CN114566941A - 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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- CN114566941A CN114566941A CN202210213292.1A CN202210213292A CN114566941A CN 114566941 A CN114566941 A CN 114566941A CN 202210213292 A CN202210213292 A CN 202210213292A CN 114566941 A CN114566941 A CN 114566941A
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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
Abstract
The invention relates to the technical field of circuit data monitoring, and discloses a residual current and switch state monitoring protection device and a method, the device comprises a leakage signal acquisition module, an MCU module and a trip circuit module, wherein the trip circuit module executes trip operation through two stages of a middle protective circuit breaker and a last protective circuit breaker, the trip operation is carried out through the final-stage protection circuit breaker, a trip completion signal is sent to the middle protection circuit breaker through the carrier module, the trip completion signal is transmitted to the external terminal through the wireless micro-power communication through the intermediate protection breaker, so that the user can know the open circuit state in time, if the final protection circuit breaker does not receive the trip completion signal within the preset receiving time, the final protection circuit breaker can be considered to reject the trip, therefore, the intermediate protection circuit breaker is triggered to execute tripping operation, so that the reliability of tripping and breaking is improved, and the risk of override tripping caused by residual current is avoided.
Description
Technical Field
The invention relates to the technical field of circuit safety monitoring, in particular to a residual current and switch state monitoring and protecting device and method.
Background
Because the power consumption environment is complicated, the load is various, the quality of the power consumption equipment is uneven, a certain leakage current exists in the leakage circuit breaker of the final-stage protection in the using process, and the leakage current value reaches the threshold value of the leakage circuit breaker of the final-stage protection, so that the leakage risk exists.
Particularly, under the condition that the branches of the middle-level protection leakage circuit breaker at the lower end are more, the leakage current value of the middle-level protection leakage circuit breaker is larger, so that the leakage tripping risk exists in the middle-level protection leakage circuit breaking, and even the override tripping risk exists.
Because the existing residual current protection scheme has the risk of override trip, once a fault occurs, the power failure range is wide, and meanwhile, the difficulty is brought to quick searching and fault removal of maintenance personnel.
Disclosure of Invention
The invention provides a residual current and switch state monitoring and protecting device and method, which solve the technical problem that the residual current has override trip risk.
In view of the above, the first aspect of the present invention provides a residual current and switch state monitoring protection device, including: the circuit breaker comprises a leakage signal acquisition module, an MCU module, a trip circuit module and a circuit breaking module;
the leakage signal acquisition module comprises a zero sequence current transformer and a signal conditioning circuit, 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 transmit the leakage voltage signal to the signal conditioning circuit, and the signal conditioning circuit is used for performing analog-to-digital conversion on the leakage voltage signal so as to obtain a leakage voltage digital signal and 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 is also used for 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 breaking module comprises an intermediate protection circuit breaker, a carrier module and a final protection circuit breaker, and the final protection circuit breaker is connected with the intermediate protection circuit breaker through the carrier module;
the final-stage protection circuit breaker is used for receiving the tripping signal and executing tripping operation according to the tripping signal, and after the tripping operation is finished, a tripping finishing signal is generated and sent to the intermediate protection circuit breaker through the carrier module;
the intermediate protection circuit breaker is used for receiving the trip completion signal and transmitting the trip completion signal to an external terminal through wireless micropower communication; and the trip control module is also used for judging whether the trip completion signal sent by the final-stage protection circuit breaker is sent overtime according to the trip signal, and executing the trip operation when the trip completion signal is not received within the preset receiving time.
Preferably, the leakage signal collecting module further includes: the sampling resistor is used for receiving the leakage current collected by the zero sequence current transformer, so that the leakage current is converted into the leakage voltage signal, the first filter is used for filtering the leakage voltage signal, and the second filter is used for filtering the leakage voltage digital signal obtained by the signal conditioning circuit.
Preferably, the device further comprises a power module, wherein the input end of the power module is connected with the side of the wire inlet end 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 trip circuit module.
Preferably, the MCU module is further provided with a storage module for storing the effective value of the leakage current.
Preferably, the tripping circuit module includes piezo-resistor, release, silicon controlled rectifier, opto-coupler drive circuit, piezo-resistor with opto-coupler drive circuit connects, opto-coupler drive circuit with the silicon controlled rectifier is connected, the silicon controlled rectifier with the release is connected, the release respectively with middle protection circuit breaker with the last protection circuit breaker is connected.
Preferably, the intermediate protection circuit breaker is further configured to send a protection constant value input by a user in advance to the carrier module;
the carrier module is used for modulating the protection fixed value by adopting a pseudo-random code and sending the modulated protection fixed value to the final-stage protection circuit breaker;
and the final-stage protection circuit breaker is used for demodulating the protection fixed value by adopting a pseudo-random code and taking the protection fixed value obtained after demodulation as a trip protection fixed value.
In a second aspect, the present invention further provides a method for monitoring and protecting a residual current and a switch state, where the method for monitoring and protecting a residual current and a switch state is based on the device for monitoring and protecting a residual current and a switch state, and includes the following steps:
collecting leakage current of a loop to be detected, and 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;
the final-stage protection circuit breaker executes tripping operation according to the tripping signal, and generates a tripping completion signal and sends the tripping completion signal to the middle protection circuit breaker after the tripping operation is completed;
the tripping completion signal is sent to an external terminal through the intermediate protection circuit breaker through wireless micro-power communication; and judging whether the trip completion signal sent by the final-stage protection circuit breaker is sent overtime according to the trip signal, and executing the trip operation when the trip completion signal is not received within the preset receiving time.
According to the 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 trip circuit module and a circuit breaking module, wherein the leakage current of a loop to be detected is acquired by the leakage signal acquisition module, a leakage voltage digital signal is transmitted to the MCU module, the MCU module calculates an effective value of leakage current in real time, if the effective value of the leakage current exceeds a preset leakage current protection action threshold value, a trip signal is generated and transmitted to the trip circuit module, the trip circuit module transmits the trip signal to the circuit breaking module, two-level trip operation is executed by an intermediate protection circuit breaker and a final protection circuit breaker, the final protection circuit breaker performs trip operation, the trip completion signal is transmitted to the intermediate protection circuit breaker by a carrier module, and the trip completion signal is transmitted to an external terminal by wireless micro-power communication through the intermediate protection circuit breaker, the user can timely know the state of the circuit break, and if the final-stage protection circuit breaker does not receive a tripping completion signal within preset receiving time, the final-stage protection circuit breaker can be considered to reject tripping, so that the intermediate protection circuit breaker is triggered to execute tripping operation, the reliability of tripping and circuit breaking is improved, and the risk of override tripping caused by residual current is avoided.
The invention also provides a residual current and switch state monitoring and protecting method which has the same beneficial effects with the residual current and switch state monitoring and protecting device provided by the invention, and the redundant description is omitted.
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 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 technical solutions of the present invention better understood, 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.
For easy understanding, referring to fig. 1, the present invention provides a residual current and switch state monitoring protection device, including: the circuit breaker comprises a leakage signal acquisition module 100, an MCU module 200, a trip circuit module 300 and a circuit breaking module 400;
the leakage signal acquisition module 100 includes a zero sequence current transformer and a signal conditioning circuit, the zero sequence current transformer is used for acquiring leakage current of a to-be-detected loop, so as to generate a leakage voltage signal and transmit the leakage voltage signal to the signal conditioning circuit, the signal conditioning circuit is used for performing analog-to-digital conversion on the leakage voltage signal, so as to obtain a leakage voltage digital signal, and is also used for transmitting the leakage voltage digital signal to the MCU module 200;
the MCU module 200 is configured to calculate an effective value of leakage current according to the leakage voltage digital signal, and is further configured to generate a trip signal and send the trip signal to the trip circuit module 300 when the effective value of leakage current exceeds a preset leakage current protection action threshold;
wherein, the calculation formula of the effective value of the leakage current is as follows:
I＝kUC
in the formula, I represents an effective value of a leakage current, k represents a leakage current constant, U represents a voltage across the capacitor, and C represents a capacitance value.
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;
the final protection breaker 403 may be provided in a plurality for use in a plurality of circuits.
The last-stage 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 when the trip operation is completed, generate a trip completion signal and send the trip completion signal to the intermediate protection circuit breaker 401 through the carrier module 402;
the middle protection circuit breaker 401 is used for receiving a trip completion signal and sending the trip completion signal to an external terminal through wireless micro-power communication; and is further configured to determine whether a trip completion signal sent by the final protection circuit breaker 403 is sent overtime according to the trip signal, and perform a trip operation when the trip completion signal is not received within a preset receiving time.
In one example, the intermediate protection circuit breaker 401 and the final protection circuit breaker 403 both receive a trip signal, and when receiving the trip signal, it is considered that a trip operation needs to be performed, wherein according to the hierarchical protection requirement, the action time of the intermediate protection circuit breaker 401 needs to be longer than that of the final protection circuit breaker 403, so that the final protection circuit breaker 403 performs the trip operation according to the trip signal, and after completing the trip operation, a trip completion signal is generated and transmitted to the intermediate protection circuit breaker 401 through the carrier module 402, and it is confirmed that the trip operation is completed, so that the intermediate protection circuit breaker 401 does not need to perform the trip, and if not receiving the trip completion signal within the preset receiving time, it can be considered that the final protection circuit breaker 403 rejects the trip operation, and then the trip operation is performed.
The embodiment provides a residual current and switch state monitoring protection device, which has a simple structure and comprises a leakage signal acquisition module, an MCU module, a trip circuit module and a circuit breaking module, wherein the leakage current of a loop to be detected is acquired by the leakage signal acquisition module, a leakage voltage digital signal is transmitted to the MCU module, the MCU module calculates an effective leakage current value in real time, if the effective leakage current value exceeds a preset leakage current protection action threshold value, a trip signal is generated and transmitted to the trip circuit module, the trip circuit module transmits the trip signal to the circuit breaking module, two-level trip operation is executed by an intermediate protection circuit breaker and a final protection circuit breaker, the final protection circuit breaker performs trip operation, the trip completion signal is transmitted to the intermediate protection circuit breaker by a carrier module, and the trip completion signal is transmitted to an external terminal by wireless micro-power communication through the intermediate protection circuit breaker, the user can timely know the state of the circuit break, and if the final-stage protection circuit breaker does not receive the tripping completion signal within the preset receiving time, the final-stage protection circuit breaker can be considered to reject tripping, so that the intermediate protection circuit breaker is triggered to execute tripping operation, the reliability of tripping and circuit breaking is improved, and the risk of override tripping caused by residual current is avoided.
In a specific embodiment, the electrical leakage signal acquisition module further includes: the sampling resistor is used for receiving leakage current collected by the zero sequence current transformer, so that the leakage current is converted into a leakage voltage signal, the first filter is used for filtering the leakage voltage signal, and the second filter is used for filtering a leakage voltage digital signal obtained by the signal conditioning circuit.
As shown in fig. 2, fig. 2 is a circuit diagram of the leakage signal acquisition module, when there is leakage current in the loop to be detected, a leakage signal is generated by the sensing of the zero sequence transformer, the leakage signal generates a voltage signal by the sampling resistor, the voltage signal passes through the resistor, the capacitor and the TVS tube to form a first filter and a protection circuit, and then is input to the signal conditioning circuit, the signal conditioning circuit performs analog-to-digital conversion on the voltage signal, so as to output a leakage voltage digital signal, and the leakage voltage digital signal is input to the MCU module after being filtered by the second filter formed by the resistor and the capacitor.
In a specific embodiment, 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.
As shown in fig. 3, fig. 3 illustrates a circuit diagram of a power supply module, which provides an operating power supply for the entire device. After the voltage dependent resistors are connected in parallel at the two ends of the power taking loop L and the N line, the L line is rectified after being connected in series with the resistor R2 through the X capacitor. The voltage regulator tube D2 is connected with the capacitors C2 and C7 in parallel and is connected with the output end of the rectified circuit.
In a specific embodiment, the MCU module is further provided with a storage module for storing the effective value of the leakage current. And storing the effective value of the leakage current through the storage module for local storage.
As shown in fig. 4, fig. 4 illustrates a circuit diagram of the MCU module, where the MCU module includes an MCU chip U3 and separate devices such as a resistor and a capacitor, and has a wireless micropower communication function. The MCU chip U3 detects the signal of electric leakage signal acquisition circuit module output, through calculating the leakage current effective value in real time, if the leakage current value exceeds the leakage current protection action threshold value, MCU chip U3 will send the trip signal and trigger the trip circuit module.
In a specific embodiment, the tripping circuit module comprises a piezoresistor, a tripper, a thyristor and an optical coupling driving circuit, wherein the piezoresistor is connected with the optical coupling driving circuit, the optical coupling driving circuit is connected with the thyristor, the thyristor is connected with the tripper, and the tripper is respectively connected with the middle 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 L and N-level outgoing lines form a current loop with the thyristor through the trip, so that the circuit breaker is turned off in time.
In a specific embodiment, the intermediate protection circuit breaker is further configured to send a protection fixed value input by a user in advance to the carrier module;
the carrier module is used for modulating the protection fixed value by adopting pseudo-random coding and sending the modulated protection fixed value to a final-stage protection circuit breaker;
the final-stage 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 the trip protection fixed value.
The carrier module adopts pseudo-random coding to modulate the protection setting value, realizes the spectrum expansion and then transmits, and adopts the same coding to demodulate and carry out related processing at the last-stage protection circuit breaker, wherein the modulation formula is that C is Wlog2(1+ S/N) (where C is channel capacity, W is frequency bandwidth, and S/N is signal-to-noise ratio.
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 on-off state according to the present invention includes the following steps:
s1, collecting leakage current of the loop to be detected, and generating a leakage voltage signal;
s2, performing analog-to-digital conversion on the leakage voltage signal 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 a trip operation through the final-stage protection circuit breaker according to the trip signal, and generating a trip completion signal and sending the trip completion signal to the middle protection circuit breaker after the trip operation is completed;
s5, sending a trip completion signal to an external terminal through wireless micropower communication through the middle protection circuit breaker; and judging whether a trip completion signal sent by the final-stage protection circuit breaker is sent overtime or not according to the trip signal, and executing the trip operation when the trip completion signal is not received within the preset receiving time.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working process of the method described above may refer to the corresponding process in the foregoing device embodiment, and is not described herein again.
The embodiment provides a residual current and switch state monitoring and protecting method, which comprises the steps of calculating a leakage current effective value in real time by collecting the leakage current of a loop to be detected, generating a tripping signal if the leakage current effective value exceeds a preset leakage current protection action threshold value, executing tripping operation through two layers of an intermediate protection circuit breaker and a final protection circuit breaker, performing 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 the intermediate protection circuit breaker through wireless micropower communication, enabling a user to know a circuit breaking state in time, and considering that the final protection circuit breaker rejects when the final protection circuit breaker does not receive the tripping completion signal within a preset receiving time, thereby triggering the intermediate protection circuit breaker to execute the tripping operation to improve the reliability of circuit breaking, and the risk of override trip due to residual current is avoided.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, a division of a unit is merely a logical division, and an actual implementation may have another division, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present 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 solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
1. The utility model provides a residual current and on-off state monitoring protection device which characterized in that includes: the circuit breaker comprises a leakage signal acquisition module, an MCU module, a trip circuit module and a circuit breaking module;
the leakage signal acquisition module comprises a zero sequence current transformer and a signal conditioning circuit, 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 transmit the leakage voltage signal to the signal conditioning circuit, and the signal conditioning circuit is used for performing analog-to-digital conversion on the leakage voltage signal so as to obtain a leakage voltage digital signal and 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 is also used for 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 breaking module comprises an intermediate protection circuit breaker, a carrier module and a final protection circuit breaker, and the final protection circuit breaker is connected with the intermediate protection circuit breaker through the carrier module;
the final-stage protection circuit breaker is used for receiving the tripping signal and executing tripping operation according to the tripping signal, and after the tripping operation is finished, a tripping finishing signal is generated and sent to the intermediate protection circuit breaker through the carrier module;
the intermediate protection circuit breaker is used for receiving the trip completion signal and transmitting the trip completion signal to an external terminal through wireless micropower communication; and the trip control module is also used for judging whether the trip completion signal sent by the final-stage protection circuit breaker is sent overtime according to the trip signal, and executing the trip operation when the trip completion signal is not received within the preset receiving time.
2. The residual current and switch state monitoring protection device according to claim 1, wherein the leakage signal collection module further comprises: the sampling resistor is used for receiving the leakage current collected by the zero sequence current transformer, so that the leakage current is converted into the leakage voltage signal, the first filter is used for filtering the leakage voltage signal, and the second filter is used for filtering the leakage voltage digital signal obtained by the signal conditioning circuit.
3. The residual current and switch state monitoring protection device according to claim 1, further comprising a power module, wherein an input end of the power module is connected to a wire inlet end side of the circuit to be detected, an output end of the power module is connected to a voltage regulator tube, and the voltage regulator tube is respectively connected to the leakage signal acquisition module, the MCU module and the trip circuit module.
4. The residual current and switch state monitoring protection device according to claim 1, wherein the MCU module is further provided with a storage module for storing the effective value of the leakage current.
5. The residual current and switch state monitoring protection device according to claim 1, wherein the trip circuit module comprises a voltage dependent resistor, a trip, a thyristor, and an optical coupling driving circuit, the voltage dependent resistor is connected with the optical coupling driving circuit, the optical coupling driving circuit is connected with the thyristor, the thyristor is connected with the trip, and the trip is respectively connected with the intermediate protection circuit breaker and the final protection circuit breaker.
6. The residual current and switch state monitoring protection device according to claim 1, wherein the intermediate protection circuit breaker is further configured to send a protection setting value input by a user in advance to the carrier module;
the carrier module is used for modulating the protection fixed value by adopting a pseudo-random code and sending the modulated protection fixed value to the final-stage protection circuit breaker;
and the final-stage protection circuit breaker is used for demodulating the protection fixed value by adopting a pseudo-random code and taking the protection fixed value obtained after demodulation as a trip protection fixed value.
7. A residual current and switch state monitoring protection method is based on the residual current and switch state monitoring protection device of claim 1, and is characterized by comprising the following steps:
collecting leakage current of a loop to be detected, and 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;
the final-stage protection circuit breaker executes tripping operation according to the tripping signal, and generates a tripping completion signal to be sent to the middle protection circuit breaker after the tripping operation is completed;
the tripping completion signal is sent to an external terminal through the intermediate protection circuit breaker through wireless micro-power communication; and judging whether the trip completion signal sent by the final-stage protection circuit breaker is sent overtime according to the trip signal, and executing the trip operation when the trip completion signal is not received within the preset receiving time.
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| CN114566941B (en) | 2023-06-27 |
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