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Sensor used for high voltage electrical equipment partial discharge monitoring

A technology for partial discharge monitoring and high-voltage electrical equipment, applied in the field of high-frequency current sensors, it can solve the problems of low resonant frequency point, low sensor transmission impedance, insufficient bandwidth, etc., to expand the range, improve the measurement accuracy, and avoid measurement errors. Effect

Inactive Publication Date: 2018-05-08
CHONGQING ZHENYUAN ELECTRICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention solves the problems of low resonant frequency, insufficient bandwidth, and small transmission impedance of the currently commonly used high-frequency current sensor for charged detection in the prior art, and provides a high-frequency current sensor based on the Rogowski coil principle. The resonant frequency range of the high-frequency current sensor is stable, the bandwidth range is large, the transmission impedance is increased, the sensitivity is high, and the stability is good

Method used

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  • Sensor used for high voltage electrical equipment partial discharge monitoring
  • Sensor used for high voltage electrical equipment partial discharge monitoring
  • Sensor used for high voltage electrical equipment partial discharge monitoring

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0025] Such as Figure 1-3 As shown, the sensor used for partial discharge monitoring of high-voltage electrical equipment includes a BNC connector 6, a magnetic core 7, a coil winding 3, a matching resistor 5, and a matching capacitor 4. The magnetic core 7 is made of an ultrafine-crystalline alloy material, and the The magnetic core 7 includes a first magnetic core 1 and a second magnetic core 2, the first magnetic core 1 and the second magnetic core 2 are semicircular rings, and the first magnetic core 1 and the second magnetic core 2 are connected to form Ring, the coil winding 3 is made of copper wire with a diameter of 0.5 mm, the copper wire is wound with a pitch of 0.5 mm to wind the coil winding 3, the number of turns of the coil winding 3 is 5 turns, and the coil winding 3 is wound On the second magnetic core 2, one end of the coil winding 3 is connected to the input end of the BNC connector 6, the other end of the coil winding 3 is connected to one end of the matchi...

Embodiment 2

[0031] On the basis of Embodiment 1, a casing is also provided. The casing is made of metal material. The casing is composed of two metal semicircular rings with a hollow interior, and the two metal semicircular rings are connected by bolts. The purpose of building the magnetic core inside the shell is to shield the coil winding inside the shell to reduce the interference of the external magnetic field and suppress the stray magnetic field from entering the coil winding.

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Abstract

The invention discloses a sensor used for high voltage electrical equipment partial discharge monitoring. The sensor comprises a BNC joint, a magnetic core, a coil winding, a matching resistor and a matching capacitor. The magnetic core is made of an iron core material of ultracrystalline alloy. The magnetic core comprises a first magnetic core and a second magnetic core. The first magnetic core and the second magnetic core are semicircle rings. The first magnetic core and the second magnetic core are connected so as to form a circular ring. The coil winding winds the second magnetic core. Oneend of the coil winding is connected to an input end of the BNC joint. The other end of the coil winding is connected to one end of the matching resistor. The other end of the matching resistor is connected to the input end of the BNC joint. One end of the matching resistor is connected to one end of the matching capacitor. The other end of the matching capacitor is connected to the other end ofthe matching resistor. A purpose of stabilizing an output range of a resonance frequency of a high frequency current sensor is reached, a bandwidth range is enlarged, a transmission impedance of the high frequency current sensor is increased, and the sensor is good for increasing measurement accuracy of the high frequency current sensor.

Description

technical field [0001] The invention relates to a high-frequency current sensor, in particular to a sensor for partial discharge monitoring of high-voltage electrical equipment. Background technique [0002] According to statistics, the most frequent failure of high-voltage electrical equipment is insulation failure, and most of the insulation failures are accompanied by partial discharge. Therefore, partial discharge monitoring is very meaningful for mastering the operating status of high-voltage electrical equipment. [0003] With the generation of partial discharge, high-frequency current with a frequency up to Mhz often flows on the grounding wire of high-voltage equipment. Therefore, monitoring the high-frequency grounding current of high-voltage equipment is an effective means of monitoring partial discharge, and it is the most widely used in substations. The live detection method is widely used in the detection of GIS, main transformer, cable, and other equipment. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12
CPCG01R31/12G01R31/1227
Inventor 龚伟
Owner CHONGQING ZHENYUAN ELECTRICAL CO LTD