Laser-interference-based built-in high-voltage cable's partial power discharge two-dimension ultrasonic sensor

Abstract

The invention discloses a laser-interference-based built-in high-voltage cable's partial power discharge two-dimension ultrasonic sensor, which comprises a metal screw nut, a built-in screw thread ceramic insulation pipe, a sensing probe arranged inside the built-in screw thread ceramic insulation pipe and a 3dB optical fiber coupler in connection with the sensing probe. The 3dB optical fiber coupler is connected with a laser source, the sensing probe and two optoelectronic pipes respectively. The sensing probe comprises an outer steel barrel, an inner lining steel barrel, a ceramic core, a resonance oscillation quartz film and a ceramic core fixing component. A naked core suspension needle is inserted into the ceramic core and is connected therewith through glue. The reflected optical signal passes the 3dB optical fiber coupler, and then, one channel of the signal enters the first optoelectronic pipe through another Moire transmission grating, and the grating reflected part enters the second optoelectronic pipe. The sensor of the invention is low in cost, facilitates the positioning of the high-voltage cable's partial power discharge fault points and can conveniently realize the live detection for high-voltage cable's partial power discharge.

Description

technical field [0001] The invention discloses a built-in high-voltage cable partial discharge two-dimensional ultrasonic sensor based on laser interference, which is a live detection system that can be widely used in the measurement of high-voltage cables and transformer partial discharges. Background technique [0002] With the rapid development of high-speed railways, power cables have been used more and more in high-speed railway construction, and their safe and stable operation is of great importance. Partial discharge live detection of cables is an important method to know the operating status of cables. Current research shows that the detection of partial discharge is based on the phenomena of electricity, light, sound, and magnetism that accompany partial discharge, and the detection method of partial discharge acoustic wave is the most widely used. In PD testing, ultrasonic testing cannot avoid multi-directional electromagnetic interference, insufficient sensitivit...

AI Technical Summary

Problems solved by technology

[0015] The technical problem to be solved by the present invention is to provide a low-cost, simple installation process, and easy to locate the fault point based on laser interference-based two-dimensional ultrasonic sensor for partial discharge of high-voltage cables, so as to solve the problem of existing high-voltage cable partial discharge detection equipment. Expensive, complicated operation, low precision, difficult to locate the fault point, and greatly affected by the environment, etc.

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