CN107462788A - A kind of method of testing of 500kV auto-transformers D.C. resistance - Google Patents
A kind of method of testing of 500kV auto-transformers D.C. resistance Download PDFInfo
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- CN107462788A CN107462788A CN201710581834.XA CN201710581834A CN107462788A CN 107462788 A CN107462788 A CN 107462788A CN 201710581834 A CN201710581834 A CN 201710581834A CN 107462788 A CN107462788 A CN 107462788A
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/08—Measuring resistance by measuring both voltage and current
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- General Physics & Mathematics (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
The present invention relates to DCR of Transformer technical field of measurement and test, there is provided a kind of method of testing of 500kV auto-transformers D.C. resistance.The test electric current I+ ends of instrument for measuring DC resistance and test voltage U+ ends are connected to the joint of the high pressure neutral bushing of 500kV auto-transformers by the present invention；The test electric current I ends of instrument for measuring DC resistance are connected to and are connected with grounding net of transformer substation at good ground connection band iron；The test voltage U ends of instrument for measuring DC resistance are connected at the contact of high-altitude test clamp；High-altitude test clamp is articulated in the joint of the high-pressure side sleeve pipe of 500kV auto-transformers；Close high-pressure side grounding switch；Read the current value I of instrument for measuring DC resistance output and test obtained magnitude of voltage U, pass through Ohm's lawObtain the DC resistance of 500kV auto-transformers.The present invention can meet live actual job environment, not need altitude operation vehicle again, it is not required that the p-wire for operation of ascending a height, improve operating efficiency.
Description
Technical field
The present invention relates to DCR of Transformer technical field of measurement and test, and in particular to a kind of 500kV auto-transformers direct current
The method of testing of resistance.
Background technology
500kV auto-transformers are the hinges of power system main grid structure, to the importance of grid power transmission passage stable operation
It is self-evident.And winding D.C. resistance measurement belongs to the routine test of transformer, in transformer manufacturing process, dispatch from the factory, join, transport
The measurement of D.C. resistance will be carried out during dimension, to examine whether galvanic circle connects well.
Because 500kV auto-transformers high-pressure side sleeve pipe is all very tall and big, on-the-spot test is mainly by high-altitude operation vehicle, by height
Working platform is increased to the joint of high-pressure side sleeve pipe, could remove the lead at the sleeve pipe of high-pressure side, and covered in high-pressure side
The p-wire of instrument for measuring DC resistance is mounted on the joint of pipe.Using high-altitude operation vehicle disconnect the method for line not only increase test into
Sheet and working time, the risk that job platform hits transformer high-voltage bushing also be present.
Though patent CN101769961A is improved to method of testing, it is possible to achieve in the case of without disconnecting power lead, to becoming
Depressor D.C. resistance is tested, but this method needs to utilize main transformer high and low pressure side bus, and DCR of Transformer is carried out at scene
Can not generally accomplish during test bus simultaneously interruption maintenance, and this method after the completion of test, it is necessary to the test result that will be obtained
Bus DC resistance is subtracted, further increases measurement error.
The content of the invention
In order to solve the above problems, the invention provides a kind of method of testing of 500kV auto-transformers D.C. resistance, tool
Body technique scheme is as follows：
A kind of method of testing of 500kV auto-transformers D.C. resistance comprises the following steps：
（1）The test electric current I+ ends of instrument for measuring DC resistance and test voltage U+ ends are connected to the high pressure of 500kV auto-transformers
The joint of neutral bushing；
（2）The test electric current I- ends of instrument for measuring DC resistance are connected to and are connected with grounding net of transformer substation at good ground connection band iron；
（3）The test voltage U- ends of instrument for measuring DC resistance are connected at the contact of high-altitude test clamp；
（4）High-altitude test clamp is articulated in the joint of the high-pressure side sleeve pipe of 500kV auto-transformers；
（5）Read the current value I of instrument for measuring DC resistance output and test obtained magnitude of voltage U, pass through Ohm's lawObtain the DC resistance of 500kV auto-transformers.
Further, before testing, the medium voltage side sleeve pipe of 500kV auto-transformers, high pressure neutral bushing, low-pressure side sleeve pipe
Need to need to disconnect with power network with power network and grounding net of transformer substation disconnection, the high-pressure side sleeve pipe of 500kV auto-transformers, close height
Press side grounding switch.
Further, the core for the p-wire that the test electric current I- ends of instrument for measuring DC resistance, test electric current I+ ends use is
Fine copper material, core cross-sectional area are not less than 10mm2, it is allowed to the electric current passed through is not less than 50A.
The invention provides a kind of method of testing of 500kV auto-transformers D.C. resistance, this method can meet scene
Actual job environment, and can are enough implemented without altitude operation vehicle, it is not required that the p-wire for operation of ascending a height, improve test
The processing safety of DCR of Transformer, saves testing cost and testing time, improves operating efficiency.
Brief description of the drawings
Fig. 1 is the test wiring schematic diagram of the present invention；
Wherein：1：Instrument for measuring DC resistance, 11：Test voltage U+ ends, 12：Test voltage U- ends, 13：Test electric current I+ ends, 14：
Test electric current I- ends；
2nd, 500kV auto-transformers, 21：High-pressure side sleeve pipe, 22：Medium voltage side sleeve pipe, 23：Low-pressure side sleeve pipe, 24：High pressure neutral point
Sleeve pipe,
3rd, high-altitude test clamp, 4, high-pressure side grounding switch, 5, grounding net of transformer substation, 6, ground connection band iron.
Embodiment
In order to be better understood from the present invention, the invention will be further described with specific embodiment below in conjunction with the accompanying drawings：
As shown in figure 1, disconnecting each side disconnecting switch of 500kV auto-transformers 2, the medium voltage side set of 500kV auto-transformers 2 is removed
Pipe 22, high pressure neutral bushing 24, the lead at low-pressure side sleeve pipe 23, make 500kV auto-transformers 2 medium voltage side sleeve pipe 22,
High pressure neutral bushing 24, low-pressure side sleeve pipe 23 and power network and grounding net of transformer substation 5 disconnect, the high pressure of 500kV auto-transformers 2
Side sleeve pipe 21 disconnects with power network, closes high-pressure side grounding switch 4.
A kind of method of testing of 500kV auto-transformers D.C. resistance comprises the following steps：
（1）The test electric current I+ ends 13 of instrument for measuring DC resistance 1 and test voltage U+ ends 11 are connected to 500kV auto-transformers 2
High pressure neutral bushing 24 joint；
（2）The test electric current I- ends 14 of instrument for measuring DC resistance 1 are connected to good ground connection band iron is connected with grounding net of transformer substation 5
At 6；
（3）The test voltage U- ends 12 of instrument for measuring DC resistance 1 are connected at the contact of high-altitude test clamp 3；
（4）High-altitude test clamp 3 is articulated on the joint of high-pressure side sleeve pipe 21 of 500kV auto-transformers 2 by lifting bar operation,
Make the junction contacts of the test voltage U- ends 12 of instrument for measuring DC resistance 1 and the high-pressure side sleeve pipe 21 of 500kV auto-transformers 2；
（5）Utilize the lead and high-pressure side grounding switch 4, grounding net of transformer substation of the high-pressure side sleeve pipe 21 of 500kV auto-transformers 2
5 form tested current loop, from the joint of the high-pressure side sleeve pipe 21 of 500kV auto-transformers 2 and 500kV auto-transformers 2
High pressure neutral bushing 24 joint obtain test voltage signal；
（6）Read the current value I of the output of instrument for measuring DC resistance 1 and test obtained magnitude of voltage U, pass through Ohm's lawObtain the DC resistance of 500kV auto-transformers 2.
The core for the p-wire that test electric current I- ends 14, the test electric current I+ ends 13 of instrument for measuring DC resistance 1 use is pure
Copper material, core cross-sectional area are not less than 10mm2, it is allowed to the electric current passed through is not less than 50A.
The present invention is not limited to above-described embodiment, the foregoing is only the preferable case study on implementation of the present invention
, it is not intended to limit the invention, any modification for being made within the spirit and principles of the invention, equivalent substitution and changes
Enter, should be included in the scope of the protection.
Claims (3)
- A kind of 1. method of testing of 500kV auto-transformers D.C. resistance, it is characterised in that：Comprise the following steps：（1）The test electric current I+ ends of instrument for measuring DC resistance and test voltage U+ ends are connected to the high pressure of 500kV auto-transformers The joint of neutral bushing；（2）The test electric current I- ends of instrument for measuring DC resistance are connected to and are connected with grounding net of transformer substation at good ground connection band iron；（3）The test voltage U- ends of instrument for measuring DC resistance are connected at the contact of high-altitude test clamp；（4）High-altitude test clamp is articulated in the joint of the high-pressure side sleeve pipe of 500kV auto-transformers；（5）Read the current value I of instrument for measuring DC resistance output and test obtained magnitude of voltage U, pass through Ohm's law Obtain the DC resistance of 500kV auto-transformers.
- A kind of 2. method of testing of 500kV auto-transformers D.C. resistance according to claim 1, it is characterised in that： Before test, medium voltage side sleeve pipe, high pressure neutral bushing, low-pressure side sleeve pipe and the power network of 500kV auto-transformers and transformer station connect Earth mat disconnects, and high-pressure side sleeve pipe and the power network of 500kV auto-transformers disconnect, and close high-pressure side grounding switch.
- A kind of 3. method of testing of 500kV auto-transformers D.C. resistance according to claim 1, it is characterised in that：Directly The core for the p-wire that test electric current I- ends, the test electric current I+ ends of leakage resistance tester use is fine copper material, and core is transversal Area is not less than 10mm2, it is allowed to the electric current passed through is not less than 50A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710581834.XA CN107462788A (en) | 2017-07-17 | 2017-07-17 | A kind of method of testing of 500kV auto-transformers D.C. resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710581834.XA CN107462788A (en) | 2017-07-17 | 2017-07-17 | A kind of method of testing of 500kV auto-transformers D.C. resistance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107462788A true CN107462788A (en) | 2017-12-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710581834.XA Pending CN107462788A (en) | 2017-07-17 | 2017-07-17 | A kind of method of testing of 500kV auto-transformers D.C. resistance |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110108943A (en) * | 2019-06-03 | 2019-08-09 | 国网青海省电力公司检修公司 | Drainage thread measuring transformer dielectric loss, the method for capacitance and insulation resistance are not disassembled |
| CN112345831A (en) * | 2020-10-30 | 2021-02-09 | 广东电网有限责任公司广州供电局 | Direct-current resistance measuring device of ultra-high voltage transformer |
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| CN202013380U (en) * | 2011-03-17 | 2011-10-19 | 重庆市电力公司长寿供电局 | Device for testing DC resistance of 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 |
| CN104749440A (en) * | 2015-04-03 | 2015-07-01 | 国家电网公司 | Large power transformer direct-current resistance fast testing method |
| CN105842541A (en) * | 2016-04-12 | 2016-08-10 | 贵州电网有限责任公司都匀供电局 | Rapid testing apparatus and testing method for large scale transformer's direct current resistance |
| CN205749582U (en) * | 2016-05-19 | 2016-11-30 | 贵州电网有限责任公司毕节供电局 | Transformer testing clamps |
| CN106771802A (en) * | 2016-11-29 | 2017-05-31 | 国家电网公司 | DCR of Transformer exception analysis method based on failure dot circuit |
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2017
- 2017-07-17 CN CN201710581834.XA patent/CN107462788A/en active Pending
Patent Citations (6)
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|---|---|---|---|---|
| CN202013380U (en) * | 2011-03-17 | 2011-10-19 | 重庆市电力公司长寿供电局 | Device for testing DC resistance of 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 |
| CN104749440A (en) * | 2015-04-03 | 2015-07-01 | 国家电网公司 | Large power transformer direct-current resistance fast testing method |
| CN105842541A (en) * | 2016-04-12 | 2016-08-10 | 贵州电网有限责任公司都匀供电局 | Rapid testing apparatus and testing method for large scale transformer's direct current resistance |
| CN205749582U (en) * | 2016-05-19 | 2016-11-30 | 贵州电网有限责任公司毕节供电局 | Transformer testing clamps |
| CN106771802A (en) * | 2016-11-29 | 2017-05-31 | 国家电网公司 | DCR of Transformer exception analysis method based on failure dot circuit |
Non-Patent Citations (2)
| Title |
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| 张建国等: "《高压带暖气试验》", 31 January 2003, 中国电力出版社 * |
| 邢继宏等: "琅琊山电厂封闭式电缆连接的220kV变压器不拆头预防性试验研究与实施", 《华东电力》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110108943A (en) * | 2019-06-03 | 2019-08-09 | 国网青海省电力公司检修公司 | Drainage thread measuring transformer dielectric loss, the method for capacitance and insulation resistance are not disassembled |
| CN112345831A (en) * | 2020-10-30 | 2021-02-09 | 广东电网有限责任公司广州供电局 | Direct-current resistance measuring device of ultra-high voltage transformer |
| CN112345831B (en) * | 2020-10-30 | 2023-01-20 | 广东电网有限责任公司广州供电局 | Direct-current resistance measuring device of ultra-high voltage transformer |
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Application publication date: 20171212 |