CN112731210B - Main transformer electrical preventive test method without dismantling high-voltage side GIS - Google Patents
Main transformer electrical preventive test method without dismantling high-voltage side GIS Download PDFInfo
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- CN112731210B CN112731210B CN202011451980.9A CN202011451980A CN112731210B CN 112731210 B CN112731210 B CN 112731210B CN 202011451980 A CN202011451980 A CN 202011451980A CN 112731210 B CN112731210 B CN 112731210B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/62—Testing of transformers
Abstract
The invention belongs to the technical field of electrical tests, and particularly relates to a main transformer electrical preventive test method without disassembling a high-voltage side GIS. The method can quickly realize the main transformer electrical preventive test work with the high-voltage side in the GIS structure type, effectively improve the test efficiency, shorten the overhaul period of the main transformer and reduce the safety risk of personnel electric shock and equipment damage.
Description
Technical Field
The invention belongs to the technical field of electrical tests, and particularly relates to a main transformer electrical preventive test method without disassembling a high-voltage side GIS.
Background
At present, large-scale oil-immersed transformers at home and abroad adopt a three-phase split structure, low-voltage side windings of three transformers are connected into a triangle through a closed bus, high-voltage side windings are in star connection, the high-voltage side of each transformer is directly connected with a GIS, and the tail end of each transformer is directly grounded through the GIS with the voltage level of 110 kV.
When the transformer electrical preventive test is actually carried out, due to the special structure, the test flow is generally adopted as follows:
preparing the equipment state and the test instrument in advance on a test site; contacting an operator to disconnect an earthing switch in the high-voltage side GIS switching station; disconnecting the grounding connection sheet of the local grounding switch at the high-voltage side of the main transformer, and measuring the direct-current resistance of the high-voltage and low-voltage windings by the aviation plug; restoring a grounding connection sheet and an aviation plug of a local grounding switch at the high-voltage side of the main transformer; contacting operating personnel to disconnect the main transformer local grounding switch; measuring the integral insulation resistance and the dielectric loss tangent value tg delta of the three-phase main transformer high-voltage winding at the neutral point grounding end; switching on a local grounding switch at the high-voltage side of the transformer; measuring the insulation resistance and dielectric loss of the low-voltage winding; measuring the insulation resistance and dielectric loss of the end screens of the high-voltage bushing and the neutral point bushing; measuring the insulation resistance of the iron core and the clamping piece; disconnecting the grounding connecting sheet of the local grounding switch at the high-voltage side of the main transformer and the aviation plug to perform a direct-current demagnetization test; restoring a grounding connection sheet and an aviation plug of a local grounding switch at the high-voltage side of the main transformer; closing a nearby grounding switch in a transformer high-voltage side GIS switch station; and finishing the work.
However, the above test procedures have a number of problems, including:
1. the operation of the switch station internal grounding switch by operators for multiple times is involved, and the operators have multiple work tasks during the overhaul period of the unit, so that the time consumption of the whole test process is longer;
2. the grounding connecting sheet and the aviation plug assembly of the on-site grounding switch are required to be disassembled and assembled for many times in each main transformer test, so that the contact pin is easy to damage, and the risk that the grounding switch cannot be used due to poor contact of the contact pin exists;
3. the local grounding switch to be operated is positioned in the GIS switching station and is far away from the main transformer site, and when the test is carried out, a plurality of people need to be arranged to be matched in two groups, so that the consumed labor cost is high;
4. the on-site maintenance personnel of the transformer and the maintenance personnel at the switch station need to communicate remotely, the condition of inconvenient communication exists in the process of confirming the state of the equipment and the test, and the potential safety hazard of electric shock of the personnel and equipment damage exists in the test process.
Disclosure of Invention
The invention aims to provide a main transformer electrical preventive test method without disassembling a high-voltage side GIS, which can quickly realize main transformer electrical preventive test work with a GIS structure type on the high-voltage side, effectively improve test efficiency, shorten the overhaul period of the main transformer and reduce the safety risk of electric shock of personnel and equipment damage.
The technical scheme for realizing the purpose of the invention is as follows: a main transformer electrical preventative test method without dismantling a high side GIS, the method comprising the steps of:
step (1), confirming that the low-voltage side flexible connection, the neutral point GIS and the neutral point grounding point of the main transformer are disconnected;
step (2), confirming that the local grounding switch is in a closing state and the local isolating switch is in a breaking state under the isolation and maintenance state of the main transformer, and measuring a test project which is not limited by conditions;
step (3) carrying out a transmission test window by utilizing the local isolating switch and the local grounding switch, placing the local grounding switch in a brake-off state, and measuring a test project of the brake-off state of the local grounding switch when the isolating switch is in the brake-off state;
step (4), the in-situ grounding switch is placed in a switching-on state, any two phases of in-situ grounding switch grounding connecting pieces and aviation control plugs thereof in the A-phase main transformer, the B-phase main transformer and the C-phase main transformer are removed, and measurement of a switching-on state test project of the in-situ grounding switch is carried out;
and (5) recovering the grounding connecting sheet of the local grounding switch and the aviation control plug thereof, and finishing the test.
The unconditional test items include: measuring insulation resistance and dielectric loss tangent value tg delta of the low-voltage winding; measuring the insulation resistance and the dielectric loss tangent value tg delta of the end screen of the high-voltage bushing; measuring the insulation resistance and the dielectric loss tangent value tg delta of the neutral point sleeve end screen; and measuring the insulation resistance of the iron core and the clamping piece.
The grounding switch opening state test project comprises the following steps: and measuring the insulation resistance and the dielectric loss tangent value tg delta of the high-voltage winding.
The test items of the closing state of the grounding switch comprise: measuring direct-current resistance of the high-voltage winding and performing direct-current demagnetization test; direct current resistance measurement and direct current demagnetization test of the low-voltage winding.
The invention has the beneficial technical effects that:
1. according to the main transformer electrical preventive test method without dismantling the high-voltage side GIS, test items are optimized into three types, namely, an on-site grounding switch opening state test item, an on-site grounding switch closing state test item and a test item which is not limited by conditions by using the wiring characteristics of each test item of the main transformer, so that the operation times of the on-site grounding switch are effectively reduced;
2. according to the main transformer electrical preventive test method without disassembling the high-voltage side GIS, the existing on-site isolating switch which is independently arranged in the transformer area of the main transformer high-voltage side GIS is utilized, and the isolating switch and the grounding switch which are required to be operated by the transformer electrical preventive test are operated by utilizing the transmission test windows of the isolating switch and the grounding switch which are carried out by maintenance personnel, so that the operation by operating personnel is avoided, the matching interfaces required by the test are reduced, the working efficiency of matching operation is improved, the time consumption of the main transformer electrical preventive test is greatly shortened, and the labor cost required by the test is effectively reduced;
3. according to the main transformer electrical preventive test method without disassembling the high-voltage side GIS, disclosed by the invention, matched with the situation that test operators are all located in a transformer test area, the traps caused by human errors can be reduced practically, the personal safety of the test operators is ensured, and the equipment damage risk caused by the test misoperation is reduced.
Drawings
FIG. 1 is a schematic diagram of electrical connections of a main transformer;
in the figure: 1. a phase A main transformer; 2. a B-phase main transformer; 3. a C-phase main transformer; 4. a low voltage lead-out wire; 5. a neutral point GIS; 6. a neutral point grounding point; 7. a high-voltage side GIS; 8. an in-situ isolating switch; 9. a local grounding switch; 10. the local grounding switch is connected with a grounding piece; 11. switching the ground point in situ; 12. a switch station side disconnecting switch; 13. a switch station side grounding switch; 14. the grounding connection piece of the switch station side grounding switch; 15. a switch station side grounding switch grounding point; 16. a GIS switching station; 17. the low-voltage side is in flexible connection; 18. a low voltage enclosed bus; 19. a neutral point outgoing line; 20. a high voltage lead-out wire; 21. a GIS bus; 22. and a neutral GIS bus.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
As shown in fig. 1, the main transformer includes: the system comprises an A-phase main transformer 1, a B-phase main transformer 2, a C-phase main transformer 3, a low-voltage outgoing line 4, a neutral point GIS5, a high-voltage side GIS7, a GIS switching station 16, a low-voltage side flexible connection 17, a low-voltage closed bus 18, a neutral point outgoing line 19 and a high-voltage outgoing line 20;
the neutral point GIS5 includes: a neutral GIS bus 22 and a neutral grounding point 6;
high-voltage side GIS7 includes: the GIS bus 21, the local isolating switch 8, the local grounding switch 9, the local grounding switch grounding connecting sheet 10 and the local switch grounding point 11;
the GIS switchyard 16 includes: the system comprises a switch station side isolating switch 12, a switch station side grounding switch 13, a switch station side grounding switch grounding connecting piece 14, a switch station side grounding switch grounding point 15 and a GIS bus 21.
The phase A main transformer 1, the phase B main transformer 2 and the phase C main transformer 3 of the three-phase main transformer are respectively connected with a GIS bus 21 through high-voltage outgoing lines 20 to realize the connection with a high-voltage side GIS 7; the neutral point lead wire 19 is connected to the neutral point GIS bus 22, and is connected to the neutral point GIS 5.
The three-phase high-voltage side GIS7 are connected to the GIS switchyard 16.
The ground terminal of the neutral GIS bus 22 is connected to the neutral ground 6.
The transformer low-voltage outgoing line 4 is connected with a closed bus 18 through a low-voltage side flexible connection 17, the transformer end of the local isolating switch 8 is connected with a GIS bus 21, the bus end of the local grounding switch 9 is connected with the GIS bus 21 close to the transformer end, the grounding end of the local grounding switch 9 is connected with the non-grounding end of the local grounding switch grounding connecting piece 10, and the grounding end of the local grounding switch grounding connecting piece 10 is connected with the local switch grounding point 11.
The switch station end of the local isolating switch 8 is connected with the transformer end of the GIS bus 21, the transformer end of the switch station side isolating switch 12 is connected with the switch station end of the GIS bus 21, and the switch station end of the switch station side isolating switch 12 is connected with the GIS bus 21 and is connected into a GIS switch station 16 system.
The bus terminal of the switch station side ground switch 13 is connected to the GIS bus 21 near the switch station end, the ground terminal of the switch station side ground switch 13 is connected to the non-ground terminal of the switch station side ground switch ground connection piece 14, and the ground terminal of the switch station side ground switch ground connection piece 14 is connected to the switch station side ground switch ground point 15.
The transformer is provided with an in-situ isolating switch 8 and an in-situ grounding switch 9 in a high-voltage side GIS (transformer area) independently, and as GIS equipment is of a fully-closed structure and a test wiring cannot be directly connected with a high-voltage side winding of the transformer in a conventional maintenance state, measurement of direct-current resistance of the high-voltage winding and a direct-current demagnetization test need to be carried out under the condition that the high-voltage side in-situ grounding switch 9 of the transformer is closed and an in-situ grounding switch grounding connecting sheet 10 is opened, and measurement of insulation resistance of the high-voltage winding and a dielectric loss tangent value tg delta needs to be disconnected from the in-situ grounding switch 9. Therefore, the transformer high-voltage side local grounding switch 9 needs to be opened or disconnected.
The invention reasonably optimizes the test items by utilizing the wiring characteristics of each test item of the main transformer and reduces the operation times of the on-site grounding switch 9. The method comprises the following specific steps:
as shown in fig. 1, the method for testing electrical precautionary performance of a main transformer without disassembling a high-voltage side GIS provided by the invention comprises the following steps:
step (1), confirming that the low-voltage side flexible connection 17, the neutral point GIS5 and the neutral point grounding point 6 of the main transformer are disconnected;
step (2), confirming that the local grounding switch 9 is in a closing state and the local isolating switch 8 is in a breaking state under the isolation and maintenance state of the main transformer, and measuring a test project without condition limitation;
step (3), a transmission test window is carried out by utilizing the local isolating switch 8 and the local grounding switch 9, the local grounding switch 9 is placed in a brake-off state, the isolating switch 8 is in the brake-off state, and measurement of a test project of the brake-off state of the local grounding switch is carried out;
step (4), the in-situ grounding switch 9 is placed in a switching-on state, any two phases of in-situ grounding switch grounding connecting pieces 10 and aviation control plugs thereof in the A-phase main transformer, the B-phase main transformer and the C-phase main transformer are removed, and measurement of a switching-on state test project of the in-situ grounding switch is carried out;
and (5) restoring the grounding connecting sheet 10 of the local grounding switch and the aviation control plug thereof, and finishing the test.
The unconditional test items include: measuring insulation resistance and dielectric loss tangent value tg delta of the low-voltage winding; measuring the insulation resistance and the dielectric loss tangent value tg delta of the end screen of the high-voltage bushing; measuring the insulation resistance and the dielectric loss tangent value tg delta of the neutral point sleeve end screen; and measuring the insulation resistance of the iron core and the clamping piece.
The grounding switch opening state test project comprises the following steps: and measuring the insulation resistance and the dielectric loss tangent value tg delta of the high-voltage winding.
The test items of the closing state of the grounding switch comprise: measuring direct-current resistance of the high-voltage winding and performing direct-current demagnetization test; direct current resistance measurement and direct current demagnetization test of the low-voltage winding.
The present invention has been described in detail with reference to the drawings and examples, but the present invention is not limited to the examples, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present invention. The prior art can be adopted in the content which is not described in detail in the invention.
Claims (4)
1. A main transformer electrical preventive test method without dismantling a high-voltage side GIS is characterized by comprising the following steps:
step (1), confirming that the low-voltage side flexible connection, the neutral point GIS and the neutral point grounding point of the main transformer are disconnected;
step (2), confirming that the local grounding switch is in a closing state and the local isolating switch is in a breaking state under the isolation and maintenance state of the main transformer, and measuring a test project which is not limited by conditions;
step (3) carrying out a transmission test window by utilizing the local isolating switch and the local grounding switch, placing the local grounding switch in a brake-off state, and measuring a test project of the brake-off state of the local grounding switch when the isolating switch is in the brake-off state;
step (4), the in-situ grounding switch is placed in a switching-on state, any two phases of in-situ grounding switch grounding connecting pieces and aviation control plugs thereof in the A-phase main transformer, the B-phase main transformer and the C-phase main transformer are removed, and measurement of a switching-on state test project of the in-situ grounding switch is carried out;
and (5) recovering the grounding connecting sheet of the local grounding switch and the aviation control plug thereof, and finishing the test.
2. The method for main transformer electrical preventive test without dismantling high side GIS according to claim 1, wherein the unconditional test items include: measuring insulation resistance and dielectric loss tangent value tg delta of the low-voltage winding; measuring the insulation resistance and the dielectric loss tangent value tg delta of the end screen of the high-voltage bushing; measuring the insulation resistance and the dielectric loss tangent value tg delta of the neutral point sleeve end screen; and measuring the insulation resistance of the iron core and the clamping piece.
3. The method for testing the electrical precaution of the main transformer without disassembling the high-side GIS according to claim 1, wherein the grounding switch opening state test items comprise: and measuring the insulation resistance and the dielectric loss tangent value tg delta of the high-voltage winding.
4. The method for testing the electrical precautionary performance of the main transformer without disassembling the high-side GIS according to claim 1, wherein the grounding switch closing state test items comprise: measuring direct-current resistance of the high-voltage winding and performing direct-current demagnetization test; direct current resistance measurement and direct current demagnetization test of the low-voltage winding.
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| CN202011451980.9A CN112731210B (en) | 2020-12-09 | 2020-12-09 | Main transformer electrical preventive test method without dismantling high-voltage side GIS |
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| CN202011451980.9A CN112731210B (en) | 2020-12-09 | 2020-12-09 | Main transformer electrical preventive test method without dismantling high-voltage side GIS |
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| CN112731210B true CN112731210B (en) | 2021-12-17 |
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| CN113899996B (en) * | 2021-10-08 | 2023-11-14 | 江苏安靠智能输电工程科技股份有限公司 | On-spot high voltage insulation test device |
| CN113777456B (en) * | 2021-10-08 | 2023-07-04 | 江苏安靠智能输电工程科技股份有限公司 | Full-closed gas-insulated high-voltage switch field insulation test device |
| CN113917300B (en) * | 2021-10-08 | 2023-06-27 | 江苏安靠智能输电工程科技股份有限公司 | Direct connection device of gas-insulated high-voltage switch and power transformer |
| CN114217183A (en) * | 2021-11-25 | 2022-03-22 | 广东电网有限责任公司广州供电局 | GIS cable device |
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| WO2016005618A1 (en) * | 2014-07-10 | 2016-01-14 | Ormazabal Y Cia, S.L.U. | Cable testing device and method |
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| CN101368995B (en) * | 2008-08-29 | 2011-07-13 | 齐齐哈尔电业局 | Non-head dismantling test method for GIS combined electrical apparatus and plug-pull type transformer |
| 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 |
| 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 |
| CN104215835A (en) * | 2014-09-18 | 2014-12-17 | 杭州西湖电子研究所 | Automatic measuring system for main transformer |
| CN107367637A (en) * | 2017-07-14 | 2017-11-21 | 国网福建省电力有限公司 | The automatic testing method of Transformer Winding insulaion resistance and dielectric loss detecting instrument |
| CN107894548A (en) * | 2017-12-21 | 2018-04-10 | 中国能源建设集团华东电力试验研究院有限公司 | The high-power transformer test method that high-pressure side is directly connected with GIS |
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| CN101881813A (en) * | 2010-06-17 | 2010-11-10 | 国网电力科学研究院 | Method for simulating GIS transformer substation to produce very fast transient overvoltage (VFTO) and test circuit |
| CN103487780A (en) * | 2013-09-09 | 2014-01-01 | 国家电网公司 | System and method for testing GIS electronic transformer |
| WO2016005618A1 (en) * | 2014-07-10 | 2016-01-14 | Ormazabal Y Cia, S.L.U. | Cable testing device and method |
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