CN102023249A - Method for performing preventive test without detaching high-voltage lead of 220-kV zinc oxide arrestor - Google Patents
Method for performing preventive test without detaching high-voltage lead of 220-kV zinc oxide arrestor Download PDFInfo
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- CN102023249A CN102023249A CN2009101957669A CN200910195766A CN102023249A CN 102023249 A CN102023249 A CN 102023249A CN 2009101957669 A CN2009101957669 A CN 2009101957669A CN 200910195766 A CN200910195766 A CN 200910195766A CN 102023249 A CN102023249 A CN 102023249A
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- lightning arrester
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- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 title claims abstract description 112
- 239000011787 zinc oxide Substances 0.000 title claims abstract description 56
- 238000012360 testing method Methods 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 18
- 230000003449 preventive effect Effects 0.000 title abstract description 10
- 229960001296 zinc oxide Drugs 0.000 claims description 48
- 239000000463 material Substances 0.000 abstract description 5
- 238000012423 maintenance Methods 0.000 abstract description 4
- 238000005259 measurement Methods 0.000 abstract description 2
- 238000002474 experimental method Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 238000009413 insulation Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
- 238000009666 routine test Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Abstract
A method for performing preventive test without detaching high-voltage lead of 220-kV zinc oxide arrestor belongs to the measurement field. An upper segment lead of the zinc oxide arrestor is grounded; a direct current high voltage is added to the bottom of the upper segment zinc oxide arrestor through a high-voltage microammeter by a direct current generator; the high-voltage microammeter is connected with the upper segment zinc oxide arrestor through a shielding line; the bottom of a lower segment zinc oxide arrestor is disconnected from an online detector; the bottom of the lower segment zinc oxide arrestor is grounded through the microammeter; current reading I2 of the microammeter at low-voltage side is read to obtain a leak current value of the lower segment arrestor; the leak current value of the upper segment arrestor is obtained by using the current reading I of the microammeter at high-voltage side to subtract the current reading I2 of the microammeter at low-voltage side. The preventive test can be performed without detaching the high-voltage lead of the 220-kV zinc oxide arrestor, the method is simple to operate and can ensure test error with labour and material being saved; the maintenance interruption time is reduced and the test work efficiency is improved.
Description
Technical field
The invention belongs to fields of measurement, relate in particular to a kind of pre-method for testing that is used for high-tension apparatus.
Background technology
The various large-scale high-tension unit/equipment of a large amount of employings in the transformation and distribution system, need regularly these high-tension unit/equipment to be carried out preventive trial (abbreviation prerun), whether qualified, with safety, the stable operation of guaranteeing total system if testing its various electricity function indexs.
For guaranteeing that test findings accurately and reliably, reject other equipment to being influenced by the association of test equipment, simultaneously also in order to ensure peripheral equipment, personnel's safety, usually when high-tension unit/equipment is carried out preventive trial, need to remove its relevant high-voltage connection, make equipment under test and its peripheral equipment form " disconnection " and " insulation " on the circuit connecting relation.
Remove high-voltage connection and need use lift truck, crane, workload is big, and disconnecting time is long, and is expensive big, and the person and device security are all constituted certain threat.
For having improved experiment work efficient, save human and material resources, reduce power off time, the person and device security have been ensured better, in actual electric power overhaul/experiment work, exploring and do not tearing high-voltage connection open, various high-tension apparatus/devices are carried out the method for preventive trial.
Because disconnecting lead does not carry out preventive trial, normally carries out under the situation that electric substation's power equipment partly has a power failure, will run into electric field and disturb by force the easy distortion of test data, a series of problems such as the various power equipments that link together interfere with each other, restriction.
For this reason, must solve a following difficult problem:
(1) determines that other equipment that link to each other with tested device all can tolerate the trial voltage that applies;
(2) guarantee tested device under the situation that other equipment parallel connections are arranged, measuring accuracy is unaffected;
(3) test connection that adopts anti-highfield to disturb.
So, must formulate reasonably test/mode of connection of a cover at an above difficult problem, solve a difficult problem set forth above, both simple, again can the warranty test error.
The main project of Zinc-Oxide Arrester prerun is to measure direct current 1mA voltage (U
1mA) and 0.75U
1mAUnder leakage current.
Summary of the invention
Technical matters to be solved by this invention provides the pre-method for testing that a kind of 220kV Zinc-Oxide Arrester is not torn high-voltage connection open, it need not to remove the high-voltage connection of Zinc-Oxide Arrester, save human and material resources, reduced the interruption maintenance time, improved experiment work efficient.
Technical scheme of the present invention is: the pre-method for testing that provides a kind of 220kV Zinc-Oxide Arrester not tear high-voltage connection open, comprise the Zinc-Oxide Arrester that is divided into upper and lower two joints, and it is characterized in that:
The lead-in wire that saves on the Zinc-Oxide Arrester is passed through ground connection disconnecting link or temporary ground wire ground connection;
Add high direct voltage by a high pressure microampere meter in the bottom of last joint Zinc-Oxide Arrester with dc generator;
Described high pressure microampere meter is connected with last joint Zinc-Oxide Arrester through shielding line;
Disconnect the joint bottom of Zinc-Oxide Arrester and being connected of on-line detector down;
The bottom of saving Zinc-Oxide Arrester down is by microampere meter ground connection;
By reading the current indication I of low-pressure side microampere meter
2, obtain down the leakage current values of joint lightning arrester;
By reading the current indication I of high pressure microampere meter, deduct the current indication I of low-pressure side microampere meter again
2, obtain the joint lightning arrester leakage current values.
Further, its dc generator is connected with the bottom of high pressure microampere meter with last joint Zinc-Oxide Arrester by shielding line.
Concrete, the reading I of described high pressure microampere meter is the electric current sum of upper and lower two joint lightning arresters, promptly the reading I=of high pressure microampere meter goes up the electric current I of joint lightning arrester
1The electric current I of+following joint lightning arrester
2
The current indication I of joint lightning arrester under the current indication I-of described high pressure microampere meter
2During=1mA, the VD value of dc generator is the U of joint lightning arrester
1mAValue.
As the described current indication I of joint lightning arrester down
2During=1mA, the VD value of dc generator is down the U of joint lightning arrester
1mAValue.
When the output voltage of described dc generator is 75%U
1mAThe time, on save the current indication I of lightning arrester
1The current indication I of joint lightning arrester under the reading I-of=high pressure microampere meter
2, this reading is the leakage current values of joint lightning arrester.
When the output voltage of described dc generator is 75%U
1mAThe time, the current indication I of following joint lightning arrester
2, be down the leakage current values of joint lightning arrester.
Compared with the prior art, advantage of the present invention is:
The high-voltage connection that need not to remove Zinc-Oxide Arrester can carry out preventive trial, and is both simple, again can the warranty test error, saved human and material resources, and reduced the interruption maintenance time, improved experiment work efficient.
Description of drawings
Fig. 1 is a method schematic block diagram of the present invention;
Fig. 2 is a connection line synoptic diagram of the present invention.
1 is last joint lightning arrester among the figure, and 2 are following joint lightning arrester, and 3 is shielding line, and DC is a dc generator, and mA1 is the high pressure microampere meter, and mA2 is the low-pressure side microampere meter, and J is an on-line detector.
Embodiment
The present invention will be further described below in conjunction with accompanying drawing.
Among Fig. 1, this method comprises the following steps: at least
The lead-in wire that saves on the Zinc-Oxide Arrester is passed through ground connection disconnecting link or temporary ground wire ground connection;
Add high direct voltage by a high pressure microampere meter in the bottom of last joint Zinc-Oxide Arrester with dc generator;
Described high pressure microampere meter is connected with last joint Zinc-Oxide Arrester through shielding line;
Disconnect the joint bottom of Zinc-Oxide Arrester and being connected of on-line detector down;
The bottom of saving Zinc-Oxide Arrester down is by microampere meter ground connection;
By reading the current indication I of low-pressure side microampere meter
2, obtain down the leakage current values of joint lightning arrester;
By reading the current indication I of high pressure microampere meter, deduct the current indication I of low-pressure side microampere meter again
2, obtain the joint lightning arrester leakage current values.
Provided the connection line synoptic diagram of this method among Fig. 2.
As seen from the figure, on save Zinc-Oxide Arrester 1 lead-in wire by ground connection disconnecting link or temporary ground wire ground connection, dc generator DC is connected with the bottom of last joint Zinc-Oxide Arrester by a high pressure microampere meter mA1, and it is applied high direct voltage; Save the bottom of Zinc-Oxide Arrester 2 and the brace place that is connected of on-line detector J down and be disconnected (representing with two disjunct circles among the figure); The bottom of saving Zinc-Oxide Arrester 2 down is by low-pressure side microampere meter mA2 ground connection; High pressure microampere meter mA1 is connected with last joint Zinc-Oxide Arrester through shielding line 3.
During prerun, by reading the current indication I of low-pressure side microampere meter
2, obtain down the leakage current values of joint lightning arrester.
By reading the current indication I of high pressure microampere meter, deduct the current indication I of low-pressure side microampere meter again
2, obtain the joint lightning arrester leakage current values.
Further, its dc generator is connected with the bottom of high pressure microampere meter with last joint Zinc-Oxide Arrester by shielding line.
Concrete, the reading I of described high pressure microampere meter is the electric current sum of upper and lower two joint lightning arresters, promptly the reading I=of high pressure microampere meter goes up the electric current I of joint lightning arrester
1The electric current I of+following joint lightning arrester
2
The current indication I of joint lightning arrester under the current indication I-of described high pressure microampere meter
2During=1mA, the VD value of dc generator is the U of joint lightning arrester
1mAValue.
As the described current indication I of joint lightning arrester down
2During=1mA, the VD value of dc generator is down the U of joint lightning arrester
1mAValue.
When the output voltage of described dc generator is 75%U
1mAThe time, on save the current indication I of lightning arrester
1The current indication I of joint lightning arrester under the reading I-of=high pressure microampere meter
2, this reading is the leakage current values of joint lightning arrester.
When the output voltage of described dc generator is 75%U
1mAThe time, the current indication I of following joint lightning arrester
2, be down the leakage current values of joint lightning arrester.
The preventive trial of 220kV Zinc-Oxide Arrester is primarily aimed at DC experiment.When not taking out stitches test, therefore the lead-in wire at Zinc-Oxide Arrester top can't connect microampere meter at the Zinc-Oxide Arrester top by ground connection disconnecting link or temporary ground wire ground connection.
During test, add high direct voltage by a high pressure microampere meter in the bottom of last joint Zinc-Oxide Arrester, and disconnect joint bottom of Zinc-Oxide Arrester and being connected of on-line detector down with dc generator, and by microampere meter ground connection.
Because the microampere meter internal resistance is very little, the Zinc-Oxide Arrester bottom supports that the insulation resistance of porcelain vase is very big, so the reading I of low-pressure side microampere meter
2Can think the leakage current of joint lightning arrester down.
Upper and lower two joint lightning arresters are in parallel, so the reading I of high pressure microampere meter be the two electric current sum that saves lightning arresters, i.e. I=I up and down
1+ I
2According to Kirchhoff's law, on save the leakage current I of lightning arrester
1=I-I
2
Should monitor the high-pressure side microampere meter during test, because the microampere meter electric current I of flowing through in high-pressure side is the electric current sum of two joint lightning arresters, i.e. I=I up and down at this moment
1+ I
2The general U of two joint lightning arresters up and down
1mAUnequal, when dc generator voltage is raised to U
1mAThe time, wherein the leakage current of a joint lightning arrester be because the non-linear resistance volt-ampere characteristic will substantially exceed 1mA, and this moment, the test loop high voltage side current may surpass instrument when specified and meet accident.
Therefore the electric current I that will control microampere meter can not exceed the ratings of dc generator, as the ratings of discovery I value near output current, and (I-I
2) or I
2When also not arriving 1mA, should stop test, check wiring and souvenir situation, as do not have other abnormal conditions, should remove once lead-in wire and carry out the conventional method test.
Adopt when not tearing high-voltage connection test method measuring Zinc-Oxide Arrester open, there is stray current over the ground in high-voltage connection, and this stray current flows through the high pressure microampere meter, again because high-voltage connection has certain length, so high-voltage connection stray current over the ground be can not ignore.During test, obviously because the existence of stray current makes the U that records
1mALess than normal and I
0.75U1mABigger than normal, influence is to the judgement of test figure.Therefore available shielding line as high-voltage connection to reduce high-voltage connection stray current over the ground.In addition, Zinc-Oxide Arrester body stray current over the ground also flows through microampere meter, brings error to test figure.But facts have proved that the error that Zinc-Oxide Arrester body stray current over the ground produces is very little.
Points for attention:
1. when descending the test of joint lightning arrester, because of considering the critical point difference of the non-linear factor and the electric current of upper and lower joint lightning arrester DC current, notice that the loop total current can not surpass the current rating of dc generator, generally select the output current of dc generator should be greater than 3mA.
2. the influence of or lightning arrester surface filth big with ambient humidity, reply lightning arrester surface is cleaned before test, if air humidity is big, shield test reactor is carried out on reply lightning arrester surface.
3. when testing, consider the influence of high-voltage connection corona, high-voltage connection should use shielding line, shortens high-voltage connection length as far as possible, and the angle of consideration lead-in wire and test specimen etc.
Because need not to remove the high-voltage connection of Zinc-Oxide Arrester, the technical program can carry out preventive trial, both simple, and again can the warranty test error, human and material resources have been saved, reduce the interruption maintenance time, improved experiment work efficient, reached the application's goal of the invention.
The present invention can be widely used in the routine test field of high-voltage arrester.
Claims (7)
1. a 220kV Zinc-Oxide Arrester is not torn the pre-method for testing of high-voltage connection open, comprises the Zinc-Oxide Arresters that are divided into upper and lower two joints, it is characterized in that:
The lead-in wire that saves on the Zinc-Oxide Arrester is passed through ground connection disconnecting link or temporary ground wire ground connection;
Add high direct voltage by a high pressure microampere meter in the bottom of last joint Zinc-Oxide Arrester with dc generator;
Described high pressure microampere meter is connected with last joint Zinc-Oxide Arrester through shielding line;
Disconnect the joint bottom of Zinc-Oxide Arrester and being connected of on-line detector down;
The bottom of saving Zinc-Oxide Arrester down is by microampere meter ground connection;
By reading the current indication I of low-pressure side microampere meter
2, obtain down the leakage current values of joint lightning arrester;
By reading the current indication I of high pressure microampere meter, deduct the current indication I of low-pressure side microampere meter again
2, obtain the joint lightning arrester leakage current values.
2. do not tear the pre-method for testing of high-voltage connection according to the described 220kV Zinc-Oxide Arrester of claim 1 open, it is characterized in that described dc generator is connected with the bottom of high pressure microampere meter with last joint Zinc-Oxide Arrester by shielding line.
3. do not tear the pre-method for testing of high-voltage connection open according to the described 220kV Zinc-Oxide Arrester of claim 1, the reading I that it is characterized in that described high pressure microampere meter is the electric current sum of upper and lower two joint lightning arresters, and promptly the reading I=of high pressure microampere meter goes up the electric current I of joint lightning arrester
1The electric current I of+following joint lightning arrester
2
4. do not tear the pre-method for testing of high-voltage connection according to claim 1,2 or 3 described 220kV Zinc-Oxide Arresters open, it is characterized in that the current indication I of joint lightning arrester under the current indication I-of described high pressure microampere meter
2During=1mA, the VD value of dc generator is the U of joint lightning arrester
1mAValue.
5. do not tear the pre-method for testing of high-voltage connection according to claim 1,2 or 3 described 220kV Zinc-Oxide Arresters open, it is characterized in that working as the described current indication I of joint lightning arrester down
2During=1mA, the VD value of dc generator is down the U of joint lightning arrester
1mAValue.
6. do not tear the pre-method for testing of high-voltage connection according to claim 1,2 or 3 described 220kV Zinc-Oxide Arresters open, it is characterized in that the output voltage when described dc generator is 75%U
1mAThe time, on save the current indication I of lightning arrester
1The current indication I of joint lightning arrester under the reading I-of=high pressure microampere meter
2, this reading is the leakage current values of joint lightning arrester.
7. do not tear the pre-method for testing of high-voltage connection according to claim 1,2 or 3 described 220kV Zinc-Oxide Arresters open, it is characterized in that the output voltage when described dc generator is 75%U
1mAThe time, the current indication I of following joint lightning arrester
2, be down the leakage current values of joint lightning arrester.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101957669A CN102023249A (en) | 2009-09-17 | 2009-09-17 | Method for performing preventive test without detaching high-voltage lead of 220-kV zinc oxide arrestor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101957669A CN102023249A (en) | 2009-09-17 | 2009-09-17 | Method for performing preventive test without detaching high-voltage lead of 220-kV zinc oxide arrestor |
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| Publication Number | Publication Date |
|---|---|
| CN102023249A true CN102023249A (en) | 2011-04-20 |
Family
ID=43864788
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|---|---|---|---|
| CN2009101957669A Pending CN102023249A (en) | 2009-09-17 | 2009-09-17 | Method for performing preventive test without detaching high-voltage lead of 220-kV zinc oxide arrestor |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103901309A (en) * | 2014-04-29 | 2014-07-02 | 国家电网公司 | Test method for high-voltage lead uncleared test device of 220-kV zinc oxide arrester |
| CN104007354A (en) * | 2013-02-27 | 2014-08-27 | 上海宝钢工业技术服务有限公司 | Whole-group test circuit and method for 10 kV zinc oxide lightning arrester and cable |
| 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 |
| 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 |
| CN106249098A (en) * | 2016-08-24 | 2016-12-21 | 广东电网有限责任公司惠州供电局 | Testing device for current leakage and method of testing is saved on high-voltage arrester |
| CN107727974A (en) * | 2017-11-09 | 2018-02-23 | 广西电网有限责任公司钦州供电局 | Test of lightning arrester device and method based on C-V characteristic skew |
| CN108572298A (en) * | 2018-06-04 | 2018-09-25 | 中国南方电网有限责任公司超高压输电公司柳州局 | A kind of more piece arrester test system |
| CN108872760A (en) * | 2018-04-20 | 2018-11-23 | 国家电网公司 | The auto-changing termination of without disconnecting power lead measurement 220kV Leakage Current of Zinc-oxide Lightning Arresters |
| CN109324214A (en) * | 2018-11-22 | 2019-02-12 | 国网新疆电力有限公司电力科学研究院 | Combined arrester leakage current measurement device |
| CN110108923A (en) * | 2019-05-29 | 2019-08-09 | 国网青海省电力公司检修公司 | The test method of high-voltage connection measurement Zinc-Oxide Arrester direct current leakage is not removed |
| CN111521847A (en) * | 2020-05-20 | 2020-08-11 | 国家电网有限公司 | Lightning arrester direct current test wiring converter |
| CN111736022A (en) * | 2020-06-18 | 2020-10-02 | 国网新疆电力有限公司检修公司 | Direct-current high-voltage generator testing device and testing method thereof |
| CN111856115A (en) * | 2020-06-24 | 2020-10-30 | 国网山东省电力公司淄博供电公司 | Intervention type measuring method for true leakage current of zinc oxide lightning arrester |
| CN111856114A (en) * | 2020-06-24 | 2020-10-30 | 国网山东省电力公司淄博供电公司 | Lightning arrester leakage current testing system and method for eliminating parasitic parameter influence |
| CN111856113A (en) * | 2020-06-24 | 2020-10-30 | 国网山东省电力公司淄博供电公司 | Non-intrusive measurement method for true leakage current of zinc oxide arrester |
-
2009
- 2009-09-17 CN CN2009101957669A patent/CN102023249A/en active Pending
Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104007354A (en) * | 2013-02-27 | 2014-08-27 | 上海宝钢工业技术服务有限公司 | Whole-group test circuit and method for 10 kV zinc oxide lightning arrester and cable |
| CN104007354B (en) * | 2013-02-27 | 2018-07-20 | 上海宝钢工业技术服务有限公司 | The total group test circuit and method of 10kV Zinc-Oxide Arresters and cable |
| CN103901309B (en) * | 2014-04-29 | 2017-12-08 | 国家电网公司 | 220kV Zinc-Oxide Arrester non-dismantle high voltages fuse experimental rig test methods |
| CN103901309A (en) * | 2014-04-29 | 2014-07-02 | 国家电网公司 | Test method for high-voltage lead uncleared test device of 220-kV zinc oxide arrester |
| 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 |
| 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 |
| CN106249098B (en) * | 2016-08-24 | 2023-08-22 | 广东电网有限责任公司惠州供电局 | Device and method for testing upper section leakage current of high-voltage lightning arrester |
| CN106249098A (en) * | 2016-08-24 | 2016-12-21 | 广东电网有限责任公司惠州供电局 | Testing device for current leakage and method of testing is saved on high-voltage arrester |
| CN107727974A (en) * | 2017-11-09 | 2018-02-23 | 广西电网有限责任公司钦州供电局 | Test of lightning arrester device and method based on C-V characteristic skew |
| CN107727974B (en) * | 2017-11-09 | 2023-12-29 | 广西电网有限责任公司钦州供电局 | Lightning arrester test device and method based on volt-ampere characteristic deviation |
| CN108872760A (en) * | 2018-04-20 | 2018-11-23 | 国家电网公司 | The auto-changing termination of without disconnecting power lead measurement 220kV Leakage Current of Zinc-oxide Lightning Arresters |
| CN108572298A (en) * | 2018-06-04 | 2018-09-25 | 中国南方电网有限责任公司超高压输电公司柳州局 | A kind of more piece arrester test system |
| CN109324214A (en) * | 2018-11-22 | 2019-02-12 | 国网新疆电力有限公司电力科学研究院 | Combined arrester leakage current measurement device |
| CN110108923A (en) * | 2019-05-29 | 2019-08-09 | 国网青海省电力公司检修公司 | The test method of high-voltage connection measurement Zinc-Oxide Arrester direct current leakage is not removed |
| CN111521847A (en) * | 2020-05-20 | 2020-08-11 | 国家电网有限公司 | Lightning arrester direct current test wiring converter |
| CN111736022A (en) * | 2020-06-18 | 2020-10-02 | 国网新疆电力有限公司检修公司 | Direct-current high-voltage generator testing device and testing method thereof |
| CN111856115A (en) * | 2020-06-24 | 2020-10-30 | 国网山东省电力公司淄博供电公司 | Intervention type measuring method for true leakage current of zinc oxide lightning arrester |
| CN111856114A (en) * | 2020-06-24 | 2020-10-30 | 国网山东省电力公司淄博供电公司 | Lightning arrester leakage current testing system and method for eliminating parasitic parameter influence |
| CN111856113A (en) * | 2020-06-24 | 2020-10-30 | 国网山东省电力公司淄博供电公司 | Non-intrusive measurement method for true leakage current of zinc oxide arrester |
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