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Composite current sensor for XLPE power cable in switch cabinet

A composite current and power cable technology, applied in the direction of only measuring current, measuring current/voltage, instruments, etc., can solve the problem of unreserved installation position of high-frequency current sensor, avoid power outages and major accidents, easy installation, monitoring responsive effect

Inactive Publication Date: 2016-12-07
STATE GRID TIANJIN ELECTRIC POWER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the application in the switchgear is still in the research stage, and the structure of the switchgear is compact, and the switchgear that has been in operation does not reserve the installation position of the high-frequency current sensor

Method used

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  • Composite current sensor for XLPE power cable in switch cabinet
  • Composite current sensor for XLPE power cable in switch cabinet

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Embodiment Construction

[0021] The present invention will be further described in detail below in conjunction with the accompanying drawings and through specific embodiments. The following embodiments are only descriptive, not restrictive, and cannot limit the protection scope of the present invention.

[0022] In this composite current sensor, the ferrite core 1 is used as the core of the composite current sensor. On the core, a high-frequency current transformer coil 3 with a small number of turns and a thick wire diameter is wound first. After the coil is wound, The coil is led out with a coaxial cable 4, and a zero-sequence current transformer coil 2 with a large number of turns and a thin wire diameter is wound outside the coil. After winding, it is led out with an ordinary wire 5. Finally, pour the composite current transformer with epoxy resin. Protect the coil inside the transformer. The lead-out line of the zero-sequence current transformer is the secondary line of the zero-sequence current...

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Abstract

The invention relates to a composite current sensor for an XLPE power cable in a switch cabinet. The composite current sensor centers on integration of a zero sequence current transformer and a high-frequency current transformer, and main parts include an annular magnetic line-frequency induction coil, a radio-frequency induction coil, a housing secondary terminal and the like. The radio-frequency induction coil and the line-frequency induction coil use ferrites as magnetic cores. The two coils are respectively wound around the magnetic cores and meanwhile are packaged by epoxy resin, the two coils are different in center frequency and bandwidth and does not affect each other during normal working.

Description

technical field [0001] The patent of the invention belongs to the live monitoring field of power transformation equipment, and relates to a power cable, especially an online monitoring method for partial discharge of an XLPE power cable in a power switch cabinet. Background technique [0002] With the gradual increase of the running time of some cross-linked polyethylene (XLPE) power cables; the electrical accidents caused by cable accessories and cable body insulation failures are also increasing, especially the accidents of cable accessories. [0003] Monitoring the partial discharge in the XLPE cable can reflect the insulation state of the cable very well. Experts and scholars at home and abroad and international power authorities agree that the partial discharge test is the best method for evaluating the insulation state of the XLPE power cable. However, domestic cable partial discharge on-line monitoring technology started more than ten years ago. How to diagnose the in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12G01R19/00
CPCG01R31/1272G01R19/0092
Inventor 辛晓虎王建慧吴胜志贾建华王兴国肖建超李赢
Owner STATE GRID TIANJIN ELECTRIC POWER
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