CN2305678Y

CN2305678Y - Descriminator for fault cable

Info

Publication number: CN2305678Y
Application number: CN 97214880
Authority: CN
Inventors: 崔英彦
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-05-07
Filing date: 1997-05-07
Publication date: 1999-01-27
Anticipated expiration: 2007-05-07

Abstract

The utility model relates to an identifying apparatus for a fault cable, which is composed of a signal transducer, an actuating element and a warning circuit, wherein, the signal transducer is provided with a coil B which is wound on a mouth type iron core, the actuating element is provided with a grounding relay DJ, and the warning circuit is provided with a light-emitting diode LED and a warning integrated block 11; the output end of the latter is connected with a speaker SP. The utility model has the advantages of convenient and simple use and accuracy, is free from the environmental limit and need not spare cables or is laid with temporary lines; the similar results which are caused by the unbalance of the fault cable and a three-phase power supply can be identified accurately, and the identified results are displayed by adopting sound and light; the utility model is convenient and visual and can not affect other operations which are carried out simultaneously.

Description

A kind of failure cable identifier

The utility model relates to a kind of improved failure cable identifier, belongs to the electrical Instrument technology field.

Power cable is widely used in electric power transmission line, and when having an accident, how promptly finding out guilty culprit is the eternal theme that the power supply technique personnel explore always.At present a lot of to the position measurement method of Method of Cable Trouble Point, but in several cables that are laid in together, the method that identify the cable that has an accident but seldom.Common have clamp reometer method of testing, sound signal are listened to method or the like.Though these methods can be found out target cable, also there are some defectives of self.Such as clamp reometer method, the detection current return need be provided with the cable in stock in the cable that is laid in, perhaps apply a temporary track as the loop along the failure cable trend.Very trouble does not even allow to lay temporary track at special occasions, and this has just more incured loss through delay the processing time.Simultaneously, also there is poor sensitivity in clamp table method, and it is big require to detect electric current, when failure cable more than a km, perhaps cable size is thicker, more shows its disadvantage.In addition, the indication of the pointer of clamp table method, not obvious in hour indication of detection electric current, the clamp list index also can be indicated when the threephase load current imbalance appears in cable.Thereby be easy to cause erroneous judgement, the result causes personal equipment injury.Listen to method for sound signal, it is to pass to sound signal or other signal in the core of failure cable.Go to listen to along cable jacket with transistor radio.Because the signal that frequency is high can be responded in other cable core or in the armor of cable, radio is understood these signals of uppick equally, also is easy to cause erroneous judgement, therefore this method is seldom used.

The purpose of this utility model provides a kind of design proposal that can identify failure cable accurately and effectively from several operating cables rapidly.

The purpose of this utility model is achieved in that

A kind of failure cable identifier, it is made up of signal transducer, executive component and warning circuit, its basic improvements are: described signal transducer is the coil B that is wrapped on the shape of the mouth as one speaks iron core, described executive component is grounding relay DJ, described warning circuit is LED, and warning integrated package I1, wherein, the output of coil B directly meets grounding relay DJ, the latter's normally opened contact sending and receiving optical diode LED and current-limiting resistance R1, and while and integrated package I1 taking alarm, the latter's output meets loudspeaker SP.

Above-mentioned cable identifier, the sectional area of described iron core are not less than 8 square centimeters, and the number of turns of coil B is the 10-60 circle.

According to the failure cable identifier that the utility model is made, using method simply, accurately, is not subjected to environmental restraint, does not need cable in stock or lays temporary track, and the identical result that failure cable and three-phase supply imbalance are caused can accurately differentiate; Test is little with load current, and small volume and less weight is more showed its superiority to remote failure cable discriminating; Identification result adopts acousto-optic to show that intuitive and convenient does not influence and carries out other operation simultaneously.

The utility model is described in further detail below in conjunction with accompanying drawing:

Fig. 1 is an electrical schematic diagram of the present utility model;

Fig. 2 is the using method synoptic diagram of the utility model when being used for cable fault and differentiating.

The detection signal of failure cable identifier is provided by " shape of the mouth as one speaks " iron core and coil B.When the lead that passes iron core had alternating flow to pass through, iron core produced alternating flux.This moment, coil-induced on the iron core went out signal.When this marking current during greater than the action current of relay, its normally opened contact is connected LED and warning integrated package I1, sends the warning acousto-optic.

Differentiate failure cable, at first need measure an intact heart yearn (require earth-free, insulation resistance height) in failure cable three-phase core, as the wire in the test loop, the earth is used as another line with this root line.This line one end is connected on the accessory power supply through K switch, and the other end is connected to pull-up resistor R2 (single-phase load), the other end ground connection of R2, as shown in Figure 2.Then, the identifier iron core is placed on certain bar cable under test, this moment can be with accessory power supply through the switch connection electric wire, send chimes of doom and light as fault cable identifier, this cable is likely the accident cable that will look for so, in order further to confirm, accessory power supply can be disconnected, this moment is if the warning acousto-optic stops, and after connecting again, send sound and light again, repeatedly several times, as all being The above results, can confirm that then this cable is exactly the fault electric wire.When above trouble spot, two places appearred in a cable, accident point of every processing all needed to differentiate once as stated above.

In test trouble-shooting cable, it should be noted that, in the cable of charging operation, especially the cable of three-phase low pressure operation, the three-phase load imbalance also sound and light alarm may occur, disconnected for fear of the erroneous judgement that produces because of out-of-balance current, requirement is closed branch several times with accessory power supply in the very short time after sound and light alarm occurring, be the cause of fault cause or the load unbalanced neutral point drifting that causes of the three characteristics of the middle term so as to differentiation.

Grounding relay in the utility model can adopt the JD-60 type, and its action current is 0-50MA.Accessory power supply can be selected 220V for use.Warning integrated package I1 can select the commercially available prod for use, and supply voltage is 3-18V.The core window area is 8*8 centimetre, and this size all can be suitable for for the discriminating of power cable commonly used.

Claims

1. failure cable identifier, it is made up of signal transducer, executive component and warning circuit, it is characterized in that, described signal transducer is the coil B that is wrapped on the shape of the mouth as one speaks iron core, described executive component is grounding relay DJ, described warning circuit is LED, and warning integrated package I1, wherein, the output of coil B directly meets grounding relay DJ, the latter's normally opened contact sending and receiving optical diode LED and current-limiting resistance R1, and while and integrated package I1 taking alarm, the latter's output meets loudspeaker SP.

2. cable identifier according to claim 1 is characterized in that, the sectional area of described iron core is not less than 8 square centimeters, and the number of turns of coil B is the 10-60 circle.