Power frequency withstand voltage and partial discharge test terminal structure of medium-low voltage crosslinked cable

A terminal structure and cable work technology, applied in the direction of measuring electricity, measuring electrical variables, and testing dielectric strength, etc., can solve the problems of unsuitable, enlarged, and increased terminal installation difficulty of the test terminal, and achieve the improvement of partial discharge level and installation. Convenience and the effect of improving installation performance

Active Publication Date: 2009-12-23
江苏亨通叁原电工科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For partial discharge tests where the enterprise standard is higher than the national standard, the structural size of the rubber prefabricated stress cone used for the test must be specially designed and the structural size must be increased, but this increases the difficulty of terminal installation
[0003] Today's corporate standards for cable manufacturers are higher

Method used

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  • Power frequency withstand voltage and partial discharge test terminal structure of medium-low voltage crosslinked cable
  • Power frequency withstand voltage and partial discharge test terminal structure of medium-low voltage crosslinked cable

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0011] Example 1:

[0012] According to the attached figure 1 The insulation shields at both ends of the cable 9 are stripped to a certain length, and the cable insulation shields 2 at both ends of the cable 9 are sheathed with a metal stress cone 5, and then sheathed in a plexiglass sleeve 6 containing a fluorocarbon compound 7. The insulating medium is made of non-combustible fluorocarbon compound, which has very good insulating properties, with a boiling point of 50-60℃, safe, reliable, economical and efficient, and environmentally friendly. As long as the cable insulation and metal stress cones are all immersed in the liquid, the cable can be localized. Release and power frequency withstand voltage test.

Example Embodiment

[0013] Example 2:

[0014] The insulating medium is sulfur hexafluoride 14, and the outer side of the metal cover 1 at the left end of the plexiglass sleeve 6 is additionally provided with a tapered sealing ring 12, a cover plate 11 and a hexagonal head bolt 10. The tapered sealing ring enhances the gap between the metal cover and the outer diameter of the cable Sealing solves the short-time sealing problem at the left end, and can perform partial discharge and power frequency withstand voltage tests of the cable.

[0015] The present invention replaces the rubber prefabricated stress cone with a metal stress cone 5. The inner diameter of the metal stress cone is larger than the outer diameter of the cable insulation shield, and is fixed on the cable insulation shield 2. The cable insulation shield can be processed by the installation process of the Freon test terminal, and the installation convenience is improved. carry on.

[0016] According to the withstand voltage level and pa...

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Abstract

The invention relates to a power frequency withstand voltage and partial discharge test terminal structure of a medium-low voltage crosslinked cable. The test terminal structure comprises cable insulation after the insulating shield of the two ends of a cable terminal is stripped by a certain length, an insulating sleeve and insulating medium. The terminal structure is characterized by also comprising metal stress cones which are sleeved at fractures of insulating shielding layers of the cable; the end parts of the cable are axially abutted with high-voltage applying ends; the insulating sleeve is arranged outside the metal stress cones and the high-voltage applying ends; two ends of the insulating sleeve are provided with metal covers covering the two ends of the insulating sleeve; gaps among the cable insulation, the metal stress cones and the high-voltage applying ends in an insulating sleeve cavity are filled with insulating mediums which is one of fluorocarbon, sulfur hexafluoride, nitrogen or a mixed gas containing sulfur hexafluoride and nitrogen. The test terminal structure is fast and simple, replaces a Freon terminal and a rubber prefabricated stress cones, and simultaneously improves the installation performance and the partial discharge of the test terminal.

Description

technical field [0001] The invention relates to a terminal structure for partial discharge and power frequency withstand voltage tests of medium and low voltage cross-linked cables, and is suitable for how to carry out partial discharge and withstand voltage tests for 10kV and 35kV cross-linked cables. Background technique [0002] According to the requirements of relevant national standards, medium and low voltage cables should be subjected to partial discharge and power frequency withstand voltage tests, at 1.73U 0 Under the measurement of partial discharge, and to carry out 3.5U 0 5 minutes power frequency withstand voltage test. At present, the standards of some domestic cable manufacturers are higher than the national standards, that is, at 3.5U 0 The power frequency withstand voltage test and partial discharge test are carried out at the same time under the voltage, which puts forward higher requirements for the design of the test terminal. There are usually two m...

Claims

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Application Information

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IPC IPC(8): G01R1/02G01R31/12G01R31/08
Inventor 张荣徐操瞿金山冯岗杨文妃邵斌王福生
Owner 江苏亨通叁原电工科技有限公司
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