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Method for measuring and judging insulation aging based on PEA space charges

A space charge, insulation aging technology, used in testing dielectric strength and other directions

Active Publication Date: 2014-02-05
FOSHAN POWER SUPPLY BUREAU GUANGDONG POWER GRID
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AI Technical Summary

Problems solved by technology

[0004] The present invention is aimed at the problem of the importance of insulation aging in electrical equipment, and proposes a method for judging insulation aging based on PEA space charge measurement, realizing on-line monitoring of the space charge inside the insulation of power cables, and monitoring the power cable according to the measured space charge data. Insulation for aging assessment

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  • Method for measuring and judging insulation aging based on PEA space charges
  • Method for measuring and judging insulation aging based on PEA space charges
  • Method for measuring and judging insulation aging based on PEA space charges

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Embodiment Construction

[0031] 1. PEA space charge measurement system with phase detection:

[0032] The measurement principle of the pulse electroacoustic method (PEA): a high-voltage electric pulse with a narrow pulse width is applied to the test electrode, and the space charge in the sample generates a corresponding pressure wave pulse under the action of the pulse, and the pressure of the pressure wave pulse The profile is related to the bulk density distribution of space charge in the sample, and the corresponding space charge distribution in the sample can be obtained by measuring the pressure wave pulse with the pressure sensor. Such as figure 1 The schematic diagram of space charge measurement by electroacoustic pulse method is shown. Its working principle: the high-voltage pulse source 1 and the high-voltage capacitor C are connected in series to the upper and lower aluminum electrodes 2-1 and 2-2 at both ends of the sample 4, and at the same time, the DC high-voltage power supply 8 is als...

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Abstract

The invention relates to a method for measuring and judging insulation aging based on PEA space charges. The method includes the steps that a pulsed electro-acoustic space charge measurement system is built, a space charge test is conducted on an insulating layer of a power cable, statistics is conducted on the absolute charge quantity of the space charges, the currently measured quantity and a threshold value are compared with historical data, and insulation is evaluated by utilizing the total quantity and the charge increased speed to analyze parameters; according to an externally applied high voltage power supply electric field and an insulation internal space charge distribution curve, an electric field intensity method is utilized to analyze insulation of the power cable, when calculated field intensity is higher than a design value, the insulation can be damaged, and the aging degree of insulation can be judged according to the increased speed of the electric field intensity. According to the method, the insulation internal space charges of the power cable are online monitored, and insulation aging of the power cable is evaluated according to data.

Description

technical field [0001] The invention relates to an insulation aging diagnosis technology, in particular to a method for judging insulation aging based on PEA space charge measurement. Background technique [0002] The main insulation of electrical equipment (such as XLPE cables, etc.) will age as the cable runs longer. Insulation aging may cause insulation breakdown accidents, bring a lot of inconvenience to production and people's life, and cause major economic losses. It can be seen from the statistical data that the cable breakdown accidents mainly occur in the cable body and accessories, and the body is the part where the cable equipment is prone to failure. In addition to the damage of the cable body by external force, the cause of the cable accident is that the insulation material and manufacturing process of the cable equipment (body and accessories) are poor, and the insulation performance is seriously aging under the influence of environmental factors such as elect...

Claims

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Application Information

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IPC IPC(8): G01R31/12
Inventor 朱文滔罗向源
Owner FOSHAN POWER SUPPLY BUREAU GUANGDONG POWER GRID
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