CN201413385Y

CN201413385Y - Motor winding failure detecting tool

Info

Publication number: CN201413385Y
Application number: CN2009200272890U
Authority: CN
Inventors: 于德军; 刘界环; 于龙春; 桂林三
Original assignee: Qingdao Port Group Co Ltd
Current assignee: Qingdao Port Group Co Ltd
Priority date: 2009-06-18
Filing date: 2009-06-18
Publication date: 2010-02-24
Anticipated expiration: 2019-06-18

Abstract

The utility model discloses a motor winding failure detecting tool which aims to overcome the defects of the prior art that when the insulation of some windings on a motor is damaged, all windings need to be detached and replaced, so the time and the labor are wasted, the repairing cost is improved and the repairing time is long; and discharge pins are connected parallelly on both ends of a secondary coil of an AC transformer. Because the detecting tool is connected with the discharge pins on the secondary coil of the AC transformer, when both ends of the discharge pins are respectively connected with the windings and a grounded motor case, if the insulating resistance at some position of a tested winding is reduced, the discharge pins generate discharge arc at the point, thereby finding out windings with problems and failures without detaching and replacing all the windings and even without detaching and replacing the failing windings, and the problem can be solved only by local handling; and therefore, the tool saves time and labor, can save repairing cost and reduce the repairing time, thereby shortening the repairing period and saving time for safety production.

Description

Motor windings trouble spot testing tool

Technical field

The utility model belongs to instrument, specifically a kind of instrument that is used for accurately detecting the motor windings trouble spot.

Background technology

In electrical machmary maintenance, through regular meeting one or several insulation damages in the winding of motor appears having caused because of certain reason.When the winding insulation of motor damages, also not having at present accurately to judge is the method which winding goes wrong, the replacing of winding all can only being dismantled, no matter the winding of dismantling is out of order or does not have fault, all can't re-use, so not only time-consuming, effort has also caused the waste that does not have the fault winding, increase maintenance cost, prolonged servicing time.

The utility model content

Technical problem to be solved in the utility model is, when the winding insulation that overcoming prior art has on finding motor damages, need replacings of dismantling of whole windings, the shortcoming that time-consuming, effort, the maintenance cost that increases, servicing time are grown provides a kind of motor windings trouble spot testing tool.

In order to solve the problems referred to above that prior art exists, the utility model is to adopt following technical proposals to realize: the two ends at the AC transformer secondary coil are parallel with spray point.

The utility model also has following technical characterictic:

On the secondary coil of described transformer, be parallel with the trigger that can make spray point generation high-voltage breakdown electric arc with spray point;

In the connected loop of the secondary coil of described transformer and trigger, be in series with restrictor;

The discharging gap at described spray point two ends is adjustable in 1～5mm.

During use, the primary coil of AC transformer is connected on the ac power supply line, after the main circuit switch closure, spray point begins discharge, with the voltage-regulation restriction within the specific limits, spray point one terminates on the casing of motor ground connection then, and the other end is connected with certain motor windings that insulation descends, when electric arc appears in discharge after connecting, promptly prove the insulation damages of this winding.

Advantage of the present utility model and good effect are, because above-mentioned testing tool is to be connected with spray point on the secondary coil of AC transformer, when the two ends of spray point are connected with the motor case of winding and ground connection respectively, if tested winding somewhere insulation resistance descends, spray point will produce electrical discharge arc at this point, can accurately find out problem winding and trouble spot like this, do not need to change whole windings, even the fault winding do not needed to change yet, carrying out Local treatment can deal with problems, and therefore uses above-mentioned instrument to save time, laborsaving, can save maintenance cost, reduce servicing time, also just shortened the maintenance duration, for the time has been won in safety in production.Simultaneously, because the testing tool employing is isolating transformer, when the people touches equipment and tested end, can produce the electric shock problem, thereby protect testing staff's personal safety.

Description of drawings

Fig. 1 is a circuit diagram of the present utility model.

Embodiment

The utility model is described in further detail below in conjunction with drawings and Examples.

Among Fig. 1, the primary coil U1 of AC transformer T1 is connected on the ac power supply line, generally is to be connected on the alternating circuit of 220V, is parallel with spray point C at the secondary coil U2 two ends of AC transformer T1.The end B of described secondary coil U2 is connected with chassics earth, and its other end A can be connected on the termination of motor windings.

In order to make described spray point C when producing electric arc, can find the trouble spot intuitively, even follow a spot of smog, reach the purpose that accurately finds the trouble spot, on the secondary coil U2 of transformer T1, be parallel with the trigger CD-2 that the discharge two ends that can make spray point C produce high-voltage breakdown electric arc.

In described secondary coil U2 and loop that trigger CD-2 is communicated with, be in series with restrictor L1, trigger CD-2 charges by restrictor L1 and improves its terminal voltage, makes spray point C produce electric arc.The rectifier unshakable in one's determination that described restrictor L1 can select for use the 40W daylight lamp to use is realized.

The discharging gap of spray point C can be regulated in 1～5mm according to the needs of the high-voltage breakdown electric arc size of being regulated trigger CD-2 generation by the model size of measured motor.

During work, powered-down switch S 1, AC transformer T1 work, coil U3 on the AC transformer T1 has electricity that pilot lamp H1 is lighted, secondary coil U2 has electricity simultaneously, is trigger CD-2 charging by restrictor L1 current limliting, and produces the voltage of 1-5KV at trigger CD-2 two ends.Partial breakdown heating when tested winding somewhere insulation resistance descends can be attended by low smoke simultaneously and occur, and can find the trouble spot very intuitively, reaches the purpose that accurately finds the trouble spot, realizes local reparation.Adjust the discharging gap of spray point C as required, can change the voltage breakdown between tested winding and the casing ground.

Claims

1, a kind of motor windings trouble spot testing tool, it is characterized in that: the secondary coil two ends in AC transformer are parallel with spray point.

2, motor windings as claimed in claim 1 trouble spot testing tool is characterized in that: on the secondary coil of described transformer, be parallel with spray point and can make spray point produce the trigger of high-voltage breakdown electric arc.

3, motor windings as claimed in claim 2 trouble spot testing tool is characterized in that: in the secondary coil of described transformer and loop that trigger is communicated with, series connection has restrictor.

4, motor windings as claimed in claim 1 trouble spot testing tool, it is characterized in that: the discharging gap at described spray point two ends is adjustable in 1～5mm.