Acoustic-electric detection device for insulation defects of power cable

Abstract

The invention relates to an acoustic-electric detection device for the insulation defects of a power cable, characterized by comprising a cable to be detected and a two-channel detection mechanism connected with the cable to be detected. The output end of the two-channel detection mechanism is connected with a receiving device and comprises an electromagnetic wave detecting head and an ultrasonicwave detecting head; the electromagnetic wave detecting head is connected with the cable to be detected; the surface of the ultrasonic wave detecting head is coated by silicone grease; the electromagnetic wave detecting head and the ultrasonic wave detecting head are electrically connected with respective signal acquisition processors and transfer cable insulation defect signals detected by the two-channel detection mechanism to the signal acquisition processors; and the signals processed by the signal acquisition processors are sent to a signal displaying and alarming system to detect and alarm the insulation defects of the cable. Partial defects in the cable are found and positioned as early as possible by the online monitoring or the routing inspection of the partial discharge of the cable. The invention finds the partial defects in the cable as early as possible, grasps the operation conditions of the cable in time and prevents major accidents from occurring.

Description

technical field [0001] The present invention relates to power cable detection technology, which uses acoustic-electric detection technology and acoustic-electric insulation defect or fault location technology to detect local defects in cables early by monitoring partial discharge of cables or performing inspections on partial discharge of cables. An acoustoelectric detection device for power cable insulation defects and positioning. Background technique [0002] Power cables are generally laid underground, and their operating environment is quite harsh. During the laying and installation of cables, various insulation hazards often occur, such as moisture, cracking of the cable metal shielding layer, internal damage of the cable body due to mechanical stress, and dirty core wires at the cable joints. Bubbles, cracks, acupuncture, and dirty core wires in the XLPE insulating medium will cause dielectric loss to increase and partial discharge under high voltage, resulting in gr...

AI Technical Summary

Problems solved by technology

The above-mentioned detector only adopts a single detection method, and the fault point ① cannot detect the cables such as moisture, cable metal shielding layer cracking, internal mechanical stress of the cable body, and dirty core wires at the cable joints; The signal has not been processed for anti-interference; ③In the original electrical detection method, PD generates high-frequency and low-amplitude disturbance signals. This detection method has poor anti-interference ability, low precision, and cannot locate

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