CN101078740A

CN101078740A - Current transformer failure self-testing device

Info

Publication number: CN101078740A
Application number: CN 200610026931
Authority: CN
Inventors: 邱锦波; 董枫; 石勇; 马士奎; 闫艳
Original assignee: Tiandi Shanghai Mining Equipment Technology Co Ltd
Current assignee: Tiandi Shanghai Mining Equipment Technology Co Ltd
Priority date: 2006-05-26
Filing date: 2006-05-26
Publication date: 2007-11-28

Abstract

The invention relates to a self detecting device for fault of current transformer, mainly solving technological problems, for example, current transformer can collect data accurately. The technological project is that a special detecting wire is set on the current transformer with the necessary of self detection; one end of the wire is connected with AC power supply by a normal opened contact of relay and the other end is connected with ground by a resistance. It is suitable for detection of current transformer of coal winning machine and similar equipments.

Description

Current transformer failure self-testing device

Technical field:

The present invention relates to a kind of instrument transformer, particularly a kind of current transformer.

Background technology:

In the digging operation process, in order to grasp the operation conditions of each motor of coalcutter, effectively judge phenomena of the failure such as short circuit, overcurrent, need on coalcutter, adopt many current transformers to carry out real-time current data collection, in the course of the work, transfinite when measuring accuracy appears in current transformer, during fault such as zero migration is excessive, control system will produce grave error to motor operating state and judge.But, the numerous issuable fault of current transformer on the above-mentioned coalcutter, under existing appointed condition, the operator is difficult in time find that its consequence bring hidden danger will for the normal operation of coalcutter, even causes an immeasurable loss.

Summary of the invention:

Technical matters to be solved by this invention is, a kind of improved current transformer failure self-testing device is provided, it can not influence under the normal operation, automatically detect faults such as its zero point drift is excessive, trueness error is excessive and do not respond fully, the integrity that guarantees online current transformer is to provide right-on image data.

The technical scheme that the present invention solves the problems of the technologies described above employing is: current transformer failure self-testing device each phase power line that stretched through on each current transformer, the secondary coil of current transformer is connected with the dynamic monitoring module, be characterized on each current transformer that need detect, being equipped with the detection line of a special use, one end of dedicated test line is connected to AC power through a relay tip, the other end ground connection of dedicated test line.When start, at first self-checking unit guarantees that relay tip disconnects on the detection line, each current transformer image data should if a current transformer signal transfinites, can be judged as the zero point drift fault in setting range, self-checking unit is with the relay tip closure subsequently, electric current is a definite value on its detection line, and each mutual inductor is measured signal value also should be identical, transfinites as a certain electric current inductor signal, it is excessive then can be judged as trueness error, realizes fault self-diagnosis thereby should change.

The present invention is provided with the failure self-testing device that a dedicated test line forms on all current transformers, when start, can carry out fault self-diagnosis to each current transformer, having overcome in the past, current transformer is difficult to judge that zero migration is excessive, the difficulty of faults such as the measuring accuracy deviation is excessive with simple structure, realizes the self-monitoring function of current mulual inductor malfunction, not only real broken traditional technical barrier, and have great practical value and economic benefit.

Description of drawings:

Fig. 1 is the current transformer failure self-testing device synoptic diagram.

Embodiment:

With reference to Fig. 1, current transformer failure self-testing device includes special-purpose detection line 1, AC power 2, relay normally open contact 3, current transformer 4, dynamic monitoring module 5, resistance 6, wherein: special-purpose detection line 1 is the line that the device spy adds, special-purpose detection line 1 is to pass the current transformer 4 that all need detect on the coalcutter, one end of this line is connected in stable AC power 2, its other end ground connection;

AC power 2 is stable AC power, and the supply voltage value of its setting can be 1 volt to 380 volts, makes current transformer failure self-testing device can adapt to the various different demands that detect specification;

Relay normally open contact 3 is the relay normally open contacts 3 that are connected in dedicated test line 1 power end, is that it opens or closes by 5 controls of dynamic monitoring module;

Current transformer 4, it is the detected object of current transformer failure self-testing device, its quantity is to be decided by required setting on the coalcutter, Fig. 1 represents it is the current transformer 4 that 4 need detect, need each current transformer 4 of detection, except each phase power line correspondence was passed, the spy added a dedicated test line, passed all current transformers that need detect 4;

Dynamic monitoring module 5 includes mutual inductor power supply 51, transducer signal input interface 52, relay control output interface 53 and relevant detection instrument etc., all utilizes existing coal mining airborne equipment.

Resistance 6, it is the earth terminal that is connected in special-purpose detection line 1, this resistance in order to the voltage matches of AC power 2, use the setting current value of the detection line that forms the current transformer failure self-testing device special use, the respective resistivity values of resistance 6 be 1 ohm to 20k ohm.

The function of current transformer failure self-testing device is: when each system powers on, the controller of dynamic monitoring module 5 at first is to guarantee that relay normally open contact 3 is to be in off-state, the data that this moment, each current transformer that need detect 4 collected, transducer signal input interface 51 inputs of ultromotivity monitoring modular 5, and on corresponding instrument, show and record, the data of this collection should be in the setting range of self-test device, if the signal of certain current transformer 4 secondary coil transfinites, just can be judged as the zero point drift fault; The controller action of current transformer self-test device dynamic monitoring module 5 subsequently, from relay control output interface 53 output control signals, with relay normally open contact 3 closures, at this moment, current value on the special-purpose detection line is set, and simultaneously, the measurement signal value of each current transformer 4 secondary coil that need detect also should be identical, if the numerical value of certain sensed current mutual inductor 4 secondary coil signal surpasses allowed band, just can judge that the trueness error of this current transformer 4 is excessive; At last, the controller action of dynamic monitoring module 5, output interface 53 output control signals disconnect relay normally open contact 3, in order to avoid the measuring accuracy when influencing operate as normal, the self check running program finishes.The present invention realizes above-mentioned functions, with simple apparatus structure, guarantees that the current transformer 4 of One's name is legion on the coalcutter is to be in good working order all the time, and right-on image data is provided.

Claims

1, a kind of current transformer failure self-testing device, this device each phase power line that on each current transformer, stretched through, the secondary coil of current transformer is connected with the dynamic monitoring module, it is characterized in that:

A. on each current transformer (4) that need detect, be equipped with the detection line (1) of a special use;

B. an end of Zhuan Yong detection line (1) is connected to AC power (2) through a relay normally open contact (3);

C. the other end ground connection of Zhuan Yong detection line (1).

2, current transformer failure self-testing device according to claim 1 is characterized in that AC power (2) is stable AC power, and this power source voltage is 1V to 380 volt.

3, current transformer failure self-testing device according to claim 1 is characterized in that earth terminal at detection line (1) is provided with one and the resistance (6) of AC power (2) coupling, its resistance value be 1 ohm to 20k ohm.