CN112578311A - Lightning arrester leakage current detection device and method - Google Patents
Lightning arrester leakage current detection device and method Download PDFInfo
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- CN112578311A CN112578311A CN202011382332.2A CN202011382332A CN112578311A CN 112578311 A CN112578311 A CN 112578311A CN 202011382332 A CN202011382332 A CN 202011382332A CN 112578311 A CN112578311 A CN 112578311A
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- 238000001514 detection method Methods 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 10
- 238000012806 monitoring device Methods 0.000 claims abstract description 12
- 230000005540 biological transmission Effects 0.000 claims description 11
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 2
- 229910052744 lithium Inorganic materials 0.000 claims description 2
- 238000011897 real-time detection Methods 0.000 abstract 1
- 238000012544 monitoring process Methods 0.000 description 7
- 238000012423 maintenance Methods 0.000 description 6
- 230000007613 environmental effect Effects 0.000 description 3
- 238000007689 inspection Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000016507 interphase Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 208000025274 Lightning injury Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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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
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16571—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing AC or DC current with one threshold, e.g. load current, over-current, surge current or fault current
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- Engineering & Computer Science (AREA)
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Abstract
The invention discloses a device and a method for detecting leakage current of a lightning arrester, wherein the device comprises the following steps: the system comprises a full current detection device, a video monitoring device and a terminal; the full current detection device is connected with the cable terminal and the lightning arrester through a connecting wire and displays the detected full current value; the video monitoring device shoots a full current value display graph of the current detection device; and the terminal identifies the full current value in the full current value display graph and judges the current leakage state of the lightning arrester according to the comparison result of the preset threshold value and the full current value. Through carrying out real-time detection and control to the electric current between cable termination and arrester, judge the arrester according to the size of full current value and reveal the electric current condition, effectively judge arrester equipment running state, improve cable operation reliability, promote the efficiency of patrolling and examining of fortune dimension personnel to cable termination.
Description
Technical Field
The invention relates to the technical field of on-line monitoring of power equipment, in particular to a lightning arrester leakage current detection device and method.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
In recent years, along with the continuous development and growth of urbanization, the popularization rate of power transmission of power cables in cities is higher and higher, and due to the fact that the insulation distance between cable cores is small, the occupied space and the used land can be reduced, the power cables are not easily affected by external environments such as strong wind, lightning stroke, dirt, foreign body short circuit and the like, and the power supply reliability is greatly improved; however, the internal structure of the cable is complex, so that once the cable fails, great loss is easily caused, and the safety of a power grid is seriously threatened.
The inventor finds that high labor cost exists in the detection of the operation state of the lightning arrester through regular or irregular manual daily operation maintenance and routing inspection, and the interval time period of two routing inspections cannot generally know the real-time operation state so that necessary early warning information cannot be obtained in time before a fault occurs; in addition, after equipment such as a lightning arrester breaks down, the disassembly and replacement work period and the power failure maintenance period are long, so that great loss is easily caused, and the safety of a power grid is seriously threatened.
Disclosure of Invention
In order to solve the problems, the invention provides a lightning arrester leakage current detection device and a lightning arrester leakage current detection method.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the present invention provides an arrester leakage current detection apparatus, including: the system comprises a full current detection device, a video monitoring device and a terminal;
the full current detection device is connected with the cable terminal and the lightning arrester through a connecting wire and displays the detected full current value;
the video monitoring device shoots a full current value display graph of the current detection device;
and the terminal identifies the full current value in the full current value display graph and judges the current leakage state of the lightning arrester according to the comparison result of the preset threshold value and the full current value.
In a second aspect, the present invention provides a method for detecting a leakage current of an arrester, including:
displaying the detected full current value between the cable terminal and the lightning arrester;
and acquiring a full current value display graph, identifying to obtain a full current value, and judging the current leakage state of the lightning arrester according to the comparison result of the preset threshold value and the full current value.
Compared with the prior art, the invention has the beneficial effects that:
the lightning arrester leakage current detection device provided by the invention can realize real-time monitoring of the leakage current value of the lightning arrester, intelligently judges the running state of the lightning arrester equipment according to the leakage current value, automatically alarms if the leakage current value exceeds a threshold value, and pushes alarm information so as to take effective measures in time, improve the running reliability of a cable and improve the inspection efficiency of operation and maintenance personnel on the cable terminal.
The invention can detect the alternating current continuous current of the lightning arrester under the condition of no power failure, and because the lightning arrester is influenced by adjacent interphase capacitive coupling under the condition of electrified operation, the resistive current of the lightning arrester is difficult to detect accurately, and the component size of the alternating current continuous current is difficult to detect, the invention simulates the resistive current variation by the total current variation, takes the total current value as a reference quantity, transmits the detected total current data to the application terminal in real time according to the requirement, and judges whether the operation state of the equipment is normal or not by the application terminal according to the total current value.
The invention solves the problem that the alternating current continuous current of the lightning arrester can not be measured in an electrified way in the prior art, realizes the real-time monitoring of the alternating current continuous current data of the lightning arrester under the electrified condition, and effectively solves the problems of difficult field monitoring, long power failure overhaul period and the like.
Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
Fig. 1 is a schematic structural diagram of an arrester leakage current detection device provided in embodiment 1 of the present invention.
The specific implementation mode is as follows:
the invention is further described with reference to the following figures and examples.
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and it should be understood that the terms "comprises" and "comprising", and any variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
Example 1
The embodiment provides a lightning arrester leakage current detection device, which is used for detecting alternating continuous current of a lightning arrester, judging the running state of the lightning arrester according to the size of the alternating continuous current and obtaining the current leakage degree of the lightning arrester, so that effective measures are taken to avoid accidents, the running reliability of a cable is improved, and the safe running of a power grid is ensured;
as shown in fig. 1, the apparatus specifically includes: the system comprises a full current detection device, a video monitoring device and a terminal;
the full current detection device is connected with the cable terminal and the lightning arrester through a connecting wire and displays the detected full current value;
the video monitoring device shoots a full current value display graph of the current detection device;
and the terminal identifies the full current value in the full current value display graph and judges the current leakage state of the lightning arrester according to the comparison result of the preset threshold value and the full current value.
In this embodiment, the alternating continuous current includes resistive current and capacitive current, and normally, the main current flowing through the arrester is capacitive current, the resistive current occupies a very small part, about 10% to 20%, and the arrester is affected by adjacent interphase capacitive coupling under a live operation condition, and the resistive current is difficult to measure accurately and the component size is difficult to detect, so that the embodiment simulates resistive current variation by full current variation; and (3) taking the full current value as a reference quantity, transmitting the detected full current value to an application terminal in real time according to the requirement, and judging whether the running state of the equipment is normal or not by the application terminal according to the full current value.
In this embodiment, the full current detection device adopts a microammeter, the microammeter is connected in series to the cable terminal and the lightning arrester, and real-time data is displayed according to an alternating continuous current value;
preferably, the microammeter is a high-precision microammeter and has the characteristics of high detection sensitivity, low power consumption and the like.
In this embodiment, the video surveillance device is installed on the cable terminal tower, and the data displayed by the full current detection device is shot by setting a shooting time interval at a preset safe distance and a shooting angle;
preferably, the terminal can also control the live snapshot or shooting video to be sent to the terminal.
In the embodiment, a full current value picture shot by a video monitoring device is transmitted to a terminal through a wireless transmission module, the magnitude of a current value in the full current value picture is compared with an initial value, monitoring of a lightning arrester is enhanced when the current is obviously increased, meanwhile, environmental meteorological factors of the initial value and a measured value are taken into consideration, and line operation and maintenance personnel can browse picture data through a computer client or a mobile phone client, so that the operation and maintenance personnel can conveniently master the magnitude of an alternating continuous current value of a high-voltage cable terminal at any time and any place;
preferably, the wireless transmission module comprises a 4G transmission module or a 5G transmission module, has the characteristics of high transmission speed, strong anti-interference capability, stable and reliable communication and the like, is suitable for a strong electromagnetic environment, and is not easily influenced by external environmental factors.
Preferably, the video monitoring device adopts a power supply mode of an 18V/35W solar panel and a lithium battery, and can realize continuous power supply.
In this embodiment, the terminal assists in judging the operating state of the lightning arrester device according to the magnitude of the full current, and through comparison between a preset threshold and the magnitude of the full current, if the full current exceeds the threshold, the terminal automatically gives an alarm and pushes alarm information, so that real-time transmission and monitoring of leakage current data are comprehensively realized, a related maintenance strategy is timely formulated, and the power supply reliability and safety of a power grid are improved.
In the present embodiment, the following example is given, according to the 110kV arrester direct current I in dry weather conditions1mASetting a rated current attention value of 1mA according to a lower reference voltage value and a leakage value under 0.75 time of reference voltage, judging the running state of the equipment according to the detected full current value, and generally classifying the equipment into a normal state with 1 grade as a general hidden danger, 2 grade as a serious hidden danger and 3 grade as a normal state; under normal conditions, the continuous current flowing through the lightning arrester is very small, once the interior of the lightning arrester is affected with damp, the current flowing through the microampere meter can be increased to several milliamperes or dozens of milliamperes, so that three-phase transverse comparison is carried out, whether the current is caused by external environmental factors is judged, if the leakage current is obviously different, the lightning arrester is considered to be lightning-arrestedThe device has a defect.
In further embodiments, there is also provided:
an arrester leakage current detection method, which adopts the arrester leakage current detection device described in embodiment 1, specifically includes:
displaying the detected full current value between the cable terminal and the lightning arrester;
and acquiring a full current value display graph, identifying to obtain a full current value, and judging the current leakage state of the lightning arrester according to the comparison result of the preset threshold value and the full current value.
The current value is revealed to the real-time supervision arrester to this embodiment, realizes carrying out arrester alternating current continuous current data real-time supervision under the electrified condition, solves the problem that can't electrified measure arrester alternating current continuous current among the prior art, solves on-the-spot monitoring difficult, the power failure overhauls cycle length scheduling problem.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (10)
1. The utility model provides a lightning arrester leakage current detection device which characterized in that includes: the system comprises a full current detection device, a video monitoring device and a terminal;
the full current detection device is connected with the cable terminal and the lightning arrester through a connecting wire and displays the detected full current value;
the video monitoring device shoots a full current value display graph of the current detection device;
and the terminal identifies the full current value in the full current value display graph and judges the current leakage state of the lightning arrester according to the comparison result of the preset threshold value and the full current value.
2. An arrester leakage current detection device according to claim 1, characterized in that the full current value includes resistive current and capacitive current.
3. The apparatus for detecting leakage current of an arrester according to claim 1, wherein the full current detecting apparatus employs a microammeter, and the microammeter is connected in series between the cable termination and the arrester.
4. The apparatus for detecting leakage current of a lightning arrester according to claim 1, wherein the video surveillance device is installed on a cable terminal tower, and the full current value data displayed by the full current detection device is photographed at the set photographing time interval.
5. The arrester leakage current detection device according to claim 4, wherein a safety distance and a shooting angle are preset between the video monitoring device and the full current detection device, and shooting is performed at the safety distance and the shooting angle.
6. The arrester leakage current detection device according to claim 1, wherein the display of the full current value photographed by the video surveillance device is transmitted to a terminal through a wireless transmission module.
7. The arrester leakage current detection device of claim 6, wherein the wireless transmission module comprises a 4G transmission module or a 5G transmission module.
8. The lightning arrester leakage current detection device according to claim 1, wherein the video monitoring device adopts a solar panel and a lithium battery for double power supply.
9. The lightning arrester leakage current detection device according to claim 1, wherein in the comparison result between the preset threshold and the full current value, if the full current value exceeds the preset threshold, the terminal starts an alarm and pushes alarm information.
10. A method for detecting leakage current of an arrester is characterized by comprising the following steps:
displaying the detected full current value between the cable terminal and the lightning arrester;
and acquiring a full current value display graph, identifying to obtain a full current value, and judging the current leakage state of the lightning arrester according to the comparison result of the preset threshold value and the full current value.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011382332.2A CN112578311A (en) | 2020-12-01 | 2020-12-01 | Lightning arrester leakage current detection device and method |
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| CN202011382332.2A CN112578311A (en) | 2020-12-01 | 2020-12-01 | Lightning arrester leakage current detection device and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113610830A (en) * | 2021-08-18 | 2021-11-05 | 常州领创电气科技有限公司 | Detection system and method for lightning arrester |
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