CN101368995B - Non-head dismantling test method for GIS combined electrical apparatus and plug-pull type transformer - Google Patents
Non-head dismantling test method for GIS combined electrical apparatus and plug-pull type transformer Download PDFInfo
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- CN101368995B CN101368995B CN2008101370443A CN200810137044A CN101368995B CN 101368995 B CN101368995 B CN 101368995B CN 2008101370443 A CN2008101370443 A CN 2008101370443A CN 200810137044 A CN200810137044 A CN 200810137044A CN 101368995 B CN101368995 B CN 101368995B
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- 238000010998 test method Methods 0.000 title claims abstract description 31
- 238000012360 testing method Methods 0.000 claims abstract description 49
- 238000009413 insulation Methods 0.000 claims abstract description 31
- 238000007789 sealing Methods 0.000 claims abstract description 10
- 229920000915 polyvinyl chloride Polymers 0.000 claims abstract description 8
- 239000004800 polyvinyl chloride Substances 0.000 claims abstract description 8
- 238000004804 winding Methods 0.000 claims description 19
- 238000002474 experimental method Methods 0.000 claims description 11
- 238000005259 measurement Methods 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 4
- 238000005452 bending Methods 0.000 abstract 1
- 238000001514 detection method Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000003449 preventive effect Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008033 biological extinction Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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Abstract
The invention discloses a test method for a plug-pull transformer of a GIS combined electrical apparatus without detaching the connectors, which does not need to plug or pull the connected plug-pull connector when the electronic transformer is tested, but to use an earth sleeve on the input-line earth switch which is arranged on the GIS combined electrical apparatus as the special transformer test sleeve to perform the test of the transformer; the improvement of the wiring in the test is: 1. an earth line on the input-line earth switch of the GIS combined electrical apparatus, which is connected with the transformer plug-pull connector, is untied; and the earth sleeve is insulated through a polyvinyl chloride insulation pyrocondensation sheath; 2. a polyvinyl chloride insulation cable sealing line with a diameter of 0.5mm<2> can be selected to perform the sealing seal between the GIS combined electrical apparatus and the transformer, and the line connection is guaranteed to be the shortest and without bending; and 3.a special test lead is used to test the DC resistance of the connection circuit. The test method without detaching the connectors can save the fund for purchasing special test sleeves and the cost for storing in storeroom, reduce labor intensity of testing personnel, shorten the time of power off, and has a wide application value in the power industry.
Description
Technical field
The present invention relates to a kind of GIS combined electrical apparatus and plug-in transformer test method without disconnection, belong to power equipment detection technique field.
Background technology
Along with applying of new technology new product, 110kV, GIS combined electrical apparatus and plug-in transformer large scale electrical power unit are in the electric system widespread usage, because inside is filled with SF
6Characteristics such as blanket gas has excellent insulation property energy and arc extinction performance, and no fire hazard is compared with conventional electrical appliance, and it is little to have floor area, safe and reliable to operation.Existing problems are: because the device structure characteristics, after the connect-disconnect plug that the GIS combined electrical apparatus need be connected with transformer when carrying out preventive trial or cycle detection is extracted, insert special-purpose test casing transformer is carried out the various performance parameters detection, this test method not only needs to purchase special-purpose test casing, exist following problems simultaneously: 1, special-purpose test casing acquisition expenses is higher and need special-purpose constant temperature storehouse when depositing, the sealing keeping, expense is big; 2, test the time need disassemble 3 connect-disconnect plugs and the stube cable on the transformer earlier, change the special-purpose test casing that storehouse is deposited again, the test casing that to dismantle following three special uses after having detected is wiped examination, is sealed, preserves, refills former three cable connect-disconnect plugs dismantling, dismounting, the set-up time is longer, prolonged power off time accordingly; 3, because cable is thicker, test bigger with sleeve pipe, dismantle, labour intensity is big in the installation process, needs personnel many, set-up procedure and terminal procedure time are long; 4, often easily generation wearing and tearing of plug of transformer connect-disconnect plug cooperate tight easily generation to leak or moisture enters, and are very big to working the mischief property of the normal operation of equipment; 5, the transformer connect-disconnect plug often plugs test, inevitably easily produces the loose contact phenomenon, occurs local overheating when causing equipment operation.
Summary of the invention
In order to address the above problem, the object of the present invention is to provide a kind of GIS combined electrical apparatus and plug-in transformer test method without disconnection: be exactly to utilize existing experimental technique, test method and test connection are improved, without a test method of tearing open of connect-disconnect plug,, transformer detects and being carried out various performance parameters.GIS combined electrical apparatus and plug-in transformer test method without disconnection are exactly the bonding apparatus design feature, utilize with the direct-connected GIS combined electrical apparatus of transformer on grounding disconnecting link three-phase draw earthing pole and transformer carried out preventive trial as the special-purpose test casing of transformer.Facts have proved that utilizing this technology that transformer is carried out preventive trial can reach a conventional test detection effect of tearing open fully.Can shorten the equipment power off time greatly, alleviate maintainer's labour intensity, the reduction expense.
The technical scheme that technical solution problem of the present invention is adopted is: GIS combined electrical apparatus and plug-in transformer test method without disconnection, be when the 110kV power transformer is tested, not plug connected connect-disconnect plug, need not change the special-purpose test casing of transformer and detect, but utilize the grounding sleeve on the grounding switch on the connected GIS combined electrical apparatus the every technical parameter of transformer to be tested as transformer special test sleeve pipe.Its test method of not disconnection experimental technique and test connection improve: 1. on the GIS combined electrical apparatus that will be connected with the transformer connect-disconnect plug on the inlet wire grounding switch ground wire untie, select for use polyvinyl chloride insulation pyrocondensation sheath to insulate to grounding sleeve; 2. GIS combined electrical apparatus and transformer bay distance is far away, selects for use line directly to be 0.5mm
2Insulation PVC cable closure line seal and guarantee that wiring is the shortest, not crooked; 3. select the direct current resistance of special test lead test connection line for use; Adopt the every measurement of technical parameter of this method to be:
＜1〉measures direct current resistance: can directly record A phase direct current resistance R ' a, B phase direct current resistance R ' b, C phase direct current resistance R ' c by grounding sleeve; Wherein: R ' a=Ra+R '
1+ R '
2, R ' b=Rb+R '
1+ R '
2, R ' c=Rc+R '
1+ R '
2In the formula: R '
1Be grounding switch direct current contact resistance, its value can directly record; R '
2Be the cable loop direct current resistance, its value can directly record; Cut R ' respectively with the R ' a that records, R ' b, R ' c
1, R '
2Can draw Ra, Rb, Rc, Ra, Rb, Rc are and tear A phase direct current resistance Ra, B phase direct current resistance Rb, the C phase direct current resistance Rc that head is tested the high pressure winding that records open.
＜2〉measurement insulation resistance: after the whole sealings of winding, can directly record R ' by grounding sleeve
High, R '
High=R
1//R
12//R
3//R
4, in the formula: R
3For cable insulation against ground resistance, can directly record R
4For grounding sleeve insulation against ground resistance, can directly record; Owing to recorded R '
High, thereby can calculate high-pressure side R over the ground
High=R
1//R
12Insulating resistance value, in the formula: R
1Be high pressure winding insulation against ground resistance, R
12Be insulation resistance between the high and low pressure winding; R
HighBe and tear the high-pressure side insulation against ground resistance that a test method records open.
＜3〉measuring media angle of loss and electric capacity: can calculate dielectric loss angle by the electric capacity of measuring; After the whole sealings of winding, can directly record C ' x, C ' x=C by grounding sleeve
1+ C
12+ C
3+ C
4, in the formula: C
3Be the cable earth capacitance amount, can directly record C
4Be the grounding sleeve ground capacitance, can directly record, cut C by the C ' x value that has recorded
3And C
4Value can draw high-pressure side Cx=C over the ground
1+ C
12Electric capacity, in the formula: C
1Be high pressure winding-to-earth capacity amount, C
12Be electric capacity between the high and low pressure winding, Cx is and tears the high-pressure side ground capacitance that a test method records open, and can calculate dielectric loss angle.
The invention has the beneficial effects as follows: replace the conventional technical barrier that a test method has fundamentally solved the special-purpose test casing of transformer that need adopt transformer testing of tearing open with test method without disconnection, can save fund and the storehouse storage cost of purchasing special-purpose test casing, can reduce testing staff's labour intensity, shorten power off time 4 hours, reduce cable connect-disconnect plug wearing and tearing in the disassembly process, avoid the contact place to have the loose contact phenomenon fully, improve the reliability of equipment operation and the economic benefit and the social benefit of power supply enterprise, have equipment test application value of the same type.
Description of drawings
The present invention is further described below in conjunction with drawings and Examples
Fig. 1 is the test philosophy figure of GIS combined electrical apparatus of the present invention and plug-in transformer test method without disconnection.
Fig. 2 is the direct current resistance test philosophy figure of Fig. 1.
Fig. 3 is the megger test schematic diagram of Fig. 1.
Fig. 4 is dielectric loss angle and the capacity measurement schematic diagram of Fig. 1.
Number in the figure
1, connect-disconnect plug 2, grounding switch
Embodiment
See also Fig. 1, Fig. 2, Fig. 3, Fig. 4, GIS combined electrical apparatus and plug-in transformer test method without disconnection: be when the 110kV power transformer is tested, not plug connected connect-disconnect plug (1), need not change the special-purpose test casing of transformer and detect, but utilize the grounding sleeve on the grounding switch (2) on the connected GIS combined electrical apparatus the every technical parameter of transformer to be tested as the special-purpose test casing of transformer.Its test method of not disconnection experimental technique and test connection improve: 1. will untie with ground wire on the inlet wire grounding switch (2) on the GIS combined electrical apparatus that transformer connect-disconnect plug (1) is connected, and select for use polyvinyl chloride insulation pyrocondensation sheath to insulate to grounding sleeve.2. GIS combined electrical apparatus and transformer bay distance is far away, selects for use line directly to be 0.5mm
2Insulation PVC cable closure line seal and guarantee that wiring is the shortest, not crooked.3. select the direct current resistance of special test lead test connection line for use.
On-the-spot to 110kV, the every preventative measurement of technical parameter of 31500kVA power transformer: power transformer nameplate data see Table 1:
Table 1 nameplate data
Measure direct current resistance;
Tear open a test method can directly record A to direct current resistance Ra, B to direct current resistance Rb, C to direct current resistance Rc, be the transformer original experiment data and see Table 2
Table 2 original experiment data direct current resistance temperature: 22 ℃; Oil temperature: 22 ℃
Instrument for measuring DC resistance (3393)
Test method without disconnection can directly record A phase direct current resistance R ' a, B phase direct current resistance R ' b, C phase direct current resistance R ' c, wherein R ' a=Ra+R ' by grounding sleeve
1+ R '
2, R ' b=Rb+R '
1+ R '
2, R ' c=Rc+R '
1+ R '
2R ' in the formula
1For direct current contact resistance, its value of grounding switch (2) can directly record.R '
2Be the cable loop direct current resistance, its value can directly record, and cuts R ' respectively with R ' a, the R ' b, the R ' c that record
1, R '
2Can draw Ra, Rb, Rc.Ra, Rb, Rc are and tear A phase direct current resistance Ra, B phase direct current resistance Rb, the C phase direct current resistance Rc that head is tested the high pressure winding that records open, record test figure and see Table 3.
Table 3 direct current resistance on-site measurement value temperature: 28 ℃; Oil temperature: 28 ℃
Instrument for measuring DC resistance (3393)
Measurement insulation resistance:
With winding all after the sealing, tearing a test method open, can directly to record high-pressure side insulation against ground resistance be R
High=R
1//R
12, promptly be that the transformer original experiment data sees Table 4
Table 4 original experiment data insulation resistance (M Ω) temperature: 22 ℃; Oil temperature: 22 ℃
Use: 5000V 200000M Ω megger
Test method without disconnection after the whole sealings of winding, can directly record R ' by grounding sleeve
High=R
1//R
12//R
3//R
4, R in the formula
3For cable insulation against ground resistance, can directly record R
4For grounding sleeve insulation against ground resistance, can directly record, owing to recorded R '
High, thereby can calculate R
High=R
1//R
12Insulating resistance value, in the formula: R
1Be high pressure winding insulation against ground resistance, R
12Be insulation resistance between the high and low pressure winding; R
HighBe and tear the high-pressure side insulation against ground resistance that a test method records open.Record test figure and see Table 5
Table 5 insulation resistance on-site measurement value (M Ω) temperature: 28 ℃; Oil temperature: 28 ℃
Use: 5000V 200000M Ω megger
Measure dielectric loss angle and electric capacity:
Can calculate dielectric loss angle by the capacitance of measuring.Tear the head test open and can directly record high-pressure side ground capacitance C
x=C
1+ C
12, be the transformer original experiment data and see Table 6
Table 6 original experiment data dielectric loss angle temperature: 22 ℃; Oil temperature: 22 ℃
Use: the Shandong electric bridge
The not disconnection test method(s) after the whole sealings of winding, can directly record C ' x=C by grounding sleeve
1+ C
12+ C
3+ C
4, in the formula: C
3Be the cable earth capacitance amount, can directly record C
4Be the grounding sleeve ground capacitance, can directly record, cut C by the C ' x value that has recorded
3And C
4Value can draw Cx=C
1+ C
12Electric capacity is in the formula: C
1Be high pressure winding-to-earth capacity amount, C
12Be electric capacity between the high and low pressure winding, Cx is and tears the high-pressure side ground capacitance that a test method records open, and can calculate dielectric loss angle, records test figure and sees Table 7
Table 7 dielectric loss angle on-site measurement value temperature: 28 ℃; Oil temperature: 28 ℃
Use: the Shandong electric bridge
By site test and theoretical analysis, GIS combined electrical apparatus and plug-in transformer test method without disconnection, original experiment data contrast basically identical before scene every technical parameter test determination value and power transformer dispatch from the factory, according to the regulation of " on-the-spot Insulation Test enforcement guide rule " DL/T474.1～DL/T474.5-2006, on-the-spot every technical parameter measured value can satisfy the site test requirement fully.
Claims (1)
1. GIS combined electrical apparatus and plug-in transformer test method without disconnection, be when the 110kV power transformer is tested, not plug connected connect-disconnect plug (1), need not change the special-purpose test casing of transformer and detect, but utilize the grounding sleeve on the grounding switch (2) on the connected GIS combined electrical apparatus the every technical parameter of transformer to be tested as transformer special test sleeve pipe; It is characterized in that: its test method of not disconnection experimental technique and test connection improve and are: 1. will untie with ground wire on the inlet wire grounding switch (2) on the GIS combined electrical apparatus that transformer connect-disconnect plug (1) is connected, and select for use polyvinyl chloride insulation pyrocondensation sheath to insulate to grounding sleeve; 2. GIS combined electrical apparatus and transformer bay distance is far away, selects for use line directly to be 0.5mm
2Insulation PVC cable closure line seal and guarantee that wiring is the shortest, not crooked; 3. select the direct current resistance of special test lead test connection line for use; Adopt the every measurement of technical parameter of this method to be:
＜1〉measures direct current resistance: can directly record A phase direct current resistance R ' a, B phase direct current resistance R ' b, C phase direct current resistance R ' c by grounding sleeve; Wherein: R ' a=Ra+R '
1+ R '
2, R ' b=Rb+R '
1+ R '
2, R ' c=Rc+R '
1+ R '
2, in the formula: R '
1Be grounding switch direct current contact resistance, its value can directly record; R '
2Be the cable loop direct current resistance, its value can directly record; Cut R ' respectively with the R ' a that records, R ' b, R ' c
1, R '
2Can draw Ra, Rb, Rc, Ra, Rb, Rc are and tear A phase direct current resistance Ra, B phase direct current resistance Rb, the C phase direct current resistance Rc that head is tested the high pressure winding that records open;
＜2〉measurement insulation resistance: after the whole sealings of winding, can directly record R ' by grounding sleeve
High, R '
High=R
1//R
12//R
3//R
4, in the formula: R
3For cable insulation against ground resistance, can directly record R
4For grounding sleeve insulation against ground resistance, can directly record; Owing to recorded R '
High, thereby can calculate high-pressure side R over the ground
High=R
1//R
12Insulating resistance value, in the formula: R
1Be high pressure winding insulation against ground resistance, R
12Be insulation resistance between the high and low pressure winding; R
HighBe and tear the high-pressure side insulation against ground resistance that a test method records open;
＜3〉measuring media angle of loss and electric capacity: can calculate dielectric loss angle by the electric capacity of measuring; After the whole sealings of winding, can directly record C ' x, C ' x=C by grounding sleeve
1+ C
12+ C
3+ C
4, in the formula: C
3Be the cable earth capacitance amount, can directly record C
4Be the grounding sleeve ground capacitance, can directly record, cut C by the C ' x value that has recorded
3And C
4Value can draw high-pressure side Cx=C over the ground
1+ C
12Electric capacity, in the formula: C
1Be high pressure winding-to-earth capacity amount, C
12Be electric capacity between the high and low pressure winding, Cx is and tears the high-pressure side ground capacitance that a test method records open, and can calculate dielectric loss angle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101370443A CN101368995B (en) | 2008-08-29 | 2008-08-29 | Non-head dismantling test method for GIS combined electrical apparatus and plug-pull type transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101370443A CN101368995B (en) | 2008-08-29 | 2008-08-29 | Non-head dismantling test method for GIS combined electrical apparatus and plug-pull type transformer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101368995A CN101368995A (en) | 2009-02-18 |
| CN101368995B true CN101368995B (en) | 2011-07-13 |
Family
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|---|---|---|---|
| CN2008101370443A Expired - Fee Related CN101368995B (en) | 2008-08-29 | 2008-08-29 | Non-head dismantling test method for GIS combined electrical apparatus and plug-pull type transformer |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103018576B (en) * | 2012-12-03 | 2014-12-24 | 杭州西湖电子研究所 | Method for measuring dielectric loss factor and insulation resistance of power transformer |
| CN103308799B (en) * | 2013-05-31 | 2015-12-23 | 国家电网公司 | The Apparatus and method for that a kind of cable-line parameter be connected with GIS is measured |
| CN104062526A (en) * | 2014-06-30 | 2014-09-24 | 国家电网公司 | Oil-oil bushing cable outlet transformer test method without head removing |
| 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 |
| CN106483382A (en) * | 2016-11-23 | 2017-03-08 | 云南电网有限责任公司电力科学研究院 | A kind of GIS circuit loop resistance measuring instrument and measuring method |
| CN107727932B (en) * | 2017-09-14 | 2019-09-24 | 中国长江电力股份有限公司 | A kind of loop resistance measurement method singly gone here and there in GIS under the conditions of Multi- Switch series connection |
| CN107727989A (en) * | 2017-10-10 | 2018-02-23 | 大唐国际发电股份有限公司北京高井热电厂 | The test method of oil-gas casing structure transformer |
| CN111337750B (en) * | 2020-02-11 | 2021-12-21 | 深圳供电局有限公司 | Method and device for synchronously testing direct resistance of three-phase winding of cable outgoing type transformer |
| CN112731210B (en) * | 2020-12-09 | 2021-12-17 | 江苏核电有限公司 | Main transformer electrical preventive test method without dismantling high-voltage side GIS |
| CN112683508B (en) * | 2020-12-21 | 2022-08-05 | 江苏恒高电气制造有限公司 | Gas insulation transmission line contact life test device |
-
2008
- 2008-08-29 CN CN2008101370443A patent/CN101368995B/en not_active Expired - Fee Related
Non-Patent Citations (5)
| Title |
|---|
| JP特开平8-136597A 1996.05.31 |
| 刘辉,邓伟业.500 kV主变压器不拆高压引线进行预防性试验的方法.广西电力技术.1999,(02), * |
| 姚冬雁.330kV变压器不拆引线的试验方法.宁夏电力.2007,(01), * |
| 李志斌,杨旭东.500kV变压器不拆高压引线进行预防性试验方法的探讨.黑龙江电力.2005,27(01), * |
| 王以京.不拆高压引线进行500kV设备预试.中国电力.1993,(09), * |
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Owner name: STATE GRID CORPORATION OF CHINA Effective date: 20121121 |
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Effective date of registration: 20121121 Address after: 161005 Qigihar city of Heilongjiang Province, Longsha District South Road No. 288 Patentee after: Qiqihaer Electric Power Bureau Patentee after: State Grid Corporation of China Address before: 161005 Qigihar city of Heilongjiang Province, Longsha District South Road No. 288 Patentee before: Qiqihaer Electric Power Bureau |
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