CN-121995288-A - Detection circuit and detection method of lightning arrester leakage current monitor

CN121995288ACN 121995288 ACN121995288 ACN 121995288ACN-121995288-A

Abstract

The application 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 pipe, a second magnetic control reed pipe and a third resistor which are arranged in the lightning arrester leakage current monitor, wherein one end of the first magnetic control reed pipe is connected with the lightning arrester, the other end of the first magnetic control reed pipe is grounded and is connected with the voltage stabilizing pipe and the full-bridge rectifying circuit in parallel, the second magnetic control reed pipe and the third resistor are connected in series, between the filter capacitor and the milliampere meter and connected with the second resistor in parallel, the first magnetic control reed pipe triggers the first magnetic control reed pipe to be closed or opened under the magnetic force of a magnet so as to control the current of the milliampere meter, and the second magnetic control reed pipe triggers the second magnetic control reed pipe to be closed or opened under the magnetic force so as to control the current of the milliampere meter. The application can find out the problem of pointer clamping stagnation in time.

Inventors

LIU BINTAO
YANG XIEWEI
XIE SHUIJIE
LIN ZHONGXIAN
HE HAOLIN
HUANG RUIBIN
HUANG CHUNZI
SONG KAI
HUANG QIAN
XIAO JIANHUA
ZHENG WEIJIA
CHI XIAOJIA
LIU YU

Assignees

广东电网有限责任公司揭阳供电局

Dates

Publication Date: 20260508
Application Date: 20260114

Claims (11)

1. The detection circuit of the lightning arrester leakage current monitor comprises a first resistor, a discharge gap, a voltage stabilizing tube, a full-bridge rectification loop, a filter capacitor, a second resistor and a milliamp meter; one end of the first resistor is connected with the lightning arrester, and the other end of the first resistor is grounded through the discharge gap; one end of the voltage stabilizing tube is connected with the lightning arrester, and the other end of the voltage stabilizing tube is grounded; the first end of the full-bridge rectifying circuit is connected with the lightning arrester, the second end of the full-bridge rectifying circuit is connected to the third end of the full-bridge rectifying circuit through the second resistor and the milliamp meter in sequence, and the fourth end of the full-bridge rectifying circuit is grounded through the filter capacitor; 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 connected with the voltage stabilizing tube and the full-bridge rectifying loop in parallel; the second magnetic control reed switch is connected with the third resistor in series, and is connected with the second resistor in parallel between the filter capacitor and the milliamp meter; the first magnetic control reed switch is used for triggering the first magnetic control reed switch to be closed or opened under the action of magnetic force of the magnet so as to control the current of the milliampere meter; The second magnetic control reed switch is used for triggering the second magnetic control reed switch to be closed or opened under the action of the magnetic force so as to control the current of the milliampere meter.
2. The detection circuit of claim 1, further comprising an inductance connected in series between the second magnetically controlled reed and the third resistor for controlling a rate of increase of current flowing through the milliamp meter when the second magnetically controlled reed is closed, the inductance corresponding to the inductance being greater than the capacitance corresponding to the filter capacitance.
3. The detection circuit of claim 2, further comprising a control unit located in the arrester leakage current monitor, a power supply of the control unit, and a first relay and a second relay electrically connected to the control unit, respectively, wherein the control unit is communicatively connected to a terminal, a first contact of the first relay is connected in parallel with the second magnetic reed switch, and a second contact of the second relay is connected in parallel with the first magnetic reed switch, wherein: The control unit is used for responding to a first instruction sent by a receiving terminal, controlling the first contact to be closed through the first relay, enabling the charge stored by the filter capacitor to be released through the third resistor, enabling the current flowing through the milliamp meter to be increased, enabling the pointer of the milliamp meter to swing from the current pointer position to the maximum range position, responding to a second instruction sent by the receiving terminal, controlling the first contact to be opened through the first relay, enabling the pointer of the milliamp meter to swing from the maximum range position to the current pointer position, responding to a third instruction sent by the receiving terminal, controlling the second contact to be closed through the second relay, enabling the current flowing through the milliamp meter to be reduced, enabling the pointer of the milliamp meter to swing from the current pointer position to the zero position, and responding to a fourth instruction sent by the receiving terminal, controlling the second contact to be opened through the second relay, enabling the pointer of the meter to swing from the zero position to the current pointer position.
4. A detection circuit according to any one of claims 1 to 3, wherein the pointer of the milliamp meter swings from a current pointer position to a zero position for indicating that the pointer is operating normally if the first magnetic reed pipe senses the magnetic force to be closed, wherein the pointer of the milliamp meter does not swing from the current pointer position to the zero position for indicating that the pointer is operating abnormally if the first magnetic reed pipe senses the magnetic force to be closed, wherein the pointer of the milliamp meter swings from the zero position to the current pointer position for indicating that the pointer is operating normally if the first magnetic reed pipe is disconnected from the magnetic force, and wherein the pointer of the milliamp meter does not swing from the zero position to the current pointer position for indicating that the pointer is operating abnormally if the first magnetic reed pipe is disconnected from the magnetic force.
5. A detection circuit according to any one of claims 1 to 3, wherein the pointer of the milliamp meter swings from a current pointer position to a maximum range position for indicating that the pointer is operating normally when the second magnetic reed pipe senses the magnetic force to be closed, wherein the pointer of the milliamp meter does not swing from the current pointer position to the maximum range position for indicating that the pointer is operating abnormally when the second magnetic reed pipe senses the magnetic force to be closed, wherein the pointer of the milliamp meter swings from the maximum range position to the current pointer position for indicating that the pointer is operating normally when the second magnetic reed pipe is disconnected from the magnetic force, and wherein the pointer of the milliamp meter does not swing from the maximum range position to the current pointer position for indicating that the pointer is operating abnormally when the second magnetic reed pipe is disconnected from the magnetic force.
6. A detection circuit according to any one of claims 1 to 3, wherein the first resistor is used for overcurrent protection of the lightning arrester leakage current monitor, the discharge gap is used for overvoltage protection of the lightning arrester leakage current monitor, the voltage regulator tube is used for keeping the voltage of the lightning arrester leakage current monitor within a preset range, the full-bridge rectifying circuit is used for converting alternating current obtained from the lightning arrester into direct current, the filter capacitor is used for conducting filtering processing on the direct current to obtain direct current after filtering processing, the second resistor is used for enabling current flowing through the milliammeter to not exceed the maximum range of the milliammeter, and the milliammeter is used for indicating the current value flowing through the milliammeter through a pointer.
7. A detection method of a lightning arrester leakage current monitor, characterized by being applied to a control unit in a detection circuit of the lightning arrester leakage current monitor according to claim 3, the detection method comprising: The method comprises the steps of receiving a first instruction sent by a terminal, controlling the first contact to be closed through the first relay, enabling charges stored by the filter capacitor to be released through the third resistor, increasing current flowing through the milliamp meter to enable a pointer of the milliamp meter to swing from a current pointer position to a maximum range position, and controlling the first contact to be opened through the first relay to enable the pointer of the milliamp meter to swing from the maximum range position to the current pointer position in response to receiving a second instruction sent by the terminal; In response to receiving a third instruction sent by the terminal, controlling the second contact to be closed through the second relay, so that the current flowing through the milliamp meter is reduced, and the pointer of the milliamp meter swings from the current pointer position to the zero position; and in response to receiving a fourth instruction sent by the terminal, controlling the second contact to be opened through the second relay so as to enable the pointer of the milliamp meter to swing from the zero position to the current pointer position.
8. A detection device of a lightning arrester leakage current monitor, characterized by a control unit applied in a detection circuit of the lightning arrester leakage current monitor according to claim 3, the detection device comprising: The first processing module is used for responding to a first instruction sent by the terminal, controlling the first contact to be closed through the first relay, enabling the charge stored by the filter capacitor to be released through the third resistor, increasing the current flowing through the milliamp meter to enable the pointer of the milliamp meter to swing from the current pointer position to the maximum range position, and responding to a second instruction sent by the terminal, controlling the first contact to be opened through the first relay to enable the pointer of the milliamp meter to swing from the maximum range position to the current pointer position; The second processing module is used for responding to a third instruction sent by the terminal, controlling the second contact to be closed through the second relay, enabling the current flowing through the milliamp meter to be reduced, enabling the pointer of the milliamp meter to swing from the current pointer position to the zero position, and responding to a fourth instruction sent by the terminal, controlling the second contact to be opened through the second relay, enabling the pointer of the milliamp meter to swing from the zero position to the current pointer position.
9. An electronic device comprising a processor and a memory communicatively coupled to the processor; The memory stores computer-executable instructions; the processor executes computer-executable instructions stored in the memory to implement the method of detecting a lightning arrester leakage current monitor according to claim 7.
10. A computer readable storage medium, wherein computer program instructions are stored in the computer readable storage medium, which when executed, implement the method for detecting a lightning arrester leakage current monitor according to claim 7.
11. A computer program product comprising a computer program, characterized in that the computer program, when executed, implements a method for detecting a leakage current monitor of an arrester according to claim 7.

Description

Detection circuit and detection method of lightning arrester leakage current monitor Technical Field The application relates to the technical field of lightning arresters, in particular to a detection circuit and a detection method of a lightning arrester leakage current monitor. Background Lightning arresters are important protection devices for protecting electrical power system equipment from lightning overvoltage and other transient overvoltage damage, including zinc oxide arresters. The leakage current of a lightning arrester, such as a zinc oxide lightning arrester, may be monitored by a lightning arrester leakage current monitor. In normal conditions, the resistance of the arrester is large, and the leakage current is for example a few milliamperes. At present, as the variation amplitude of the leakage current of the lightning arrester is small, the pointer of the leakage current monitor of the lightning arrester stays in a fixed area all the year round and is easy to be blocked, and hidden danger is brought to the operation of the lightning arrester. Therefore, there is a need for an effective detection circuit for detecting a lightning arrester leakage current monitor. Disclosure of Invention The application provides a detection circuit and a detection method of a lightning arrester leakage current monitor, which are used for effectively detecting a pointer of the lightning arrester leakage current monitor. In a first aspect, the application provides a detection circuit of an arrester leakage current monitor, wherein the arrester leakage current monitor comprises a first resistor, a discharge gap, a voltage stabilizing tube, a full-bridge rectification loop, a filter capacitor, a second resistor and a milliamp meter; one end of the first resistor is connected with the lightning arrester, and the other end of the first resistor is grounded through a discharge gap; one end of the voltage stabilizing tube is connected with the lightning arrester, and the other end of the voltage stabilizing tube is grounded; the first end of the full-bridge rectifying circuit is connected with the lightning arrester, the second end of the full-bridge rectifying circuit is connected to the third end of the full-bridge rectifying circuit through a second resistor and a milliamp meter in sequence, and the fourth end of the full-bridge rectifying circuit is grounded through a filter capacitor; the second magnetic control reed pipe is connected with the third resistor in series, is arranged between the filter capacitor and the milliamp meter, and is connected with the second resistor in parallel; The first magnetic control reed switch is used for triggering the first magnetic control reed switch to be closed or opened under the action of the magnetic force of the magnet so as to control the current of the milliampere meter; The second magnetic control reed switch is used for triggering the second magnetic control reed switch to be closed or opened under the action of magnetic force so as to control the current of the milliampere meter. Optionally, the detection circuit further comprises an inductor, the inductor is connected in series between the second magnetic control reed pipe and the third resistor, and is used for controlling the increasing rate of the current flowing through the milliampere meter when the second magnetic control reed pipe is closed, and the inductance corresponding to the inductor is larger than the capacitance corresponding to the filter capacitor. The detection circuit comprises a control unit, a power supply and a first relay, wherein the control unit is arranged in a lightning arrester leakage current monitor, the power supply and the first relay and the second relay are respectively electrically connected with the control unit, the control unit is in communication connection with a terminal, a first contact of the first relay is connected with a second magnetic control reed pipe in parallel, a second contact of the second relay is connected with the first magnetic control reed pipe in parallel, the control unit is used for controlling the first contact to be closed through the first relay in response to receiving a first instruction sent by the terminal, so that charges stored by a filter capacitor are released through a third resistor, current flowing through a milliamp meter is increased, a pointer of the milliamp meter swings to a maximum range position from a current pointer position through the first relay, and in response to receiving a second instruction sent by the terminal, the pointer of the milliamp meter swings to the current pointer position from the maximum range position through the first relay, in response to receiving the third instruction sent by the terminal, the second contact is controlled to be closed through the second relay, so that current flowing through the meter is reduced, and in response to receiving the pointer of the fourth instruction sent by the terminal, the po