High-voltage live display locking device for monitoring leakage current

Abstract

The utility model discloses a high-voltage live display locking device for monitoring leakage current, which belongs to the technical field of lightning arrester monitoring and comprises an electric leakage detection module, a signal processing module, a master control module, an alarm module, a locking module and a power supply module. The electric leakage detection module is used for collecting a leakage current signal and transmitting the leakage current signal to the signal processing module; the signal processing module converts the leakage current signal into a voltage signal and transmits the voltage signal to the main control module; the main control module responds to the voltage signal to generate an alarm signal and a blocking signal; the alarm module responds to the alarm signal to execute an alarm action; the locking module responds to the locking signal to execute a locking action; the power supply module provides working voltage for the electric leakage detection module, the signal processing module, the main control module, the alarm module and the locking module. According to the utility model, the problem of low safety caused by the fact that the electrification condition of the lightning arrester corresponding to other electrical equipment is not considered in the prior art is solved.

Description

Technical Field

[0001] This utility model relates to the field of surge arrester monitoring technology, specifically a high-voltage live display and interlocking device for monitoring leakage current. Background Technology

[0002] With the long-term operation of power systems, accidents caused by various misoperations occur frequently. To address this, existing technologies have specifically installed corresponding high-voltage live-line monitoring devices for electrical equipment such as high-voltage switchgear, handcart-type high-voltage switchgear, and ring main units to monitor the energized status of the corresponding electrical equipment, provide warnings, and prevent accidents. However, the alarm methods of these high-voltage live-line monitoring devices are mostly light alarms, which are limited by issues such as LED light aging and weak daytime light, resulting in poor warning effects. Furthermore, these high-voltage live-line monitoring devices are limited by the installation location of the corresponding surge arresters and usually cannot detect whether the transformer equipment downstream of the corresponding circuit breaker is energized, leading to safety hazards during operation and maintenance. In addition, the installation of these high-voltage live-line monitoring devices requires corresponding modifications to the surge arrester leads; otherwise, the accuracy of their detection will be affected.

[0003] Chinese patent, publication number CN221667902U, publication date: September 6, 2024, discloses a surge arrester monitoring and lightning strike counting device, including: a leakage current detection module for detecting leakage current or voltage signals and outputting leakage current signals to a main control module; a lightning strike counting detection module for detecting lightning strike information, acquiring lightning strike signals, and outputting them to the main control module; and a main control module for receiving leakage current signals and lightning strike signals and outputting them to a host computer; the leakage current detection module is connected to the main control module, and the lightning strike counting detection module is also connected to the main control module. However, this utility model does not consider the energization status of other electrical equipment on the high-voltage line where the surge arrester is located, resulting in low safety. Utility Model Content

[0004] The purpose of this invention is to address the problem of low safety in existing technologies that do not consider the energization of other electrical equipment on the high-voltage line where the surge arrester is located. This invention proposes a high-voltage energized display and interlocking device for monitoring leakage current. A signal processing module converts the leakage current signal collected by the leakage current detection module into a voltage signal. The main control module responds to the voltage signal by generating an alarm signal and an interlocking signal. The alarm module executes an alarm action in response to the alarm signal, and the interlocking module executes an interlocking action in response to the interlocking signal. This significantly improves the accuracy of leakage current detection. Furthermore, after the interlocking module successfully executes the interlocking action, it electrically isolates the monitored surge arrester and its corresponding electrical equipment, preventing accidental energization of the surge arrester and its corresponding electrical equipment, thus effectively improving safety.

[0005] In a first aspect, one technical solution provided in this utility model embodiment is a high-voltage live display interlocking device for monitoring leakage current, comprising: a leakage current detection module, a signal processing module, a main control module, an alarm module, an interlocking module, and a power supply module;

[0006] The leakage current detection module is used to collect leakage current signals and transmit the leakage current signals to the signal processing module;

[0007] The signal processing module converts the leakage current signal into a voltage signal and transmits the voltage signal to the main control module;

[0008] The main control module generates alarm and interlock signals in response to voltage signals;

[0009] The alarm module responds to the alarm signal and performs an alarm action;

[0010] The locking module performs a locking action in response to a locking signal;

[0011] The power supply module provides operating voltage for the leakage detection module, signal processing module, main control module, alarm module, and interlocking module.

[0012] In this scheme, since the leakage current signal itself is weak and is easily affected by changes in line impedance and electromagnetic interference during long-distance transmission, the signal processing module processes the leakage current signal collected by the leakage current detection module, converting it into a voltage signal, effectively improving the accuracy and integrity of the collected signal. When the signal processing module transmits the voltage signal to the main control module, the main control module generates an alarm signal and a blocking signal based on the safety threshold, alarm threshold, and the voltage signal itself. Specifically, if the voltage signal is greater than the safety threshold, the main control module controls the alarm module to power on and display the corresponding surge arrester and its high-voltage line. The main control module controls the alarm signal to power on and prevents the interlocking module from powering on, meaning the interlocking module does not perform the interlocking action. If the voltage signal exceeds the safety threshold and the alarm threshold, the main control module controls the alarm signal to power on and display the corresponding surge arrester fault, and also controls the interlocking module to power on, meaning the interlocking module performs the interlocking action. It should be noted that the alarm module can provide graded warnings for the real-time status of the surge arrester, realizing both live and fault display. By having the alarm module perform the alarm action and the interlocking module perform the interlocking action, the corresponding maintenance personnel are effectively alerted. It can also electrically isolate the monitored surge arrester and its corresponding electrical equipment, preventing accidental operation from causing the surge arrester and its corresponding electrical equipment to become energized, thus effectively improving safety.

[0013] Preferably, the leakage current detection module includes: a leakage current sensor;

[0014] The acquisition terminal of the leakage current sensor is used to acquire leakage current signals, and the output terminal of the leakage current sensor is electrically connected to the signal processing module.

[0015] Preferably, the leakage current sensor is a permalloy open sensor.

[0016] In this solution, a permalloy open sensor is used as the leakage current detection module. When collecting the leakage current signal of the surge arrester, it can be directly clamped into the grounding lead of the surge arrester, avoiding the complicated process of modifying the grounding lead and the chain reaction of powering off the surge arrester, effectively improving the efficiency and real-time performance of leakage current signal sampling.

[0017] Preferably, the signal processing module includes: a voltage conversion circuit, a filter circuit, an amplifier circuit, and a conditioning circuit; the input terminal of the voltage conversion circuit is electrically connected to the leakage current detection module, the output terminal of the voltage conversion circuit is electrically connected to the input terminal of the filter circuit, the output terminal of the filter circuit is electrically connected to the input terminal of the amplifier circuit, the output terminal of the amplifier circuit is electrically connected to the first input terminal of the conditioning circuit, and the output terminal of the conditioning circuit is electrically connected to the main control module.

[0018] Preferably, the conditioning circuit is further provided with a second input terminal for obtaining the reference voltage of the corresponding type of surge arrester.

[0019] In this scheme, when the leakage current signal is transmitted to the signal processing module, the voltage conversion circuit first converts the leakage current signal into a corresponding voltage signal. Then, the filtering circuit filters the voltage signal to remove high-frequency noise and other interference information. The filtered voltage signal is then transmitted to the amplification circuit, which amplifies the input voltage signal to make it easier to detect and judge. Subsequently, the conditioning circuit superimposes the amplified voltage signal with the reference voltage of the corresponding surge arrester, raising the zero point of the corresponding voltage signal. This effectively avoids nonlinear distortion of the voltage signal and enhances its anti-interference capability. Alarm thresholds and safety thresholds can also be set based on the zero point, simplifying the judgment logic of the abnormal state of the corresponding surge arrester. It should be noted that the surge arrester itself does not limit the reference voltage. Therefore, the reference voltage of the corresponding surge arrester is actually implemented through a correspondingly designed reference voltage circuit.

[0020] Preferably, the main control module includes: a microcontroller and a latching drive circuit;

[0021] The input terminal of the microcontroller is electrically connected to the signal processing module, the first output terminal of the microcontroller is electrically connected to the alarm module, the second output terminal of the microcontroller is electrically connected to the input terminal of the interlocking drive circuit, and the output terminal of the interlocking drive circuit is electrically connected to the interlocking module.

[0022] Preferably, the latching drive circuit includes: a coil relay, a transistor, a current-limiting resistor, and a pull-down resistor;

[0023] One end of the current-limiting resistor is electrically connected to the microcontroller, the other end of the current-limiting resistor is electrically connected to the base of the transistor, one end of the pull-down resistor is electrically connected to the base of the transistor, the other end of the pull-down resistor is grounded, the emitter of the transistor is grounded, the collector of the transistor is electrically connected to the controlled terminal of the coil relay, and the control terminal of the coil relay is electrically connected to the interlocking module.

[0024] In this solution, the converter inside the microcontroller collects, stores, and calculates the signal uploaded by the signal processing module. Specifically, when the collected signal exceeds the safety threshold, the microcontroller issues a command to close the normally open contact of the coil relay and sends a first alarm signal to the alarm module, realizing a live warning for the surge arrester and its high-voltage line. However, the signal is still within the normal range, and the corresponding surge arrester is not abnormal. When the collected signal exceeds both the safety threshold and the alarm threshold, the surge arrester is abnormal and needs to be repaired. In this case, the microcontroller sends a second alarm signal to the alarm module, realizing a fault warning for the surge arrester. Maintenance personnel can quickly locate the surge arrester with abnormal working status based on the fault warning and the live warning, and take corresponding power-off actions. At this time, the leakage current signal of the surge arrester will be reduced or even eliminated. If the signal collected is less than or equal to the safety threshold, the microcontroller sends a command to close the normally closed contacts of the coil relay, interlocking and disconnecting the surge arrester and the electrical equipment on the high-voltage line, thus achieving electrical isolation. Similarly, when maintenance personnel complete the inspection and power on the surge arrester, the corresponding collected signal appears, and the microcontroller sends a third alarm signal to the alarm module. In addition, if the coil relay is directly electrically connected to the microcontroller, it may be limited by the characteristics of the coil relay itself, resulting in problems such as arcing and contact welding. Therefore, a transistor is installed before the input terminal of the coil relay to control the input current signal, preventing overcurrent or high current from causing contact welding of the coil relay. At the same time, the transistor can also buffer the control signal sent by the microcontroller, preventing the back electromotive force of the coil relay from impacting the microcontroller and causing damage.

[0025] Preferably, the alarm module includes at least one or more combinations of indicator lights and buzzers.

[0026] In this solution, since the main control module will issue a first alarm signal, a second alarm signal, and a third alarm signal respectively for different states of the surge arrester, and a single alarm message can easily cause alarm fatigue among the corresponding maintenance personnel, thus causing them to ignore the alarm message, visual warnings are provided based on indicator lights and audible warnings are provided based on buzzers. Moreover, the indicator lights and buzzers can issue alarm messages in combination according to the alarm signals issued by the main control module. Specifically, when the alarm module receives the first alarm message, the corresponding indicator light is lit, indicating that the corresponding surge arrester and its high-voltage line are energized. When the alarm module receives the second alarm message, the buzzer is activated on the basis that the corresponding energized indicator light for the surge arrester and its high-voltage line is already lit, realizing a combined sound and light alarm. When the alarm module receives the third alarm message, the buzzer is activated to warn that the corresponding surge arrester and its high-voltage line are energized, effectively ensuring the effectiveness of the alarm module's corresponding alarm actions. In addition, the lights of the indicator lights can also change color according to different alarm messages to stimulate the visual senses of the staff.

[0027] Preferably, the interlocking module includes: an electromagnetic lock circuit and a microcomputer anti-misoperation circuit;

[0028] The controlled terminals of the electromagnetic lock circuit and the microcomputer anti-misoperation circuit are electrically connected to the main control module.

[0029] Preferably, the electromagnetic lock circuit is further provided with an electromagnetic lock circuit interface, and the microcomputer anti-misoperation circuit is further provided with a microcomputer anti-misoperation computer key interface.

[0030] The beneficial effects of this utility model are:

[0031] This application uses a permalloy open sensor as a leakage current detection module. When collecting leakage current signals from surge arresters, it can be directly clamped into the grounding lead of the surge arrester, avoiding the complex procedures of modifying the grounding lead and the chain reaction of power outages to the surge arrester, effectively improving the efficiency and real-time performance of leakage current signal sampling. Since the leakage current signal itself is weak and easily affected by line impedance changes and electromagnetic interference during long-distance transmission, when the leakage current signal is transmitted to the signal processing module, the voltage conversion circuit first converts the leakage current signal into a corresponding voltage signal. Then, the filtering circuit filters the voltage signal, removing high-frequency noise and other interference information, and transmits the filtered voltage signal to the amplification circuit. The amplification circuit amplifies the input voltage signal, making it easier to detect and judge. Subsequently, the conditioning circuit superimposes the amplified voltage signal with the reference voltage of the corresponding surge arrester, raising the zero point of the corresponding voltage signal, effectively avoiding nonlinear distortion of the voltage signal and enhancing the voltage signal. The system has strong anti-interference capabilities and can set alarm thresholds and safety thresholds based on the zero point, simplifying the judgment logic for abnormal states of the corresponding surge arresters. The main control module judges the working state of the corresponding surge arrester based on the alarm threshold, safety threshold, and voltage signal. Specifically, if the voltage signal is greater than the safety threshold, the main control module controls the alarm module to power on and display that the corresponding surge arrester and its high-voltage line are energized, and controls the interlocking module not to power on, that is, the interlocking module does not perform the interlocking action. If the voltage signal is greater than the safety threshold and the voltage signal is greater than the alarm threshold, the main control module controls the alarm signal to power on and display that the corresponding surge arrester is faulty, and controls the interlocking module to power on, that is, the interlocking module performs the interlocking action. This accurately judges whether a leakage current event has occurred in the surge arrester, effectively improving the accuracy of leakage current detection. By executing the alarm action through the alarm module and the interlocking action through the interlocking module, the corresponding maintenance personnel are effectively alerted. It can also electrically isolate the monitored surge arrester and its corresponding electrical equipment, preventing accidental operation from causing the surge arrester and its corresponding electrical equipment to become energized, effectively improving safety. Attached Figure Description

[0032] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings. The drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings.

[0033] Figure 1 This is a schematic diagram of the structure of a high-voltage live display interlocking device for monitoring leakage current according to the present invention;

[0034] Figure 2 This is a schematic diagram of the microcontroller structure;

[0035] Figure 3 This is a schematic diagram of the voltage conversion circuit.

[0036] Figure 4 This is a schematic diagram of the filter circuit.

[0037] Figure 5 This is a schematic diagram of the amplifier circuit.

[0038] Figure 6 This is a schematic diagram of the conditioning circuit.

[0039] Figure 7 This is a schematic diagram of the lockout drive circuit.

[0040] Figure 8 This is a schematic diagram of the reference voltage circuit.

[0041] Figure label:

[0042] 1. Leakage detection module; 11. Permalloy open sensor; 2. Signal processing module; 21. Voltage conversion circuit; 22. Filtering circuit; 23. Amplification circuit; 24. Conditioning circuit; 3. Locking module; 31. Electromagnetic lock circuit; 32. Microcomputer anti-misoperation circuit; 4. Main control module; 41. Microcontroller; 42. Locking drive circuit; 5. Alarm module; 51. Buzzer; 52. Indicator light; 6. Power supply module; 61. Battery. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only one preferred embodiment of this utility model and are only used to explain this utility model. They do not limit the scope of protection of this utility model. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0044] Before discussing the exemplary embodiments in more detail, it should be mentioned that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although the flowcharts describe the operations (or steps) as sequential processes, many of the operations (or steps) can be performed in parallel, concurrently, or simultaneously. Furthermore, the order of the operations can be rearranged. The process can be terminated when its operation is completed, but it may also have additional steps not included in the figures; the process may correspond to a method, function, procedure, subroutine, subroutine, etc.

[0045] Example 1:

[0046] like Figure 1As shown, this embodiment provides a high-voltage live display interlocking device for monitoring leakage current, including: leakage current detection module 1, signal processing module 2, main control module 4, alarm module 5, interlocking module 3 and power supply module 6;

[0047] The leakage current detection module 1 is used to collect leakage current signals and transmit the leakage current signals to the signal processing module 2;

[0048] The signal processing module 2 converts the leakage current signal into a voltage signal and transmits the voltage signal to the main control module 4;

[0049] The main control module 4 generates alarm and interlock signals in response to voltage signals;

[0050] The alarm module 5 executes an alarm action in response to the alarm signal;

[0051] The locking module 3 performs a locking action in response to the locking signal;

[0052] The power supply module 6 provides operating voltage for the leakage current detection module 1, signal processing module 2, main control module 4, alarm module 5, and interlocking module 3.

[0053] In this embodiment, since the leakage current signal itself is weak and is easily affected by changes in line impedance and electromagnetic interference during long-distance transmission, the signal processing module 2 processes the leakage current signal collected by the leakage current detection module 1 and converts it into a voltage signal, effectively improving the accuracy and integrity of the collected signal. When the signal processing module 2 transmits the voltage signal to the main control module 4, the main control module 4 generates an alarm signal and a blocking signal based on the safety threshold, alarm threshold, and the voltage signal itself. The alarm threshold is greater than the safety threshold. Specifically, if the voltage signal is greater than the safety threshold, the main control module 4 controls the alarm module 5 to power on and display the corresponding surge arrester and its high-voltage line as energized, and controls the blocking module 3 to not power on, that is, the blocking module 3 does not perform the blocking action. If the voltage signal is greater than the safety threshold and the voltage signal is greater than the alarm threshold, the main control module 4 controls the alarm signal to power on and display the corresponding surge arrester fault, and controls the interlocking module 3 to power on, that is, the interlocking module 3 executes the interlocking action. It should be noted that the alarm module 5 can provide graded warnings for the real-time status of the surge arrester, realizing live display and fault display; by the alarm module 5 executing the alarm action and the interlocking module 3 executing the interlocking action, the corresponding maintenance personnel are effectively alerted, and the monitored surge arrester and its corresponding electrical equipment are electrically isolated to prevent the surge arrester and its corresponding electrical equipment from being energized due to misoperation, thus effectively improving safety. The power supply module 6 includes a battery 61, which is a high-capacity battery 61, which can be a single battery 61 or a combination of multiple batteries 61.

[0054] In one embodiment, the leakage current detection module 1 includes: a leakage current sensor;

[0055] The acquisition end of the leakage current sensor is used to acquire leakage current signals, and the output end of the leakage current sensor is electrically connected to the signal processing module 2.

[0056] In one embodiment, the leakage current sensor is specifically a permalloy open sensor 11.

[0057] In this embodiment, a permalloy open sensor 11 is used as the leakage current detection module 1. When collecting the leakage current signal of the surge arrester, it can be directly clamped into the grounding lead of the surge arrester, avoiding the complicated process of modifying the grounding lead and the chain reaction of powering off the surge arrester, effectively improving the efficiency and real-time performance of leakage current signal sampling.

[0058] In one embodiment, the signal processing module 2 includes: a voltage conversion circuit 21, a filter circuit 22, an amplifier circuit 23, and a conditioning circuit 24;

[0059] The input terminal of the voltage conversion circuit 21 is electrically connected to the leakage current detection module 1, the output terminal of the voltage conversion circuit 21 is electrically connected to the input terminal of the filter circuit 22, the output terminal of the filter circuit 22 is electrically connected to the input terminal of the amplifier circuit 23, the output terminal of the amplifier circuit 23 is electrically connected to the first input terminal of the conditioning circuit 24, and the output terminal of the conditioning circuit 24 is electrically connected to the main control module 4.

[0060] In one embodiment, the conditioning circuit 24 is further provided with a second input terminal for obtaining the reference voltage of the corresponding type of surge arrester.

[0061] In this embodiment, when the leakage current signal is transmitted to the signal processing module 2, such as Figure 3 The voltage conversion circuit 21 shown converts the leakage current signal into a corresponding voltage signal. The Cin+ terminal of the voltage conversion circuit 21 is electrically connected to the leakage current detection module 1, and the Cin- terminal of the voltage conversion circuit 21 is electrically connected to the input terminal of the filter circuit 22. Then, as... Figure 4 The filter circuit 22 shown filters the voltage signal, removing high-frequency noise and other interference. The +IN terminal of the filter circuit 22 is electrically connected to the voltage conversion circuit 21, and the OUT terminal of the filter circuit 22 is electrically connected to the amplifier circuit 23, transmitting the filtered voltage signal to the amplifier circuit 23. Figure 5 The amplifier circuit 23 shown amplifies the input voltage signal, making it easier to detect and judge. The RF+ terminal of the amplifier circuit 23 is electrically connected to the filter circuit 22, and the AF- terminal of the amplifier circuit 23 is electrically connected to the conditioning circuit 24. Then, as... Figure 6 The conditioning circuit 24 shown superimposes the amplified voltage signal with the reference voltage of the corresponding surge arrester, raising the zero point of the corresponding voltage signal. This effectively avoids nonlinear distortion of the voltage signal, enhances its anti-interference capability, and allows for setting alarm and safety thresholds based on the zero point, simplifying the judgment logic for abnormal states of the corresponding surge arrester. The first input terminal S+ of the conditioning circuit 24 is electrically connected to the amplification circuit 23, and the Sig_A terminal of the conditioning circuit 24 is electrically connected to the main control module 4. It should be noted that the surge arrester itself does not limit the reference voltage; therefore, the reference voltage of the corresponding surge arrester is essentially obtained through... Figure 8 The reference voltage circuit shown is implemented in which the OUT terminal of the reference voltage circuit is electrically connected to the second input terminal of the conditioning circuit 24.

[0062] In one embodiment, the main control module 4 includes: a microcontroller 41 and a latching drive circuit 42;

[0063] The input terminal of the microcontroller 41 is electrically connected to the signal processing module 2, the first output terminal of the microcontroller 41 is electrically connected to the alarm module 5, the second output terminal of the microcontroller 41 is electrically connected to the input terminal of the interlocking drive circuit 42, and the output terminal of the interlocking drive circuit 42 is electrically connected to the interlocking module 3.

[0064] In one embodiment, the latching drive circuit 42 includes: a coil relay 3-1HDS-L2, a transistor, a current-limiting resistor, and a pull-down resistor;

[0065] One end of the current-limiting resistor is electrically connected to the microcontroller 41, the other end of the current-limiting resistor is electrically connected to the base of the transistor, one end of the pull-down resistor is electrically connected to the base of the transistor, the other end of the pull-down resistor is grounded, the emitter of the transistor is grounded, the collector of the transistor is electrically connected to the controlled terminal of the coil relay, and the control terminal of the coil relay is electrically connected to the interlocking module 3.

[0066] In this embodiment, as Figure 2 The microcontroller 41 shown is specifically an STM32F103R8 chip. Its internal converter acquires, stores, and calculates the signal uploaded from the signal processing module 2. Pin PA7 of the microcontroller 41 is electrically connected to the conditioning circuit 24, and pin PB7 of the microcontroller 41 is connected to... Figure 7 In the latch-up drive circuit 42 shown, one end of the current-limiting resistor R4 corresponding to the first transistor Q1 is electrically connected, and the pull-down resistor corresponding to the first transistor Q1 is... Figure 7 The resistor R5 in the circuit is connected to one end of the current-limiting resistor R6 corresponding to the second transistor Q2 in the latch-up drive circuit 42. The pull-down resistor corresponding to the second transistor Q2 is... Figure 7 Specifically, regarding resistor R9, when the acquired signal exceeds the safety threshold, the microcontroller 41 issues a command to close the normally open contact of the coil relay and sends a first alarm signal to the alarm module 5, thus providing a live warning for the surge arrester and its high-voltage line. However, the signal remains within the normal range, and the corresponding surge arrester is not malfunctioning. When the acquired signal exceeds both the safety threshold and the alarm threshold, the surge arrester malfunctions and requires maintenance. In this case, the microcontroller 41 sends a second alarm signal to the alarm module 5, providing a fault warning for the surge arrester. Maintenance personnel can quickly locate the surge arrester with abnormal operating status based on the fault warning and the live warning, and take corresponding power-off actions. At this time, the leakage current signal corresponding to the surge arrester will decrease or even disappear, and the acquired signal will then be less than or equal to the safety threshold. The microcontroller 41 issues a command to close the normally closed contacts of the coil relay, thereby interlocking and disconnecting the surge arrester and the electrical equipment on the high-voltage line, achieving electrical isolation. Similarly, when maintenance personnel complete the inspection and power on the surge arrester, a corresponding acquisition signal appears, and the microcontroller 41 sends a third alarm signal to the alarm module 5. In addition, if the coil relay is directly electrically connected to the microcontroller 41, it may be limited by the characteristics of the coil relay itself, resulting in problems such as arcing and contact welding. Therefore, a transistor is installed before the input terminal of the coil relay to control the input current signal, preventing overcurrent or high current from causing contact welding of the coil relay. At the same time, the transistor can also buffer the control signal issued by the microcontroller to prevent the back electromotive force of the coil relay from impacting the microcontroller 41 and causing damage.

[0067] In one embodiment, the alarm module 5 includes at least one or more combinations of an indicator light 52 and a buzzer 51.

[0068] In this embodiment, since the main control module 4 will issue a first alarm signal, a second alarm signal, and a third alarm signal respectively for different states of the surge arrester, and a single alarm message can easily cause alarm fatigue among the corresponding maintenance personnel, thus causing them to ignore the alarm message, a visual warning is provided based on the indicator light 52 and an audible warning is provided based on the buzzer 51. The indicator light 52 and the buzzer 51 can issue alarm messages in combination according to the alarm signals issued by the main control module 4. Specifically, when the alarm module 5 receives the first alarm message, the corresponding indicator light 52 is lit, indicating that the corresponding surge arrester and its high-voltage line are energized. When the alarm module 5 receives the second alarm message, the buzzer 51 is activated on the basis that the corresponding energized indicator light 52 of the surge arrester and its high-voltage line is already lit, realizing a combined sound and light alarm. When the alarm module 5 receives the third alarm message, the buzzer 51 is activated to warn that the corresponding surge arrester and its high-voltage line are energized, effectively ensuring the effectiveness of the alarm actions of the alarm module 5. In addition, the light of the indicator light 52 can also change color according to different alarm messages to stimulate the visual senses of the staff.

[0069] In one embodiment, the locking module 3 includes: an electromagnetic lock circuit 31 and a microcomputer anti-misoperation circuit 32;

[0070] The controlled terminals of the electromagnetic lock circuit 31 and the microcomputer anti-misoperation circuit 32 are electrically connected to the main control module 4, respectively.

[0071] In this embodiment, when the normally open contact of the coil relay in the main control module 4 is closed, the electromagnetic lock circuit 31 and the microcomputer anti-misoperation circuit 32 perform a locking action, enabling the corresponding surge arrester and its high-voltage line to operate normally under power. When the normally closed contact of the coil relay in the main control module 4 is closed, the electromagnetic lock circuit 31 and the microcomputer anti-misoperation circuit 32 perform an unlocking action, isolating the corresponding surge arrester and its high-voltage line from the corresponding power system, thereby achieving electrical isolation between the surge arrester and its high-voltage line.

[0072] In one embodiment, the electromagnetic lock circuit 31 is further provided with an electromagnetic lock interface, and the microcomputer anti-misoperation circuit 32 is further provided with a microcomputer anti-misoperation computer key interface.

[0073] In this embodiment, the electromagnetic lock interface allows the electromagnetic lock circuit 31 to connect with devices such as knife switches and mesh gates equipped with electromagnetic locks, thereby controlling the connection relationship between the knife switches, mesh gates, and other devices and the corresponding surge arresters. Similarly, the microcomputer anti-misoperation computer key interface allows the microcomputer anti-misoperation circuit 32 to connect with devices such as knife switches and mesh gates equipped with electromagnetic locks, thereby controlling the connection relationship between the knife switches, mesh gates, and other devices and the corresponding surge arresters, thus preventing accidental closing of the grounding switch and accidental entry into a live compartment.

[0074] This embodiment has at least the following substantial effects:

[0075] This embodiment uses a permalloy open sensor 11 as the leakage current detection module 1. When collecting the leakage current signal of the surge arrester, it can be directly clamped into the grounding lead of the surge arrester, avoiding the complex process of modifying the grounding lead and the chain reaction of powering off the surge arrester, effectively improving the efficiency and real-time performance of leakage current signal sampling. Since the leakage current signal itself has weak properties and is easily affected by changes in line impedance and electromagnetic interference during long-distance transmission, when the leakage current signal is transmitted to the signal processing module 2, the voltage conversion circuit 21 first converts the leakage current signal into a corresponding voltage signal. Then, the filtering circuit 22 filters the voltage signal to remove high-frequency noise and other interference information, and transmits the filtered voltage signal to the amplification circuit 23. The amplification circuit 23 amplifies the input voltage signal, making the voltage signal easier to detect and judge. Subsequently, the conditioning circuit 24 superimposes the amplified voltage signal with the reference voltage of the corresponding surge arrester, raising the zero point of the corresponding voltage signal, effectively avoiding nonlinear distortion of the voltage signal and enhancing the voltage signal. The anti-interference capability of the voltage signal can also be improved by setting alarm thresholds and safety thresholds based on the zero point, simplifying the judgment logic of the abnormal state of the corresponding surge arrester. The main control module 4 judges the working state of the corresponding surge arrester based on the alarm threshold, safety threshold and voltage signal. Specifically, if the voltage signal is greater than the safety threshold, the main control module 4 controls the alarm module 5 to power on and display the corresponding surge arrester and its high-voltage line to be energized, and controls the interlocking module 3 to not power on, that is, the interlocking module 3 does not perform the interlocking action. If the voltage signal is greater than the safety threshold and the voltage signal is greater than the alarm threshold, the main control module 4 controls the alarm signal to power on and display the corresponding surge arrester fault, and controls the interlocking module 3 to power on, that is, the interlocking module 3 performs the interlocking action, accurately judging whether the surge arrester has a leakage current event, effectively improving the accuracy of leakage current detection, and effectively warning the corresponding maintenance personnel by the alarm module 5 performing the alarm action and the interlocking module 3 performing the interlocking action. It can also electrically isolate the corresponding surge arrester and its corresponding electrical equipment, prevent the surge arrester and its corresponding electrical equipment from being energized due to misoperation, and effectively improve safety.

[0076] The above-described specific embodiments are preferred embodiments of this utility model, and are not intended to limit the specific scope of this utility model. The scope of this utility model includes, but is not limited to, these specific embodiments. All equivalent changes made in accordance with the shape, structure, and method of this utility model are within the protection scope of this utility model.

Claims

1. A high voltage live display lockout device for monitoring a leakage current, characterised in that, It includes: leakage current detection module, signal processing module, main control module, alarm module, interlocking module and power supply module; The leakage current detection module is used to collect leakage current signals and transmit the leakage current signals to the signal processing module; The signal processing module converts the leakage current signal into a voltage signal and transmits the voltage signal to the main control module; The main control module generates alarm and interlock signals in response to voltage signals; The alarm module responds to the alarm signal and performs an alarm action; The locking module performs a locking action in response to a locking signal; The power supply module provides operating voltage for the leakage detection module, signal processing module, main control module, alarm module, and interlocking module.

2. A high voltage live display interlock device for monitoring a leakage current as claimed in claim 1, wherein, The leakage current detection module includes: a leakage current sensor; The acquisition terminal of the leakage current sensor is used to acquire leakage current signals, and the output terminal of the leakage current sensor is electrically connected to the signal processing module.

3. A high voltage live display interlock device for monitoring a leakage current as claimed in claim 2, wherein, The leakage current sensor is specifically a permalloy open sensor.

4. A high voltage live display interlock device for monitoring a leakage current as claimed in claim 1, wherein, The signal processing module includes: a voltage conversion circuit, a filter circuit, an amplifier circuit, and a conditioning circuit; The input terminal of the voltage conversion circuit is electrically connected to the leakage current detection module, the output terminal of the voltage conversion circuit is electrically connected to the input terminal of the filter circuit, the output terminal of the filter circuit is electrically connected to the input terminal of the amplifier circuit, the output terminal of the amplifier circuit is electrically connected to the first input terminal of the conditioning circuit, and the output terminal of the conditioning circuit is electrically connected to the main control module.

5. A high voltage live display interlock device for monitoring a leakage current as claimed in claim 4 wherein, The conditioning circuit is also provided with a second input terminal for obtaining the reference voltage of the corresponding type of surge arrester.

6. A high voltage live display interlock device for monitoring a leakage current as claimed in claim 1, wherein, The main control module includes: a microcontroller and a latching drive circuit; The input terminal of the microcontroller is electrically connected to the signal processing module, the first output terminal of the microcontroller is electrically connected to the alarm module, the second output terminal of the microcontroller is electrically connected to the input terminal of the interlocking drive circuit, and the output terminal of the interlocking drive circuit is electrically connected to the interlocking module.

7. A high voltage live display interlock device for monitoring a leakage current as claimed in claim 6 wherein, The latching drive circuit includes: a coil relay, a transistor, a current-limiting resistor, and a pull-down resistor; One end of the current-limiting resistor is electrically connected to the microcontroller, the other end of the current-limiting resistor is electrically connected to the base of the transistor, one end of the pull-down resistor is electrically connected to the base of the transistor, the other end of the pull-down resistor is grounded, the emitter of the transistor is grounded, the collector of the transistor is electrically connected to the controlled terminal of the coil relay, and the control terminal of the coil relay is electrically connected to the interlocking module.

8. A high voltage live display interlock device for monitoring a leakage current as claimed in claim 1, wherein, The alarm module includes at least one or more combinations of indicator lights and buzzers.

9. A high voltage live display interlock device for monitoring a leakage current as claimed in claim 1, wherein, The interlocking module includes: an electromagnetic lock circuit and a microcomputer anti-misoperation circuit; The controlled terminals of the electromagnetic lock circuit and the microcomputer anti-misoperation circuit are electrically connected to the main control module.

10. A high voltage live display interlock device for monitoring a leakage current as claimed in claim 9, wherein, The electromagnetic lock circuit is also provided with an electromagnetic lock interface, and the microcomputer anti-misoperation circuit is also provided with a microcomputer anti-misoperation computer key interface.

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