Auxiliary device and method for precise location of power cable faults

Abstract

The invention discloses a device and method for assisting accurate positioning. The device consists of a double-way piezoelectric sound wave sensing unit, a signal conditioning / difference unit and a display device. The piezoelectric sound wave sensing unit comprises an upper / lower self-round ring made from glass fiber solid-state silica gel sound-insulation composite material, wherein a piezoelectric sensitive element formed by bonding a thin meal sheet and a piezoelectric ceramic piece is installed in the upper self-round ring. The method for assisting positioning is adopted between a distance measurement given fault interval and fixed-point operation of an acoustomagnetic instrument and comprises the steps that double-way piezoelectric sound wave sensors are installed on a fault cable in the mode of spacing of 1 m, sound wave signals about cable fault point discharge are acquired, sound wave directions are qualitatively judged, and the fault interval is compressed; differential processing is conducted on fault point sound wave signals, and environmental noise and common-mode interference of electromagnetic force vibration noise of cables are overcome; the fixed-point operation amount is decreased by combining with a cable length balanced criterion partition fault interval based on a bisection method. The device and method is based on the prior art and equipment and is convenient to popularize.

Description

technical field [0001] The present invention belongs to the technical category of power cable fault location; in particular, based on the existing power cable ranging equipment, with the help of urban cable well facilities and precise positioning auxiliary devices, the amount of fixed-point work, that is, the work of precise positioning of the existing acoustic magnetic instrument is reduced. Auxiliary devices and methods. Background technique [0002] In 2014, my country's installed power generation capacity and power generation amounted to 1.36 billion kilowatts and 5,463.8 billion kilowatt-hours, respectively, achieving world-renowned achievements. Iconic industry innovations are also emerging one after another: 1 million kilowatt ultra-supercritical generator sets and 1 million volt UHV power transmission in the field of power generation and transmission, unattended substations in the field of power transformation, and popularization of power cables in the field of power...

AI Technical Summary

Problems solved by technology

The technical difficulty and workload of determining the fault point within the 300m interval are extremely high, requiring repeated listening and review, which is time-consuming and laborious; at present, well-trained operators can determine if and only when they step into the 0.5m area of ​​the fault point point of failure

[0012] The above-mentioned beneficial explorations have certain reference value, but there are still limitations in the exploration results

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