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Cable main insulator water tree phenomena initiation point test method

A technology of main insulator and testing method, which is applied in the direction of testing dielectric strength, fault location, etc., can solve the problems of low instrument penetration rate, not suitable for general users, expensive testing costs, etc., and achieve the effect of saving time

Inactive Publication Date: 2008-05-28
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The measurement accuracy of this method is relatively high, and the data reliability is strong, but the penetration rate of the instruments required for the test is very low, and the test cost is expensive, so it is not suitable for general users

Method used

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  • Cable main insulator water tree phenomena initiation point test method
  • Cable main insulator water tree phenomena initiation point test method
  • Cable main insulator water tree phenomena initiation point test method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1) Press 11g of the cable semi-conductive shielding material produced by Nordic Company and Suzhou Shuanghu Company respectively into a square sample with a thickness of 1mm and 100mm*100mm, and cut it into a circular sample with a diameter of 90mm. Put them into two devices shown in Fig. 1 respectively. In Fig. 1, 1 is a conductivity meter, 2 is a sealed container, 3 is ultrapure water, and 4 is a sample. Put the device into the constant temperature aging box, set the constant temperature aging box to 90°C, open the internal air circulation to ensure that the temperature in the constant temperature aging box is consistent. From the time it is placed in the constant temperature aging box, the conductivity of the solution is measured every other day (24 hours), and a data point is obtained.

[0034] After 30 days, we get two sets of data:

[0035] time

/ sky

Solution Conductivity (Nordic)

/ us*cm -1

Solution conductivity (Suzhou Shuanghu) ...

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Abstract

The invention discloses a method for testing cable main insulator water tree phenomenon initial points. The invention comprises starting from an angel of a condition that conductible ions are precipitated in a cable semi conductive shielding layer, imitating practical working hot and humid environment of the cable semi conductive shielding layer, characterizing the cable main insulator water tree phenomenon initial points. After sample hot water is cooked, a mathematical model is established, the mathematical model analyzed, a density distribution of the conductible ions which are in a t time sample is obtained, a precipitating condition of the conductible ions in the cable semi conductive shielding layer can be described well, which is used to analyze effects of the cable semi conductive shielding layer to the water tree phenomenon initial points which is produced through a cable main insulating layer. The testing method has the advantages that the requirement for needing equipment is low, tests can be advanced under normal lab conditions, and testing cost can be lowered by 10%. After data base is built successfully, the invention can be moved out immediately if the invention is needed without testing surface smoothness, which saves testing time.

Description

Technical field: [0001] The invention relates to a method for testing cable insulation properties, in particular to a method for testing the starting point of the water tree phenomenon of a cable main insulator. Background technique: [0002] There are many reasons for cable failure. Among them, the "water tree" phenomenon in the main insulator part is a very important factor causing cable failure. The "water tree" phenomenon in the cable main insulator requires three conditions: starting point, moisture, and strong electric field. [0003] The starting point of the water tree phenomenon in the cable main insulator is generally believed to be caused by the concavo-convex phenomenon on the contact surface between the cable semi-conductive shielding layer and the main insulator and the inclusion of foreign impurities during the production process. Both of these aspects have been given extensive attention during the production process. Although there is no relevant patent, s...

Claims

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Application Information

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IPC IPC(8): G01R31/12G01R31/08
Inventor 倪勇江平开韦平汪根林
Owner SHANGHAI JIAO TONG UNIV
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