阅读说明：本技术 集中平台检测漏电保护控制器 (Leakage protection controller for detection of centralized platform ) 是由 周泽龙 于 2019-09-25 设计创作，主要内容包括：本发明公开了一种集中平台检测漏电保护控制器,包括现场检测环、漏电检测处理器、CPU、保护继电器和专用电源切断控制电路,所述现场检测环检测到喷泉平台有漏电发生时,彩灯外壳带电,其漏电电流传输到所述漏电检测处理器,所述漏电检测处理器检测到所述漏电电流达到或超过设定值时,输出保护信号给所述CPU,所述CPU经过可调的延时,启动所述保护继电器,所述保护继电器动作后,所述CPU控制启动所述专用电源切断控制电路切断变频器的输出和各柜内电源输出。实施本发明的集中平台检测漏电保护控制器,具有以下有益效果：能保护人避免触电,从而解决远离变频器进行检测的局限性。(The invention discloses a centralized platform detection leakage protection controller, which comprises a field detection ring, a leakage detection processor, a CPU, a protection relay and a special power supply cut-off control circuit, wherein when the field detection ring detects that leakage of a fountain platform occurs, a shell of a colored lamp is electrified, leakage current of the colored lamp is transmitted to the leakage detection processor, when the leakage detection processor detects that the leakage current reaches or exceeds a set value, a protection signal is output to the CPU, the CPU starts the protection relay after adjustable time delay, and after the protection relay acts, the CPU controls to start the special power supply cut-off control circuit to cut off the output of a frequency converter and the power supply output in each cabinet. The centralized platform detection leakage protection controller has the following beneficial effects: the protection people avoid electrocuteeing to solve and keep away from the converter and carry out the limitation that detects.)

1. The utility model provides a concentrate platform and detect earth leakage protection controller, its characterized in that, includes field detection ring, electric leakage detection treater, CPU, protective relay and special power supply and cuts off control circuit, when the field detection ring detects the fountain platform and has the electric leakage to take place, the color lamp shell is electrified, and its leakage current transmits the electric leakage detection treater, the electric leakage detection treater detects when leakage current reaches or exceeds the setting value, output protection signal gives CPU, CPU passes through adjustable time delay, starts protective relay, protective relay action back, CPU control starts special power supply cuts off control circuit cuts off the output and each cabinet internal power supply output of converter.

2. The centralized platform detection leakage protection controller of claim 1, wherein the set point is 30 mA.

3. The centralized platform detection earth leakage protection controller of claim 2, wherein the dedicated power down control circuit is a dedicated power down circuit breaker.

4. The centralized platform detection leakage protection controller according to any one of claims 1 to 3, further comprising a power module, connected to the CPU, for supplying power.

5. The centralized platform detection leakage protection controller according to claim 4, wherein the power module comprises a transformer, a rectifier bridge, a first capacitor, a first resistor, a second diode, a first triode, a third resistor, a first diode, a second triode, a third potentiometer, a second capacitor and a voltage output terminal, one end of a primary coil of the transformer is connected with one end of the 220V AC power, the other end of the primary coil of the transformer is connected with the other end of the 220V AC power, one end of a secondary coil of the transformer is connected with one AC input terminal of the rectifier bridge, the other end of the secondary coil of the transformer is connected with the other AC input terminal of the rectifier bridge, one DC output terminal of the rectifier bridge is respectively connected with an anode of the second diode, one end of the first resistor and one end of the first capacitor, the negative pole of second diode with the collecting electrode of first triode is connected, the base of first triode respectively with the other end of first resistance and the collecting electrode of second triode are connected, the projecting pole of first triode respectively with the one end of second resistance, a stiff end of third potentiometre, the one end of second electric capacity and the one end of voltage output end are connected, the projecting pole of second triode respectively with the other end of second resistance and the negative pole of first diode are connected, the base of second triode with the slip end of third potentiometre is connected, another direct current output end of rectifier bridge respectively with the other end of first electric capacity, the positive pole of first diode, another stiff end of third potentiometre, the other end of second electric capacity and the other end of voltage output end are connected.

6. The centralized platform detection leakage protection controller of claim 5, wherein the second diode is of type S-202T.

7. The centralized platform detection leakage protection controller of claim 6, wherein the power module further comprises a fourth resistor, one end of the fourth resistor is connected to the base of the first transistor, and the other end of the fourth resistor is connected to the collector of the second transistor.

8. The centralized platform detection earth leakage protection controller as claimed in claim 7, wherein the fourth resistor has a resistance of 32k Ω.

9. The centralized platform detection leakage protection controller of claim 4, wherein the first transistor is an NPN transistor.

10. The centralized platform detection leakage protection controller of claim 4, wherein the second transistor is a PNP transistor.

Technical Field

The invention relates to the field of electric leakage protection, in particular to a centralized platform detection electric leakage protection controller.

Background

Most fountain platforms (such as dry land fountain platforms) are composed of a water pump, a spray head and colored lamps, the water pump is installed in a pool below the fountain platform, the water pump of the water pump is connected with the spray head through a metal water pipe, the spray head is separated from the dry land platform or plane by about a few centimeters, a middle-hole colored lamp is sleeved on the spray head, a fountain water column sprays water outwards through a middle hole of the colored lamp, so that the water sprayed by the water column firstly falls onto a metal shell of the colored lamp, and if the water pump leaks electricity, the water column is electrified, and the metal shell flowing onto the colored lamp is electrified. Electromagnetic interference generated by the frequency converter can cause the leakage switches arranged at the upper end and the lower end of the frequency converter to generate misoperation, so that a water pump of the frequency converter cannot run. Although the operation of the variable-frequency water pump can be guaranteed by installing the air switch, the problem that personnel cannot be protected in time when electric leakage is not solved.

Disclosure of Invention

The present invention is directed to solve the above-mentioned problems of the prior art, and an object of the present invention is to provide a centralized platform detection leakage protection controller capable of protecting people from electric shock, thereby solving the limitation of detection far away from the frequency converter.

The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a centralized platform detects earth leakage protection controller, includes field detection ring, electric leakage detection treater, CPU, protective relay and special power supply cut-off control circuit, when field detection ring detected the fountain platform and had the electric leakage to take place, the color lamp shell was electrified, and its leakage current transmits to the electric leakage detection treater, the electric leakage detection treater detects when the leakage current reached or exceeded the setting value, output protection signal gave CPU, CPU passes through adjustable time delay, starts protective relay, protective relay moves the back, CPU control starts special power supply cut-off control circuit cuts off the output of converter and each in cabinet power output.

In the centralized platform detection leakage protection controller, the set value is 30 mA.

In the centralized platform detection earth leakage protection controller, the special power supply cut-off control circuit is a special power supply cut-off circuit breaker.

The centralized platform detection leakage protection controller also comprises a power supply module, wherein the power supply module is connected with the CPU and used for supplying power.

In the leakage protection controller for centralized platform detection according to the present invention, the power module includes a transformer, a rectifier bridge, a first capacitor, a first resistor, a second diode, a first triode, a third resistor, a first diode, a second triode, a third potentiometer, a second capacitor and a voltage output terminal, one end of a primary coil of the transformer is connected to one end of 220V ac, the other end of the primary coil of the transformer is connected to the other end of the 220V ac, one end of a secondary coil of the transformer is connected to one ac input terminal of the rectifier bridge, the other end of the secondary coil of the transformer is connected to the other ac input terminal of the rectifier bridge, one dc output terminal of the rectifier bridge is connected to an anode of the second diode, one end of the first resistor and one end of the first capacitor, and a cathode of the second diode is connected to a collector of the first triode, the base of first triode respectively with the other end of first resistance and the collecting electrode of second triode are connected, the projecting pole of first triode respectively with the one end of second resistance, a stiff end of third potentiometre, the one end of second electric capacity and the one end of voltage output end are connected, the projecting pole of second triode respectively with the other end of second resistance and the negative pole of first diode are connected, the base of second triode with the slip end of third potentiometre is connected, another direct current output end of rectifier bridge respectively with the other end of first electric capacity, the positive pole of first diode, another stiff end of third potentiometre, the other end of second electric capacity and the other end of voltage output end are connected.

In the centralized platform detection leakage protection controller, the type of the second diode is S-202T.

In the leakage protection controller for detection of a centralized platform, the power module further comprises a fourth resistor, one end of the fourth resistor is connected with the base electrode of the first triode, and the other end of the fourth resistor is connected with the collector electrode of the second triode.

In the centralized platform detection leakage protection controller, the resistance value of the fourth resistor is 32k Ω.

In the centralized platform detection leakage protection controller of the present invention, the first triode is an NPN type triode.

In the centralized platform detection leakage protection controller, the second triode is a PNP triode.

The centralized platform detection leakage protection controller has the following beneficial effects: because the field detection ring, the electric leakage detection processor, the CPU, the protective relay and the special power supply cut-off control circuit are arranged, the change of the metal shell of the colored lamp can be utilized to protect people from electric shock as long as the metal shell of the colored lamp is detected to have electric leakage, thereby solving the limitation of detecting by keeping away from the frequency converter.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a centralized platform detection earth leakage protection controller according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of leakage detection in the embodiment;

fig. 3 is a schematic circuit diagram of the power supply module in the embodiment.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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.

In the embodiment of the present invention, a schematic structural diagram of the centralized platform earth leakage detection controller is shown in fig. 1. Fig. 2 is a schematic diagram of leakage detection in an embodiment. In fig. 1, the centralized platform detection leakage protection controller includes a field detection ring 1, a leakage detection processor 2, a CPU3, a protection relay and a 4-dedicated power supply cut-off control circuit 5, when the field detection ring 1 detects that leakage occurs in the fountain platform, the colored lamp housing is electrified, the leakage current is transmitted to the leakage detection processor 2, when the leakage detection processor 3 detects that the leakage current reaches or exceeds a set value, a protection signal is output to a CPU3, the CPU3 is delayed by an adjustable amount, the protection relay 4 is started, and after the protection relay 4 acts, the CPU3 controls the start-up of the dedicated power supply cut-off control circuit 5 to cut off the output of the frequency converter and the output of the power supply in each cabinet.

It should be noted that, in the present embodiment, the set value is 30 mA. The dedicated power supply cutoff control circuit 5 is a dedicated power supply cutoff circuit breaker. Specifically, when the fountain platform leaks electricity, the colored lamp shell is electrified, the leakage current reaches the leakage detection processor 2 through signal transmission, the leakage detection processor 2 detects whether the leakage current reaches or exceeds 30mA, when the leakage current reaches 30mA, the protective signal output is started and sent to the CPU3 for processing, the CPU3 starts the protective relay 4 through adjustable short time delay, and the special power supply cut-off control circuit 5 is started immediately after the protective relay 4 acts to cut off the output of the frequency converter and the power supply output in each cabinet.

The invention finds a method for solving the protection function after electric leakage outside the frequency converter, namely a scheme for solving the problem directly on a fountain platform in contact with water. The invention can protect people from electric shock, thereby solving the limitation of detection far away from the frequency converter.

In this embodiment, the centralized platform detection leakage protection controller further includes a power module 6, and the power module 6 is connected to the CPU3 and is used for supplying power. Fig. 3 is a schematic circuit diagram of the power module in this embodiment. In fig. 3, the power module 6 includes a transformer T, a rectifier bridge Z, a first capacitor C1, a first resistor R1, a second diode D2, a first transistor Q1, a third resistor R3, a first diode D1, a second transistor Q2, a third potentiometer RP33, a second capacitor C2, and a voltage output Vo, wherein one end of a primary winding of the transformer T is connected to one end of the 220V ac power, the other end of the primary winding of the transformer T is connected to the other end of the 220V ac power, one end of a secondary winding of the transformer T is connected to one ac input end of the rectifier bridge Z, the other end of the secondary winding of the transformer T is connected to the other ac input end of the rectifier bridge Z, one dc output end of the rectifier bridge Z is connected to an anode of a second diode D2, one end of a first resistor R1, and one end of a first capacitor C1, a cathode of the second diode D2 is connected to a collector of the first transistor Q1, the base of the first triode Q1 is connected to the other end of the first resistor R1 and the collector of the second triode Q2, the emitter of the first triode Q1 is connected to one end of the second resistor R2, one fixed end of the third potentiometer RP33, one end of the second capacitor C2 and one end of the voltage output Vo, the emitter of the second triode Q2 is connected to the other end of the second resistor R2 and the cathode of the first diode D1, the base of the second triode Q2 is connected to the sliding end of the third potentiometer RP33, and the other dc output end of the rectifier bridge Z is connected to the other end of the first capacitor C1, the anode of the first diode D1, the other fixed end of the third potentiometer RP33, the other end of the second capacitor C2 and the other end of the voltage output Vo.

The low-voltage alternating current output by the transformer T is rectified by the rectifier Z and filtered by the first capacitor C1 to obtain direct current, and the direct current is transmitted to the voltage stabilizing part. The voltage stabilizing part is composed of a first triode Q1 (regulation), a second triode Q2 (amplification) and a first diode D1 which plays a role of voltage stabilization. The voltage on the first transistor Q1 is variable, and when the output voltage tends to decrease, the transistor voltage will automatically decrease, and the output voltage will be maintained constant. It can be seen that the first transistor Q1 acts as a variable resistor, keeping the output voltage substantially constant due to its regulation. The regulation of the first transistor Q1 is controlled by the second transistor Q2, the output voltage is divided by a third potentiometer RP3, and a portion of the output voltage is applied between the base of the second transistor Q2 and ground.

Since the voltage to ground of the emitter of the second transistor Q2 is stabilized by the first diode D1, the voltage to ground of the emitter of the second transistor Q2 can be considered to be constant, and this voltage is called the reference voltage. Thus, the change in the base voltage of the second transistor Q2 reflects the change in the output voltage. If the output voltage tends to decrease (in absolute terms, the same applies hereinafter), the voltage between the base and emitter of the second transistor Q2 also decreases, which causes the collector current of the second transistor Q2 to decrease and the collector voltage to increase. Since the second transistor Q2 and the first transistor Q1 are directly coupled, the collector voltage of the second transistor Q2 increases, i.e., the voltage between the base and emitter of the first transistor Q1 increases, which makes the first transistor Q1 conduct more strongly, the tube voltage drop decreases, and the output voltage is maintained constant. Similarly, if the output voltage tends to increase, the tube voltage drop of the first transistor Q1 is increased by the action of the second transistor Q2, and the output voltage is maintained.

The first diodes D1 are regulated by their characteristic that the forward voltage drop is substantially invariant with current when conducting in the forward direction. The forward voltage drop of the diode is about 0.7V, and a stable voltage of about 0.7V can be obtained. The voltage stabilization by utilizing the forward characteristic has good effect without utilizing the reverse breakdown characteristic, and has the advantage of providing lower stable voltage. The second resistor R2 is a current limiting resistor that provides forward current to the first diode D1. The first resistor R1 is a load resistor of the second transistor Q2 and a bias resistor of the first transistor Q1. The first capacitor C1 is used for reducing the AC internal resistance and ripple of the regulated power supply. Thereby obtaining precise and stable current and voltage output to ensure the working stability of the CPU 3.

The second diode D2 is provided to reduce the voltage drop across the transistor Q1 when the output current is large. The second diode D2 is model S-202T. Of course, in practical applications, the second diode D2 may also be another type of diode with similar functions.

In this embodiment, the first transistor Q1 is an NPN transistor. The second transistor Q2 is a PNP transistor. Certainly, in practical applications, the first transistor Q1 may be a PNP transistor, and the second transistor Q2 may also be an NPN transistor, but the structure of the circuit is also changed accordingly.

In this embodiment, the power module 6 further includes a fourth resistor R4, one end of the fourth resistor R4 is connected to the base of the first transistor Q1, and the other end of the fourth resistor R4 is connected to the collector of the second transistor Q2. The fourth resistor R4 is a current limiting resistor, and is used for current limiting protection of the base current of the first transistor Q1. The current limiting protection principle is as follows: when the base current of the first triode Q1 is large, the fourth resistor R4 can reduce the base current of the first triode Q1 to keep the base current in a normal working state, so that the elements in the circuit are not burnt out due to the large current, and the safety and reliability of the circuit are further enhanced. It should be noted that, in the present embodiment, the resistance of the fourth resistor R4 is 32k Ω. Of course, in practical applications, the resistance of the fourth resistor R4 may be adjusted according to specific situations, that is, the resistance of the fourth resistor R4 may be increased or decreased according to specific situations.

In a word, in this embodiment, the wiring of the pipeline and the component of the fountain platform forms a networking detection framework, and the leakage detection processor 2 can detect and distinguish the magnitude of the leakage current, judge the leakage condition, and execute the output control instruction. The special power supply cut-off circuit breaker is internally provided with a micro-motion actuating mechanism which is controlled by an external control signal, so that the rapid power supply cut-off is ensured. The invention can protect people from electric shock by using the change of the metal shell of the colored lamp only by detecting whether the metal shell of the colored lamp leaks electricity, thereby solving the limitation of detection far away from a frequency converter.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.