CN2437541Y

CN2437541Y - Main loop transient grounding fault testing device for locomotive

Info

Publication number: CN2437541Y
Application number: CN 00245422
Authority: CN
Inventors: 刘杨琪; 马钧; 汪中琳
Original assignee: CHINESE RAILWAY COMMUNICATION AND SIGNAL CORP
Current assignee: CHINESE RAILWAY COMMUNICATION AND SIGNAL CORP
Priority date: 2000-08-18
Filing date: 2000-08-18
Publication date: 2001-07-04
Anticipated expiration: 2010-08-18

Abstract

The utility model relates to a testing device for the main loop transient grounding fault of a locomotive. The utility model comprises a magnetic ring, a coil is wound on the magnetic ring, and both ends of the coil are the signal output terminals of the testing device for the main loop transient grounding fault of a locomotive, and the input and output loop of a traction motor passes through the magnetic ring. The testing device which is not electrically connected with the main loop of the locomotive has the advantages of simple circuit and convenient installation. The utility model can test the on-line transient grounding fault on a DC side.

Description

Locomotive major loop instant earthing failure detector

The utility model relates to a kind of detecting device, especially a kind of locomotive major loop instant earthing failure detector that is used for diesel-electric locomotive.

Prior art is Static Detection such as megger detection, ac voltage withstanding and DC break down voltage to the detection means of locomotive major loop earth fault.These method of inspections are difficult to differentiate position of fault, therefore, press for a kind of locomotive major loop instant earthing failure detector aborning, address the above problem.

The purpose of this utility model provides a kind of online locomotive major loop instant earthing failure detector, and circuit is simple and few with the line of locomotive, in the instant earthing fault detection to DC side, can differentiate earth fault moment and occur in which traction loop.

For achieving the above object, a kind of locomotive major loop instant earthing failure detector that the utility model proposes, comprise a magnet ring, on magnet ring, be wound with coil, two terminations of coil are the signal output part of locomotive major loop instant earthing failure detector, and described magnet ring is passed in the input and output loop of traction electric machine.

Advantage of the present utility model and characteristics are: locomotive major loop instant earthing failure detector and locomotive major loop are not electrically connected, and can avoid the influence to locomotive, and circuit is simple, easy for installation, can realize online DC side instant earthing fault detection.

Description of drawings is as follows:

Fig. 1 is the scheme drawing of locomotive major loop instant earthing failure detector of the present utility model;

Fig. 2 is the installation circuit diagram of locomotive major loop instant earthing failure detector of the present utility model.

The most preferred embodiment of existing accompanying drawings locomotive major loop of the present utility model instant earthing failure detector.

As seen from Figure 1, the locomotive major loop instant earthing failure detector that the utility model proposes comprises a magnet ring 1, is wound with coil 2 on magnet ring 1, and two terminations 3 of coil are the signal output part of locomotive major loop instant earthing failure detector.More than constituted the elementary cell of locomotive major loop instant earthing failure detector of the present utility model.

The locomotive major loop instant earthing failure detector that the utility model proposes utilizes electromagnetic induction principle work, the magnetic field that the electric current of variation changes, the electro-motive force that the magnetic field of variation changes.A detecting device entangles the input line and the output line of a traction electric machine simultaneously, when not having earth fault, the size of current that flows through in the magnet ring 1 equates, direction is opposite, the inducing current that produces on magnet ring 1 is zero, when earth fault, the electric current that flows through in the magnet ring 1 changes, and produces electro-motive force on magnet ring 1, make the inducing current that produces in the coil 2, electric signal output is arranged.

Now referring to Fig. 2, described magnet ring 1 is passed in the input and output loop of traction electric machine.Six dc traction motors are generally arranged, and same magnet ring is passed in the input and output loop of every dc traction motor, thereby, the instant earthing breakdown signal of corresponding motor is provided.In actual conditions, when the instant earthing fault took place, the different signal output of generation of every road magnet ring after signal processing circuit is handled, can be judged accordingly.

Claims

1, a kind of locomotive major loop instant earthing failure detector, it is characterized in that comprising a magnet ring, be wound with coil on magnet ring, two terminations of coil are the signal output part of locomotive major loop instant earthing failure detector, and described magnet ring is passed in the input and output loop of traction electric machine.