Active excitation-type multiple-frequency induction current cable identification method and device

Abstract

The invention provides a cable identification method and a device based on an active excitation-type multiple-frequency induction current. The method comprises the following steps of taking a loop formed by a cable armor layer, a grounding wire and ground as a secondary coil; through an excitation source, generating a coded alternating current signal to drive a primary coil; then, generating an induction voltage of a specific curve in the secondary coil, and inducing and generating a coded loop current with a corresponding characteristic in a loop formed by a high voltage cable armor, two-endgrounding wire and the ground; simultaneously, through a high precision current transformer, collecting an induction loop current, acquiring a cable grounding impedance and realizing state and characteristic monitoring of the cable. In the invention, through autonomous communication of a coded induction current generated through active excitation on high voltage and extra-high voltage cables, sitemulti-point networking is completed and then whole line identification and tracking of the cable are realized.

Description

technical field [0001] The invention relates to the field of electric power, in particular to an active excitation multi-frequency induction current cable identification method and device. Background technique [0002] Wire and cable are wire products used to transmit electric (magnetic) energy, information and realize electromagnetic energy conversion. Wires and cables in a broad sense are also referred to as cables for short. Cables in a narrow sense refer to insulated cables. Among them, 1KV and below are low-voltage cables; 1KV-10KV are medium-voltage cables; 10KV-35KV are high-voltage cables; 35-220KV are UHV cables; UHV cables are generally used as the central link belt in large-scale power transmission systems. They are high-voltage cables with high technical content and are mainly used for long-distance power transmission. Power cables between 35KV (1KV=1000V) are mostly used in main roads for power transmission. The components of high-voltage cables from the insid...

AI Technical Summary

Problems solved by technology

After long-term operation, the resistance value of individual nodes will increase due to factors such as installation method or installation process, which seriously affects the safe operation of the cable.

[0003] In cable engineering, how to quickly and accurately identify the target cable is very important. The current identification method requires the target cable to be in a power-off state before the cable identification. The disadvantage of this is that it not only greatly reduces the efficiency of cable identification, but also requires Touching the metal part of the cable, the operation is complicated, the safety is low, and it brings economic losses

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