CN203502545U

CN203502545U - Cable fault detector

Info

Publication number: CN203502545U
Application number: CN201320661270.8U
Authority: CN
Inventors: 黄望军; 陈冬南; 张泽剑; 汪广; 曹杰; 杨亚超
Original assignee: Hunan Institute of Engineering
Current assignee: Hunan Institute of Engineering
Priority date: 2013-10-25
Filing date: 2013-10-25
Publication date: 2014-03-26
Anticipated expiration: 2023-10-25

Abstract

The utility model discloses a cable fault detector, which comprises a signal acquisition module, a signal conditioning module, a rectifying module, a voltage comparator, a data logic circuit, a single chip microcomputer, a display screen and a keyboard, wherein the signal acquisition module comprises an acoustic vibration sensor and an electromagnetic wave sensor; the signal acquisition module, the signal conditioning module, the rectifying module, the voltage comparator, the data logic circuit and the single chip microcomputer are connected in sequence; the signal acquisition module sends acoustic wave signals and electromagnetic wave signals acquired from a cable to the signal conditioning circuit for amplification, filtering and shaping processing; the processed signals are sent to the single chip microcomputer for processing after passing through the rectifying module, the voltage comparator and the data logic circuit; and the display screen and the keyboard are respectively connected with the single chip microcomputer. The cable fault detector adopts an acoustic-magnetic combined pointing technology, is combined with a power cable traveling wave distance measuring technology, can accurately measure the cable fault point, and has the advantages of simple structure, low cost and long measuring distance.

Description

Cable fault detection instrument

Technical field

The utility model relates to power cable field, particularly a kind of cable fault detection instrument.

Background technology

China's science and technology advances steadily in recent years, and electric energy technology is advanced by leaps and bounds especially, and in order to adapt to the needs of carrying and distributing high-power power, power cable line arises at the historic moment.At present, China's overhead transmission line and power cable line are all being undertaken the significant task of electric energy transmitting, power cable line is compared with overhead transmission line, have to lay and take ground and space is few, power transmission reliability, security are higher, and transmission losses is little, the advantages such as operation is simple, convenient, so China, in area, down town, densely populated area etc., all adopts power cable line in a large number, and does not adopt overhead transmission line as far as possible.

Yet, along with being on the increase and the prolongation of working time of cable line quantity, also brought many new problems, such as: the operation maintenance of power cable line and fault finding etc.Due to the disguised feature of cable line, the accident once power cable line breaks down, needs special equipment and personnel to carry out localization of fault, and time and cost all increase greatly.If can find out fast, accurately the particular location of line fault, just can save the breakdown maintenance time, reduce the economic loss that has a power failure and cause because of cable line fault.

Summary of the invention

In order to solve the problems of the technologies described above, the utility model provides a kind of simple in structure, cost is low, working stability is reliable and accuracy of detection is high cable fault detection instrument.

The technical scheme that the utility model addresses the above problem is: a kind of cable fault detection instrument, comprise signal acquisition module, signal condition module, voltage comparator, mathematical logic circuit, single-chip microcomputer, described signal acquisition module, signal condition module, voltage comparator, mathematical logic circuit, single-chip microcomputer are connected successively, signal acquisition module by the sound wave collecting from cable, electromagnetic wave signal send into that signal conditioning circuit amplifies, filtering, Shape correction, the signal after processing is sent into single-chip microcomputer and is processed through voltage comparator, mathematical logic circuit.

Described cable fault detection instrument also comprises rectification module, and described rectification module is placed between signal condition module and voltage comparator.

Described cable fault detection instrument also comprises display screen and keyboard, and described display screen is connected with single-chip microcomputer respectively with keyboard.

Described in described cable fault detection instrument, signal acquisition module comprises acoustic vibration sensor and electromagnetic sensor.

The beneficial effects of the utility model are: the utility model utilization sound magnetic is combined fixed point technology, in conjunction with power cable travelling wave ranging technology, can measure exactly the trouble spot of cable, and have advantages of simple in structure, cost is low, measuring distance is long.

Accompanying drawing explanation

Fig. 1 is structured flowchart of the present utility model.

Fig. 2 is acoustic vibration Fundamentals of Sensors schematic diagram of the present utility model.

Embodiment

Below in conjunction with drawings and Examples, the utility model is further described.

As shown in Figure 1, the utility model comprises signal acquisition module, signal condition module, rectification module, voltage comparator, mathematical logic circuit, single-chip microcomputer, display screen and keyboard, described signal acquisition module, signal condition module, rectification module, voltage comparator, mathematical logic circuit, single-chip microcomputer is connected successively, described display screen is connected with single-chip microcomputer respectively with keyboard, described signal acquisition module comprises acoustic vibration sensor and electromagnetic sensor, described acoustic vibration sensor is sent the acoustic signals collecting from cable into signal conditioning circuit, electromagnetic sensor by get the disruptive discharge of cable line fault point time the electromagnetic signal sent send into signal conditioning circuit, signal conditioning circuit is to the acoustic signals receiving, electromagnetic wave signal amplifies, filtering, the processing such as shaping, signal after processing is sent into voltage comparator after rectification module rectification, the signal of voltage comparator output is sent into single-chip microcomputer after mathematical logic processing of circuit, single-chip microcomputer carries out analyzing and processing to the received signal, in conjunction with power cable travelling wave ranging technology, the trouble spot of measuring exactly cable.

In general the signal of sensor output is not to be continuous in time and space, and output amplitude is mV or μ V level.In carrying out the fault finding process of power cable line, before the signal conversion that will test, test signal is carried out to pre-service, and as amplification, filtering, shaping etc., the effect of acoustic vibration sensor and electromagnetic sensor becomes electric signal by various measured signals exactly.

The extraneous trickle pressure of acoustic vibration sensor energy perception changes, its principle schematic as shown in Figure 2, acoustic vibration sensor is by piezoelectric ceramic piece as we can see from the figure, the parts such as mass form, acoustic vibration sensor has the ability that the trickle pressure of energy perception changes, this is due to the reason of piezoelectric ceramic piece wherein, piezoelectric ceramic piece can be the mechanical energy of system output by the electric energy conversion of system input, also the mechanical energy of system input can be converted into the electric energy of system output simultaneously, the simplified design that is mutually converted to acoustic vibration sensing of two kinds of energy provides new approaches.In acoustic vibration sensing circuit, place mass on piezoelectric ceramic piece, along with the variation of mass quality size, piezoelectric ceramic piece can perceive this slight change, thereby makes respective reaction.When spring applies corresponding acting force to piezoelectric element and mass, acoustic vibration sensing mass and piezoelectric element close contact.

Electromagnetic sensor is the electromagnetic signal of sending when obtaining the disruptive discharge of cable line fault point.Generally adopt ferrite bar as core, and be wound around enameled wire on two ferrite bars, two rods are together in series, orthogonal placement, so just can detect the electromagnetic signal in all directions.

The utility model utilization sound magnetic is combined fixed point technology, in conjunction with power cable travelling wave ranging technology, can measure exactly the trouble spot of cable, and have advantages of simple in structure, cost is low, measuring distance is long.

Claims

1. a cable fault detection instrument, it is characterized in that: comprise signal acquisition module, signal condition module, voltage comparator, mathematical logic circuit, single-chip microcomputer, described signal acquisition module, signal condition module, voltage comparator, mathematical logic circuit, single-chip microcomputer are connected successively, signal acquisition module by the sound wave collecting from cable, electromagnetic wave signal send into that signal conditioning circuit amplifies, filtering, Shape correction, the signal after processing is sent into single-chip microcomputer and is processed through voltage comparator, mathematical logic circuit.

2. cable fault detection instrument as claimed in claim 1, is characterized in that: also comprise rectification module, described rectification module is placed between signal condition module and voltage comparator.

3. cable fault detection instrument as claimed in claim 1, is characterized in that: also comprise display screen and keyboard, described display screen is connected with single-chip microcomputer respectively with keyboard.

4. cable fault detection instrument as claimed in claim 1, is characterized in that: described signal acquisition module comprises acoustic vibration sensor and electromagnetic sensor.