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Puncture test-used insulation cover suitable for cable cabin embedded condition

A technology of withstand voltage test and insulating cover, which is applied in the direction of testing dielectric strength, etc., can solve the problems of inability to correctly reflect the leakage current value of the cable body, the leakage current value of the withstand voltage test is too large, and the surface leakage current is large. Convenient and fast, high AC breakdown strength, low cost effect

Active Publication Date: 2015-09-23
SHANGHAI MUNICIPAL ELECTRIC POWER CO
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  • Summary
  • 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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  • Puncture test-used insulation cover suitable for cable cabin embedded condition
  • Puncture test-used insulation cover suitable for cable cabin embedded condition
  • Puncture test-used insulation cover suitable for cable cabin embedded condition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 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.

[0031] Table 1 High-voltage cable indoor 10KV cable terminal pile head size table

[0032]

[0033] This embodiment comprehensively considers 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. Insulation cover, the design diameter of the insulation cover should be slightly larger than the width of the largest pile head at the same voltage level, and the hollow diameter inside the insulation cover of a 10kV high-voltage cable should be at least 51mm to 55mm. The insulation thickness at the top of the insulation cover is at least 10mm~12mm, and the insulation thickness at the side is at least 8mm~10mm. This insulation thickness can meet the requirements of the s...

Embodiment 2

[0039] Compared with the first embodiment, the second embodiment is only different in the design size, and the cross section of the 35kV conventional cable is 400mm 2 and 630mm 2 Two types, see Table 3 for specific dimensions.

[0040] Table 3 High-voltage cable indoor 35KV cable terminal pile head size table

[0041]

[0042]This embodiment comprehensively considers that the cable terminal pile heads of various cross-sections can be used without damaging the silicone rubber insulation of the cable terminal itself. Insulation cover, the design diameter of the insulation cover should be slightly larger than the width of the largest pile head at the same voltage level, and the hollow diameter inside the insulation cover of a 35kV high-voltage cable should be at least 65mm to 70mm. The insulation thickness at the top of the insulation cover is at least 12mm~14mm, and the insulation thickness at the side is at least 10mm~12mm. This insulation thickness can meet the requiremen...

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Abstract

The invention relates to a puncture test-used insulation cover suitable for a cable cabin embedded condition. The insulation cover comprises three individual-phase insulation covers; each phase of a three-phase cable is correspondingly provided with one individual-phase insulation cover; the individual-phase insulation covers are of cylinder-shaped structures; the external sides of the individual-phase insulation covers are provided with umbrella skirt structures used for increasing creepage distances; the individual-phase insulation covers directly sleeve high-voltage cable terminal pile heads so as to be used for shading the cable terminal pile heads and isolating the cable terminal pile heads from ground potential at the tops of the insulation covers when a puncture test is performed on a high-voltage cable line; a high-voltage lead for the puncture test is led into the inner side of each individual-phase insulation cover; and the individual-phase insulation covers sleeve corresponding cable terminal pile heads, and then the puncture test is performed. With the insulation cover adopted, the problems of damage to a cable body and generation of a pungent gas when a traditional method used for avoiding the insufficiency of the distance between indoor cable terminal pile heads and surrounding ground potential in a cable line puncture test in a novel transformer and distribution power station cabin is adopted, can be solved.

Description

technical field [0001] The invention relates to a power cable circuit, in particular to a withstand voltage test of a high-voltage cable, and in particular to an insulating cover suitable for a withstand voltage test embedded in a cable compartment. 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 an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12
Inventor 刘圣奇周平李乐袁思远朱玮顾金
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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