CN114566941B - Residual current and switch state monitoring protection device and method - Google Patents
Residual current and switch state monitoring protection device and method Download PDFInfo
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- CN114566941B CN114566941B CN202210213292.1A CN202210213292A CN114566941B CN 114566941 B CN114566941 B CN 114566941B CN 202210213292 A CN202210213292 A CN 202210213292A CN 114566941 B CN114566941 B CN 114566941B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/126—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wireless data transmission
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Abstract
The invention relates to the technical field of circuit data monitoring and discloses a residual current and switch state monitoring protection device and method.
Description
Technical Field
The invention relates to the technical field of circuit safety monitoring, in particular to a residual current and switch state monitoring protection device and method.
Background
Because the electricity consumption environment is complex, the load types are various, the quality of electric equipment is uneven, certain leakage current exists in the final-stage protection leakage circuit breaker in the use process, and the leakage current value reaches the threshold value of the final-stage protection leakage circuit breaker, so that the leakage risk exists.
Especially, under the condition that the branches at the lower end of the intermediate-level protection residual-current circuit breaker are more, the electric leakage current value of the intermediate-level protection residual-current circuit breaker is larger, so that the intermediate-level protection residual-current circuit breaker has electric leakage tripping risks, and even the risk of override tripping occurs.
Because the existing residual current protection scheme has the risk of override trip, once faults occur, the power failure range is wide, and meanwhile, difficulties are brought to quick searching and fault removal of the patrol staff.
Disclosure of Invention
The invention provides a residual current and switch state monitoring protection device and method, which solve the technical problem that the residual current has an override trip risk.
In view of the foregoing, a first aspect of the present invention provides a residual current and switch state monitoring protection device, including: the device comprises a leakage signal acquisition module, an MCU module, a tripping circuit module and a circuit breaking module;
the leakage signal acquisition module comprises a zero sequence current transformer and a signal conditioning circuit, wherein the zero sequence current transformer is used for acquiring leakage current of a loop to be detected so as to generate a leakage voltage signal and transmitting the leakage voltage signal to the signal conditioning circuit, and the signal conditioning circuit is used for carrying out analog-to-digital conversion on the leakage voltage signal so as to obtain a leakage voltage digital signal and also used for sending the leakage voltage digital signal to the MCU module;
the MCU module is used for calculating a leakage current effective value according to the leakage voltage digital signal, and generating a tripping signal and sending the tripping signal to the tripping circuit module when the leakage current effective value exceeds a preset leakage current protection action threshold value;
the tripping circuit module is used for receiving the tripping signal and sending the tripping signal to the circuit breaking module;
the circuit breaker module comprises an intermediate protection circuit breaker, a carrier module and a final protection circuit breaker, wherein the final protection circuit breaker is connected with the intermediate protection circuit breaker through the carrier module;
the final protection circuit breaker is used for receiving the tripping signal, executing tripping operation according to the tripping signal, generating a tripping completion signal after the tripping operation is completed, and sending the tripping completion signal to the intermediate protection circuit breaker through the carrier module;
the intermediate protection circuit breaker is used for receiving the tripping completion signal and sending the tripping completion signal to an external terminal through wireless micropower communication; and the circuit breaker is also used for judging whether the tripping completion signal sent by the final-stage protection circuit breaker is overtime or not according to the tripping signal, and executing tripping operation when the tripping completion signal is not received within the preset receiving time.
Preferably, the leakage signal acquisition module further comprises: the sampling resistor is used for receiving the leakage current acquired by the zero sequence current transformer, so that the leakage current is converted into the leakage voltage signal, the first filter is used for carrying out filtering processing on the leakage voltage signal, and the second filter is used for carrying out filtering processing on the leakage voltage digital signal obtained by the signal conditioning circuit.
Preferably, the device further comprises a power supply module, wherein the input end of the power supply module is connected with the incoming line end side of the loop to be detected, the output end of the power supply module is connected with a voltage stabilizing tube, and the voltage stabilizing tube is respectively connected with the leakage signal acquisition module, the MCU module and the tripping circuit module.
Preferably, the MCU module is further provided with a storage module for storing the leakage current effective value.
Preferably, the tripping circuit module comprises a piezoresistor, a tripper, a silicon controlled rectifier and an optocoupler driving circuit, wherein the piezoresistor is connected with the optocoupler driving circuit, the optocoupler driving circuit is connected with the silicon controlled rectifier, the silicon controlled rectifier is connected with the tripper, and the tripper is respectively connected with the intermediate protection circuit breaker and the final protection circuit breaker.
Preferably, the intermediate protection circuit breaker is further configured to send a protection constant value input in advance by a user to the carrier module;
the carrier module is used for modulating the protection constant value by adopting pseudo-random coding and sending the modulated protection constant value to the final protection circuit breaker;
the final protection circuit breaker is used for demodulating the protection fixed value by adopting pseudo-random coding, and the protection fixed value obtained after demodulation is used as a tripping protection fixed value.
In a second aspect, the present invention further provides a residual current and switch state monitoring protection method, based on the residual current and switch state monitoring protection device, including the following steps:
collecting leakage current of a loop to be detected, thereby generating a leakage voltage signal;
performing analog-to-digital conversion on the leakage voltage signal to obtain a leakage voltage digital signal;
calculating a leakage current effective value according to the leakage voltage digital signal, and generating a tripping signal when the leakage current effective value exceeds a preset leakage current protection action threshold value;
executing tripping operation according to the tripping signal through a final-stage protection circuit breaker, and generating a tripping completion signal to be sent to an intermediate protection circuit breaker after the tripping operation is completed;
transmitting the trip completion signal to an external terminal through wireless micro-power communication through the intermediate protection circuit breaker; judging whether the tripping completion signal sent by the final-stage protection circuit breaker is overtime or not according to the tripping signal, and executing tripping operation when the tripping completion signal is not received within the preset receiving time.
From the above technical scheme, the invention has the following advantages:
the invention provides a residual current and switch state monitoring protection device which is simple in structure and comprises a leakage signal acquisition module, an MCU module, a tripping circuit module and a circuit breaking module, wherein the leakage signal acquisition module is used for acquiring the leakage current of a circuit to be detected, the leakage voltage digital signal is sent to the MCU module, the MCU module calculates the leakage current effective value in real time, if the leakage current effective value exceeds a preset leakage current protection action threshold value, a tripping signal is generated and sent to the tripping circuit module, the tripping circuit module sends the tripping signal to the circuit breaking module, tripping operation is carried out at two levels through an intermediate protection circuit breaker and a final protection circuit breaker, tripping operation is carried out through the final protection circuit breaker, tripping completion signals are sent to the intermediate protection circuit breaker through a carrier module, and tripping completion signals are sent to an external terminal through wireless micropower communication through the intermediate protection circuit breaker, so that a user can know the circuit breaking state in time.
The invention also provides a residual current and switch state monitoring protection method which has the same beneficial effects as the residual current and switch state monitoring protection device, and the residual current and switch state monitoring protection method is not repeated here.
Drawings
Fig. 1 is a schematic structural diagram of a residual current and switch state monitoring protection device according to an embodiment of the present invention;
fig. 2 is a circuit diagram of a leakage signal acquisition module according to an embodiment of the present invention;
fig. 3 is a circuit diagram of a power module according to an embodiment of the present invention;
fig. 4 is a circuit diagram of an MCU module according to an embodiment of the present invention;
fig. 5 is a circuit diagram of a trip circuit module according to an embodiment of the present invention;
fig. 6 is a flowchart of a residual current and switch state monitoring protection method according to an embodiment of the present invention.
Detailed Description
In order to make the present invention better understood by those skilled in the art, the following description will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
For easy understanding, please refer to fig. 1, the present invention provides a residual current and switch state monitoring protection device, which includes: the device comprises a leakage signal acquisition module 100, an MCU module 200, a tripping circuit module 300 and a circuit breaking module 400;
the leakage signal acquisition module 100 comprises a zero sequence current transformer and a signal conditioning circuit, wherein the zero sequence current transformer is used for acquiring leakage current of a circuit to be detected, so that a leakage voltage signal is generated and transmitted to the signal conditioning circuit, and the signal conditioning circuit is used for carrying out analog-to-digital conversion on the leakage voltage signal, so that a leakage voltage digital signal is obtained and is also used for sending the leakage voltage digital signal to the MCU module 200;
the MCU module 200 is configured to calculate a leakage current effective value according to the leakage voltage digital signal, and generate a trip signal and send the trip signal to the trip circuit module 300 when the leakage current effective value exceeds a preset leakage current protection action threshold;
the calculation formula of the leakage current effective value is as follows:
I＝kUC
wherein I represents the effective value of leakage current, k represents the constant of leakage current, U represents the voltage across the capacitor, and C represents the capacitance.
The trip circuit module 300 is configured to receive a trip signal and send the trip signal to the circuit breaking module 400;
the circuit breaking module 400 comprises an intermediate protection circuit breaker 401, a carrier module 402 and a final protection circuit breaker 403, wherein the final protection circuit breaker 403 is connected with the intermediate protection circuit breaker 401 through the carrier module 402;
wherein the final protection circuit breaker 403 may be provided in plurality for use with a plurality of loops.
The final protection circuit breaker 403 is configured to receive the trip signal, and further configured to perform a trip operation according to the trip signal, and generate a trip completion signal after completing the trip operation, and send the trip completion signal to the intermediate protection circuit breaker 401 through the carrier module 402;
the intermediate protection circuit breaker 401 is configured to receive a trip completion signal, and transmit the trip completion signal to an external terminal through wireless micro-power communication; and is further configured to determine whether the trip completion signal transmitted from the final protection circuit breaker 403 is transmitted overtime according to the trip signal, and perform a trip operation when the trip completion signal is not received within a preset reception time.
In one example, the intermediate protection circuit breaker 401 and the final protection circuit breaker 403 each receive a trip signal, and when the trip signal is received, it is considered that a trip operation needs to be performed, wherein, according to a level protection requirement, the action time of the intermediate protection circuit breaker 401 needs to be longer than the action time of the final protection circuit breaker 403, so that the final protection circuit breaker 403 performs the trip operation according to the trip signal, after the trip operation is completed, a trip completion signal is generated and sent to the intermediate protection circuit breaker 401 through the carrier module 402, and the trip completion is confirmed, so that the intermediate protection circuit breaker 401 does not need to perform the trip, and if the trip completion signal is not received within a preset receiving time, the final protection circuit breaker 403 can be considered to reject the trip, and the trip operation is performed.
The embodiment provides a residual current and switch state monitoring protection device, which is simple in structure and comprises a leakage signal acquisition module, an MCU module, a tripping circuit module and a circuit breaking module, wherein the leakage signal acquisition module is used for acquiring the leakage current of a circuit to be detected, the leakage voltage digital signal is sent to the MCU module, the MCU module calculates the leakage current effective value in real time, if the leakage current effective value exceeds a preset leakage current protection action threshold value, a tripping signal is generated and sent to the tripping circuit module, the tripping circuit module sends the tripping signal to the circuit breaking module, tripping operation is carried out through two levels of an intermediate protection circuit breaker and a final protection circuit breaker, tripping operation is carried out through the final protection circuit breaker, tripping completion signals are sent to the intermediate protection circuit breaker through a carrier module, the tripping completion signals are sent to an external terminal through wireless micropower communication through the intermediate protection circuit breaker, so that a user can know the circuit breaking state in time, if the final protection circuit breaker does not receive the tripping completion signals within a preset receiving time, the intermediate protection circuit breaker can be considered to trigger the intermediate protection circuit breaker to execute tripping operation, the tripping operation is improved, and the tripping reliability of the tripping is avoided, and the risk of the occurrence of residual current override tripping is avoided.
In a specific embodiment, the leakage signal acquisition module further includes: the sampling resistor is used for receiving the leakage current acquired by the zero sequence current transformer, so that the leakage current is converted into a leakage voltage signal, the first filter is used for carrying out filtering processing on the leakage voltage signal, and the second filter is used for carrying out filtering processing on a leakage voltage digital signal obtained by the signal conditioning circuit.
As shown in fig. 2, fig. 2 is a schematic circuit diagram of an electric leakage signal acquisition module, when an electric leakage current exists in a circuit to be detected, an electric leakage signal is induced by a zero sequence transformer, a voltage signal is generated by the electric leakage signal through a sampling resistor, the voltage signal is input into a signal conditioning circuit after being formed into a first filter and a protection circuit through a resistor, a capacitor and a TVS tube, the signal conditioning circuit performs analog-to-digital conversion on the voltage signal, so that an electric leakage voltage digital signal is output, and the electric leakage voltage digital signal is input into an MCU module after being subjected to filtering treatment through a second filter formed by a resistor and a capacitor.
In a specific embodiment, the device further comprises a power module, wherein the input end of the power module is connected with the incoming line end side of the loop to be detected, the output end of the power module is connected with a voltage stabilizing tube, and the voltage stabilizing tube is respectively connected with the leakage signal acquisition module, the MCU module and the tripping circuit module.
As shown in fig. 3, fig. 3 illustrates a circuit diagram of a power supply module that provides operating power for the entire device. After the piezoresistor is connected in parallel with two ends of the power taking loop L and the N line, the L line is connected in series with the resistor R2 through the X capacitor and then is rectified. The voltage stabilizing tube D2 is connected with the capacitors C2 and C7 in parallel and is connected to the output end of the rectified circuit.
In a specific embodiment, the MCU module is further provided with a storage module for storing the leakage current effective value. And storing the leakage current effective value through the storage module for local storage.
As shown in fig. 4, fig. 4 illustrates a circuit diagram of an MCU module, where the MCU module includes an MCU chip U3 and separation devices such as resistors and capacitors, and has a wireless micro-power communication function. The MCU chip U3 detects the signal output by the leakage signal acquisition circuit module, calculates the leakage current effective value in real time, and if the leakage current value exceeds the leakage current protection action threshold, the MCU chip U3 sends a tripping signal to trigger the tripping circuit module.
In a specific embodiment, the tripping circuit module comprises a piezoresistor, a tripper, a controllable silicon and an optocoupler driving circuit, wherein the piezoresistor is connected with the optocoupler driving circuit, the optocoupler driving circuit is connected with the controllable silicon, the controllable silicon is connected with the tripper, and the tripper is respectively connected with the intermediate protection circuit breaker and the final protection circuit breaker.
As shown in fig. 5, fig. 5 illustrates a circuit diagram of the trip circuit module, when the MCU module sends a trip signal, the optocoupler driving circuit is triggered to turn on the thyristor VT1, and the line outlet L and the N stages form a current loop with the thyristor via the trip device, so that the circuit breaker is timely opened.
In a specific embodiment, the intermediate protection circuit breaker is further configured to send a protection constant value input in advance by a user to the carrier module;
the carrier module is used for modulating the protection constant value by adopting pseudo-random coding and transmitting the modulated protection constant value to the final protection circuit breaker;
the final protection circuit breaker is used for demodulating the protection fixed value by adopting pseudo-random coding, and the protection fixed value obtained after demodulation is used as a tripping protection fixed value.
Wherein the carrier wave module adopts pseudo-random coding to modulate the protection fixed value, realizes the transmission after the spectrum expansion, and adopts the same coding in the final-stage protection circuit breakerDemodulation and correlation processing are carried out, and a modulation formula is C=Wlog 2 (1+S/N) (where C is channel capacity, W is frequency bandwidth, and S/N is signal to noise ratio).
The foregoing is a detailed description of an embodiment of a residual current and switch state monitoring protection device provided by the present invention, and the following is a detailed description of an embodiment of a residual current and switch state monitoring protection method provided by the present invention.
As shown in fig. 6, the method for monitoring and protecting the residual current and the switch state according to the present invention comprises the following steps:
s1, collecting leakage current of a loop to be detected, so as to generate a leakage voltage signal;
s2, carrying out analog-to-digital conversion on the leakage voltage signal so as to obtain a leakage voltage digital signal;
s3, calculating a leakage current effective value according to the leakage voltage digital signal, and generating a tripping signal when the leakage current effective value exceeds a preset leakage current protection action threshold value;
s4, executing tripping operation according to the tripping signal through the final-stage protection circuit breaker, and generating a tripping completion signal to send to the intermediate protection circuit breaker after the tripping operation is completed;
s5, transmitting a tripping completion signal to an external terminal through wireless micropower communication through an intermediate protection circuit breaker; and judging whether a tripping completion signal sent by the final-stage protection circuit breaker is overtime or not according to the tripping signal, and executing tripping operation when the tripping completion signal is not received within the preset receiving time.
It will be clear to those skilled in the art that, for convenience and brevity of description, reference may be made to the corresponding process in the foregoing apparatus embodiment for the specific working process of the above-described method, which is not described in detail herein.
The embodiment provides a residual current and switch state monitoring protection method, which comprises the steps of collecting leakage current of a circuit to be detected, calculating a leakage current effective value in real time, generating a tripping signal if the leakage current effective value exceeds a preset leakage current protection action threshold value, executing tripping operation through two levels of an intermediate protection circuit breaker and a final protection circuit breaker, executing tripping operation through the final protection circuit breaker, sending a tripping completion signal to the intermediate protection circuit breaker through a carrier module, sending the tripping completion signal to an external terminal through wireless micropower communication through the intermediate protection circuit breaker, enabling a user to know an open circuit state in time, and if the final protection circuit breaker does not receive the tripping completion signal within a preset receiving time, considering that the final protection circuit breaker fails to trip, triggering the intermediate protection circuit breaker to execute tripping operation, improving the tripping reliability of tripping circuit breaking, and avoiding the risk of exceeding-level tripping of the residual current.
In the several embodiments provided by the present invention, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of elements is merely a logical functional division, and there may be additional divisions of actual implementation, e.g., multiple elements or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (4)
1. A residual current and switch state monitoring protection device, comprising: the device comprises a leakage signal acquisition module, an MCU module, a tripping circuit module and a circuit breaking module;
the leakage signal acquisition module comprises a zero sequence current transformer and a signal conditioning circuit, wherein the zero sequence current transformer is used for acquiring leakage current of a loop to be detected so as to generate a leakage voltage signal and transmitting the leakage voltage signal to the signal conditioning circuit, and the signal conditioning circuit is used for carrying out analog-to-digital conversion on the leakage voltage signal so as to obtain a leakage voltage digital signal and also used for sending the leakage voltage digital signal to the MCU module;
the leakage signal acquisition module further comprises: the sampling resistor is used for receiving the leakage current acquired by the zero sequence current transformer so as to convert the leakage current into the leakage voltage signal, the first filter is used for carrying out filtering processing on the leakage voltage signal, and the second filter is used for carrying out filtering processing on the leakage voltage digital signal obtained by the signal conditioning circuit;
the MCU module is used for calculating a leakage current effective value according to the leakage voltage digital signal, and generating a tripping signal and sending the tripping signal to the tripping circuit module when the leakage current effective value exceeds a preset leakage current protection action threshold value;
the tripping circuit module is used for receiving the tripping signal and sending the tripping signal to the circuit breaking module;
the circuit breaker module comprises an intermediate protection circuit breaker, a carrier module and a final protection circuit breaker, wherein the final protection circuit breaker is connected with the intermediate protection circuit breaker through the carrier module;
the final protection circuit breaker is used for receiving the tripping signal, executing tripping operation according to the tripping signal, generating a tripping completion signal after the tripping operation is completed, and sending the tripping completion signal to the intermediate protection circuit breaker through the carrier module;
the intermediate protection circuit breaker is used for receiving the tripping completion signal and sending the tripping completion signal to an external terminal through wireless micropower communication; the tripping device is also used for judging whether the tripping completion signal sent by the final-stage protection circuit breaker is overtime or not according to the tripping signal, and executing tripping operation when the tripping completion signal is not received within the preset receiving time;
the intermediate protection circuit breaker is also used for sending the protection constant value input by a user in advance to the carrier module;
the carrier module is used for modulating the protection constant value by adopting pseudo-random coding and sending the modulated protection constant value to the final protection circuit breaker;
the final protection circuit breaker is used for demodulating the protection fixed value by adopting pseudo-random coding, and taking the protection fixed value obtained after demodulation as a tripping protection fixed value;
the power supply circuit comprises a circuit to be detected, and is characterized by further comprising a power supply module, wherein the input end of the power supply module is connected with the incoming line end side of the circuit to be detected, the output end of the power supply module is connected with a voltage stabilizing tube, and the voltage stabilizing tube is respectively connected with the electric leakage signal acquisition module, the MCU module and the tripping circuit module.
2. The residual current and switching state monitoring and protecting device according to claim 1, wherein the MCU module is further provided with a storage module for storing the leakage current effective value.
3. The residual current and switch state monitoring and protecting device according to claim 1, wherein the tripping circuit module comprises a piezoresistor, a tripper, a silicon controlled rectifier and an optocoupler driving circuit, the piezoresistor is connected with the optocoupler driving circuit, the optocoupler driving circuit is connected with the silicon controlled rectifier, the silicon controlled rectifier is connected with the tripper, and the tripper is respectively connected with the intermediate protection circuit breaker and the final protection circuit breaker.
4. A residual current and switch state monitoring protection method based on the residual current and switch state monitoring protection device as claimed in claim 1, characterized by comprising the following steps:
collecting leakage current of a loop to be detected, thereby generating a leakage voltage signal;
performing analog-to-digital conversion on the leakage voltage signal to obtain a leakage voltage digital signal;
calculating a leakage current effective value according to the leakage voltage digital signal, and generating a tripping signal when the leakage current effective value exceeds a preset leakage current protection action threshold value;
executing tripping operation according to the tripping signal through a final-stage protection circuit breaker, and generating a tripping completion signal to be sent to an intermediate protection circuit breaker after the tripping operation is completed;
transmitting the trip completion signal to an external terminal through wireless micro-power communication through the intermediate protection circuit breaker; judging whether the tripping completion signal sent by the final-stage protection circuit breaker is overtime or not according to the tripping signal, and executing tripping operation when the tripping completion signal is not received within the preset receiving time.
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| CA2783227A1 (en) * | 2011-07-20 | 2013-01-20 | Siemens Industry, Inc. | Circuit breaker trip notification systems and methods |
| CN111555250A (en) * | 2020-05-28 | 2020-08-18 | 天津市中力神盾电子科技有限公司 | Override trip prevention protection method and device |
| CN112531642A (en) * | 2020-12-02 | 2021-03-19 | 真兰电气(上海)有限公司 | Residual current protection circuit and residual current protection device |
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| DE102014201501A1 (en) * | 2014-01-28 | 2015-07-30 | Siemens Aktiengesellschaft | External control of an electromagnetic release |
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| CN111555250A (en) * | 2020-05-28 | 2020-08-18 | 天津市中力神盾电子科技有限公司 | Override trip prevention protection method and device |
| CN112531642A (en) * | 2020-12-02 | 2021-03-19 | 真兰电气(上海)有限公司 | Residual current protection circuit and residual current protection device |
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