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Method for testing 110kV capacitive voltage transformer without disassembling lead

A voltage transformer without removing the lead wire technology, which is applied in the test field of 110kV capacitive voltage transformer without removing the lead wire. Intensity reduction, precisely measured effects

Pending Publication Date: 2021-03-12
GUIZHOU POWER GRID CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, when detecting the test current flowing through the capacitive voltage transformer, it is necessary to remove the lead wire once at a high altitude, resulting in low work efficiency, the risk of personnel falling from a high place, and there may be poor contact when removing and restoring the lead wire, which may lead to hidden dangers of equipment heating

Method used

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  • Method for testing 110kV capacitive voltage transformer without disassembling lead
  • Method for testing 110kV capacitive voltage transformer without disassembling lead
  • Method for testing 110kV capacitive voltage transformer without disassembling lead

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Embodiment 1

[0044] refer to Figure 1 ~ Figure 3, is the first embodiment of the present invention, this embodiment provides 110kV capacitive voltage transformer test method without removing the lead wires, including:

[0045] S1: The test current flowing through the primary lead wire is converted into a secondary current through a feed-through current transformer.

[0046] Change the feed-through current transformer from the top of the primary lead to the low-voltage secondary terminal. The primary lead of the feed-through current transformer is connected to the XL terminal current and the reverse N terminal current, and the subtraction of the two is to flow once. Current at the leads:

[0047] I C1 =I XL -I C2

[0048] Among them, I C1 is the test current of the primary lead, I C2 Connect the reverse N-terminal current to the primary lead wire of the feed-through current transformer, I XL It is the current connected to the XL terminal for the primary lead wire of the feedthrough...

Embodiment 2

[0073] In order to verify and explain the technical effect adopted in this method, this embodiment chooses the traditional method of removing the lead wire and adopts this method to conduct a comparative test, and compares the test results by means of scientific demonstration to verify the real effect of this method.

[0074] The traditional lead wire removal method: the work intensity of removing and restoring the lead wire is high, the lead wire connection of the primary lead wire is relatively firm, and the staff needs to climb up to operate; it takes a long time to remove the lead wire and restore the lead wire during the whole test process; the personal risk factor is high, and a large number of high-altitude operations For example, there is a greater risk of personnel falling; there are certain hidden dangers of equipment, because the high-voltage lead wires are corroded during the operation of outdoor equipment, so when the lead wires are restored, the lead wires may not ...

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Abstract

The invention discloses a method for testing 110kV capacitive voltage transformer without disassembling a lead. The method comprises the steps of: converting test current flowing through a primary lead into secondary current through a straight-through current transformer; amplifying the secondary current of the straight-through current transformer by using a negative feedback amplifying circuit, and shielding and protecting the straight-through current transformer through an all-metal shielding cover; and connecting the amplified straight-through current transformer to a penicillin bridge, andcalculating the main capacitance, the voltage division capacitance, the main capacitance dielectric loss factor and the voltage division capacitance dielectric loss factor of the straight-through current transformer. With the method of the invention adopted, the high-voltage lead does not need to be dismounted and recovered, high-place operation is not needed, the working intensity is greatly reduced, and the falling risk of high-place operation is eliminated; and meanwhile, accurate measurement of capacitance and dielectric loss can be realized.

Description

technical field [0001] The invention relates to the technical field of electric power industry and electrical test, in particular to a test method for a 110kV capacitive voltage transformer without removing lead wires. Background technique [0002] In the power system, according to the maintenance and pre-test regulations, it is necessary to test the 110kV capacitive voltage transformer regularly. The existing test method is to use the Xilin bridge to measure the test current flowing through the capacitive voltage transformer. Capacitive voltage transformer capacitance and dielectric loss value. [0003] However, when detecting the test current flowing through the capacitive voltage transformer, it is necessary to remove the lead wire once at a high altitude, resulting in low work efficiency, the risk of personnel falling from a high place, and there may be potential heating hazards caused by poor contact when the lead wire is removed and restored. Contents of the inventio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/26G01R35/00G01R1/30G01R1/18
CPCG01R27/2605G01R27/2694G01R35/00G01R1/30G01R1/18
Inventor 周林波石平灯田滔杨顺王雪文峰王瑞果张霖史纯青李玉芬
Owner GUIZHOU POWER GRID CO LTD
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