UHF (Ultra High Frequency) broadband current sensor based on Rogowski coil principle and joint monitoring system

A technology of current sensor and Rogowski coil, which is applied in the direction of testing dielectric strength, etc., can solve the problem that UHF broadband current sensor cannot be used for partial discharge detection of cable intermediate joints.
CN103529366AActive Publication Date: 2014-01-22NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
Publication Date
2014-01-22

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Abstract

The invention discloses a UHF (Ultra High Frequency) broadband current sensor based on a Rogowski coil principle and a joint monitoring system, and belongs to the technical field of local discharge monitoring of cables. The magnetic core of the UHF broadband current sensor is partitioned into two half rings, and is made of an iron-based nanocrystalline alloy material; a winding is a copper lead which is 0.8 millimeter in diameter; a coil is of 15 turns. The joint monitoring system consists of the UHF broadband current sensor and a VHF (Very High Frequency) sensor, wherein the VHF sensor and the UHF broadband current sensor are used together for monitoring a running cable in real time; data are transmitted to an oscilloscope; the oscilloscope is connected with an industrial control computer. According to the UHF broadband current sensor, a local discharge signal can be calibrated, so that background noise interference can be eliminated effectively, and a local discharge waveform is extracted accurately. A detection test is performed on a middle joint of a real cable with local discharge in an experiment and on field, and a test result indicates that the sensitivity is below 10pV; interference signals can be reduced effectively; a basis is provided for the judgment of field personnel.
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Description

technical field

[0001] The invention relates to a UHF broadband current sensor based on the Rogowski coil principle (Rogowski coil principle) and a joint monitoring system. It is a UHF broadband current sensor based on the Rogowski coil principle and uses the UHF broadband The invention relates to a cable partial discharge monitoring system for combined detection by a current sensor and a VHF sensor, belonging to the technical field of cable partial discharge monitoring. Background technique

[0002] The relatively mature method of on-line detection of cable partial discharge is the VHF detection method, and the detection frequency band of this type of detection method is concentrated in the VHF frequency band (1 ~ 300MHz). In this method, the partial discharge signal attenuates slowly, and the calibration of the average apparent discharge of partial discharge can be realized. However, due to the weak and small amplitude of the partial discharge signal of the XLPE cable, th...

Claims

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