CN104007310A - Leakage current detection method for zinc oxide arrester - Google Patents

Leakage current detection method for zinc oxide arrester Download PDF

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Publication number
CN104007310A
CN104007310A CN201410246891.9A CN201410246891A CN104007310A CN 104007310 A CN104007310 A CN 104007310A CN 201410246891 A CN201410246891 A CN 201410246891A CN 104007310 A CN104007310 A CN 104007310A
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China
Prior art keywords
lightning arrester
arrester
leakage current
subsequent use
capacitor
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CN201410246891.9A
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Chinese (zh)
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CN104007310B (en
Inventor
乔铁柱
王旭东
郑补祥
王�琦
杨德
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Taiyuan University of Technology
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Taiyuan University of Technology
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Abstract

The invention discloses a leakage current detection method for a zinc oxide arrester, and belongs to the field of electrical equipment monitoring. According to the technical scheme, the leakage current detection method for the zinc oxide arrester is characterized in that a device formed by connecting a standby arrester with a sampling resistor branch circuit in parallel for detecting the leakage current of the arrester, wherein the sampling resistor branch is composed of a sampling resistor, an ampere meter, a capacitor and a fuse. The leakage current detection method for the zinc oxide arrester has the advantages that installation is easy, the cost is low, the application range is wide, precision is high, no external power supply devices are needed, no adverse effects on normal working of an original arrester are caused, and the standby function of the arrester is achieved; when the original arrester cannot work normally, the standby arrester begins to work, and the working life of the arrester is prolonged in another way.

Description

A kind of Leakage Current of Zinc-oxide Lightning Arresters detection method
Technical field
A kind of Leakage Current of Zinc-oxide Lightning Arresters detection method of the present invention, belongs to power equipment monitoring field, is specifically related to a kind of technical scheme of the detection method to leakage current of an arrester.
Background technology
Due to the various advantages of electric energy, electric energy has been used to the every aspect of life.The normal operation of electric system, plays an important role to national economy.Overvoltage protection is the important way that ensures safe operation of power system.Lightning arrester, as a kind of overvoltage protection equipment, can prevent switching overvoltage, can prevent again lightning surge.In electrical network, as a kind of overvoltage protection equipment, lightning arrester has been used to electrical network various piece, as transformer, and high voltage transmission line, the ground such as transformer station.Nowadays, what lightning arrester all adopted is gapless metal-oxide lighting arrester, because its long-term work is under power-frequency voltage, and be operated in outdoorly more, be easily subject to the impact of sleet hardships, make the zinc oxide valve plate of lightning arrester easily moist, aging, cause the rising of leakage current of an arrester, the rising of leakage current, can cause the increase of lightning arrester thermal value, the increase of lightning arrester thermal value, can cause again the aging quickening of lightning arrester, finally cause lightning arrester to damage due to overheated, when serious, even blast.If can not find in time the aging conditions of lightning arrester, maintenance is with changing, and when thunderbolt occurs, the lightning function of lightning arrester is affected, and will cause large-area power-cuts, even jeopardizes people's life security.
Existing arrester on-line monitoring system, adopts current sensor to detect the leakage current of lightning arrester, to reach the effect that does not affect former lightning arrester circuit more.But a little less than this mode antijamming capability, testing result out of true.
Summary of the invention
A kind of Leakage Current of Zinc-oxide Lightning Arresters detection method of the present invention, so object is overcoming the deficiency of existing leakage current of an arrester detection technique, open a kind of anti-interference, without using externally fed equipment, realize the function of lightning arrester for subsequent use, the technical scheme of the accurate leakage current of an arrester detection method of testing result.
A kind of Leakage Current of Zinc-oxide Lightning Arresters detection method of the present invention, it is characterized in that the method that device that sampling resistor branch that a kind of utilization forms by lightning arrester for subsequent use with by sampling resistor, reometer, capacitor and fuse is formed in parallel carries out leakage current of an arrester detection, the concrete measured step of the method is suddenly as follows:
1) select for subsequent use lightning arrester identical with former Zinc-Oxide Arrester model, selecting resistance is that 1 conventional, electric-resistance is sampling resistor, and the reometer that selected range is 10mA, selects high voltage bearing capacitor, and selecting fusing value is the fuse of 2mA;
2) by sampling branch road in series to sampling resistor selected step 1), reometer, capacitor and resistance wire;
3) again by step 2) lightning arrester for subsequent use selected with step 1) of the sampling branch road that forms is in parallel, forms leakage current table of the present invention;
4) leakage current table step 3) being formed is serially connected on the ground wire of lightning arrester; Realize the leakage current detection of lightning arrester and the standby functions of lightning arrester;
5) according to the characteristic of the principle of parallel circuit and capacitor, in the time that lightning arrester is normally worked, leakage current is all by step 2) the sampling branch road that forms, reometer is measured the leakage current of lightning arrester described in step 1), has realized the function that leakage current of an arrester detects described in step 4);
6) described in step 1), the voltage breakdown of capacitor exceedes the threshold values of the selected lightning arrester for subsequent use of step 1), and in the time that superpotential occurs, the discharge current of the lightning arrester lightning arrester for subsequent use described in step 1) of flowing through, flows into the earth;
7), in the time that lightning arrester reaches replacing condition, flow through the electric current of fuse described in step 1) and reach the fusing value of fuse, blown fuse, the lightning arrester for subsequent use described in step 1) is started working, performing step 4) standby functions of described lightning arrester.
A kind of Leakage Current of Zinc-oxide Lightning Arresters detection method of the present invention, so its advantage exists: install simple, cost is low, applied widely, and degree of accuracy is high, without using externally fed equipment, normal work to former lightning arrester has no adverse effect, and has realized the standby functions of lightning arrester, in the time that former lightning arrester cannot normally be worked, lightning arrester for subsequent use is started working, and has in a disguised form extended the mission life of lightning arrester.
Brief description of the drawings
Accompanying drawing 1 is the scheme of installation of leakage current of an arrester detection method of the present invention.
Accompanying drawing 2 is cut-away views of leakage current table of the present invention.
In Fig. 1: 1-high-pressure side; 2-lightning arrester; 3-leakage current table; 4-earth terminal.
In Fig. 2: 1-lightning arrester for subsequent use; 2-sampling resistor; 3-reometer; 4-capacitor; 5-fuse.
Embodiment
Below in conjunction with accompanying drawing and method step content of the present invention, further illustrate architectural feature and the feature thereof of the detection method of leakage current of an arrester of the present invention.
1) select for subsequent use lightning arrester identical with former Zinc-Oxide Arrester model, selecting resistance is that 1 conventional, electric-resistance is sampling resistor, and the high sensitivity reometer that selected range is 10mA, selects high voltage bearing capacitor, and selecting fusing value is the fuse of 2mA;
2) by sampling branch road in series to sampling resistor selected step 1), reometer, capacitor and resistance wire;
3) again by step 2) lightning arrester for subsequent use selected with step 1) of the sampling branch road that forms is in parallel, forms leakage current table of the present invention;
4) leakage current table step 3) being formed is serially connected on the ground wire of lightning arrester; Due to the special inner structure of leakage current, can not impact former lightning arrester circuit, and realize the leakage current detection of lightning arrester and the standby functions of lightning arrester;
5) according to " logical high frequency; resistance low frequency " characteristic of " shunting in parallel " principle of parallel circuit and capacitor, in the time that lightning arrester is normally worked, the leakage current of lightning arrester is all by step 2) the sampling branch road that forms, described in step 1), reometer is measured the leakage current of lightning arrester, has realized the function that leakage current of an arrester detects described in step 4);
6) described in step 1), the voltage breakdown of capacitor exceedes the threshold values of the selected lightning arrester for subsequent use of step 1), in the time that superpotential occurs, lightning arrester for subsequent use has precedence over capacitor conducting, and the discharge current of the lightning arrester lightning arrester for subsequent use described in step 1) of flowing through, flows into the earth;
7) in the time that lightning arrester reaches replacing condition, leakage current increases to 2mA, flow through the fusing value that the electric current of fuse described in step 1) reaches fuse, blown fuse, sampling branch road disconnects, lightning arrester for subsequent use described in step 1) is started working, and connects form new lightning arrester, performing step 4 with former lightning arrester) standby functions of described lightning arrester.
Fig. 1 is scheme of installation of the present invention.As shown in Figure 1, reometer of the present invention is serially connected in the ground wire of lightning arrester.
Detect as example taking the leakage current of an arrester under 220kV.
When lightning arrester is normally worked, leakage current is 1mA.In the time that the leakage current of lightning arrester exceedes 2mA, lightning arrester must be in time with changing.
As shown in Figure 2, lightning arrester 1 for subsequent use is identical with former lightning arrester model, and internal resistance is 220M.Sampling resistor 2 is that resistance is 1 conventional, electric-resistance, and reometer 3 is that range is the common current table of 10mA, and capacitor 4 is a high-voltage capacitance and the alternating current of 50HZ hindered to ability and can ignore, and the fusing current of fuse 5 is 2mA.
In the time that lightning arrester is normally worked, the reometer 3 of leakage current table inside is measured the leakage current of lightning arrester.The leakage current of lightning arrester is by sampling branch road, and capacitor 4 is equivalent to wire, and the fusing current of fuse 5 exceedes the normal leakage electric current of lightning arrester.Reometer 3 demonstrates the size of current that flows through sampling resistor, and the electric current that flows through sampling resistor is the leakage current of lightning arrester.In the time having Lightning Over-voltage or switching overvoltage to occur, under this superpotential, lightning arrester is in low resistive state, and the voltage breakdown of the capacitor 4 of leakage current table inside is far above the threshold values of lightning arrester 1 for subsequent use, and lightning arrester 1 for subsequent use is prior to capacitor 4 conductings.Discharge current, by the lightning arrester for subsequent use 1 of lightning arrester and leakage current table, flows into the earth.
In the time that the leakage current of lightning arrester exceedes 2mA, lightning arrester needs in time with changing.The fuse 5 of leakage current table inside fuses, and sampling branch road disconnects.Lightning arrester 1 for subsequent use is connected with former lightning arrester, has formed new lightning arrester.Observe according to experiment, utilize this leakage current table to detect leakage current of an arrester, when former lightning arrester is aging while needing to change, lightning arrester for subsequent use 1 can continue normally to work more than 1 year with the new lightning arrester of former lightning arrester composition, has greatly alleviated the urgent degree of changing lightning arrester of following.
The feature of leakage current of an arrester detection method of the present invention is the standby functions that has realized lightning arrester.Utilize the shunting principle of parallel circuit, the characteristic of the pressure-sensitive character of metal oxide and capacitor itself, in the time that lightning arrester is normally worked, little leakage current flows through sampling branch road, realizes the detection of leakage current of an arrester; In the time of lightning arrester discharge, large discharge current, by lightning arrester for subsequent use, does not affect the lightning function of former lightning arrester; When former lightning arrester reaches with changing condition, but staff is because some reason cannot be when changing this lightning arrester, and the lightning arrester for subsequent use new lightning arrester of formation of connecting with former lightning arrester, has continued normal lightning arrester function and reached more than 1 year.Avoid because of the loss causing of even exploding of former lightning arrester serious aging.When staff is with having changed after former lightning arrester, reinstall the fuse of leakage current table inside, leakage current table recovers to detect the function of electric current.Leakage current table of the present invention internal resistance, lower than 1, can not impact the resistance of arrester ground line.Measurement result is accurate, there is no error.
Above example, has simplified partial data and calculating, and object is that technical scheme of the present invention and function are better described.
In the time being applied to the leakage current of an arrester detection of other electric pressure, can be according to condition, the sampling resistor that suitable selection is suitable, capacitor, fuse is to reach optimum efficiency.

Claims (1)

1. a Leakage Current of Zinc-oxide Lightning Arresters detection method, it is characterized in that the method that device that sampling resistor branch that a kind of utilization forms by lightning arrester for subsequent use with by sampling resistor, reometer, capacitor and fuse is formed in parallel carries out leakage current of an arrester detection, the concrete measured step of the method is suddenly as follows:
1) select for subsequent use lightning arrester identical with former Zinc-Oxide Arrester model, selecting resistance is that 1 conventional, electric-resistance is sampling resistor, and the reometer that selected range is 10mA, selects high voltage bearing capacitor, and selecting fusing value is the fuse of 2mA;
2) by sampling resistor branch in series to sampling resistor selected step 1), reometer, capacitor and resistance wire;
3) again by step 2) lightning arrester for subsequent use selected with step 1) of the sampling branch road that forms is in parallel, forms leakage current table of the present invention;
4) leakage current table step 3) being formed is serially connected on the ground wire of lightning arrester; Realize the leakage current detection of lightning arrester and the standby functions of lightning arrester;
5) according to the characteristic of the principle of parallel circuit and capacitor, in the time that lightning arrester is normally worked, leakage current is all by step 2) the sampling branch road that forms, reometer is measured the leakage current of lightning arrester described in step 1), has realized the function that leakage current of an arrester detects described in step 4);
6) described in step 1), the voltage breakdown of capacitor exceedes the threshold values of the selected lightning arrester for subsequent use of step 1), and in the time that superpotential occurs, the discharge current of the lightning arrester lightning arrester for subsequent use described in step 1) of flowing through, flows into the earth;
7), in the time that lightning arrester reaches replacing condition, flow through the electric current of fuse described in step 1) and reach the fusing value of fuse, blown fuse, the lightning arrester for subsequent use described in step 1) is started working, performing step 4) standby functions of described lightning arrester.
CN201410246891.9A 2014-06-06 2014-06-06 A kind of Leakage Current of Zinc-oxide Lightning Arresters detection method Expired - Fee Related CN104007310B (en)

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Publication number Priority date Publication date Assignee Title
CN104297617A (en) * 2014-10-12 2015-01-21 胡智宏 Measuring transducer for leakage current of lightning arrester
CN107465178A (en) * 2017-08-17 2017-12-12 国家电网公司 Automatic fusing type direct current arrester group
CN115097168A (en) * 2022-06-23 2022-09-23 国网湖北省电力有限公司宜昌供电公司 Multifunctional wiring device for live-line test of lightning arrester

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CN2594803Y (en) * 2002-12-11 2003-12-24 武汉恒安电气有限责任公司 Extending board tray for testing electric circuit boards
WO2006062168A1 (en) * 2004-12-10 2006-06-15 Japan Ae Power Systems Corporation Arrestor and method of measuring leakage current of arrestor
CN1991395A (en) * 2005-12-29 2007-07-04 上海电气集团股份有限公司 Method for monitoring resistant current in leakage current of an arrester
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104297617A (en) * 2014-10-12 2015-01-21 胡智宏 Measuring transducer for leakage current of lightning arrester
CN107465178A (en) * 2017-08-17 2017-12-12 国家电网公司 Automatic fusing type direct current arrester group
CN115097168A (en) * 2022-06-23 2022-09-23 国网湖北省电力有限公司宜昌供电公司 Multifunctional wiring device for live-line test of lightning arrester
CN115097168B (en) * 2022-06-23 2023-10-31 国网湖北省电力有限公司宜昌供电公司 Multifunctional wiring device for live test of lightning arrester

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