CN203396897U

CN203396897U - Cable broken line fault finder

Info

Publication number: CN203396897U
Application number: CN201320513964.7U
Authority: CN
Inventors: 周芸
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-08-22
Filing date: 2013-08-22
Publication date: 2014-01-15
Anticipated expiration: 2023-08-22

Abstract

The utility model provides a cable broken line fault finder, characterized by comprising a 3V DC source, an AC signal detection circuit, an AC signal amplification circuit and a fault acousto-optic prompting circuit; the AC signal amplification circuit is composed of an NPN type transistor VT2, a resistor R3, and a capacitor C1; the fault acousto-optic prompting circuit is composed of a PNP type transistor VT3, a resistor R4, a loudspeaker YS and a light emitting diode LED. A present DX-A type cable broken line fault test positioning instrument is high-priced and is not easy to popularize in the scope of work such as cable maintenance and electrician work. The cable broken line fault finder overcomes existing problems, and can be used for searching unheated fault points of broken heating blanket heating wires and specific locations of building lighting circuit wiring, thus is a fault finder capable of rapidly and accurately finding out breakpoint fault positions.

Description

Cable disconnection fault finder

Technical field

The utility model belongs to electronic technology and cable maintenance field, relates to a kind of cable disconnection fault finder.

Background technology

On market, DX-A molded line cable disconnection fault test position fix instrument is specially for cables manufacturing Chang, unit in charge of construction and electric wire applying unit are searched a kind of instrument that cable disconnection fault is developed.This instrument is to develop and form on summary has absorbed the practical experience basis of all kinds of cable fault point measurements, reparation.DX-A molded line cable disconnection fault test position fix instrument is comprised of the range observation of digitizing breakpoint, breakpoint fine positioning signal source, breakpoint fine positioning detector three parts.The features such as this instrument has breakpoint range observation, breakpoint fine positioning signal source breakpoint fine positioning detector, full digital demonstration, level of integrated system is high, volume is little, lightweight, easy to carry.It has overcome the subjective error that pointer detector is artificially proofreaded scale in the past, even without the staff of any practical experience, can accurately find breakpoint place equally.

But DX-A molded line cable disconnection fault test position fix instrument exist price high, in the working ranges such as maintaining cables and electrician, be difficult for the problems such as universal, in order to make up and to overcome these problems, be necessary to develop a kind of cheap, practical, testing result reliable, be easy to universal cable disconnection fault finder.The utility model can, for electric blanket heating wire not the searching of heating accident point that fracture, can also be found with it the particular location of building lighting circuit wiring.The utility model is a kind of instrument that tracks that can quick and precisely find out breakpoint fault position.

Below describe cable disconnection fault finder described in the utility model related relevant technologies content in implementation process in detail.

Utility model content

Goal of the invention and beneficial effect: on market, DX-A molded line cable disconnection fault test position fix instrument is specially for cables manufacturing Chang, unit in charge of construction and electric wire applying unit are searched a kind of instrument that cable disconnection fault is developed.But DX-A molded line cable disconnection fault test position fix instrument exist price high, in the working ranges such as maintaining cables and electrician, be difficult for the problems such as universal, in order to make up and to overcome these problems, be necessary to develop a kind of cheap, practical, testing result reliable, be easy to universal cable disconnection fault finder.The utility model can, for electric blanket heating wire not the searching of heating accident point that fracture, can also be found with it the particular location of building lighting circuit wiring.The utility model is a kind of instrument that tracks that can quick and precisely find out breakpoint fault position.

Circuit working principle: circuit is to receive with technotron VT1 induced signal work that 220V AC power phase line produces.

If while not applying 50Hz ac signal in cable, the open-grid of technotron VT1 and conducting, make NPN type triode VT2 cut-off, and positive-negative-positive triode VT3 also ends, and LED and loudspeaker YS do not work; When detection probe approaches 220V alternating current phase line, technotron VT1 is when alternating current negative half period, affected by it and end, make NPN type triode VT2 conducting, capacitor C 1 is discharged to zero potential by NPN type triode VT2, positive-negative-positive triode VT3 conducting, LED is luminous, loudspeaker YS sounding, and when the positive half cycle of alternating current, though technotron VT1 conducting half time-of-week is too short, NPN type triode VT2 not exclusively ends, capacitor C 1 also has little time to charge to noble potential, and positive-negative-positive triode VT3 is also logical, only lighter.While arriving the negative half period of next alternating current phase line, positive-negative-positive triode VT3 is conducting completely again.Therefore,, as long as there is alternating current to exist in 220V alternating current phase line, just energy conducting of positive-negative-positive triode VT3, makes loudspeaker YS and LED send acousto-optic indication continuously, thereby determines the abort situation of cable broken string.

Technical scheme: cable disconnection fault finder, it comprises that 3V direct supply, alternating current signal detection circuit, AC signal amplifying circuit and fault acoustic-optic reminding circuit form, and is characterized in that:

Alternating current signal detection circuit: it is comprised of detection probe TX, resistance R 1, technotron VT1 and resistance R 2, detection probe TX connects the grid G of technotron VT1 by resistance R 1, drain D connecting resistance R2 one end of technotron VT1 and AC signal amplifying circuit, the anodal VCC of other end connection circuit of resistance R 2, the source S connection circuit ground GND of technotron VT1;

AC signal amplifying circuit: it is comprised of NPN transistor VT2, resistance R 3 and capacitor C 1, the base stage of NPN transistor VT2 connects the drain D of technotron VT1, collector connecting resistance R3 one end of NPN transistor VT2 and one end of capacitor C 1, the anodal VCC of other end connection circuit of resistance R 3, the other end connection circuit ground GND of the emitter of NPN transistor VT2 and capacitor C 1;

Fault acoustic-optic reminding circuit: it is comprised of PNP transistor VT3, resistance R 4, loudspeaker YS and LED, the base stage of PNP transistor VT3 connects the collector of NPN transistor VT2 by resistance R 4, the collector of PNP transistor VT3 connects the negative pole of LED by loudspeaker YS, the anodal VCC of anodal connection circuit of LED, the emitter connection circuit ground GND of PNP transistor VT3;

3V DC power anode is connected with circuit anode VCC, and 3V DC power cathode is connected with circuit ground GND.

Accompanying drawing explanation

Accompanying drawing is the embodiment circuit working schematic diagram that the utility model provides a cable disconnection fault finder.

Embodiment

According to cable disconnection fault finder circuit working schematic diagram shown in the drawings and accompanying drawing explanation, and according to annexation between components and parts in the each several part circuit described in utility model content, and the components and parts technical parameter described in embodiment requires and circuit production main points are implemented to realize the utility model, below in conjunction with embodiment, correlation technique of the present utility model is further described.

The selection of components and parts and technical parameter

VT1 is technotron, and the model of selecting is 3DJ6;

VT2 is NPN type triode, and the model of selecting is 3SC8050, requires β >=120;

VT3 is positive-negative-positive triode, and the model of selecting is 3SC8550, requires β >=120;

LED is light emitting diode, selects diameter ￠ 5 red light emitting diodes;

Resistance R 1 is 1/4 metalfilmresistor, and its resistance is 150K Ω;

Resistance R 2, R3 are 1/4 metalfilmresistor, and its resistance is 10K Ω;

Resistance R 4 is 1/4 metalfilmresistor, and its resistance is 430 Ω;

C1 is electric capacity, and its capacity is 0.82 μ F;

The impedance of loudspeaker YS is 16 Ω, 0.1W permanent-magnet loudspeaker, and selecting model is YD55-A;

3V direct supply uses the common manganese-zinc battery of two joint 1.5V.

Circuit production main points, circuit debugging and using method

Because of the circuit structure of cable disconnection fault finder fairly simple, as long as the electronic devices and components performance of generally selecting is intact, and the components and parts annexation in accompanying drawing is welded to specifications, physical connection line and welding quality are after careful inspection is correct, and circuit of the present utility model does not substantially need to carry out any debugging and can work;

Whole circuit board all packs in a plastic casing together with loudspeaker YS battery, to be convenient for carrying and to use, after the grid G of technotron VT1 is welded in to printed board, the grid G of technotron VT1 is by detection probe of making of ￠ 1.8mm bare copper wire of resistance R 1 welding;

Before circuit debugging, first connect 3V direct supply, the drain D voltage-to-ground < 0.7V of technotron VT1, while then touching detection probe TX with hand, the drain D voltage-to-ground of technotron VT1 should > 0.7V, and now loudspeaker YS should be able to sounding; Otherwise should carefully check whether the performance of components and parts and welding quality have problem, if sensitivity is on the low side, well behaved technotron of interchangeable has a try again;

The detection probe TX of cable disconnection fault finder slowly moves along the trend of cable to be checked, as loudspeaker YS by noiseless to sound, or by sound when noiseless, be exactly cable broken string position herein.

Claims

1. a cable disconnection fault finder, it comprises that 3V direct supply, alternating current signal detection circuit, AC signal amplifying circuit and fault acoustic-optic reminding circuit form, and is characterized in that:

Described alternating current signal detection circuit is comprised of detection probe TX, resistance R 1, technotron VT1 and resistance R 2, detection probe TX connects the grid G of technotron VT1 by resistance R 1, drain D connecting resistance R2 one end of technotron VT1 and AC signal amplifying circuit, the anodal VCC of other end connection circuit of resistance R 2, the source S connection circuit ground GND of technotron VT1;

Described AC signal amplifying circuit is comprised of NPN transistor VT2, resistance R 3 and capacitor C 1, the base stage of NPN transistor VT2 connects the drain D of technotron VT1, collector connecting resistance R3 one end of NPN transistor VT2 and one end of capacitor C 1, the anodal VCC of other end connection circuit of resistance R 3, the other end connection circuit ground GND of the emitter of NPN transistor VT2 and capacitor C 1;

Described fault acoustic-optic reminding circuit is comprised of PNP transistor VT3, resistance R 4, loudspeaker YS and LED, the base stage of PNP transistor VT3 connects the collector of NPN transistor VT2 by resistance R 4, the collector of PNP transistor VT3 connects the negative pole of LED by loudspeaker YS, the anodal VCC of anodal connection circuit of LED, the emitter connection circuit ground GND of PNP transistor VT3;

Described 3V DC power anode is connected with circuit anode VCC, and 3V DC power cathode is connected with circuit ground GND.