CN102193040A - Method for performing insulation preventive test on zinc oxide lightning arrester without dismantling lead wire - Google Patents

Method for performing insulation preventive test on zinc oxide lightning arrester without dismantling lead wire Download PDF

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Publication number
CN102193040A
CN102193040A CN2010105927538A CN201010592753A CN102193040A CN 102193040 A CN102193040 A CN 102193040A CN 2010105927538 A CN2010105927538 A CN 2010105927538A CN 201010592753 A CN201010592753 A CN 201010592753A CN 102193040 A CN102193040 A CN 102193040A
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CN
China
Prior art keywords
lightning arrester
test
arrester
insulation
zinc
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Application number
CN2010105927538A
Other languages
Chinese (zh)
Inventor
马丽山
王生杰
王煜杰
张祥成
杨小库
徐世山
何宝龙
李军
韦强
吴童生
康钧
廖鹏
何艳娇
谢彭盛
曲全磊
杨放南
闫建新
Original Assignee
青海电力科学试验研究院
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Application filed by 青海电力科学试验研究院 filed Critical 青海电力科学试验研究院
Priority to CN2010105927538A priority Critical patent/CN102193040A/en
Publication of CN102193040A publication Critical patent/CN102193040A/en

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Abstract

The invention provides a method for performing insulation preventive test on a zinc oxide lightning arrester without dismantling a lead wire. The lightning arrester is divided into a first section, a second section, a third section and a fourth section from top to bottom respectively; the method for performing the insulation preventive test on the second section, the third section and the fourth section as well as a base is the same as the conventional method; the method is characterized in that: during test of an insulation resistance of the first section of the lightning arrester, after the zinc oxide lightning arrester is powered off and maintained, a grounding disconnecting link connected with the first section is grounded; at the same time, voltage is exerted at the lower end of the first section of the lightning arrester, and an insulation resistance tester is grounded; a tested value is the insulation resistance value of the first section of the lightning arrester; and a low meter method can be adopted for test, namely the upper end of the lightning arrester is grounded through a milliammeter, and direct-current voltage is exerted at the lower end of the first section of the lightning arrester. The test method has advantages that: due to the insulation preventive test performed on the zinc oxide lightning arrester without dismantling the lead wire, the working efficiency of the insulation preventive test performed on the zinc oxide lightning arrester can be improved greatly, the power-off time of the equipment can be shortened and the safety of the on-site test work can be enhanced.

Description

A kind of Zinc-Oxide Arrester is the method for disconnecting lead insulation preventive trial not
Technical field
The present invention relates to not the insulate method of preventive trial of disconnecting lead of a kind of Zinc-Oxide Arrester, belong to the power technology field.
Background technology
The preventive trial that Zinc-Oxide Arrester is traditional will be removed the high-voltage connection of lightning arrester before test, off-test recovers high-voltage connection again.Along with the electric equipment test method is updated, the test period of lightning arrester is progressively shortening, thereby the ratio that the time that disconnects the equipment high-voltage connection accounts for bulk testing seems particularly outstanding, has almost accounted for 2/3 of the bulk testing time.
According to the test method of routine, before carrying out the Zinc-Oxide Arrester preventive trial, must remove its high-pressure induct line and grading ring, carry out preventive trial again.But 750kV Zinc-Oxide Arrester height height, and its grading ring is also heavier, when dismounting, workload is big, if and this grading ring is arranged improper when adorning again, can cause the inhomogeneous of lightning arrester Potential distribution, thereby the electric field at some position is concentrated, under the effect of long-play voltage, can cause the premature deterioration of indivedual valve blocks.
Because 750kV Zinc-Oxide Arrester electric pressure height, its equipment volume is bigger, the device body is higher, diameter wire is thicker, disconnecting when lead-in wire because lead-in wire position height, distortion power are big, need use large-scale crane, bucket arm vehicle at the scene, buried bigger potential safety hazard for on-the-spot preventive trial, and power off time length has also constituted bigger threat to the stable operation of electrical network.
Therefore how to take effective research technique to obtain test figure accurately, it is very necessary seeking to make Zinc-Oxide Arrester neither to remove the test method that high-voltage connection can meet the demands again.
Summary of the invention
The objective of the invention is: in order to solve existing traditional Zinc-Oxide Arrester preventive trial method, before and after test, all to disconnect the high-voltage connection of tested device, need expend defectives such as great amount of manpower and material resources, financial resources and time, thereby provide a kind of Zinc-Oxide Arrester that can make neither to remove the test method that high-voltage connection can meet the demands again, thereby exempt its high-voltage connection of dismounting and grading ring, save test period, improve job security.
Technical scheme of the present invention is: a kind of Zinc-Oxide Arrester is the method for disconnecting lead insulation preventive trial not, lightning arrester is called first respectively from top to bottom, two, three, four joints, disconnecting lead is not tested, wherein, to second and third, four joints and the base test method of carrying out megger test is: test second and third, lightning arrester upper end pressurization during four joint insulation resistances, following termination Insulation Resistance Tester; During the testing base insulation resistance, take the Zinc-Oxide Arrester counter apart, the pressurization of base upper end, following termination Insulation Resistance Tester is characterized in that: during test first segment lightning arrester insulation resistance, behind the Zinc-Oxide Arrester interruption maintenance, coupled ground connection disconnecting link ground connection, this moment, Insulation Resistance Tester ground connection got final product in the pressurization of first segment lightning arrester lower end, and measured value is first segment lightning arrester insulation resistance value; Can compress into row with low table method and measure, be about to the lightning arrester upper end, apply DC voltage in first segment lightning arrester lower end by milliammeter ground connection.
The invention has the beneficial effects as follows: Zinc-Oxide Arrester provided by the invention is the method for disconnecting lead insulation preventive trial not, it has the following advantages: disconnecting lead does not carry out work efficiency, the minimizing equipment power off time that the zinc oxide lightning arrester insulation preventive trial can greatly promote the zinc oxide lightning arrester insulation preventive trial, improves the security of site test work.
Description of drawings
Fig. 1 is a disconnecting lead experimental enviroment simulation drawing not fully of the present invention.
Fig. 2 is the first segment lightning arrester of a disconnecting lead test Zinc-Oxide Arrester disconnecting lead megger test wiring diagram not fully of the present invention.
Fig. 3 is the first segment lightning arrester DC experiment wiring diagram of disconnecting lead test Zinc-Oxide Arrester not fully of the present invention.
Fig. 4 is the second joint lightning arrester DC experiment wiring diagram that fully disconnecting lead of the present invention is tested Zinc-Oxide Arrester.
Fig. 5 is the 3rd joint lightning arrester DC experiment wiring diagram that fully disconnecting lead of the present invention is tested Zinc-Oxide Arrester.
Fig. 6 is the 4th joint lightning arrester DC experiment wiring diagram that fully disconnecting lead of the present invention is tested Zinc-Oxide Arrester.
Embodiment
Below in conjunction with drawings and Examples to Zinc-Oxide Arrester of the present invention not the method for disconnecting lead insulation preventive trial be described in further detail.
Zinc-Oxide Arrester prerun project provided by the invention and standard-required are as shown in the table:
Table 1 Zinc-Oxide Arrester prerun project and standard-required
It is conventional preventive trial method that the dismounting high-voltage connection is tested, Zinc-Oxide Arrester has a power failure according to plan, and the maintainer removes high-voltage connection afterwards, and testing crew carries out preventive trial, after the off-test test figure was all qualified, it is leaded that the maintainer recovers institute again.Under this experimental enviroment, primary equipments such as the high-voltage connection that is connected with Zinc-Oxide Arrester, capacitance type potential transformer, transformer all can not exert an influence to transformer prerun data, and test gained data are the most accurate.
Disconnecting lead is not tested, and operating condition of test is the most complicated.The primary equipment that links to each other with Zinc-Oxide Arrester has capacitance type potential transformer, transformer, insulator pillar etc., and Zinc-Oxide Arrester self grading ring is bigger, and these all can impact test findings when testing.Especially during the leakage current test under carrying out 75% direct current 1mA reference voltage, institute's making alive is higher, difficulty comparatively when disconnecting lead is not tested.Figure 1 shows that fully not disconnecting lead experimental enviroment simulation drawing.
The Zinc-Oxide Arrester structural drawing is gone up joint lightning arrester upper end ground connection most as shown in Figure 3 when disconnecting lead does not carry out the lightning arrester insulation resistance test.For sake of convenience, lightning arrester is called the first, two, three, four joints from top to bottom respectively.When dismounting Zinc-Oxide Arrester lead-in wire carries out megger test, need test the insulating resistance value and the base insulating resistance value of the first, two, three, four joint lightning arresters respectively.When testing, respectively the Zinc-Oxide Arrester each several part is carried out megger test according to conventional method.
When disconnecting lead is not tested, second and third, four joint lightning arresters and base insulation resistance test methods are the same with the conventional test method: test second and third, following termination Insulation Resistance Tester " E " is pressurizeed in the lightning arrester upper end during four joint insulation resistances; During the testing base insulation resistance, take the Zinc-Oxide Arrester counter apart, the pressurization of base upper end, following termination Insulation Resistance Tester " E ".When test first segment lightning arrester insulation resistance,, therefore can't pressurize in the top because the high-pressure side is circumscribed with primary equipment.Behind the Zinc-Oxide Arrester interruption maintenance, coupled ground connection disconnecting link ground connection, this moment should be in the pressurization of first segment lightning arrester lower end, and Insulation Resistance Tester " E " ground connection gets final product, measured value is first segment lightning arrester insulation resistance value, and its test connection as shown in Figure 2.
When not tearing high-voltage connection open and test, lightning arrester links to each other with transformer, capacitance type potential transformer, transmission line of electricity, and the ground connection disconnecting link that links to each other with lightning arrester is a ground connection.When carrying out the test of first segment lightning arrester, can not directly apply voltage in the top, because the valve block of lightning arrester is a non-linear resistance, the electric current unanimity that forward and reverse pressurization is passed through, therefore, available low table method is compressed into row and is measured, and is about to the lightning arrester upper end by milliammeter ground connection, applies DC voltage in first segment lightning arrester lower end.Like this, first segment lightning arrester upper end is an electronegative potential, and coupled primary equipment is all unaffected, and the measurement data of milliammeter only is the current value of last joint unit of an arrester, thereby test result accurately, reliably.
The DC experiment wiring of first segment lightning arrester such as Fig. 3.
When the first segment lightning arrester was measured, the B point connect high direct voltage through reometer PA, and the A point is through reometer PA2 ground connection, and the D point is through reometer PA1 ground connection.As test current I-I 1During=1mA, the output voltage of high voltage direct current generator is first segment lightning arrester direct current 1mA reference voltage U 1mA, when the high voltage direct current generator output voltage is reduced to 0.75U 1mAThe time, electric current I-I 1Be 75%U 1mALeakage current under the reference voltage it should be noted that during test after all test wire connections finish, and draws back the grounding switch of lightning arrester upper end again.
Second joint lightning arrester DC experiment wiring such as Fig. 4.
When the second joint lightning arrester was measured, the C point connect high direct voltage through reometer PA, and the B point is through reometer PA2 ground connection, and the D point is through reometer PA1 ground connection.As test current I-I 1During=1mA, the output voltage of high voltage direct current generator is the second joint lightning arrester direct current 1mA reference voltage U 1mA, when the high voltage direct current generator output voltage is reduced to 0.75U 1mAThe time, electric current I-I 1Be 75%U 1mALeakage current under the reference voltage.
The 3rd joint lightning arrester DC experiment wiring such as Fig. 5.
When the 3rd joint lightning arrester was measured, the C point connect high direct voltage through reometer PA, and the D point is through reometer PA2 ground connection.As test current I-I 1During=1mA, the output voltage of high voltage direct current generator is the 3rd joint lightning arrester direct current 1mA reference voltage U 1mA, when the high voltage direct current generator output voltage is reduced to 0.75U1mA, electric current I-I 1Be 75%U 1mALeakage current under the reference voltage.
The 4th joint lightning arrester DC experiment wiring such as Fig. 6.
When the 4th joint lightning arrester was measured, the D point connect high direct voltage through reometer PA, and the F point is through reometer PA2 ground connection.As test current I-I 1During=1mA, the output voltage of high voltage direct current generator is the 4th joint lightning arrester direct current 1mA reference voltage U 1mA, when the high voltage direct current generator output voltage is reduced to 0.75U 1mAThe time, electric current I-I 1Be 75%U 1mALeakage current under the reference voltage.
By field measurement, not during disconnecting lead first segment measurement data measurement data when removing lead-in wire compare bigger than normal slightly, and the basic bias free of test data of its excess-three joint.This is that the ground connection disconnecting link does not generally allow to open, and therefore can't be connected in series milliammeter because carry out lightning arrester when test.The measurement of first segment lightning arrester can only be tested with the method for high pressure meter reading at this moment.Value by table PA not only is the leakage current of first segment lightning arrester, also comprises various stray currents over the ground.Be mainly: the corona current of test lead; Second and third, four the joint lightning arresters leakage current; Leakage current along the insulator surface.In actual measurement, these interference currents are rejected to minimum after, when the electric current among the table PA deducts electric current among the table PA1 and reaches 1mA, can think that the output voltage of high voltage direct current generator is first segment lightning arrester direct current 1mA reference voltage U 1mA, when the high voltage direct current generator output voltage is reduced to 0.75U 1mAThe time, table PA is 75%U with the difference of showing among the PA1 1mALeakage current under the reference voltage.
By preliminary analysis and later stage site test, test data is tested gained data basically identical with removing lead-in wire, proves that or not is feasible that disconnecting lead carries out the zinc oxide lightning arrester insulation preventive trial.Disconnecting lead does not carry out work efficiency, the minimizing equipment power off time that the zinc oxide lightning arrester insulation preventive trial can greatly promote the zinc oxide lightning arrester insulation preventive trial, improves the security of site test work.

Claims (1)

1. the Zinc-Oxide Arrester method of disconnecting lead insulation preventive trial not is called the first, two respectively from top to bottom with lightning arrester, three, four joints, disconnecting lead is not tested, wherein, to second and third, four joints and the base test method of carrying out megger test is:
Test second and third, lightning arrester upper end pressurization during insulation resistances of four joints, following termination Insulation Resistance Tester;
During the testing base insulation resistance, take the Zinc-Oxide Arrester counter apart, the pressurization of base upper end, following termination Insulation Resistance Tester is characterized in that:
During test first segment lightning arrester insulation resistance, behind the Zinc-Oxide Arrester interruption maintenance, coupled ground connection disconnecting link ground connection, this moment, Insulation Resistance Tester ground connection got final product in the pressurization of first segment lightning arrester lower end, and measured value is first segment lightning arrester insulation resistance value; Can compress into row with low table method and measure, be about to the lightning arrester upper end, apply DC voltage in first segment lightning arrester lower end by milliammeter ground connection.
CN2010105927538A 2010-12-17 2010-12-17 Method for performing insulation preventive test on zinc oxide lightning arrester without dismantling lead wire CN102193040A (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102539979A (en) * 2012-02-07 2012-07-04 云南电力试验研究院(集团)有限公司电力研究院 Method for evaluating inner insulation performance of monolithic suspension insulator by testing direct-current leaked currents
CN102692581A (en) * 2012-06-19 2012-09-26 国电大渡河检修安装有限公司 Current leakage test method for lightning arrestor
CN103630729A (en) * 2013-11-13 2014-03-12 国家电网公司 One-step wiring device and method for testing 1000kV lightning arrester reference voltage and leakage current
CN104049161A (en) * 2014-05-20 2014-09-17 国家电网公司 Testing connecting structure and testing method for substation field lightning arrester without demounting primary high-voltage lead
CN104267260A (en) * 2014-10-20 2015-01-07 国家电网公司 110 kV combined type zinc oxide lightning arrester preventive test method without dismantling high voltage lead
CN105223407A (en) * 2015-09-11 2016-01-06 国家电网公司 500kV Zinc-Oxide Arrester non-dismantle high voltages fuse measures DC leakage method
CN105242112A (en) * 2015-09-02 2016-01-13 华北电力科学研究院有限责任公司 Wind power generator set lightning triggering channel resistance value test method
CN105974229A (en) * 2016-05-06 2016-09-28 国网山东省电力公司青州市供电公司 Disconnection-free testing method for high voltage electric equipment in transformer substation

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CN101246196A (en) * 2008-03-24 2008-08-20 江苏省电力公司南京供电公司 Double-segment zinc oxide lightning arrester insulation status testing method
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CN101246196A (en) * 2008-03-24 2008-08-20 江苏省电力公司南京供电公司 Double-segment zinc oxide lightning arrester insulation status testing method
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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102539979A (en) * 2012-02-07 2012-07-04 云南电力试验研究院(集团)有限公司电力研究院 Method for evaluating inner insulation performance of monolithic suspension insulator by testing direct-current leaked currents
CN102692581A (en) * 2012-06-19 2012-09-26 国电大渡河检修安装有限公司 Current leakage test method for lightning arrestor
CN103630729A (en) * 2013-11-13 2014-03-12 国家电网公司 One-step wiring device and method for testing 1000kV lightning arrester reference voltage and leakage current
CN103630729B (en) * 2013-11-13 2015-12-30 国家电网公司 The primary connection device and method of test 1000kV lightning arrester reference voltage and leakage current
CN104049161A (en) * 2014-05-20 2014-09-17 国家电网公司 Testing connecting structure and testing method for substation field lightning arrester without demounting primary high-voltage lead
CN104267260A (en) * 2014-10-20 2015-01-07 国家电网公司 110 kV combined type zinc oxide lightning arrester preventive test method without dismantling high voltage lead
CN105242112A (en) * 2015-09-02 2016-01-13 华北电力科学研究院有限责任公司 Wind power generator set lightning triggering channel resistance value test method
CN105223407A (en) * 2015-09-11 2016-01-06 国家电网公司 500kV Zinc-Oxide Arrester non-dismantle high voltages fuse measures DC leakage method
CN105974229A (en) * 2016-05-06 2016-09-28 国网山东省电力公司青州市供电公司 Disconnection-free testing method for high voltage electric equipment in transformer substation

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Application publication date: 20110921