CN117630537A - Device and method for monitoring lightning arrester in switch cabinet - Google Patents
Device and method for monitoring lightning arrester in switch cabinet Download PDFInfo
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- CN117630537A CN117630537A CN202311618266.8A CN202311618266A CN117630537A CN 117630537 A CN117630537 A CN 117630537A CN 202311618266 A CN202311618266 A CN 202311618266A CN 117630537 A CN117630537 A CN 117630537A
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 78
- 238000000034 method Methods 0.000 title claims abstract description 10
- 238000009413 insulation Methods 0.000 claims abstract description 12
- 238000004891 communication Methods 0.000 claims abstract description 6
- 230000005540 biological transmission Effects 0.000 claims description 13
- 238000012806 monitoring device Methods 0.000 claims description 10
- 238000002955 isolation Methods 0.000 claims description 9
- 238000006243 chemical reaction Methods 0.000 claims description 6
- QVFWZNCVPCJQOP-UHFFFAOYSA-N chloralodol Chemical group CC(O)(C)CC(C)OC(O)C(Cl)(Cl)Cl QVFWZNCVPCJQOP-UHFFFAOYSA-N 0.000 claims description 3
- 239000004020 conductor Substances 0.000 claims 1
- 230000002159 abnormal effect Effects 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 description 3
- 230000003993 interaction Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/17—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values giving an indication of the number of times this occurs, i.e. multi-channel analysers
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Abstract
The invention belongs to the technical field of lightning arrester monitoring, and particularly discloses a device and a method for monitoring a lightning arrester in a switch cabinet. Each lightning arrester is electrically connected with a monitoring acquisition module, each monitoring acquisition module is grounded, each monitoring acquisition module is electrically connected with a lightning arrester monitoring unit, and the lightning arrester monitoring units are in wireless communication with a terminal; the monitoring acquisition unit is used for acquiring leakage current state information and inputting the leakage current state information into the lightning arrester monitoring unit; the lightning arrester monitoring unit is used for judging the insulation state of the lightning arrester according to the leakage current state information and uploading the insulation state to the terminal. According to the invention, the monitoring and collecting module is arranged between the lightning arrester and the ground, and the collected leakage current state information is uploaded to the lightning arrester monitoring unit to monitor the leakage current in real time, so that the occurrence rate of the operation accident of the lightning arrester is found in time, and the operation personnel are informed when the equipment is abnormal, thereby avoiding further expansion of the accident.
Description
Technical Field
The invention belongs to the technical field of lightning arrester monitoring, and particularly relates to a device and a method for monitoring a lightning arrester in a switch cabinet.
Background
The electric lightning arrester is an electric appliance used for protecting various electric appliances in an electric power system from damage caused by lightning overvoltage, operation overvoltage and power frequency transient overvoltage impact. In the distribution network below 35kV, the cable terminal is connected with the lightning arrester.
At present, cable terminals below 35kV and lightning arresters are mostly installed in a switch cabinet, and can only be subjected to live test through infrared temperature measurement, ultrahigh frequency and ultrasonic test under the influence of installation environment conditions, and the lightning arresters in the switch cabinet can protect the cable terminals and circuit breakers and current transformers, so that elements in the switch cabinet can safely work during overvoltage or operation overvoltage. The leakage current of the cable terminal and the resistive current of the lightning arrester cannot be detected in a live mode; early faults of the cable terminal and the lightning arrester equipment are difficult to find, and the safety and the stability of the equipment are threatened.
In addition, due to the factors of the difference of the running environments, large day-night temperature difference of cable trenches in the station, unreasonable construction and the like, the insulation level of the switch equipment in the station is easily reduced, and the breakdown caused by large leakage current of the cable is possibly induced, so that the switch cabinet in the station is endangered. At present, equipment in a station is in fault, and humidity problems are mainly concerned, and the humidity in the cabinet is reduced by additionally installing a dehumidifying device. The method can effectively reduce the failure rate of the switch cabinet in the station, but has no good mode for on-line monitoring in China for equipment insulation reduction caused by acid corrosion, equipment stress and other reasons.
Disclosure of Invention
The invention aims to provide a device and a method for monitoring a lightning arrester in a switch cabinet, which are used for solving the technical problems that leakage current cannot be found in time when the existing lightning arrester fails, the leakage current is difficult to detect in an electrified mode, and the safe operation of equipment is threatened.
In order to achieve the above purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides a lightning arrester monitoring device in a switch cabinet, comprising a plurality of lightning arresters, wherein each lightning arrester is electrically connected with a monitoring acquisition module, each monitoring acquisition module is grounded, each monitoring acquisition module is electrically connected with a lightning arrester monitoring unit, and the lightning arrester monitoring units are in wireless communication with a terminal;
the monitoring acquisition unit is used for acquiring leakage current state information and inputting the leakage current state information into the lightning arrester monitoring unit;
the lightning arrester monitoring unit is used for comparing the leakage current state information with a preset value so as to judge the insulation state of the lightning arrester and uploading the insulation state to the terminal.
The invention further improves that: and a counter is arranged between each monitoring acquisition module and the ground.
The invention further improves that: and each lightning arrester is connected with a leakage current down-lead between the corresponding monitoring acquisition module.
The invention further improves that: the lightning arrester monitoring unit comprises a single-chip microcomputer circuit, a relay counting control circuit and a transmission circuit, wherein the relay counting control circuit is used for acquiring overvoltage signals, the single-chip microcomputer circuit is used for judging the insulation state of the lightning arrester according to the overvoltage signals, and the transmission circuit is used for uploading the insulation state to a terminal.
The invention further improves that: the lightning arrester monitoring unit also comprises a display circuit, and the display circuit is connected with the singlechip.
The invention further improves that: the lightning arrester monitoring unit further comprises a leakage current input rectifying circuit, the leakage current input rectifying circuit is used for acquiring leakage current and rectifying, and rectified leakage signals sequentially pass through the primary operational amplifier circuit, the secondary operational amplifier circuit, the tertiary operational amplifier circuit and the A/D conversion circuit to reach the single chip microcomputer circuit, and an operational amplifier control circuit is arranged between the single chip microcomputer circuit and the primary operational amplifier circuit.
The invention further improves that: the lightning arrester monitoring unit further comprises a relay power supply control circuit, the relay power supply control circuit is electrically connected with the single chip microcomputer circuit, the relay power supply control circuit is electrically connected with a charging circuit, the charging circuit is electrically connected with an isolation power supply circuit, and the isolation power supply circuit is electrically connected with the single chip microcomputer circuit.
The invention further improves that: the transmission circuit is a Lora transmission circuit.
The invention further improves that: the singlechip circuit is an ARM singlechip circuit.
In a second aspect, the invention provides a method for monitoring a lightning arrester in a switchgear, comprising the following steps:
when the lightning arrester fails, the monitoring and collecting module collects leakage current state information and inputs the leakage current state information into the lightning arrester monitoring unit, and if the leakage current state information is larger than or equal to a first preset value, an alarm is sent out, and the lightning arrester fails and is uploaded to the terminal.
Compared with the prior art, the invention at least comprises the following beneficial effects:
1. according to the invention, the monitoring and collecting module is arranged between the lightning arrester and the ground, and the collected leakage current state information is uploaded to the lightning arrester monitoring unit to monitor the leakage current in real time, so that the occurrence rate of the operation accident of the lightning arrester is found in time, and an operator is informed when the equipment is abnormal, so that the accident is prevented from being further enlarged;
2. according to the invention, the leakage current is used for supplying power to the lightning arrester monitoring unit by arranging the charging circuit, so that energy is saved;
3. according to the invention, the man-machine interaction is improved by arranging the display module.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention.
In the drawings:
fig. 1 is a schematic structural view of a lightning arrester monitoring device in a switchgear according to the present invention;
FIG. 2 is a block diagram of a surge arrester monitoring unit in a surge arrester monitoring device in a switchgear according to the present invention;
in the figure: a lightning arrester 1; leakage current down-lead 2; a monitoring acquisition module 3; a counter 4; and an arrester monitoring unit 5.
Detailed Description
The invention will be described in detail below with reference to the drawings in connection with embodiments. It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
The following detailed description is exemplary and is intended to provide further details of the invention. Unless defined otherwise, all technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the invention.
Example 1
The lightning arrester monitoring device in the switch cabinet comprises a plurality of lightning arresters 1, wherein each lightning arrester 1 is electrically connected with a monitoring acquisition module 3 through a leakage current down-lead 2, each monitoring acquisition module 3 is electrically connected with a counter 4, each counter 4 is grounded, each monitoring acquisition module 3 is electrically connected with a lightning arrester monitoring unit 5, and the lightning arrester monitoring unit 5 is in wireless communication with a terminal;
specifically, the lightning arrester in the power system is always in a charged state.
Specifically, three lightning arresters 1 are in a group, each of the three-phase circuits is provided with a lightning arrester, when the lightning arrester 1 is in electric leakage, the lightning arrester 1 enters the monitoring and collecting module 3 through the leakage current down-lead 2, the monitoring and collecting module 3 collects electric leakage information and uploads the electric leakage information to the lightning arrester monitoring unit 5, meanwhile, the counter 4 is added, and the lightning arrester monitoring unit 5 judges the electric leakage reason according to the electric leakage information and uploads the electric leakage information to the terminal through wireless communication.
Specifically, the lightning arrester monitoring unit 5 is composed of a plurality of lightning arrester monitoring units;
specifically, as shown in fig. 2, the lightning arrester monitoring unit 5 includes a single chip microcomputer circuit, a relay counting control circuit, a relay power supply control circuit, a charging circuit, an isolation power supply circuit, a transmission circuit, a display circuit, a leakage current input rectifying circuit, an operational amplifier control circuit, a primary operational amplifier circuit, a secondary operational amplifier circuit, a tertiary operational amplifier circuit and an a/D conversion circuit;
the relay counting control circuit is electrically connected with the singlechip circuit, so that an overvoltage signal is uploaded to the singlechip circuit, a leakage current is input into the rectifying circuit for acquiring leakage current and rectifying, and the rectified leakage signal is sequentially input into the primary operational amplifier circuit, the secondary operational amplifier circuit, the tertiary operational amplifier circuit and the A/D conversion circuit for signal processing and uploading to the singlechip circuit;
the single-chip microcomputer circuit is electrically connected with the operational amplifier control circuit, the operational amplifier control circuit is electrically connected with the primary operational amplifier circuit, and when the single-chip microcomputer circuit acquires leakage information, the operational amplifier control circuit controls the primary operational amplifier circuit to start working;
the singlechip circuit is electrically connected with the display circuit, so that man-machine interaction is realized, and leakage current or voltage and other data are displayed, so that the display circuit is convenient to check;
the singlechip circuit is electrically connected with the transmission circuit, and the transmission circuit is used for carrying out data communication with the terminal;
the single-chip microcomputer circuit is further electrically connected with the relay power supply control circuit, the relay power supply control circuit is electrically connected with the charging circuit, the charging circuit is electrically connected with the isolation power supply circuit, the isolation power supply circuit is electrically connected with the single-chip microcomputer circuit, the relay power supply control circuit is controlled through the single-chip microcomputer, the obtained leakage current is conveyed to the charging circuit to be charged, and the charging circuit supplies power to the lightning arrester monitoring unit 5 through the isolation power supply circuit after the charging circuit is charged.
Specifically, the primary operational amplifier circuit is used for signal isolation, the secondary operational amplifier circuit is used for signal method, the tertiary operational amplifier circuit is used for analog-to-digital conversion, and the A/D conversion circuit is used for signal calculation.
Specifically, the singlechip circuit is an ARM singlechip circuit, and the transmission circuit is a Lora transmission circuit;
specifically, the lightning arrester 1 uses a plurality of strands of copper core wires with proper wire diameters to ground the lightning arrester base, a current transformer with shielding high sensitivity is additionally arranged on the wiring of the lightning arrester, and then the current transformer with shielding high sensitivity is led into a ground monitoring box through a shielding wire.
Example 2
A method for monitoring a lightning arrester in a switchgear, comprising the steps of:
the monitoring and collecting module 3 collects the leakage current state information and inputs the leakage current state information into the lightning arrester monitoring unit 5, and if the leakage current state information is larger than or equal to a first preset value at the moment, a first alarm signal is sent to the terminal;
after receiving the first alarm signal, the terminal informs an operator on duty to shorten the inspection period of the lightning arrester; if necessary, the power failure is checked.
If the leakage current state information is greater than or equal to a second preset value, a second alarm signal is sent to the terminal;
when the terminal receives the second alarm signal, the terminal immediately reports to the operation and maintenance overhauling part to apply for power failure, and staff is dispatched to carry out power failure overhauling test on the group of lightning arresters.
Specifically, the first preset value is 1.5 times of the average value of the leakage current historical data;
the second preset value is 2 times of the average value of the leakage current history data.
It will be appreciated by those skilled in the art that the present invention can be carried out in other embodiments without departing from the spirit or essential characteristics thereof. Accordingly, the above disclosed embodiments are illustrative in all respects, and not exclusive. All changes that come within the scope of the invention or equivalents thereto are intended to be embraced therein.
Finally, it should be noted that: the above embodiments are only for illustrating the technical aspects of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the invention without departing from the spirit and scope of the invention, which is intended to be covered by the claims.
Claims (10)
1. The lightning arrester monitoring device in the switch cabinet is characterized by comprising a plurality of lightning arresters (1), wherein each lightning arrester (1) is electrically connected with one monitoring acquisition module (3), each monitoring acquisition module (3) is grounded, each monitoring acquisition module (3) is electrically connected with a lightning arrester monitoring unit (5), and the lightning arrester monitoring unit (5) is in wireless communication with a terminal;
the monitoring acquisition unit (3) is used for acquiring leakage current state information and inputting the leakage current state information into the lightning arrester monitoring unit (5);
the lightning arrester monitoring unit (5) is used for comparing the leakage current state information with a preset value so as to judge the insulation state of the lightning arrester and uploading the insulation state to the terminal.
2. A switchgear arrester monitoring device according to claim 1, characterized in that a counter (4) is arranged between each of the monitoring acquisition modules (3) and ground.
3. A switchgear internal arrester monitoring device according to claim 1, characterized in that each arrester (1) is connected to the corresponding monitoring acquisition module (3) by means of a leakage current down-conductor (2).
4. The device for monitoring the lightning arrester in the switch cabinet according to claim 1, wherein the lightning arrester monitoring unit (5) comprises a single-chip microcomputer circuit, a relay counting control circuit and a transmission circuit, the relay counting control circuit is used for acquiring an overvoltage signal, the single-chip microcomputer circuit is used for judging the insulation state of the lightning arrester according to the overvoltage signal, and the transmission circuit is used for uploading the insulation state to a terminal.
5. The device for monitoring the lightning arrester in the switch cabinet according to claim 4, wherein the lightning arrester monitoring unit (5) further comprises a display circuit, and the display circuit is connected with the single-chip circuit.
6. The lightning arrester monitoring device in the switch cabinet according to claim 4, wherein the lightning arrester monitoring unit (5) further comprises a leakage current input rectifying circuit, the leakage current input rectifying circuit is used for acquiring leakage current and rectifying, the rectified leakage signal sequentially passes through a primary operational amplifier circuit, a secondary operational amplifier circuit, a tertiary operational amplifier circuit and an A/D conversion circuit to reach a single chip microcomputer circuit, and an operational amplifier control circuit is arranged between the single chip microcomputer circuit and the primary operational amplifier circuit.
7. The lightning arrester monitoring device in a switch cabinet according to claim 4, wherein the lightning arrester monitoring unit (5) further comprises a relay power supply control circuit, the relay power supply control circuit is electrically connected with the single-chip microcomputer circuit, the relay power supply control circuit is electrically connected with a charging circuit, the charging circuit is electrically connected with an isolation power supply circuit, and the isolation power supply circuit is electrically connected with the single-chip microcomputer circuit.
8. The in-switchgear arrester monitoring device of claim 4 wherein the transmission circuit is a Lora transmission circuit.
9. The device for monitoring the lightning arrester in a switch cabinet according to claim 4, wherein the single-chip microcomputer circuit is an ARM single-chip microcomputer circuit.
10. A method for monitoring a lightning arrester in a switchgear, comprising the steps of:
the monitoring and collecting module (3) collects leakage current state information and inputs the leakage current state information into the lightning arrester monitoring unit (5), and if the leakage current state information is larger than or equal to a first preset value, an alarm is sent out, and the lightning arrester faults are uploaded to the terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311618266.8A CN117630537A (en) | 2023-11-29 | 2023-11-29 | Device and method for monitoring lightning arrester in switch cabinet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311618266.8A CN117630537A (en) | 2023-11-29 | 2023-11-29 | Device and method for monitoring lightning arrester in switch cabinet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117630537A true CN117630537A (en) | 2024-03-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311618266.8A Pending CN117630537A (en) | 2023-11-29 | 2023-11-29 | Device and method for monitoring lightning arrester in switch cabinet |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117630537A (en) |
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- 2023-11-29 CN CN202311618266.8A patent/CN117630537A/en active Pending
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