阅读说明：本技术 专变计量单相电压故障处理方法及处理装置 (Special variable metering single-phase voltage fault processing method and processing device ) 是由 孙鑫 郑新 邵林 邓瓘 汪辉 张鹏 许克明 王波 王永强 余伟 于 2020-07-29 设计创作，主要内容包括：本发明公开了一种专变计量单相电压故障处理方法及处理装置,方法包括如下步骤：步骤1：对电路的A、B、C三相线路取电,并监控每相电路是否缺相、断相；步骤2：当A、B、C三相线路中任意一项缺相或断相后,通过其他未缺相、断相线路计算出缺相电压的相位值；步骤3：根据缺相电压的相位值,计算出缺相电压的电压值；步骤4：通过缺相电路的电压值,输出缺相电压,以供三相计量表计量。装置包括主控芯片以及与主控芯片连接的锁相单元、电压转化单元以及计量单元。本发明,可以根据两相正常电压转换电压给故障相供电。既能显示出漏计电量,也能转换电压接入电能表,让电能表正常计量。(The invention discloses a method and a device for processing a fault of a single-phase voltage with a special variable metering function, wherein the method comprises the following steps: step 1: power is supplied to A, B, C three-phase lines of the circuit, and whether each phase of circuit is open or not is monitored; step 2: when any one of A, B, C three-phase lines is open or broken, calculating the phase value of the open phase voltage through other lines; and step 3: calculating the voltage value of the phase-lacking voltage according to the phase value of the phase-lacking voltage; and 4, step 4: and the open-phase voltage is output through the voltage value of the open-phase circuit so as to be metered by the three-phase meter. The device comprises a main control chip, a phase locking unit, a voltage conversion unit and a metering unit, wherein the phase locking unit, the voltage conversion unit and the metering unit are connected with the main control chip. The invention can convert the voltage to supply power to the fault phase according to the two-phase normal voltage. The electric quantity can be displayed, the voltage can be converted to be connected into the electric energy meter, and the electric energy meter can normally measure.)

1. The method for processing the fault of the single-phase voltage with the specific variable metering is characterized by comprising the following steps of:

step 1: power is supplied to A, B, C three-phase lines of the circuit, and whether each phase of circuit is open or not is monitored;

step 2: when any one of A, B, C three-phase lines is open or broken, calculating the phase value of the open phase voltage through other lines;

and step 3: calculating the voltage value of the phase-lacking voltage according to the phase value of the phase-lacking voltage;

and 4, step 4: and the open-phase voltage is output through the voltage value of the open-phase circuit so as to be metered by the three-phase meter.

2. The method for processing the fault of the single-phase voltage with the dedicated variable metering according to claim 1, wherein in the step 2, the phase angle of the phase lacking or the phase breaking is phi, and the phase angle of the other phase not lacking or the phase breaking line is psi, then phi is psi +/-60 degrees.

3. The univariate metering single-phase voltage fault handling method according to claim 1, wherein in the step 3, the voltage value of the open-phase voltage is calculated according to Q-uissin phi.

4. The univariate metering single-phase voltage fault processing method according to claim 1, wherein in the step 4, the output of the open-phase voltage is that electricity is taken from the N phase, voltage is regulated, and the voltage is switched into a three-phase meter to be metered after being regulated to the historical maximum voltage of the open-phase or open-phase line.

5. A special transformer metering single-phase voltage fault processing device is characterized by comprising:

the phase locking unit is used for locking the phase value of the input voltage, calculating the phase value of the lacking phase voltage according to the locked phase value and then calculating the voltage value of the lacking phase voltage;

the voltage conversion unit is used for outputting open-phase voltage through the MOS tube circuit according to the voltage value calculated by the phase locking part;

the metering unit is used for metering a power value in real time;

wherein: the phase locking unit, the voltage conversion unit and the metering unit are all connected with the main control chip.

6. The single-phase voltage fault handling device of claim 5, wherein the phase locking unit comprises a phase detector PD, a low pass filter LP and a voltage controlled oscillator VCO, wherein the low pass filter LP is respectively connected with the phase detector PD and the voltage controlled oscillator VCO, the phase detector PD is connected to A, B, C three-phase lines, and the voltage controlled oscillator VCO is connected with the main control chip.

7. The single-phase voltage fault handling device of claim 6, wherein the VCO output is connected to the phase detector PD through a frequency divider.

8. The univariate metering single-phase voltage fault processing device according to claim 5, wherein the voltage conversion unit comprises a resistor R, one end of the resistor R is connected with the N-phase line, the other end of the resistor R is connected with two thyristors which are connected in anti-parallel through a capacitor L1, and the main control chip controls the on-off of the thyristors through an isolation optocoupler.

9. The univariate metering single-phase voltage fault processing device according to claim 5, wherein a current sampling module is connected to the metering unit.

10. The device for processing the fault of the single-phase voltage with the special variable metering function according to any one of claims 5 to 9, wherein a display unit is connected to the main control chip.

The technical field is as follows:

the invention relates to the technical field of electric power, in particular to a method and a device for processing a fault of a single-phase voltage of a specific variable metering.

Background art:

the user high-supply high-metering voltage-variable flow belongs to user assets, most of the user voltage faults do not affect normal electricity utilization of the user, but the electricity leakage of the electric energy meter is caused, external power failure is required for fault treatment, the fault time is delayed and treated by the user frequently due to various reasons, so that the problem cannot be solved, and the electricity leakage meter is enlarged.

The high-voltage electricity utilization inspection class processes metering faults of high-voltage users every year from tens of years, and most of the faults belong to voltage phase failure and phase loss faults when the average annual compensation electric quantity is more than two hundred thousand kilowatts. When the A-phase or C-phase voltage fault occurs, because the electric quantity which is missed to be measured cannot be accurately measured, only an assumed theoretical calculation and historical synchronous electric quantity comparison method can be adopted when the electric quantity is supplemented, but the method is difficult to reach the agreement with a user when the electric quantity is supplemented in later negotiation, and the supplementing difficulty is very high.

The invention content is as follows:

in order to overcome the defects of the prior art, the present invention provides a method and a device for processing a single-phase voltage fault with a dedicated variable metering, so as to solve the problems in the background art.

The technical scheme adopted by the invention for solving the technical problems is as follows:

the single-phase voltage fault processing method for the specific variable metering comprises the following steps of:

step 1: power is supplied to A, B, C three-phase lines of the circuit, and whether each phase of circuit is open or not is monitored;

step 2: when any one of A, B, C three-phase lines is open or broken, calculating the phase value of the open phase voltage through other lines;

and step 3: calculating the voltage value of the phase-lacking voltage according to the phase value of the phase-lacking voltage;

and 4, step 4: and the open-phase voltage is output through the voltage value of the open-phase circuit so as to be metered by the three-phase meter.

Preferably, in step 2, when the phase-missing or phase-disconnected phase angle is phi and the phase angle of the other phase-missing or phase-disconnected line is psi, phi is psi ± 60 °.

Preferably, in step 3, the voltage value of the open-phase voltage is calculated from Q — uissin Φ.

Preferably, in the step 4, the step of outputting the open-phase voltage is to take power from the N phase, regulate the voltage, and switch the voltage to the historical maximum value of the voltage of the open-phase or open-phase line before the voltage is measured by the three-phase meter.

A device for processing a single-phase voltage fault by a special transformer comprises:

the phase locking unit is used for locking the phase value of the input voltage, calculating the phase value of the lacking phase voltage according to the locked phase value and then calculating the voltage value of the lacking phase voltage;

the voltage conversion unit is used for outputting open-phase voltage through the MOS tube circuit according to the voltage value calculated by the phase locking part;

the metering unit is used for metering a power value in real time;

wherein: the phase locking unit, the voltage conversion unit and the metering unit are all connected with the main control chip.

Preferably, the phase locking unit includes a phase detector PD, a low-pass filter LP, and a voltage controlled oscillator VCO, where the low-pass filter LP is connected to the phase detector PD and the voltage controlled oscillator VCO, the phase detector PD is connected to A, B, C three-phase lines, and the voltage controlled oscillator VCO is connected to the main control chip.

Preferably, the output of the voltage-controlled oscillator VCO is connected with the phase detector PD through a frequency divider.

Preferably, the voltage conversion unit includes a resistor R, one end of the resistor R is connected to the N-phase line, the other end of the resistor R is connected to two anti-parallel thyristors through a capacitor L1, and the main control chip controls the on/off of the thyristors through an isolation optocoupler.

Preferably, the metering unit is connected with a current sampling module.

Preferably, the main control chip is connected with a display unit.

Compared with the prior art, the invention has the beneficial effects that:

the device is suitable for two voltage conversion modes of three-phase three-wire and three-phase four-wire. Three-phase three-wire: when one of the A phase and the C phase is in failure, the device can supply power to the failure phase by converting the normal phase voltage. Three-phase four-wire: when one of the phases A, B and C is in fault, the device can convert the voltage according to the normal voltage of the two phases to supply power to the fault phase.

The device of the invention can display the electric quantity of the leakage meter, and can also convert the voltage to be connected into the electric energy meter, so that the electric energy meter can normally meter.

Description of the drawings:

FIG. 1 is a schematic view of the treatment process of the present invention;

FIG. 2 is a schematic block diagram of the apparatus of the present invention;

fig. 3 is a schematic diagram of phase sampling of phase voltages in accordance with the present invention.

FIG. 4 is a schematic of the current sampling input of the present invention.

The present invention will be further described with reference to the following detailed description and accompanying drawings.

The specific implementation mode is as follows:

in order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1 to 4, the present invention provides a technical solution:

the fault processing method of the single-phase voltage with the specific variable metering comprises the following steps:

step 1: power is supplied to A, B, C three-phase lines of the circuit, and whether each phase of circuit is open or not is monitored;

step 2: when any one of A, B, C three-phase lines is open or broken, calculating the phase value of the open phase voltage through other lines;

and step 3: calculating the voltage value of the phase-lacking voltage according to the phase value of the phase-lacking voltage;

and 4, step 4: and the open-phase voltage is output through the voltage value of the open-phase circuit so as to be metered by the three-phase meter.

Specifically, in step 2, the phase loss or phase-off phase angle isThe phase angle of other non-open-phase and open-phase lines is psi

Specifically, in step 3, the voltage value of the open-phase voltage is determined according toAnd (6) calculating.

Specifically, in the step 4, the phase-failure voltage is output by taking electricity from the N phase, regulating the voltage, and switching the voltage to the historical maximum value of the voltage of the phase-failure or phase-failure line and then switching the voltage to a three-phase meter for metering.

A special transformer metering single-phase voltage fault processing device comprises:

the phase locking unit is used for locking the phase value of the input voltage, calculating the phase value of the lacking phase voltage according to the locked phase value and then calculating the voltage value of the lacking phase voltage;

the voltage conversion unit is used for outputting open-phase voltage through the MOS tube circuit according to the voltage value calculated by the phase locking part;

the metering unit is used for metering a power value in real time;

wherein: the phase locking unit, the voltage conversion unit and the metering unit are all connected with the main control chip.

Specifically, the phase locking unit comprises a phase detector PD, a low-pass filter LP and a voltage controlled oscillator VCO, wherein the low-pass filter LP is connected with the phase detector PD and the voltage controlled oscillator VCO respectively, the phase detector PD is connected to A, B, C three-phase lines, and the voltage controlled oscillator VCO is connected with a main control chip.

Specifically, the output of the voltage controlled oscillator VCO is connected with the phase detector PD through a frequency divider.

Specifically, the voltage conversion unit comprises a resistor R, one end of the resistor R is connected with the N-phase circuit, the other end of the resistor R is connected with two thyristors VT1 and VT2 which are connected in anti-parallel through a capacitor L1, and the master control chip controls the on-off of the thyristors through an isolation optocoupler.

Specifically, the metering unit is connected with a current sampling module.

Specifically, the main control chip is connected with a display unit.

The phase locking unit is mainly used for locking the phase value of the input voltage, calculating the phase value of the lacking phase voltage according to the locked phase value and then calculating the voltage value of the lacking phase voltage. Specifically, as shown in fig. 2, the phase detector consists of four basic parts, namely, a Phase Detector (PD), a Low Pass Filter (LPF), a Voltage Controlled Oscillator (VCO), and a frequency divider. The phase detector is used to convert the phase difference between two input signals ui (t) and uo (t) into error voltage output, and the frequency divider is used to divide the frequency of the high frequency signal output by the voltage controlled oscillator and then the frequency of the input signal ui (t)The rates are compared to enable phase error free frequency tracking of the input signal. VCO input u_iPhase angle of (t) and output u_i(t) the phase angle (signal) remains synchronized. So that it is possible to calculate the phase angle of the missing (open) phase line by the phase angle of the phase line other than the missing (open) phase. The VCO obtains a phase angle psi and a phase-missing (open) phase angle

Then

As shown in fig. 3, each phase of circuit voltage has a corresponding angle signal, the phase difference (u1(t) and u1 (t)) of the circuit signal to be detected is converted into voltage or current increment by using a nonlinear device, and then the voltage or current increment is sent to the input circuits a and b of the phase detector, and then passes through the post-stage components LP and VCO again.

In the invention, the voltage conversion unit mainly has the function of outputting open-phase voltage through the MOS tube circuit according to the voltage value calculated by the lock unit. As shown in FIG. 2, a resistor R is connected to an N-phase line, and then connected in series with anti-parallel thyristors VT1 and VT2 through a capacitor L1, when a phase failure occurs, a main control chip controls the VT1 and VT2 to be switched on, the N-phase voltage is increased due to the phase failure, the voltage is divided through a resistor R1, the capacitor L1 filters, the VT1 and VT2 regulate the voltage, the power is supplied to the failure phase, and the converted voltage is connected into a three-phase meter to enable the three-phase meter to meter normally.

In the invention, the metering unit is internally provided with three electric energy metering chips to meter the power value in real time.

In the invention, the display unit is mainly an LED liquid crystal display screen, and can display real-time voltage and power values in a split screen mode.

In the invention, the metering of the metering chip is realized by a current module, specifically, as shown in fig. 4, a TA20 alternating current transformer is adopted. The current ratio of the transformer is 5A/5mA, the secondary circuit is not allowed to be opened, and when the primary coil is used, the secondary circuit is connected with the measured current circuit in series. An anti-aliasing filter is adopted, which is composed of resistors R23 and R24 and capacitors C12 and C13, and the structure and parameters of the anti-aliasing filter have symmetry. The anti-interference function is strong, and the metering unit can work stably for a long time.

Due to the high supply and high metering mode of the two elements, when an A-phase or C-phase fault occurs, the voltage value and the angle of the fault element cannot be correctly acquired, but the other element is normal. Therefore, the numerical value of the fault element can be acquired by the same method, the voltage angle of the fault element is calculated by adding 60 degrees to or subtracting 60 degrees from the voltage angle of the normal element, and therefore the device converts the numerical value and the angle of the fault element through the numerical value and the angle of the normal element, so that the accessed three-phase meter can be accurately metered.

The device is suitable for two voltage conversion modes of three-phase three-wire and three-phase four-wire. Three-phase three-wire: when one of the A phase and the C phase is in failure, the device can supply power to the failure phase by converting the normal phase voltage. Three-phase four-wire: when one of the phases A, B and C is in fault, the device can convert the voltage according to the normal voltage of the two phases to supply power to the fault phase

The device of the invention can display the electric quantity of the leakage meter, and can also convert the voltage to be connected into the electric energy meter, so that the electric energy meter can normally meter.

It should be noted that the detailed description of the invention is not included in the prior art, or can be directly obtained from the market, and the detailed connection mode can be widely applied in the field or daily life without creative efforts, and the detailed description is not repeated here.

Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.