Method for testing direct current resistance of large transformer without disconnecting lead

A technology of DC resistors and transformers, which is applied in the field of transformers, can solve the problems of manpower and time-consuming, high-altitude operations are dangerous, etc., and achieve the effect of saving time and manpower

Inactive Publication Date: 2010-07-07
上海市南供电设计有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the traditional operation method needs to set up scaffolding, the staff have to disassemble and install the lead wires and operate the test clips on it. The high-altitude operation is more dangerous. It takes a lot of manpower and time to build the scaffolding and disassemble the high-voltage lead wires.

Method used

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Embodiment Construction

[0012] The present invention will be further described below.

[0013] A method of measuring the DC resistance of a large-scale transformer without removing the lead wires of the present invention uses a DC resistance tester to test the DC resistance of the transformer. During the test, a section of lead wire is included in the transformer test circuit, and the DC resistance tester is directly on a pile head of the lead wire. After the measurement is completed, subtract the resistance value of the lead wire from the obtained resistance value to obtain the DC resistance value of the transformer to be measured.

[0014] In this embodiment, the lead wire is the high and low voltage bus bar of the transformer, and to ensure that the high and low voltage bus bar needs to be disconnected from the power grid at a certain place, the neutral point grounding of the star connection of the transformer must also be disconnected.

[0015] During the measurement, the selected measuring point...

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Abstract

The invention discloses a method for testing direct current resistance of a large transformer without disconnecting a lead. In the method, a direct current resistance tester is used for testing the current resistance of the transformer, during testing, a transformer testing loop comprises a segment of lead, the current resistance tester directly carries out measurement on a node of a pile head of the lead, and after measurement is finished, the obtained resistance minus the resistance of the lead is the required direct current resistance of the transformer. The testing loop comprises a segment of lead, but the direct current resistance required to be measured is obtained by computation, thus realizing measuring the current resistance of the transformer without disconnecting the lead, saving lots of labor power and saving the time.

Description

technical field [0001] The invention relates to the field of transformers, in particular to a method for measuring the DC resistance of a large transformer without removing lead wires. technical background [0002] Transformer is one of the most important substation equipment in power system, especially the importance of large transformer in power grid is self-evident. Transformer DC resistance test (referred to as DC resistance test) is one of the most important items during handover and pre-test. Whether the contact of each position is good, whether the lead wire is broken, whether the contact between the lead wire and the bushing is good [0003] Due to the large body of the 220kV transformer and the high-voltage bushings that are high and inclined outwards, scaffolding must be erected under the high-voltage bushings when measuring DC resistance before, and then the leads on the high and low voltage sides must be removed to measure the DC resistance of the transformer. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/02G01R31/06
Inventor 李明
Owner 上海市南供电设计有限公司
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