Detection circuit and detection method of lightning arrester leakage current monitor

Abstract

The invention provides a detection circuit and a detection method of a lightning arrester leakage current monitor, and relates to the technical field of lightning arresters. The detection circuit comprises a first magnetic control reed switch, a second magnetic control reed switch and a third resistor which are located in the lightning arrester leakage current monitor; one end of the first magnetic control reed switch is connected with the lightning arrester, and the other end of the first magnetic control reed switch is grounded and is connected in parallel with the voltage-regulator tube and the full-bridge rectification loop; the second magnetic control reed switch is connected in series with the third resistor, is arranged between the filter capacitor and the milliammeter, and is connected in parallel with the second resistor; the first magnetic control reed pipe is triggered to be closed or opened under the action of the magnetic force of the magnet so as to control the magnitude of the current shown by the milliammeter; under the action of magnetic force, the second magnetic control reed switch triggers the second magnetic control reed switch to be switched on or switched off so as to control the magnitude of current shown by the milliammeter. The problem of pointer clamping stagnation can be found in time.

Description

Technical Field

[0001] This application relates to the field of surge arrester technology, and in particular to a detection circuit and detection method for a surge arrester leakage current monitoring instrument. Background Technology

[0002] Surge arresters are crucial protective devices for power system equipment against lightning overvoltages and other transient overvoltages. Surge arresters include zinc oxide arresters. The leakage current of a surge arrester (such as a zinc oxide arrester) can be monitored using a surge arrester leakage current monitor. Under normal conditions, the resistance of the surge arrester is very high, and the leakage current is, for example, a few milliamperes.

[0003] Currently, because the leakage current of surge arresters varies very little, the pointer of the surge arrester leakage current monitoring instrument often remains in a fixed range, which can easily cause it to jam and pose a potential safety hazard to the operation of the surge arrester. Therefore, there is an urgent need for an effective detection circuit for monitoring the leakage current of surge arresters. Summary of the Invention

[0004] This application provides a detection circuit and detection method for a surge arrester leakage current monitor, so as to effectively detect the pointer of the surge arrester leakage current monitor.

[0005] In a first aspect, this application provides a detection circuit for a surge arrester leakage current monitor, which includes a first resistor, a discharge gap, a Zener diode, a full-bridge rectifier circuit, a filter capacitor, a second resistor, and a milliammeter; one end of the first resistor is connected to the surge arrester, and the other end is grounded through the discharge gap; one end of the Zener diode is connected to the surge arrester, and the other end is grounded; the first end of the full-bridge rectifier circuit is connected to the surge arrester, the second end is connected to the third end of the full-bridge rectifier circuit in sequence through the second resistor and the milliammeter, and is also connected to the third end through the filter capacitor, and the fourth end of the full-bridge rectifier circuit is grounded; the detection circuit includes: a first magnetic reed switch, a second magnetic reed switch, and a third resistor located within the surge arrester leakage current monitor;

[0006] Among them, one end of the first magnetic reed switch is connected to the surge arrester, the other end is grounded, and it is connected in parallel with the Zener diode and the full-bridge rectifier circuit; the second magnetic reed switch and the third resistor are connected in series between the filter capacitor and the milliammeter, and are connected in parallel with the second resistor.

[0007] The first magnetic reed switch is used to trigger the first magnetic reed switch to close or open under the action of the magnetic force of the magnet, so as to control the magnitude of the current shown by the milliammeter;

[0008] The second magnetic reed switch is used to trigger the second magnetic reed switch to close or open under the action of magnetic force, so as to control the magnitude of the current shown by the milliammeter.

[0009] Optionally, the detection circuit also includes an inductor connected in series between the second magnetic reed switch and the third resistor, used to control the growth rate of the current flowing through the milliammeter when the second magnetic reed switch is closed; the inductive reactance of the inductor is greater than the capacitive reactance of the filter capacitor.

[0010] Optionally, the detection circuit also includes a control unit located within the surge arrester leakage current monitor, a power supply for the control unit, and a first relay and a second relay electrically connected to the control unit respectively; the control unit is communicatively connected to a terminal, the first contact of the first relay is connected in parallel with a second magnetic reed switch, and the second contact of the second relay is connected in parallel with the first magnetic reed switch; wherein: the control unit is used to, in response to receiving a first command sent by the terminal, control the first contact to close via the first relay, so that the charge stored in the filter capacitor is released through the third resistor, increasing the current flowing through the milliammeter, so that the pointer of the milliammeter swings from the current pointer position to the maximum range position; and in response to receiving a second command sent by the terminal, control the first contact to open via the first relay, so that the pointer of the milliammeter swings from the maximum range position to the current pointer position; in response to receiving a third command sent by the terminal, control the second contact to close via the second relay, so that the current flowing through the milliammeter decreases, so that the pointer of the milliammeter swings from the current pointer position to the zero position; and in response to receiving a fourth command sent by the terminal, control the second contact to open via the second relay, so that the pointer of the milliammeter swings from the zero position to the current pointer position.

[0011] Optionally, when the first magnetic reed switch is closed due to magnetic force, the pointer of the milliammeter swings from the current pointer position to the zero position to indicate that the pointer is working normally; when the first magnetic reed switch is closed due to magnetic force, the pointer of the milliammeter does not swing from the current pointer position to the zero position to indicate that the pointer is working abnormally; when the first magnetic reed switch is opened away from the magnetic force, the pointer of the milliammeter swings from the zero position to the current pointer position to indicate that the pointer is working normally; when the first magnetic reed switch is opened away from the magnetic force, the pointer of the milliammeter does not swing from the zero position to the current pointer position to indicate that the pointer is working abnormally.

[0012] Optionally, when the second magnetic reed switch is closed due to magnetic force, the milliammeter pointer moves from the current pointer position to the maximum range position to indicate that the pointer is working normally; when the second magnetic reed switch is closed due to magnetic force, the milliammeter pointer does not move from the current pointer position to the maximum range position to indicate that the pointer is malfunctioning; when the second magnetic reed switch is opened away from the magnetic force, the milliammeter pointer moves from the maximum range position to the current pointer position to indicate that the pointer is working normally; when the second magnetic reed switch is opened away from the magnetic force, the milliammeter pointer does not move from the maximum range position to the current pointer position to indicate that the pointer is malfunctioning.

[0013] Optionally, the first resistor is used to provide overcurrent protection for the surge arrester leakage current monitor; the discharge gap is used to provide overvoltage protection for the surge arrester leakage current monitor; the Zener diode is used to keep the voltage of the surge arrester leakage current monitor within a preset range; the full-bridge rectifier circuit is used to convert the AC current obtained from the surge arrester into DC current; the filter capacitor is used to filter the DC current to obtain the filtered DC current; the second resistor is used to ensure that the current flowing through the milliammeter does not exceed the maximum range of the milliammeter; the milliammeter is used to indicate the current value flowing through the milliammeter via a pointer.

[0014] Secondly, this application provides a detection method for a surge arrester leakage current monitor, applied to the control unit in the detection circuit of the surge arrester leakage current monitor as described in the first aspect of this application, the detection method comprising:

[0015] In response to receiving a first instruction from the terminal, the first contact is closed by controlling the first relay, so that the charge stored in the filter capacitor is released through the third resistor, and the current flowing through the milliammeter increases, so that the pointer of the milliammeter swings from the current pointer position to the maximum range position; and in response to receiving a second instruction from the terminal, the first contact is opened by controlling the first relay, so that the pointer of the milliammeter swings from the maximum range position to the current pointer position.

[0016] In response to receiving a third instruction from the terminal, the second relay controls the second contact to close, thereby reducing the current flowing through the milliammeter and causing the pointer of the milliammeter to swing from the current pointer position to the zero position; and in response to receiving a fourth instruction from the terminal, the second relay controls the second contact to open, thereby causing the pointer of the milliammeter to swing from the zero position to the current pointer position.

[0017] Thirdly, this application provides a detection device for a surge arrester leakage current monitor, applied to the control unit in the detection circuit of the surge arrester leakage current monitor as described in the first aspect of this application, the detection device comprising:

[0018] The first processing module is configured to, in response to receiving a first instruction from the terminal, control the first contact to close via the first relay, so that the charge stored in the filter capacitor is released through the third resistor, and the current flowing through the milliammeter increases, so that the pointer of the milliammeter swings from the current pointer position to the maximum range position; and in response to receiving a second instruction from the terminal, control the first contact to open via the first relay, so that the pointer of the milliammeter swings from the maximum range position to the current pointer position.

[0019] The second processing module is configured to, in response to receiving a third instruction from the terminal, control the second contact to close via the second relay, thereby reducing the current flowing through the milliammeter and causing the pointer of the milliammeter to swing from the current pointer position to the zero position; and in response to receiving a fourth instruction from the terminal, control the second contact to open via the second relay, thereby causing the pointer of the milliammeter to swing from the zero position to the current pointer position.

[0020] Fourthly, this application provides an electronic device, including: a processor, and a memory communicatively connected to the processor;

[0021] The memory stores the instructions that the computer executes;

[0022] The processor executes computer execution instructions stored in memory to implement the detection method of the surge arrester leakage current monitor as described in the second aspect of this application.

[0023] Fifthly, this application provides a computer-readable storage medium storing computer program instructions, which, when executed, implement the detection method of the surge arrester leakage current monitor as described in the second aspect of this application.

[0024] Sixthly, this application provides a computer program product, including a computer program that, when executed, implements the detection method of the surge arrester leakage current monitor as described in the second aspect of this application.

[0025] This application provides a detection circuit and detection method for a surge arrester leakage current monitor. The detection circuit includes a first magnetic reed switch, a second magnetic reed switch, and a third resistor located within the surge arrester leakage current monitor. One end of the first magnetic reed switch is connected to the surge arrester, and the other end is grounded and connected in parallel with a Zener diode and a full-bridge rectifier circuit. The second magnetic reed switch and the third resistor are connected in series between a filter capacitor and a milliammeter, and are connected in parallel with the second resistor. Under the action of a magnet, the first magnetic reed switch is triggered to close or open, thereby controlling the magnitude of the current indicated by the milliammeter. Under the action of a magnet, the second magnetic reed switch is triggered to close or open, thereby controlling the magnitude of the current indicated by the milliammeter. This application can promptly detect pointer jamming issues in surge arrester leakage current monitors, effectively reducing the probability of erroneous pointer readings posing potential hazards to surge arrester operation. It also ensures the structural integrity of the surge arrester leakage current monitor, facilitating installation while guaranteeing its dustproof and waterproof performance. This, in turn, helps reduce maintenance work, lowers operation and maintenance costs, and minimizes the risks and economic losses caused by power outages during maintenance. Attached Figure Description

[0026] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0027] Figure 1 A circuit diagram illustrating the connection between the surge arrester leakage current monitor and the surge arrester, provided for related technologies;

[0028] Figure 2 A schematic diagram of the detection circuit of a surge arrester leakage current monitor provided in an embodiment of this application;

[0029] Figure 3 A schematic diagram of the detection circuit of a surge arrester leakage current monitor provided in another embodiment of this application;

[0030] Figure 4 A schematic diagram of the detection circuit of a surge arrester leakage current monitoring instrument provided in another embodiment of this application;

[0031] Figure 5 A schematic diagram illustrating communication between a main control microcontroller and a terminal, provided in an embodiment of this application;

[0032] Figure 6 A flowchart illustrating the detection method of a surge arrester leakage current monitoring instrument provided in an embodiment of this application;

[0033] Figure 7 A schematic diagram of the detection device of the surge arrester leakage current monitoring instrument provided in an embodiment of this application;

[0034] Figure 8 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application.

[0035] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0037] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, data stored, data displayed, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties. Furthermore, the collection, use and processing of the relevant data must comply with relevant laws, regulations and standards, and corresponding operation entry points are provided for users to choose to authorize or refuse.

[0038] Surge arresters are crucial protective devices for power system equipment against lightning overvoltages and other transient overvoltages. Surge arresters include zinc oxide surge arresters. The development of zinc oxide surge arresters has been rapid, now supporting applications in power systems with voltage levels up to 500 kV. Their technology has evolved from systems with series and parallel gaps to gapless systems, and the current-carrying capacity of the resistive elements has continuously increased. For example, zinc oxide surge arresters are almost universally used in newly built or renovated power systems ranging from 220 kV to 500 kV; they are also widely used in 110 kV and 35 kV power systems.

[0039] The leakage current of a surge arrester (such as a zinc oxide surge arrester) can be monitored using a surge arrester leakage current monitor. Figure 1 A circuit diagram illustrating the connection between a surge arrester leakage current monitor and a surge arrester, provided for related technologies. (Example:) Figure 1 As shown, under normal conditions, the resistance of the surge arrester is very large, and the leakage current of the surge arrester flowing through the surge arrester leakage current monitoring instrument is, for example, a few milliamperes.

[0040] Currently, due to the very small variation in the leakage current of surge arresters, the pointer of the surge arrester leakage current monitoring instrument often remains in a fixed range, easily becoming stuck, making it difficult for maintenance personnel to detect this defect. When an internal fault in the surge arrester causes an increase in leakage current, the stuck pointer of the surge arrester leakage current monitoring instrument cannot reflect the true data, posing a potential hazard to the operation of the surge arrester. Therefore, there is an urgent need for an effective detection circuit for monitoring the leakage current of surge arresters.

[0041] To address the aforementioned problems, this application provides a detection circuit and method for a surge arrester leakage current monitor. By adding a detection circuit to the surge arrester leakage current monitor, the pointer of the milliammeter in the monitor is moved from its current position to the zero position and from its current position to the maximum range position. The pointer movement covers the entire range of the milliammeter, thus ensuring that pointer jamming can be detected promptly. Based on the concept of passive design, manual pointer movement prevents the pointer from jamming due to prolonged exposure to a fixed range. Alternatively, remote pointer movement can also be used to prevent pointer jamming.

[0042] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0043] Figure 2 This is a schematic diagram of the detection circuit of a surge arrester leakage current monitor according to an embodiment of this application. The surge arrester leakage current monitor includes a first resistor, a discharge gap, a Zener diode, a full-bridge rectifier circuit, a filter capacitor, a second resistor, and a milliammeter. One end of the first resistor is connected to the surge arrester, and the other end is grounded through the discharge gap. One end of the Zener diode is connected to the surge arrester, and the other end is grounded. The first end of the full-bridge rectifier circuit is connected to the surge arrester, the second end is connected to the third end of the full-bridge rectifier circuit sequentially through the second resistor and the milliammeter, and the second end is connected to the third end through the filter capacitor. The fourth end of the full-bridge rectifier circuit is grounded. Figure 2 As shown, the detection circuit of the surge arrester leakage current monitor according to an embodiment of this application includes: a first magnetic reed switch, a second magnetic reed switch, and a third resistor located within the surge arrester leakage current monitor; wherein, one end of the first magnetic reed switch is connected to the surge arrester, the other end is grounded, and it is connected in parallel with the Zener diode and the full-bridge rectifier circuit; the second magnetic reed switch and the third resistor are connected in series between the filter capacitor and the milliammeter, and are connected in parallel with the second resistor.

[0044] The first magnetic reed switch is used to trigger the first magnetic reed switch to close or open under the action of the magnetic force of the magnet, so as to control the magnitude of the current shown by the milliammeter.

[0045] The second magnetic reed switch is used to trigger the second magnetic reed switch to close or open under the action of the magnetic force of the magnet, so as to control the magnitude of the current shown by the milliammeter.

[0046] In this embodiment of the application, for example, the original surge arrester leakage current monitor 200 (i.e., without the detection circuit of this embodiment) includes a first resistor R1, a discharge gap J, a Zener diode D1, a full-bridge rectifier circuit D2, a filter capacitor C, a second resistor R2, and a milliammeter 201; one end of the first resistor R1 is connected to the surge arrester, and the other end is grounded through the discharge gap J; one end of the Zener diode D1 is connected to the surge arrester, and the other end is grounded; the first end of the full-bridge rectifier circuit D2 is connected to the surge arrester, the second end is connected to the third end of the full-bridge rectifier circuit in sequence through the second resistor R2 and the milliammeter 201, and is connected to the third end through the filter capacitor C, and the fourth end of the full-bridge rectifier circuit D2 is grounded.

[0047] Optionally, the first resistor R1 is used for overcurrent protection of the surge arrester leakage current monitor 200; the discharge gap J is used for overvoltage protection of the surge arrester leakage current monitor 200; the Zener diode D1 is used to keep the voltage of the surge arrester leakage current monitor 200 within a preset range; the full-bridge rectifier circuit D2 is used to convert the AC current obtained from the surge arrester into DC current; the filter capacitor C is used to filter the DC current to obtain the filtered DC current; the second resistor R2 is used to ensure that the current flowing through the milliammeter 201 does not exceed the maximum range of the milliammeter 201; the milliammeter 201 is used to indicate the current value flowing through the milliammeter 201 via a pointer. The milliammeter 201 is a mechanical current indicating device including a pointer.

[0048] The detection circuit of the surge arrester leakage current monitor 200 includes: a first magnetic reed switch K1, a second magnetic reed switch K2, and a third resistor R3 located within the surge arrester leakage current monitor 200. One end of the first magnetic reed switch K1 is connected to the surge arrester, and the other end is grounded, and it is connected in parallel with the Zener diode D1 and the full-bridge rectifier circuit D2. The second magnetic reed switch K2 and the third resistor R3 are connected in series between the filter capacitor C and the milliammeter 201, and are connected in parallel with the second resistor R2.

[0049] It is understood that the use of a first magnetic reed switch K1 and a second magnetic reed switch K2 in this embodiment is based on considerations of convenient installation and waterproof and dustproof effects. The first magnetic reed switch K1 and the second magnetic reed switch K2 are installed inside the surge arrester leakage current monitor 200. The closing or opening of the first magnetic reed switch K1 and the second magnetic reed switch K2 is controlled by the approach or departure of a magnet outside the surge arrester leakage current monitor 200. In one example, maintenance personnel manually control the magnet to approach the first magnetic reed switch K1 (without needing to distinguish the magnetic poles). Correspondingly, when the first magnetic reed switch K1 senses the magnetic force of the magnet, it is triggered to close, causing the current flowing through the milliammeter 201 to decrease, approaching zero, so that the pointer of the milliammeter 201 swings from the current pointer position to the zero position. When the maintenance personnel manually control the magnet to move away from the first magnetic reed switch K1, the first magnetic reed switch K1 is triggered to disconnect when it is away from the magnetic force of the magnet, so that the pointer of the milliammeter 201 swings from the zero position to the current pointer position, and the surge arrester leakage current monitor 200 returns to normal operation.

[0050] In another example, refer to Figure 2Taking the example of a magnet approaching the second magnetic reed switch K2, the maintenance personnel manually control the magnet to approach the second magnetic reed switch K2 (without needing to distinguish the magnetic poles). Correspondingly, when the second magnetic reed switch K2 senses the magnetic force, it is triggered to close. The filter capacitor C and the third resistor R3 form an RC discharge circuit, causing the charge stored in the filter capacitor C to be released through the third resistor R3. The current flowing through the milliammeter 201 increases briefly, causing the pointer of the milliammeter 201 to swing from its current position to its maximum range. By determining a suitable resistance value for the third resistor R3, the pointer of the milliammeter 201 can swing to its maximum range. When the maintenance personnel manually control the magnet to move away from the second magnetic reed switch K2, correspondingly, when the magnetic force of the magnet is removed, the second magnetic reed switch K2 is triggered to open, causing the pointer of the milliammeter 201 to swing from its maximum range position back to its current position, and the surge arrester leakage current monitor 200 returns to normal operation.

[0051] The detection circuit in this embodiment of the application adopts a first magnetic reed switch K1 and a second magnetic reed switch K2 to achieve a passive design. It does not require damage to the original overall structure of the surge arrester leakage current monitor 200, which can ensure the structural integrity of the surge arrester leakage current monitor 200. While facilitating installation, it also ensures the dustproof and waterproof performance of the surge arrester leakage current monitor 200.

[0052] Optionally, when the first magnetic reed switch K1 is closed due to magnetic force, the pointer of the milliammeter 201 moves from the current pointer position to the zero position to indicate that the pointer is working normally; when the first magnetic reed switch K1 is closed due to magnetic force, the pointer of the milliammeter 201 does not move from the current pointer position to the zero position to indicate that the pointer is working abnormally; when the first magnetic reed switch is opened away from the magnetic force, the pointer of the milliammeter moves from the zero position to the current pointer position to indicate that the pointer is working normally; when the first magnetic reed switch is opened away from the magnetic force, the pointer of the milliammeter does not move from the zero position to the current pointer position to indicate that the pointer is working abnormally.

[0053] For example, when the first magnetic reed switch K1 is closed due to magnetic force, the pointer of the milliammeter 201 swings from its current position to the zero position, indicating that the pointer is working normally. If the pointer of the milliammeter 201 does not swing from its current position to the zero position when the first magnetic reed switch K1 is closed due to magnetic force, it indicates that the pointer is stuck, and the maintenance personnel can determine that the pointer is malfunctioning, thus helping them to promptly identify the pointer stuck problem and take appropriate action. When the first magnetic reed switch is disconnected and away from the magnetic force, the pointer of the milliammeter swings from the zero position to the current position, indicating that the pointer is working normally. If the pointer of the milliammeter does not swing from the zero position to the current position when the first magnetic reed switch is disconnected and away from the magnetic force, the maintenance personnel can determine that the pointer is malfunctioning, thus helping them to promptly identify the pointer stuck problem and take appropriate action.

[0054] Optionally, when the second magnetic reed switch K2 is closed due to magnetic force, the pointer of the milliammeter 201 moves from the current pointer position to the maximum range position to indicate that the pointer is working normally; when the second magnetic reed switch K2 is closed due to magnetic force, the pointer of the milliammeter 201 does not move from the current pointer position to the maximum range position to indicate that the pointer is working abnormally; when the second magnetic reed switch is opened away from the magnetic force, the pointer of the milliammeter moves from the maximum range position to the current pointer position to indicate that the pointer is working normally; when the second magnetic reed switch is opened away from the magnetic force, the pointer of the milliammeter does not move from the maximum range position to the current pointer position to indicate that the pointer is working abnormally.

[0055] For example, when the second magnetic reed switch K2 is closed due to magnetic force, the pointer of the milliammeter 201 swings from its current position to its maximum range, indicating that the pointer is working normally. If the pointer of the milliammeter 201 does not swing from its current position to its maximum range when the second magnetic reed switch K2 is closed due to magnetic force, it indicates that the pointer is stuck, and the maintenance personnel can determine that the pointer is malfunctioning, thus helping them to promptly identify the stuck pointer problem and take appropriate action. When the second magnetic reed switch is disconnected and away from the magnetic force, the pointer of the milliammeter swings from its maximum range to its current position, indicating that the pointer is working normally. Again, if the pointer of the milliammeter does not swing from its maximum range to its current position when the second magnetic reed switch is disconnected and away from the magnetic force, the maintenance personnel can determine that the pointer is malfunctioning, thus helping them to promptly identify the stuck pointer problem and take appropriate action.

[0056] Understandably, after two tests, the swing of the milliammeter pointer covers the entire range of the milliammeter, which can ensure that pointer jamming problems can be detected in a timely manner.

[0057] The detection circuit of the surge arrester leakage current monitor provided in this application includes a first magnetic reed switch, a second magnetic reed switch, and a third resistor located within the surge arrester leakage current monitor. One end of the first magnetic reed switch is connected to the surge arrester, and the other end is grounded and connected in parallel with the Zener diode and the full-bridge rectifier circuit. The second magnetic reed switch and the third resistor are connected in series between the filter capacitor and the milliammeter and are connected in parallel with the second resistor. Under the action of the magnetic force of the magnet, the first magnetic reed switch is triggered to close or open to control the magnitude of the current indicated by the milliammeter. Under the action of the magnetic force, the second magnetic reed switch is triggered to close or open to control the magnitude of the current indicated by the milliammeter. The embodiments of this application can promptly detect pointer jamming problems in surge arrester leakage current monitors, effectively reducing the probability of erroneous pointer readings causing potential hazards to surge arrester operation. Furthermore, it ensures the structural integrity of the surge arrester leakage current monitor, facilitating installation while guaranteeing its dustproof and waterproof performance. This helps reduce maintenance work, lowers operation and maintenance costs, and minimizes the risks and economic losses associated with power outages during maintenance.

[0058] Based on the above embodiments, Figure 3 This is a schematic diagram of the detection circuit of a surge arrester leakage current monitoring instrument provided in another embodiment of this application. Figure 3 As shown, the detection circuit of the surge arrester leakage current monitor in this embodiment may further include an inductor, which is connected in series between the second magnetic reed switch and the third resistor, and is used to control the growth rate of the current flowing through the milliammeter when the second magnetic reed switch is closed; the inductive reactance of the inductor is greater than the capacitive reactance of the filter capacitor. For example, refer to... Figure 3 To prevent excessive current from flowing through the milliammeter 201 and exceeding its maximum range when the second reed switch K2 is turned on, an inductor L can be connected in series in the surge arrester leakage current monitoring circuit. Inductor L is connected between the second reed switch K2 and the third resistor R3 to control the rate of current increase through the milliammeter 201 when the second reed switch K2 is closed, reducing the current increase rate and preventing excessive pointer fluctuations, thus ensuring a stable pointer amplitude. To prevent series resonance between inductor L, filter capacitor C, and third resistor R3, the inductive reactance of inductor L should avoid the series resonance condition of inductor L, filter capacitor C, and third resistor R3. For example, the inductive reactance of inductor L can be greater than the capacitive reactance of the filter capacitor.

[0059] Based on the above embodiments, Figure 4 This is a schematic diagram of the detection circuit of a surge arrester leakage current monitoring instrument provided in another embodiment of this application. Figure 4 As shown, the detection circuit of the surge arrester leakage current monitor in this embodiment may further include a control unit 202 located within the surge arrester leakage current monitor, a power supply VCC for the control unit 202, and a first relay 203 and a second relay 204 electrically connected to the control unit 202 respectively; the control unit 202 and the terminal ( Figure 4 (Not shown in the image) Communication connection, the first contact K3 of the first relay 203 is connected in parallel with the second magnetic reed switch K2, and the second contact K4 of the second relay 204 is connected in parallel with the first magnetic reed switch K1; wherein:

[0060] The control unit 202 is configured to, in response to receiving a first instruction from the terminal, control the first contact K3 to close via the first relay 203, causing the charge stored in the filter capacitor C to be released through the third resistor R3, increasing the current flowing through the milliammeter 201, so that the pointer of the milliammeter 201 swings from the current pointer position to the maximum range position; and in response to receiving a second instruction from the terminal, control the first contact K3 to open via the first relay 203, so that the pointer of the milliammeter 201 swings from the maximum range position to the current pointer position; in response to receiving a third instruction from the terminal, control the second contact K4 to close via the second relay 204, causing the current flowing through the milliammeter 201 to decrease, so that the pointer of the milliammeter 201 swings from the current pointer position to the zero position; and in response to receiving a fourth instruction from the terminal, control the second contact K4 to open via the second relay 204, so that the pointer of the milliammeter 201 swings from the zero position to the current pointer position.

[0061] For example, refer to Figure 4 The control unit 202 can be a microcontroller or other control device. The power supply for the control unit 202 can be a 5V lithium battery or a photovoltaic charging circuit that provides power to the control unit 202. The control unit 202 is connected to the first relay 203 via the first input / output terminal (I / O 1) and to the second relay 204 via the second input / output terminal (I / O 2). Figure 5 This is a schematic diagram illustrating communication between a main control microcontroller and a terminal, provided in one embodiment of this application. Figure 5 As shown, the terminal is, for example, a mobile phone. The communication method between the mobile phone and the main control microcontroller can include at least one of infrared communication, Bluetooth communication, or Wireless Fidelity (WiFi) communication. In response to receiving a first or second command from the mobile phone, the main control microcontroller controls the closing or opening of a first contact via a first relay; and in response to receiving a third or fourth command from the mobile phone, the main control microcontroller controls the closing or opening of a second contact via a second relay. These commands are, for example, triggered by maintenance personnel through an application (APP) on the mobile phone.

[0062] refer to Figure 4 The control unit 202 controls the opening or closing of the first contact K3 via the first relay 203 to detect whether the pointer of the milliammeter 201 can swing from the current pointer position to the maximum range position. The control unit 202 also controls the opening or closing of the second contact K4 via the second relay 204 to detect whether the pointer of the milliammeter 201 can swing from the current pointer position to the zero position, thus achieving full-range detection of the pointer of the milliammeter 201 to ensure timely detection of pointer jamming. The detection circuit of the surge arrester leakage current monitor in this embodiment can provide manual or remote control swinging of the milliammeter pointer, protecting it from jamming due to prolonged stay in a fixed area.

[0063] Based on the above embodiments, Figure 6 The flowchart illustrates a detection method for a surge arrester leakage current monitor according to an embodiment of this application, applied to the control unit in the detection circuit of the surge arrester leakage current monitor as described in any of the above embodiments. Figure 6 As shown, the detection method in this application embodiment includes:

[0064] S601. In response to receiving a first instruction from the terminal, the first contact is closed by controlling the first relay, so that the charge stored in the filter capacitor is released through the third resistor, and the current flowing through the milliammeter increases, so that the pointer of the milliammeter swings from the current pointer position to the maximum range position; and in response to receiving a second instruction from the terminal, the first contact is opened by controlling the first relay, so that the pointer of the milliammeter swings from the maximum range position to the current pointer position.

[0065] For example, refer to Figure 4 The terminal, such as a mobile phone, can communicate with the control unit via at least one of infrared, Bluetooth, or WiFi communication. The first command, for example, is triggered by a maintenance personnel through a mobile app. Correspondingly, upon receiving the first command from the terminal, the control unit closes the first contact via a first relay, causing the charge stored in the filter capacitor to be released through a third resistor, increasing the current flowing through the milliammeter, thus moving the milliammeter pointer from its current position to its maximum range. The second command, also triggered by a maintenance personnel through a mobile app, similarly, upon receiving the second command from the terminal, opens the first contact via a first relay, causing the milliammeter pointer to move from its maximum range position back to its current position, thus restoring the surge arrester leakage current monitor to normal operation. Through the first and second commands, the detection from the current pointer position to the maximum range position is completed.

[0066] S602, in response to receiving a third instruction from the terminal, controlling the second contact to close via the second relay, thereby reducing the current flowing through the milliammeter so that the pointer of the milliammeter swings from the current pointer position to the zero position; and in response to receiving a fourth instruction from the terminal, controlling the second contact to open via the second relay so that the pointer of the milliammeter swings from the zero position to the current pointer position.

[0067] For example, the third command might be triggered by maintenance personnel via a mobile app. Correspondingly, in response to receiving the third command from the terminal, the control unit controls the second contact to close via the second relay, reducing the current flowing through the milliammeter and causing the milliammeter pointer to swing from its current position to the zero position. Similarly, the fourth command might be triggered by maintenance personnel via a mobile app. Correspondingly, in response to receiving the fourth command from the terminal, the control unit controls the second contact to open via the second relay, causing the milliammeter pointer to swing from the zero position back to its current position, thus restoring the surge arrester leakage current monitor to normal operation. The detection from the current pointer position to the zero position is completed through the third and fourth commands.

[0068] It should be noted that the embodiments of this application do not limit the order in which S601 and S602 are executed.

[0069] The surge arrester leakage current monitoring method provided in this application embodiment, in response to a first command received from a terminal, controls the first contact to close via a first relay, causing the charge stored in the filter capacitor to be released through a third resistor, increasing the current flowing through the milliammeter, so that the milliammeter pointer swings from the current pointer position to the maximum range position; in response to a second command received from the terminal, controls the first contact to open via the first relay, so that the milliammeter pointer swings from the maximum range position to the current pointer position; in response to a third command received from the terminal, controls the second contact to close via a second relay, causing the current flowing through the milliammeter to decrease, so that the milliammeter pointer swings from the current pointer position to the zero position; and in response to a fourth command received from the terminal, controls the second contact to open via the second relay, so that the milliammeter pointer swings from the zero position to the current pointer position. This application embodiment enables the milliammeter pointer to swing across the entire range of the milliammeter, thereby ensuring that pointer jamming problems can be detected in a timely manner, effectively reducing the probability of erroneous pointer readings causing potential hazards to the surge arrester operation.

[0070] The following are embodiments of the apparatus described in this application, which can be used to execute the embodiments of the method described in this application. For details not disclosed in the apparatus embodiments of this application, please refer to the embodiments of the method described in this application.

[0071] Figure 7This is a schematic diagram of the detection device of a surge arrester leakage current monitor according to an embodiment of this application, applied to the control unit in the detection circuit of the surge arrester leakage current monitor as described in any of the above embodiments. Figure 7 As shown, the detection device 700 of the surge arrester leakage current monitoring instrument according to an embodiment of this application includes: a first processing module 701 and a second processing module 702. Wherein:

[0072] The first processing module 701 is configured to, in response to receiving a first instruction sent by the terminal, control the first contact to close via the first relay, so that the charge stored in the filter capacitor is released through the third resistor, and the current flowing through the milliammeter increases, so that the pointer of the milliammeter swings from the current pointer position to the maximum range position; and in response to receiving a second instruction sent by the terminal, control the first contact to open via the first relay, so that the pointer of the milliammeter swings from the maximum range position to the current pointer position.

[0073] The second processing module 702 is configured to, in response to receiving a third instruction sent by the terminal, control the second contact to close via the second relay, thereby reducing the current flowing through the milliammeter so that the pointer of the milliammeter swings from the current pointer position to the zero position; and in response to receiving a fourth instruction sent by the terminal, control the second contact to open via the second relay so that the pointer of the milliammeter swings from the zero position to the current pointer position.

[0074] The apparatus of this application embodiment can be used to execute the detection method of the surge arrester leakage current monitor in any of the above-described method embodiments. Its implementation principle and technical effect are similar, and will not be repeated here.

[0075] Figure 8 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Figure 8 As shown, the electronic device 800 may include at least one processor 801 and a memory 802.

[0076] The memory 802 is used to store programs. Specifically, the program may include program code, which includes computer-executable instructions.

[0077] The memory 802 may include high-speed random access memory (RAM) and may also include non-volatile memory, such as at least one disk storage device.

[0078] The processor 801 executes computer execution instructions stored in the memory 802 to implement the detection method of the surge arrester leakage current monitor described in the foregoing method embodiments. The processor 801 may be a central processing unit (CPU), an application-specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of this application. Specifically, when implementing the detection method of the surge arrester leakage current monitor described in the foregoing method embodiments, the electronic device may be, for example, a control unit or other electronic device with processing capabilities in the detection circuit of the surge arrester leakage current monitor.

[0079] Optionally, the electronic device 800 may also include a communication interface 803. In specific implementations, if the communication interface 803, memory 802, and processor 801 are implemented independently, they can be interconnected via a bus to complete communication. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. Buses can be categorized as address buses, data buses, control buses, etc., but this does not imply that there is only one bus or one type of bus.

[0080] Optionally, in a specific implementation, if the communication interface 803, memory 802, and processor 801 are integrated on a single chip, then the communication interface 803, memory 802, and processor 801 can communicate through an internal interface.

[0081] This application also provides a computer-readable storage medium storing computer program instructions, which, when executed by a processor, implements the above-mentioned detection method for a surge arrester leakage current monitor.

[0082] This application also provides a computer program product, including a computer program that, when executed, implements the above-described detection method for a surge arrester leakage current monitor.

[0083] The aforementioned computer-readable storage media can be implemented from any type of volatile or non-volatile storage device or a combination thereof, such as Static Random Access Memory (SRAM), Electrically Erasable Programmable Read Only Memory (EEPROM), Erasable Programmable Read Only Memory (EPROM), Programmable Read Only Memory (PROM), Read Only Memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk. The readable storage medium can be any available medium accessible to a general-purpose or special-purpose computer.

[0084] An exemplary readable storage medium is coupled to a processor, enabling the processor to read information from and write information to the readable storage medium. Of course, the readable storage medium can also be a component of the processor. The processor and the readable storage medium can reside in an application-specific integrated circuit (ASIC). Alternatively, the processor and the readable storage medium can exist as discrete components in the detection device of a surge arrester leakage current monitor.

[0085] Those skilled in the art will understand that all or part of the steps of the above-described method embodiments can be implemented by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When executed, the program performs the steps of the above-described method embodiments; and the aforementioned storage medium includes various media capable of storing program code, such as ROM, RAM, magnetic disks, or optical disks.

[0086] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A detection circuit for a surge arrester leakage current monitoring instrument, the surge arrester leakage current monitoring instrument comprising a first resistor, a discharge gap, a Zener diode, a full-bridge rectifier circuit, a filter capacitor, a second resistor, and a milliammeter; one end of the first resistor is connected to the surge arrester, and the other end is grounded through the discharge gap; one end of the Zener diode is connected to the surge arrester, and the other end is grounded; a first terminal of the full-bridge rectifier circuit is connected to the surge arrester, a second terminal is connected sequentially to a third terminal of the full-bridge rectifier circuit via the second resistor and the milliammeter, and is also connected to the third terminal via the filter capacitor; a fourth terminal of the full-bridge rectifier circuit is grounded, characterized in that... The detection circuit includes: a first magnetic reed switch, a second magnetic reed switch, and a third resistor located within the surge arrester leakage current monitor; Wherein, one end of the first magnetic reed switch is connected to the surge arrester, the other end is grounded, and it is connected in parallel with the Zener diode and the full-bridge rectifier circuit; the second magnetic reed switch and the third resistor are connected in series between the filter capacitor and the milliammeter, and are connected in parallel with the second resistor; The first magnetic reed switch is used to trigger the first magnetic reed switch to close or open under the action of the magnetic force of the magnet, so as to control the magnitude of the current shown by the milliammeter; The second magnetic reed switch is used to trigger the second magnetic reed switch to close or open under the action of the magnetic force, so as to control the magnitude of the current shown by the milliammeter.

2. The detection circuit according to claim 1, characterized in that, It also includes an inductor, which is connected in series between the second magnetic reed switch and the third resistor, and is used to control the growth rate of the current flowing through the milliammeter when the second magnetic reed switch is closed; the inductive reactance of the inductor is greater than the capacitive reactance of the filter capacitor.

3. The detection circuit according to claim 2, characterized in that, It also includes a control unit located within the surge arrester leakage current monitoring instrument, a power supply for the control unit, and a first relay and a second relay electrically connected to the control unit respectively; the control unit is communicatively connected to a terminal, the first contact of the first relay is connected in parallel with the second magnetic reed switch, and the second contact of the second relay is connected in parallel with the first magnetic reed switch; wherein: The control unit is configured to, in response to receiving a first instruction from the terminal, control the first contact to close via the first relay, causing the charge stored in the filter capacitor to be released through the third resistor, increasing the current flowing through the milliammeter, so that the pointer of the milliammeter swings from the current pointer position to the maximum range position; and in response to receiving a second instruction from the terminal, control the first contact to open via the first relay, so that the pointer of the milliammeter swings from the maximum range position to the current pointer position; in response to receiving a third instruction from the terminal, control the second contact to close via the second relay, causing the current flowing through the milliammeter to decrease, so that the pointer of the milliammeter swings from the current pointer position to the zero position; and in response to receiving a fourth instruction from the terminal, control the second contact to open via the second relay, so that the pointer of the milliammeter swings from the zero position to the current pointer position.

4. The detection circuit according to any one of claims 1 to 3, characterized in that, When the first magnetic reed switch is closed due to the magnetic force, the pointer of the milliammeter swings from the current pointer position to the zero position to indicate that the pointer is working normally; When the first magnetic reed switch is closed due to sensing the magnetic force, the pointer of the milliammeter does not swing from the current pointer position to the zero position, indicating that the pointer is malfunctioning; when the first magnetic reed switch is opened away from the magnetic force, the pointer of the milliammeter swings from the zero position to the current pointer position, indicating that the pointer is functioning normally. When the first reed switch is disconnected due to the magnetic force, the pointer of the milliammeter does not swing from the zero position to the current pointer position, indicating that the pointer is malfunctioning.

5. The detection circuit according to any one of claims 1 to 3, characterized in that, When the second magnetic reed switch is closed due to sensing the magnetic force, the pointer of the milliammeter swings from the current pointer position to the maximum range position to indicate that the pointer is working normally; When the second magnetic reed switch is closed due to sensing the magnetic force, the pointer of the milliammeter does not swing from the current pointer position to the maximum range position, which is used to indicate that the pointer is malfunctioning. When the second magnetic reed switch is disconnected due to the magnetic force, the pointer of the milliammeter swings from the maximum range position to the current pointer position to indicate that the pointer is working normally; When the second magnetic reed switch is disconnected due to the magnetic force, the pointer of the milliammeter does not swing from the maximum range position to the current pointer position, indicating that the pointer is malfunctioning.

6. The detection circuit according to any one of claims 1 to 3, characterized in that, The first resistor is used to provide overcurrent protection for the surge arrester leakage current monitor; the discharge gap is used to provide overvoltage protection for the surge arrester leakage current monitor; the Zener diode is used to keep the voltage of the surge arrester leakage current monitor within a preset range; the full-bridge rectifier circuit is used to convert the AC current obtained from the surge arrester into DC current; the filter capacitor is used to filter the DC current to obtain a filtered DC current; the second resistor is used to ensure that the current flowing through the milliammeter does not exceed the maximum range of the milliammeter; the milliammeter is used to indicate the current value flowing through the milliammeter via a pointer.

7. A detection method for a surge arrester leakage current monitoring instrument, characterized in that, The control unit applied in the detection circuit of the surge arrester leakage current monitoring instrument as described in claim 3, wherein the detection method includes: In response to receiving a first instruction from the terminal, the first contact is closed via the first relay, causing the charge stored in the filter capacitor to be released through the third resistor, increasing the current flowing through the milliammeter, so that the pointer of the milliammeter swings from the current pointer position to the maximum range position; and in response to receiving a second instruction from the terminal, the first contact is opened via the first relay, so that the pointer of the milliammeter swings from the maximum range position to the current pointer position; In response to receiving a third instruction from the terminal, the second contact is closed via the second relay, thereby reducing the current flowing through the milliammeter and causing the pointer of the milliammeter to swing from the current pointer position to the zero position; and in response to receiving a fourth instruction from the terminal, the second contact is opened via the second relay, thereby causing the pointer of the milliammeter to swing from the zero position to the current pointer position.

8. A detection device for a surge arrester leakage current monitoring instrument, characterized in that, The control unit applied in the detection circuit of the surge arrester leakage current monitoring instrument as described in claim 3, wherein the detection device comprises: The first processing module is configured to, in response to receiving a first instruction from the terminal, control the first contact to close via the first relay, so that the charge stored in the filter capacitor is released through the third resistor, and the current flowing through the milliammeter increases, so that the pointer of the milliammeter swings from the current pointer position to the maximum range position; and in response to receiving a second instruction from the terminal, control the first contact to open via the first relay, so that the pointer of the milliammeter swings from the maximum range position to the current pointer position; The second processing module is configured to, in response to receiving a third instruction from the terminal, control the second contact to close via the second relay, thereby reducing the current flowing through the milliammeter so that the pointer of the milliammeter swings from the current pointer position to the zero position; and in response to receiving a fourth instruction from the terminal, control the second contact to open via the second relay so that the pointer of the milliammeter swings from the zero position to the current pointer position.

9. An electronic device, characterized in that, include: A processor, and a memory communicatively connected to the processor; The memory stores computer-executed instructions; The processor executes the computer execution instructions stored in the memory to implement the detection method of the surge arrester leakage current monitor as described in claim 7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer program instructions, which, when executed, implement the detection method of the surge arrester leakage current monitor as described in claim 7.

11. A computer program product, comprising a computer program, characterized in that, When the computer program is executed, it implements the detection method of the surge arrester leakage current monitor as described in claim 7.

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