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Insulation cover for high-voltage cable line puncture tests and test method

A technology of withstand voltage test and high-voltage cable, applied in the direction of measuring electricity, measuring electrical variables, testing dielectric strength, etc., can solve the problem that the leakage current value of the cable body cannot be correctly reflected, the leakage current value of the withstand voltage test is too large, and the surface leakage current Large and other problems, to achieve the effect of safe and reliable withstand voltage test, high AC breakdown strength and low cost

Active Publication Date: 2015-09-23
SHANGHAI MUNICIPAL ELECTRIC POWER CO
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Due to the dirt on the surface of the insulation blanket and the insulation structure, the surface leakage current is relatively large, which may easily cause the leakage current value of the withstand voltage test to be too large, which cannot correctly reflect the leakage current value of the cable body, and when the withstand voltage test value is high, produce pungent gas

Method used

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  • Insulation cover for high-voltage cable line puncture tests and test method
  • Insulation cover for high-voltage cable line puncture tests and test method
  • Insulation cover for high-voltage cable line puncture tests and test method

Examples

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Embodiment 1

[0038] This embodiment one is aimed at the 10kV conventional cable of the high-voltage cable line, and its cross-section is 70mm 2 , 120mm 2 ,240mm 2 ,400mm 2 Four types, see Table 1 for specific dimensions.

[0039] Table 1 High-voltage cable indoor 10KV cable terminal pile head size table

[0040]

[0041] In this embodiment, comprehensively considering that the pile heads of cable terminals with various cross-sections can be used without damaging the silicone rubber insulation of the cable terminal itself, the internal hollow length of the sleeve part of the insulation cover of the 10kV high-voltage cable is at least 140 mm to 145 mm, in order to make the cable terminal pile The head can be installed with an insulating cover. The design diameter of the insulating cover should be slightly larger than the width of the largest pile head at the same voltage level. The internal hollow diameter of the insulating cover socket part of the 10kV high-voltage cable is at least 51m...

Embodiment 2

[0050] Compared with the first embodiment, the second embodiment is only different in the design size, the 35kV conventional cable cross section is 400mm 2 and 630mm 2 Two types, see Table 3 for specific dimensions.

[0051] Table 3 High-voltage cable indoor 35KV cable terminal pile head size table

[0052]

[0053] In this embodiment, comprehensively considering that the pile heads of cable terminals with various cross-sections can be used without damaging the silicone rubber insulation of the cable terminal itself, the internal hollow length of the sleeve part of the insulation cover of the 35kV high-voltage cable is at least 190 mm to 195 mm, in order to make the cable terminal pile The head can be installed with an insulating cover. The design diameter of the insulating cover should be slightly larger than the width of the largest pile head at the same voltage level. The internal hollow diameter of the insulating cover socket part of the 35kV high-voltage cable is at l...

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Abstract

The invention relates to an insulation cover for high-voltage cable line puncture tests and a test method. The insulation cover is installed at a high-voltage cable terminal pile head of a cable cabin and is used for isolating the cable terminal pile head from surrounding ground potential when a puncture test is performed on a high-voltage cable line. The insulation cover is L-shaped and is composed of a sleeve connection part and a lead-out part, wherein the sleeve connection part and the lead-out part are both of a cylindrical structure; a metal electric conduction body is arranged in the L-shaped insulation cover; the sleeve connection part directly sleeves the high-voltage cable terminal pile head; and the lead-out part is used for leading the cable terminal pile head from the interior of the insulation cover to the external side of the cable cabin. With the insulation cover adopted, the cable terminal pile head can be effectively isolated from the surrounding ground potential, the problems of damage to a cable body and generation of a pungent gas when a traditional method is adopted and the distance between an indoor cable terminal pile head and surrounding ground potential is insufficient can be solved.

Description

technical field [0001] The invention relates to a power cable circuit, in particular to a high-voltage cable withstand voltage test, and in particular to an insulating cover and a test method for a high-voltage cable circuit withstand voltage test. Background technique [0002] Power cable lines are one of the main elements for the transmission and distribution of electrical energy in the grid. Power cable lines are widely used in substations, switch stations, central stations and other places with dense power lines, playing an important role that overhead lines cannot replace. State Grid Shanghai Jiading Power Supply Company is in charge of the operation and maintenance management business of 35kV and 10kV cable lines (hereinafter referred to as "high voltage cable lines") in Jiading District, Shanghai. [0003] The withstand voltage test of cable lines is the most routine work in new cable line projects, power outage maintenance, and emergency repairs. The substations and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12G01R1/02
Inventor 顾金周平朱玮李乐刘圣奇袁思远
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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