Moisture Content Measurement Method of Transformer Insulation System

A technology of insulation system and measurement method, applied in the direction of material resistance, etc., can solve the problems affecting the reliability of the result judgment, the software technology needs to be improved, the special instrument is complicated and expensive, and achieves the effect of good maintenance, simple instrument and strong pertinence.

Active Publication Date: 2016-08-24
STATE GRID CORP OF CHINA +1
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Problems solved by technology

These newly developed special instruments are complex, expensive, and difficult to use; software technologies such as calculation models need to be improved, which affects the credibility of the results, so they have not been widely used in practice

Method used

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  • Moisture Content Measurement Method of Transformer Insulation System
  • Moisture Content Measurement Method of Transformer Insulation System
  • Moisture Content Measurement Method of Transformer Insulation System

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Experimental program
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Embodiment Construction

[0024] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments:

[0025] After the insulation system of the transformer to be tested is pressurized by DC for 1 second, the polarization that occurs in the medium is mainly "interface polarization", and other polarizations have been attenuated. The initial value measured by the insulation resistance test mainly characterizes the resistance of the oil layer insulation; the insulation resistance near the stable value mainly characterizes the insulation resistance of the paper layer; the intermediate process depends on the time constant of the oil layer and the paper layer in parallel (interface). Since the insulation resistance is mainly related to the water content of the oil-paper, the water content of the oil-paper insulation can be estimated by measuring the insulation resistance and time curve R(t). Based on this characteristic, the present invention...

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Abstract

The invention discloses a method for measuring the water content of transformer insulation parts, which includes establishing a geometric model of the transformer insulation system by using the insulation structure data of the transformer; and obtaining the resistivity and time of samples of the transformer insulation material to be tested under various water content and temperature conditions The relationship curve; input the relationship curve into the geometric model, and use the dynamic electric field finite element method to calculate the corresponding relationship curve R of transformer insulation resistance and time under various water content and temperature conditions C (t); Obtain the relationship curve R of the insulation resistance and time of the transformer to be tested by measuring with a traditional insulation resistance meter m (t); the relationship curve R C (t) and the relationship curve R m (t) compare, obtain and relation curve R m (t) A relationship curve R with the highest coincidence degree C (t), this relationship curve R C (t) The corresponding water content is the water content of the insulating parts of the transformer. The invention can respectively and accurately measure the water content of the insulation system of the transformer.

Description

technical field [0001] The invention relates to the technical field of the detection of the moisture content of oil-paper insulation such as transformers, in particular to a method for measuring the moisture content of a transformer insulation system. Background technique [0002] Oil-paper insulation equipment such as transformers in the power grid will accumulate moisture in the insulation due to the infiltration of moisture in long-term operation, or the aging and decomposition of oil and paper fibers, which will accelerate the insulation deterioration, damage the equipment insulation, and eventually cause a power outage accident in the power grid. Therefore, the detection of the insulation dampness (water content) of transformers and other equipment is a regular and important task to assess the health status of the equipment so that corresponding countermeasures can be taken to ensure the safe operation of the power grid. [0003] Traditionally, insulation resistance met...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/04
Inventor 涂明罗维王瑞珍文闿成丁友赵海涛罗浪
Owner STATE GRID CORP OF CHINA
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