Method for testing transformer equipment without disassembling lead

A technology that does not remove lead wires and test methods. It is applied to instruments, measuring electrical variables, and measuring current/voltage. It can solve problems such as difficulty and strength, and low safety and reliability.

Inactive Publication Date: 2013-10-02
MAINTENANCE BRANCH STATE GRID LIAONING ELECTRIC POWER +1
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0003] Purpose of the invention: The present invention provides a test method for transformer equipment without removing the lead wires, the purpose of which is to solve the problems of difficulty, high strength, low safety and reliability existing in previous methods

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  • Method for testing transformer equipment without disassembling lead
  • Method for testing transformer equipment without disassembling lead
  • Method for testing transformer equipment without disassembling lead

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specific Embodiment approach

[0032] The invention provides a test method for transformer equipment without removing lead wires. The method includes the measurement of oil-immersed transformers and oil-immersed shunt reactors. The steps of the method are as follows:

[0033] (1) Test the oil-immersed transformer:

[0034] During the transformer test, the neutral point and low-voltage side bushing lead-out wires should be disassembled and fixed with insulating tape. In addition, the iron core of the transformer and the grounding wire of the clip should be disassembled;

[0035] ①. Use the shielding method to measure the insulation resistance, absorption ratio and polarization index of oil-immersed transformer windings: when testing high-voltage windings, medium-voltage windings and iron cores, low-voltage windings are grounded and the shell is shielded; when testing low-voltage windings and iron cores, high-voltage The winding and medium voltage winding are grounded, and the shell is shielded; when testin...

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Abstract

The invention provides a method for testing transformer equipment without disassembling a lead, which comprises measurement for an oil-immersed transformer and an oil-immersed shunt reactor. The test of the oil-immersed transformer comprises the steps of (1) measuring insulation resistance, an absorption ratio and a polarization index of an oil-immersed transformer winding by adopting a shielding method; (2) testing a dielectric loss factor of the winding; (3) testing a capacitive sleeve and the capacitance; and (4) measuring leakage current of the winding. The test of the oil-immersed shunt reactor comprises the steps of (1) measuring insulation resistance, an absorption ratio and a polarization index of a winding; (2) testing the capacitance of a body; and (3) testing the insulation resistance and the capacitance of a sleeve. The method provided by the invention shortens the test time, reduces the workload of maintenance, decreases the risk factor, reduces the cost index of regular checking, and has wide application prospects.

Description

technical field [0001] The invention relates to a test method for transformer equipment without removing lead wires, and belongs to the measurement field of transformer equipment. Background technique [0002] At present, the newly built 500 substation is relatively compact, maintenance personnel are not allowed to climb the supporting porcelain columns, and aerial work vehicles cannot enter. In particular, the lead wires of 500kV equipment are relatively thick (some use 4 splits), and it takes a lot of time to remove the lead wires, which may affect the normal pre-test time; Moreover, due to the high position of the lead wire, removing the lead wire will also have potential personal safety problems. The leads connecting the transformer bushing and arrester to the busbar are relatively short. If only the lead ends connected to the test equipment are removed, the safety distance during the high-voltage test is not enough. It increases the difficulty of operation, prolongs t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00G01R27/02G01R27/26G01R19/00
Inventor 杨雪滨范乃心刘志宇吴怀诚李越鹏陈翀窦文君孙艳鹤田野梅洪全崔怡芳李春泽马宁
Owner MAINTENANCE BRANCH STATE GRID LIAONING ELECTRIC POWER
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