Polarization/depolarization current test method for multi-layer oil-paper composite insulation structure

A composite insulation and current test technology, applied in the direction of testing dielectric strength, etc., can solve problems such as long space charge dissipation time and high-frequency interference in data processing.

Active Publication Date: 2021-07-06
STATE GRID HEILONGJIANG ELECTRIC POWER CO LTD ELECTRIC POWER RES INST +2
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  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of long space charge dissipation time and high-frequency interference in the data processing process in the existing oil-paper insulation polarization / depolarization current test, and to provide a multi-layer oil-paper composite under high voltage level. Insulation structure polarization / depolarization current test method and test device

Method used

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  • Polarization/depolarization current test method for multi-layer oil-paper composite insulation structure
  • Polarization/depolarization current test method for multi-layer oil-paper composite insulation structure
  • Polarization/depolarization current test method for multi-layer oil-paper composite insulation structure

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specific Embodiment approach 1

[0025] Specific implementation mode 1: In this implementation mode, the polarization / depolarization current test method of multi-layer oil-paper composite insulation structure under high voltage level is implemented according to the following steps:

[0026] 1. Adjust the distance between the oil gaps of the three-electrode system, insert the oil-soaked cardboard 5 into the notch of the metal support rod 7 of the three-electrode system, and the middle of the high-voltage electrode 1 and the measuring electrode 2 is a multi-layer composed of the oil gap and the oil-soaked cardboard 5 The oil-paper composite insulation structure, the three-electrode system is put into the test oil tank 9, the opening of the test oil tank 9 is covered with a cover plate 10, the test oil tank 9 is vacuumed, and then the transformer oil is vacuum injected into the test oil tank 9, and it is completed after standing still. Assembly of the test device;

[0027] 2. Apply DC high voltage to the three-e...

specific Embodiment approach 2

[0034] Embodiment 2: This embodiment differs from Embodiment 1 in that Step 2 applies a DC high voltage of 50 kV to 90 kV.

specific Embodiment approach 3

[0035] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the DC high voltage is applied in step 2, and the pressurization time is 5400s.

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Abstract

The polarization / depolarization current test method and test device of multilayer oil-paper composite insulation structure under high voltage level are used for the research on polarization / depolarization current characteristics of multilayer oil-paper composite insulation under high voltage level. In the oil-paper insulation polarization / depolarization current test, the space charge dissipation time is long, and the data processing process is subject to high-frequency interference. Test methods: 1. Assembly of the test device; 2. Apply DC high voltage to the three-electrode system to test the polarization current of the multi-layer oil-paper composite insulating structure, and then remove the DC high voltage to test the depolarization current of the multi-layer oil-paper composite insulating structure; 3. Heat the transformer oil in the test tank; 4. Use the method of piecewise linearization with unequal time intervals to process the polarization current and depolarization current obtained in step 2 respectively. The invention adopts the method of unequal time interval piecewise linearization to count the test data, which can well eliminate the high frequency interference in the test process.

Description

technical field [0001] The invention is used for the research on the polarization / depolarization current characteristics of multi-layer oil-paper composite insulation under high voltage level, and specifically relates to a polarization / depolarization current test method and a test device of oil-paper composite insulation. Background technique [0002] In recent years, the polarization / depolarization current measurement method has been applied in the field of transformer insulation state diagnosis as a non-destructive electrical measurement and diagnosis method. At present, the research on polarization / depolarization current measurement is mainly to apply a low-level DC voltage to the two insulation structures of single-layer oil-impregnated paperboard, oil gap + oil-impregnated paperboard, and judge the initial state of polarization current and depolarization current. The value, the current value at the subsequent time and the overall change trend of the current curve can be...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/12
Inventor 张健徐超李国强郭跃男孙海明周洪毅王永红庄羽金童
Owner STATE GRID HEILONGJIANG ELECTRIC POWER CO LTD ELECTRIC POWER RES INST
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