A cable insulation dielectric spectrum and partial discharge defect detection method and device

Abstract

The invention provides a cable insulation dielectric spectrum and partial discharge defect detection method and device. Apply a periodic exponential waveform voltage to the detected cable; calculate the dielectric loss tangent curve of the detected insulated cable through the frequency-domain phase relationship between the waveform voltage and current on the rising edge of the exponential wave, and pass the waveform voltage on the falling edge of the exponential wave. Encouraging the partial discharge signal of the detected insulated cable; collecting and recording the partial discharge signal, and analyzing the partial discharge characteristic parameters of the partial discharge defect. The equipment is smaller and lighter; the excitation source equipment is small; there is no charge accumulation effect; the damage to the cable is smaller; the excitation voltage level is adjustable; it can be used to detect the dielectric spectrum of the high-voltage distribution cable; it can directly collect the part of the test object Discharge information for partial discharge location and pattern recognition.

Description

technical field [0001] The invention relates to a detection method and device for insulating dielectric spectrum and partial discharge defects of electric equipment, in particular to a detection method and detection device for electric cable insulation dielectric spectrum and partial discharge defects. Background technique [0002] In recent years, in order to improve the urban environment and ensure the safe and reliable operation of the power grid, distribution cables are gradually replacing traditional overhead lines and are more and more widely used in the construction of distribution networks. However, with the technological progress of my country's cable manufacturing industry in recent years and the large number of underground power cables used in urban transmission and distribution networks, the phenomenon of cable line operation failures due to defects in the insulation of the power cable body, defects in the construction and installation of cables and accessories, a...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a cable insulation dielectric spectrum and partial discharge defect detection method and detection device with a simple control structure, which can test the dielectric loss at multiple frequencies but cannot obtain the dielectric spectrum function, and has less damage to the cable

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