually decrease R₂While observing the alarm lamp and the alarm, when R is₂When the resistance value is reduced to a certain value, the alarm lamp is changed from red to green, the alarm is sounded to be turned off, and U₆The indication value is the lower limit of the actual value of the actual fault voltage of the actually measured normally closed contact;

regulating R₂Make U₆Indicated value of < V_3LAnd the normally closed contact failure alarm lamp is made to display green;

then gradually increasing R₂While observing the alarm lamp and the alarm, when R is₂When the resistance value is increased to a certain value, the alarm lamp is changed from green to red, the alarm sounds, U₆The indication value is the upper limit of the actual value of the actual fault voltage of the actually measured normally closed contact;

when the normally closed contact open fault voltage monitoring function is turned on,the method comprises the following steps: k₁Disconnect K₂Closure, K₃Hit to b₂End, regulation of R₂Make U₆Indicated value of > V_4HThe normally open contact failure alarm lamp is made to display red color, and the alarm sounds;

gradually decrease R₂While observing the alarm lamp and the alarm, when R is₂When the resistance value is reduced to a certain value, the alarm lamp is changed from red to green, the alarm is sounded to be turned off, and U₆The indicating value is the lower limit of the actual value of the actually measured open contact break fault voltage;

regulating R₂Make U₆Indicated value of < V_4LAnd the normally open contact failure alarm lamp is enabled to display green;

gradually increasing R₂While observing the alarm lamp and the alarm, when R is₂When the resistance value is increased to a certain value, the alarm lamp is changed from green to red, the alarm sounds, U₆The indicating value is the upper limit of the actual value of the actually measured normally open contact break fault voltage;

and for the fault voltage of the normally closed or normally open contact, the upper limit and the lower limit of the actual value are within the range of the upper limit and the lower limit of the theoretical value, the fault voltage is qualified, otherwise, the fault voltage is not qualified.

The invention has the beneficial effects that:

the adapter for calibrating the sticking/breaking fault voltage of the monitoring station provided by the embodiment of the invention can accurately simulate the sticking/breaking fault voltage, and solves the problems of large interference, low calibration precision, difficulty in accurately adjusting to a sticking/breaking fault voltage alarm point, time and labor consumption and high cost in the prior art.

The invention is simple and reliable, and is convenient to use. The calibration device can be formed by 1 adapter and 2 direct current digital voltmeters. The adapter is provided with the filter, and the BNC type connector can be connected by using a coaxial cable, so that various interferences are reduced and filtered, and the problem that the conventional interference is large, the calibration precision is not high, and even small signals in a low-level test cannot be calibrated is solved. The resistance value of 2 multi-turn precise adjustable resistors is continuously adjusted to realize the continuous change of the simulated sticking/breaking fault voltage, the calibration precision is improved, and the problems that the resistance value of the conventional resistor box is changed in a stepping mode, the simulated sticking/breaking fault voltage is changed in a stepping mode and is discontinuous, and the sticking/breaking fault voltage cannot be accurately calibrated due to the fact that stepping voltage difference exists are overcome.

Through theoretical analysis, a resistance value adjusting range and a power calculation formula of the adjustable resistor are deduced, the resistance value and the power of the adjustable resistor can be accurately calculated according to related parameters, and a theoretical basis is provided for selection of the multi-turn precise adjustable resistor. The problem that the resistance value of the resistance box cannot be adjusted to a sticking/breaking fault voltage alarm point if the resistance value of the resistance box is selected to be small because the resistance value range and the power of the resistance box are difficult to estimate without a corresponding calculation method and reference experience in the prior art is solved, and therefore calibration cannot be carried out. If the resistance value of the resistance box is selected to be too large, the resistance value of the resistance box also changes greatly even if the resistance box is finely adjusted, so that the resistance box is difficult to accurately adjust to a sticking/breaking fault voltage alarm point. If the power of the resistance box is low, the resistance box and even instrument equipment can be damaged, and if the power of the selected resistance box is high, the cost for purchasing the equipment is increased.

The method can accurately calculate the range and the alarm point of the sticking/breaking fault voltage, so that the sticking/breaking fault voltage can be quickly calibrated, the problems that the time and labor are wasted, the efficiency is low and the sticking/breaking fault voltage alarm point cannot be found due to unreasonable selection of the resistance value and the adjustment mode of the adjustable resistor because the range of the sticking/breaking fault voltage, the alarm point and the adjustment range of the corresponding adjustable resistor are unknown in the prior art and the resistance needs to be adjusted repeatedly are solved.

Description of the drawings:

FIG. 1 is a schematic block diagram of a typical electromagnetic relay;

FIG. 2 is a schematic block diagram of a monitoring station testing for relay stick/break fault voltages;

FIG. 3 is a waveform of pulse voltage output from the power supply terminal of the coil of the monitoring station;

FIG. 4 is a functional block diagram of a method of calibrating a normally closed contact stick/break fault voltage;

FIG. 5 is a functional block diagram of a method for calibrating a normally open contact stick/break fault voltage;

FIG. 6 is a circuit diagram of an adapter of the present invention;

FIG. 7 is a functional block diagram of calibrating a monitor station sticking/breaking fault voltage;

FIG. 8 is a simplified equivalent circuit diagram for calibrating normally closed/normally open contact pad fault voltage;

fig. 9 is a simplified equivalent circuit diagram for calibrating normally closed/normally open contact open fault voltage.

The specific implementation mode is as follows:

the invention provides an adapter for calibrating the sticking/breaking fault voltage of a monitoring station, which is shown in figure 6 and comprises the following components:

adjustable resistor R₁Adjustable resistance R₂And LC low-pass filter, R₁One end of (a) is respectively connected with R₂Inductor L₁And an electrolytic capacitor C₁High frequency capacitor C₂Is connected to and leads out to the terminals a18, R₁Another end of (1) and a switch K₃B of (a)₁End connections lead to terminal a 17; r₂Another end of (1) and K₃B of (a)₂End-to-end connections leading to terminals A19, K₃B of (a)₃Terminals are respectively connected with a switch K₁、K₂One end of the two ends are connected; k₁The other end of the lead-out wire is led out to the terminals A14, L₁The other end of the lead-out wire is led out to the terminals A15 and K₂The other end of which leads to a terminal a 16; c₁、C₂Are all grounded, L₁、C₁And C₂And forming a filter. L is₁、C₁And C₂And forming a filter for filtering interference signals. R₁And R₂The resistance value of the multi-turn precision adjustable resistor is precisely and continuously adjusted. Terminals A14, A15, A16, A17, A18 and A19 are BNC type connectors.

The principle block diagram of the monitoring station sticking/breaking fault voltage calibration by using the adapter and the direct current digital voltmeter is shown in figure 7 in the attached drawing of the specification. The A1, A2, A3, A4, A5 and A6 ends of the monitoring station are respectively connected with the A17, A18, A19, A14, A15 and A16 ends of the adapter, and the DC digital voltmeter U is connected with the monitoring station₅And U₆Are connected to a17, a18 and a18, a19, respectively.

K₃Hit to b₁End, K₁Closed K₂Disconnection sum K₁Disconnect K₂When closed, the equivalent circuit is simplifiedAs shown in figure 8 of the drawings in the specification, R₁、U₅For calibrating the viscous fault voltage of normally closed and normally open contacts. K₃Hit to b₂End, K₁Closed K₂Disconnection sum K₁Disconnect K₂When closed, the simplified equivalent circuit diagram is shown in figure 9 of the drawings in the specification. R₂、U₆For calibrating the open fault voltage of normally closed and normally open contacts.

When the breaking or sticking fault voltage of the normally closed contact and the normally open contact is calibrated, the four conditions are divided into four conditions: normally closed off fault voltage, normally open off fault voltage, normally closed adhesive fault voltage, normally open adhesive fault voltage. The calibration steps typically include the following:

setting a load supply voltage U₀A resistor R arranged in the load power supply₀The fault voltage of the normally closed contact accounts for the applied load power supply voltage U₀Percentage of₁₁The normal open contact fault voltage accounts for the applied load power supply voltage U₀Percentage of₂₁Absolute value delta of maximum allowable relative error of fault voltage of normally closed contact₁₀Absolute value delta of maximum allowable relative error of fault voltage of normally open contact₂₀Calculating the resistance value and the power of the adjustable resistor;

the voltage measuring end of the observation voltmeter U5 is respectively connected with the A17 and the A18, and the observation voltmeter U₆The voltage measuring ends of the A voltage measuring device are respectively connected with the A18 and the A19; the terminal A17, the terminal A18 and the terminal A19 are correspondingly connected with the terminal A1, the terminal A2 and the terminal A3 of the monitoring station, and the terminal A14, the terminal A15 and the terminal A16 are correspondingly connected with the terminal A4, the terminal A5 and the terminal A6 of the monitoring station;

setting switch K₁、K₂On and off, K₃Hit to b₁Or b₂A terminal; wherein, K is₁、K₂Not simultaneously open or close;

and starting a fault voltage monitoring function of the monitoring station, adjusting the adjustable resistor, checking the indicating value of the observation voltmeter and the color displayed by the fault alarm lamp, and judging whether the adhesion/disconnection fault voltage of the monitoring station is qualified.

Specifically, each fault voltage calibration method includes the following steps:

a calibration method for the sticking/breaking fault voltage of a monitoring station comprises a calibration method for the sticking fault voltage of a normally closed/normally open contact and a calibration method for the breaking fault voltage of the normally closed/normally open contact.

The calibration method of the normally closed/normally open contact viscous fault voltage comprises the following steps:

step 1, according to the U to be set or selected₀、R₀、δ₁₁、δ₁₀、δ₂₁、δ₂₀R is calculated according to the above formula₁R of (A) to (B)_1L、R_1H、R_2L、R_2H、V_1L、V_1H、V_2L、V_2H、P_1L、P_1H、P_2L、P_2HAccording to R_1H、R_2HGreater of (A) and (B)_1L、P_1H、P_2L、P_2HIs selected from R₁Resistance and power of;

step 2, connecting the monitored platform, the adapter and the direct current digital voltmeter according to the figure 7 in the attached drawing of the specification, K₁Closed K₂Opening, K₃Hit to b₁A terminal;

step 3, selecting a resistor R configured in the load power supply according to the required load current₀U with monitoring station₀、δ₁₁、δ₂₁Starting a sticking fault voltage monitoring function of the monitoring station;

step 4, adjusting R₁Make U₅Indicated value of > V_1HAnd the normally closed contact is made to adhere to the fault alarm lamp to display green. Then gradually decrease R₁While observing the alarm lamp and the alarm, when R is₁When the resistance value is reduced to a certain value and the alarm lamp is changed from green to red, the alarm sounds, U₅The indication value is the lower limit of the actual value of the actual measured normally closed contact adhesive fault voltage;

regulating R₁Make U₅Indicated value of < V_1LAnd the normally closed contact is made to adhere to the fault alarm lamp to display red color, and the alarm sounds. Then gradually increasing R₁Resistance value of, and simultaneous observation of newspaperAlarm lamp and alarm, when R₁When the resistance value is increased to a certain value, the alarm lamp is changed from red to green, the alarm is sounded to be turned off, and U₅The indication value is the upper limit of the actual value of the actual measured normally closed contact adhesive fault voltage;

step 5, K₁Disconnect K₂Closure, K₃Hit to b₁End, regulation of R₁Make U₅Indicated value of > V_2HAnd the normally open contact is made to be adhered with a fault alarm lamp to display green. Then gradually decrease R₁While observing the alarm lamp and the alarm, when R is₁When the resistance value is reduced to a certain value, the alarm lamp is changed from green to red, the alarm sounds, U₅The indication value is the lower limit of the actual value of the actually measured normally open contact viscous fault voltage;

regulating R₁Make U₅Indicated value of < V_2LAnd the normally open contact is made to adhere to the fault alarm lamp to display red color, and the alarm sounds. Then gradually increasing R₁While observing the alarm lamp and the alarm, when R is₁When the resistance value is increased to a certain value, the alarm lamp is changed from red to green, the alarm is sounded to be turned off, and U₅The indicating value is the upper limit of the actual value of the actually measured normally open contact viscous fault voltage;

and 6, for the normal open/normal close contact adhesive fault voltage, the upper limit and the lower limit of the actual value are within the upper limit and the lower limit of the theoretical value, the adhesive fault voltage is qualified, otherwise, the adhesive fault voltage is not qualified.

The calibration method of the fault voltage of the normally closed/normally open contact comprises the following steps:

step 1, according to the U to be set or selected₀、R₀、δ₃₁、δ₃₀、δ₄₁、δ₄₀R is calculated according to the above formula₂R of (A) to (B)_3L、R_3H、R_4L、R_4H、V_3L、V_3H、V_4L、V_4H、P_3L、P_3H、P_4L、P_4HAccording to R_3H、R_4HGreater of (A) and (B)_3L、P_3H、P_4L、P_4HIs selected from R₂Resistance and power of;

step 2, connecting the monitored platform, the adapter and the direct current digital voltmeter according to the figure 7 in the attached drawing of the specification, K₁Closed K₂Opening, K₃Hit to b₂A terminal;

step 3, selecting a resistor R configured in the load power supply according to the required load current₀U with monitoring station₀、δ₃₁、δ₄₁Starting the fault voltage monitoring function of the monitoring station;

step 4, adjusting R₂Make U₆Indicated value of > V_3HAnd the normally closed contact fault alarm lamp is made to display red color and the alarm sounds. Then gradually decrease R₂While observing the alarm lamp and the alarm, when R is₂When the resistance value is reduced to a certain value, the alarm lamp is changed from red to green, the alarm is sounded to be turned off, and U₆The indication value is the lower limit of the actual value of the actual fault voltage of the actually measured normally closed contact;

regulating R₂Make U₆Indicated value of < V_3LAnd the normally closed contact failure alarm lamp is made to display green. Then gradually increasing R₂While observing the alarm lamp and the alarm, when R is₂When the resistance value is increased to a certain value, the alarm lamp is changed from green to red, the alarm sounds, U₆The indication value is the upper limit of the actual value of the actual fault voltage of the actually measured normally closed contact;

step 5, K₁Disconnect K₂Closure, K₃Hit to b₂End, regulation of R₂Make U₆Indicated value of > V_4HAnd the normally open contact failure alarm lamp is made to display red color and the alarm is made to sound. Then gradually decrease R₂While observing the alarm lamp and the alarm, when R is₂When the resistance value is reduced to a certain value, the alarm lamp is changed from red to green, the alarm is sounded to be turned off, and U₆The indicating value is the lower limit of the actual value of the actually measured open contact break fault voltage;

regulating R₂Make U₆Indicated value of < V_4LAnd the normally open contact failure alarm lamp is enabled to display green. Then gradually increasing R₂The resistance value of the alarm lamp and the alarm are observed at the same time,when R is₂When the resistance value is increased to a certain value, the alarm lamp is changed from green to red, the alarm sounds, U₆The indicating value is the upper limit of the actual value of the actually measured normally open contact break fault voltage;

and 6, regarding the fault voltage of the normally closed/normally open contact, the upper limit and the lower limit of the actual value are within the range of the upper limit and the lower limit of the theoretical value, the fault voltage is qualified, otherwise, the fault voltage is not qualified.

In this embodiment, a D38-4EA type relay high-level life monitoring station manufactured by cek electronics ltd is taken as an example for explanation, and the main technical indexes are as follows: load power supply voltage: 6V, 28V, maximum allowable error: plus or minus 2 percent; resistance provided inside the load power supply: 6V/10mA, 6V/100mA, 28V/10mA, 28V/100mA, 28V/500mA and 28V/1A; viscous failure voltage: 80%, 90%, 95% of the load supply voltage, maximum allowed error: plus or minus 5 percent; breaking the fault voltage: 0.10V-5.0V, maximum allowable error: 5 percent.

Now with the load supply voltage U₀28V, internal resistor R₀28V/100mA is 280 omega, and the viscous fault voltage is delta of the load power supply voltage₁₁＝δ₂₁95% of the fault voltage is delta of the load supply voltage₃₁＝δ₄₁5%, i.e. 28V × 5%, 1.40V, δ₁₀＝δ₂₀＝5％，δ₃₀＝δ₄₀The description is made on a condition of 5%.

And (3) calculating the result: v_1L＝25.270V、V_1H＝27.930V、V_2L＝25.270V、V_2H＝27.930V、R_1L＝2.592kΩ、R_1H＝111.72kΩ、R_2L＝2.592kΩ、R_2H＝111.72kΩ、P_1L＝0.246W、P_1H＝6.98mW、P_2L＝0.246W、P_2H＝6.98mW，V_3L＝1.330V、V_3H＝1.470V、V_4L＝1.330V、V_4H＝1.470V、R_3L＝13.963Ω、R_3H＝15.515Ω、R_4L＝13.963Ω、R_4H＝15.515Ω、P_3L＝0.127W、P_3H＝0.139W P_4L＝0.127W、P_4H＝0.139W。

From which R can be seen_1H、R_2HThe larger of (A) is 111.72k Ω, P_1L、P_1H、P_2L、P_2HIs 0.246W; r_3H、R_4HThe larger of (2) is 15.515 omega, P_3L、P_3H、P_4L、P_4HThe larger of (2) is 0.139W. The selection principle of the resistance and the power is to leave some margin properly, the precision of the standard instrument is higher than that of the calibrated instrument by more than 3 times according to the quantity value transmission requirement, and R is considered comprehensively₁And R₂The resistance values of the adjustable resistor are respectively selected to be 114k omega and 18 omega, the maximum allowable errors are +/-1%, and the power is 0.5W. DC digital voltmeter U₅、U₆The maximum allowable error of the DC voltage measurement is better than +/-1.0 multiplied by 10 by 1 (or 2) U.S. 6 bit half 34410A type digital multimeter produced by the German technology company and using the DC voltage measurement function of the digital multimeter^-4。

The calibration method of the normally closed/normally open contact viscous fault voltage comprises the following steps:

step 1, connecting a monitored station, an adapter and a digital multimeter according to a figure 7 in a drawing of the specification, connecting a direct-current voltage measuring end of the digital multimeter to A17 and A18 ends, and connecting K to the A17 and the A18 ends₁Closed K₂Opening, K₃Hit to b₁A terminal;

step 2, setting U of monitoring station₀＝28V、R₀＝280Ω、δ₁₁＝95％、δ₂₁95%, starting a sticky fault voltage monitoring function of the monitoring station;

step 3, adjusting R₁Make U₅Indicated value of > V_1H27.930V, and the normally closed contact adhesion failure warning lamp is displayed in green. Then gradually decrease R₁While observing the alarm lamp and the alarm, when R is₁When the resistance value is reduced to a certain value and the alarm lamp is changed from green to red, the alarm sounds, U₅The indicated value of the voltage is 25.553V, namely the lower limit of the actual value of the actual measurement normally closed contact viscous fault voltage;

regulating R₁Make U₅Indicated value of < V_1L25.270V, the normally closed contact is made to stick to the fault alarm lamp, the color shows red, and the alarm sounds. Then gradually increasing R₁While observing the alarm lamp and the alarm, when R is₁When the resistance value is increased to a certain value, the alarm lamp is changed from red to green, the alarm is sounded to be turned off, and U₅The indicated value of the voltage is 27.628V, namely the upper limit of the actual value of the actual measurement normally closed contact viscous fault voltage;

step 4, K₁Disconnect K₂Closure, K₃Hit to b₁End, regulation of R₁Make U₅Indicated value of > V_2H27.930V, and the normally open contact sticking failure warning lamp is displayed in green. Then gradually decrease R₁While observing the alarm lamp and the alarm, when R is₁When the resistance value is reduced to a certain value and the alarm lamp is changed from green to red, the alarm sounds, U₅The indicating value of the normally open contact is 25.541V, namely the lower limit of the actual value of the actual measurement of the viscous fault voltage of the normally open contact;

regulating R₁Make U₅Indicated value of < V_2L25.270V, the normally open contact is made to be stuck with the fault alarm lamp to display red color, and the alarm sounds. Then gradually increasing R₁While observing the alarm lamp and the alarm, when R is₁When the resistance value is increased to a certain value, the alarm lamp is changed from red to green, the alarm is sounded to be turned off, and U₅The indicated value 27.612V is the upper limit of the actual value of the actual measurement of the viscous fault voltage of the normally open contact;

and 5, for the normal open/normal close contact viscous fault voltage, the upper limit and the lower limit of the actual value are within the range of the upper limit and the lower limit of the theoretical value, and the viscous fault voltage is qualified.

The calibration method of the fault voltage of the normally closed/normally open contact comprises the following steps:

step 1, connecting a monitored platform, an adapter and a direct current digital voltmeter according to a figure 7 in a drawing of the specification, connecting direct current voltage measuring ends of the digital multimeter to A18 and A19 ends, and connecting K to K₁Closed K₂Opening, K₃Hit to b₂A terminal;

step 2, setting U of monitoring station₀＝28V、R₀＝280Ω、δ₃₁＝5％、δ₄₁Starting the fault voltage monitoring function of the monitoring station if the fault voltage is 5 percent;

step 3, adjustingNode R₂Make U₆Indicated value of > V_3HAnd the normally closed contact failure alarm lamp is made to display red color and the alarm sounds when the voltage is 1.470V. Then gradually decrease R₂While observing the alarm lamp and the alarm, when R is₂When the resistance value is reduced to a certain value and the alarm lamp is changed from red to green, the alarm is sounded to be turned off, and U₆The indicated value of the voltage is 1.350V, namely the lower limit of the actual value of the actual fault voltage of the actually measured normally closed contact;

regulating R₂Make U₆Indicated value of < V_3L1.330V, and the normally closed contact off failure warning lamp is made to display green. Then gradually increasing R₂While observing the alarm lamp and the alarm, when R is₂When the resistance value is increased to a certain value, the alarm lamp is changed from green to red, the alarm sounds, U₆The indicated value of the voltage is 1.450V, namely the upper limit of the actual value of the actual fault voltage of the actually measured normally closed contact;

step 4, K₁Disconnect K₂Closure, K₃Hit to b₂End, regulation of R₂Make U₆Indicated value of > V_4HAnd the normally open contact failure alarm lamp is made to display red color and the alarm sounds when the voltage is 1.470V. Then gradually decrease R₂While observing the alarm lamp and the alarm, when R is₂When the resistance value is reduced to a certain value and the alarm lamp is changed from red to green, the alarm is sounded to be turned off, and U₆The indication value of the normally open contact is 1.355V, namely the lower limit of the actual value of the actually measured open contact fault voltage;

regulating R₂Make U₆Indicated value of < V_4L1.330V, and the normally open contact failure warning lamp is caused to display green. Then gradually increasing R₂While observing the alarm lamp and the alarm, when R is₂When the resistance value is increased to a certain value, the alarm lamp is changed from green to red, the alarm sounds, U₆The indication value of the normally open contact is 1.457V, namely the upper limit of the actual value of the actually measured open contact fault voltage;

and 5, for the fault voltage of the normally closed/normally open contact, the upper limit and the lower limit of the actual value are within the range of the upper limit and the lower limit of the theoretical value, and the fault voltage is qualified.

The adapter for calibrating the sticking/breaking fault voltage of the monitoring station provided by the embodiment of the invention can accurately simulate the sticking/breaking fault voltage, and solves the problems of large interference, low calibration precision, difficulty in accurately adjusting to a sticking/breaking fault voltage alarm point, time and labor consumption and high cost in the prior art.

The invention is simple and reliable, and is convenient to use. The calibration device can be formed by 1 adapter and 2 direct current digital voltmeters. The adapter is provided with the filter, and the BNC type connector can be connected by using a coaxial cable, so that various interferences are reduced and filtered, and the problem that the conventional interference is large, the calibration precision is not high, and even small signals in a low-level test cannot be calibrated is solved. The resistance value of 2 multi-turn precise adjustable resistors is continuously adjusted to realize the continuous change of the simulated sticking/breaking fault voltage, the calibration precision is improved, and the problems that the resistance value of the conventional resistor box is changed in a stepping mode, the simulated sticking/breaking fault voltage is changed in a stepping mode and is discontinuous, and the sticking/breaking fault voltage cannot be accurately calibrated due to the fact that stepping voltage difference exists are overcome.

Through theoretical analysis, a resistance value adjusting range and a power calculation formula of the adjustable resistor are deduced, the resistance value and the power of the adjustable resistor can be accurately calculated according to related parameters, and a theoretical basis is provided for selection of the multi-turn precise adjustable resistor. The problem that the resistance value of the resistance box cannot be adjusted to a sticking/breaking fault voltage alarm point if the resistance value of the resistance box is selected to be small because the resistance value range and the power of the resistance box are difficult to estimate without a corresponding calculation method and reference experience in the prior art is solved, and therefore calibration cannot be carried out. If the resistance value of the resistance box is selected to be too large, the resistance value of the resistance box also changes greatly even if the resistance box is finely adjusted, so that the resistance box is difficult to accurately adjust to a sticking/breaking fault voltage alarm point. If the power of the resistance box is low, the resistance box and even instrument equipment can be damaged, and if the power of the selected resistance box is high, the cost for purchasing the equipment is increased.

The method can accurately calculate the range and the alarm point of the sticking/breaking fault voltage, so that the sticking/breaking fault voltage can be quickly calibrated, the problems that the time and labor are wasted, the efficiency is low and the sticking/breaking fault voltage alarm point cannot be found due to unreasonable selection of the resistance value and the adjustment mode of the adjustable resistor because the range of the sticking/breaking fault voltage, the alarm point and the adjustment range of the corresponding adjustable resistor are unknown in the prior art and the resistance needs to be adjusted repeatedly are solved.