Underground cable fault detection system and fault detection method thereof

Abstract

The invention provides an underground cable fault detection system and fault detection method thereof. The underground cable fault detection system comprises a cable fault ranging device, a cable pathdetection device, and a fault point detection device. The cable fault ranging device consists of a low-voltage pulse signal source, a high-voltage pulse signal source, and a high-speed receiving device to realize signal detection in a low-voltage pulse reflection method and a flashover method. The cable path detection device includes an alternating-current high-voltage signal source and an electromagnetic induction receiving device; the frequency and amplitude of the alternating-current high-voltage signal source are adjustable; the alternating-current high-voltage signal source excites a to-be-detected cable to generate an electromagnetic field; and the electromagnetic induction receiving device detects the electromagnetic field generated by the to-be-detected cable. The fault point detection device includes a high-voltage pulse signal source, a direct-current signal source, an alternating-current signal source, a step-voltage receiving device, an electromagnetic induction receivingdevice, and an acousto-magnetic synchronous receiving device. The underground cable fault detection system can be applied to detection of underground cable open-circuit, short-circuit, grounding, low-resistance, high-resistance flashover and high-resistance leakage faults to obtain an accurate fault point.

Description

Technical field [0001] The invention relates to an underground cable fault detection system and a fault detection method thereof, belonging to the field of cable detection. Background technique [0002] As an important component of power transmission and distribution in the power system, power cables are widely used in urban power grids, internal power supply lines of industrial and mining enterprises, and underwater transmission lines that cross rivers and seas. However, compared with overhead open wires, the daily maintenance of deeply buried cables is more difficult. During the long-term operation of underground power cables, failures are inevitable. The lack of corresponding equipment to detect fault points and delays in rush repairs to restore power transmission time will not only cause power loss to power companies, but also bring significant economic benefits to residents and factories and mines. Loss and social impact. Therefore, how to quickly and accurately find the l...

AI Technical Summary

Problems solved by technology

However, compared with overhead open wires, the daily maintenance of deep buried cables is more difficult

During the long-term operation of underground power cables, failures are inevitable. The lack of corresponding equipment to detect fault points and delay the repair and restoration of power transmission time will not only cause power loss to power companies, but also bring significant economic benefits to residents and factories and mines. loss and social impact

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