Power cable partial discharge positioning system based on solenoid high-voltage wire and detection method

Abstract

The invention discloses a power cable partial discharge positioning system based on a solenoid high-voltage wire and a detection method thereof. The system comprises a damping oscillation wave deviceand the solenoid high-voltage wire, wherein a high-voltage source output end of the damping oscillation wave device is connected with the solenoid high-voltage wire, and the other end of the solenoidhigh-voltage wire is connected with the near end of a to-be-tested cable, wherein quick connectors are adopted during connection. A blind area positioning detection process comprises the following steps of when an oscillation wave test of a distribution network cable is carried out, inserting a section of solenoid high-voltage wire without local discharge between an oscillation wave host machine and the to-be-detected cable as an auxiliary positioning device, identifying a direct pulse and a reflected pulse, and judging discharge positions according to the waveform characteristics. The deviceand the method can be matched with different types of distribution network cable damping oscillation wave equipment of different manufacturers under the condition that accessories and field workload are increased at the minimum limit, and partial discharge sources positioned at a near-end terminal and a far-end terminal can be quickly and accurately distinguished.

Description

Technical field [0001] The invention relates to a detection system for power cable oscillation wave test and a method for testing partial discharge, in particular to a power cable terminal partial discharge positioning system and detection method based on a spiral tube high-voltage line. Background technique [0002] Damped oscillating wave detection technology is a new technology used for power cable field condition detection and diagnosis that has been paid close attention in recent years at home and abroad. It has good equivalence with power frequency voltage, short action time, non-destructive testing, and easy to carry. Advantages. With the development of power systems and the increasing requirements of users for power supply reliability, damped oscillatory wave technology has been widely used in the field of state detection of power cables, especially power cables in distribution networks. There are corresponding power industry standards for the application of damped oscill...

AI Technical Summary

Problems solved by technology

The actual field application shows that the damped oscillatory wave equipment applied to the distribution network power cable test can effectively detect and locate the partial discharge of the tested distribution network power cable body and the intermediate joint; The oscillatory wave equipment adopts the traveling wave positioning method for partial discharge positioning, and the traveling wave waveforms of the cable test end terminal and the remote terminal are consistent, so the existing single-ended sampling damped oscillatory wave equipment is very accurate for the partial discharge at the power cable terminal of the distribution network. There is a positioning blind area, and the partial discharge can only be detected at the terminal, but it cannot be effectively distinguished and located whether the partial discharge is located at the near-end (test end) terminal or the far-end terminal

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