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High-voltage short-cable insulation terminal partial discharge testing device and using method

A technology of partial discharge and cable insulation, applied in the direction of testing dielectric strength, etc., to achieve the effect of live detection and rapid testing process

Active Publication Date: 2013-09-25
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the cable terminal on the grounding side of the sheath protector of the high-voltage short cable line, since there is no current flowing in the grounding wire, there is currently no method for partial discharge detection

Method used

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  • High-voltage short-cable insulation terminal partial discharge testing device and using method

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Embodiment Construction

[0020] Below in conjunction with the examples, the present invention is further described, the following examples are illustrative, not limiting, and the protection scope of the present invention cannot be limited by the following examples.

[0021] A high-voltage short cable insulation terminal partial discharge test device, such as figure 1 As shown, it includes three high-voltage short cables 1, insulating terminal 2 and sheath protector 5, one end of each high-voltage short cable is directly grounded, and the other end of each high-voltage short cable is protected by cable 3, connection point 4 and sheath The innovation of the present invention is that the upper end of each sheath protector is connected to one end of a cable 6, a power resistor 7 is connected in series in the middle of the cable, and the other end of the cable is connected to each sheath protector The grounding terminal 11 and the direct grounding point 11 at one end of each cable, a high-frequency current...

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Abstract

The invention relates to a high-voltage short-cable insulation terminal partial discharge testing device. One end of each cable is connected to the upper end of each protective layer protector. A power resistor is connected to the middle portion of each cable in series. The other end of each cable is connected with a grounding end of each protective layer protector and a direct grounding point of one end of each electric cable. A high-frequency current sensor is sleeved at intervals on the cable between the grounding end of each protective layer protector and each power resistor. An output end of the high-frequency current sensor is connected with partial discharge measuring equipment. The upper ends of the protective layer protectors of an insulation terminal and the grounding points are connected through the cables, output of the high-frequency current sensor is collected to complete partial discharge live detection of the insulation terminal, under the premise that normal operation of a circuit is guaranteed, live detection in which the protective layer protector is connected to the ground to detect electric cable terminal partial discharge is achieved, a testing process is quick, and convenience is achieved.

Description

technical field [0001] The invention belongs to the field of partial discharge testing devices for high-voltage short cable insulation terminals, in particular to a partial discharge testing device for high-voltage short cable insulation terminals and a use method. Background technique [0002] The power industry standard DL / T5221-2005 "Technical Regulations on Design of Urban Power Cable Lines" and the State Grid Corporation of China Enterprise Standard Q / GDW512-2010 "Operation Rules for Power Cable Lines" stipulate that the metal sheath or shielding layer of AC single-core cables shall be in-line At least one point on the road is directly grounded. When no safety measures are taken to prevent personnel from touching the metal sheath or shielding layer at will, under normal full load conditions, the normal induced voltage at any point on the metal sheath or shielding layer that is not grounded shall not exceed 50V. [0003] 110kV and above voltage level high-voltage short ...

Claims

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Application Information

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IPC IPC(8): G01R31/12
Inventor 周凤争张东斐朱晓辉唐庆华齐效华孟峥峥郭勇王浩鸣李旭
Owner STATE GRID CORP OF CHINA
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