CN201007732Y

CN201007732Y - Winding deformation test plier

Info

Publication number: CN201007732Y
Application number: CNU2007201034706U
Authority: CN
Inventors: 毕建刚; 鞠登峰; 李会兵
Original assignee: BEIJING FUAN ELECTRIC CORP
Current assignee: China Electric Power Research Institute Co Ltd CEPRI
Priority date: 2007-02-05
Filing date: 2007-02-05
Publication date: 2008-01-16
Anticipated expiration: 2017-02-05

Abstract

The utility model relates to a pair of tongs for winding deformation. The utility model is characterized in that the testing tongs comprises a left tongs body, a right tongs body, and a centre shaft provided between the left tongs body and the right tongs body and a main spring sleeved on the center shaft. Two ends of the main spring respectively extend into the left tongs body and the right tongs body, and the main spring integrates the left tongs body and the right tongs body by a rivet. The inner side of the head of the left tongs body is fixedly connected with a motionless jaw, the outer side of the head of the left tongs body is provided with a communicating terminal and an earth terminal, and the end of the tail portion of the left tongs body is equipped with a cable slot for fixing communicating cables and testing earth wires. A coupling circuit is arranged among the communicating terminal, the motionless jaw and an earth wire terminal. The inner side of the head of the right tongs body is connected to a mobile jaw via pin joint by a rivet. The rivet is sleeved with an auxiliary spring of which two ends are respectively connected to the mobile jaw and head portion of the right tongs body. The middle portion of a clamping surface of the motionless jaw and the mobile jaw are correspondingly recessed in an arc shape, and the complete calming surface is formed in an anti-slip zigzag shape. The utility model has the advantages of convenient usage, reliable data of testing results and is capable of wide application for testing characteristic curve of winding deformation of a power transformer in various environments.

Description

A kind of winding deformation testing clamp

Technical field

The utility model relates to a kind of power test instrument, particularly about a kind of winding deformation testing clamp to the test of winding deformation of power transformer family curve.

Background technology

The testing clamp that generally is used for the testing high voltage electrical equipment, its major function are the curtage of testing high voltage electrical equipment, and for the test of winding deformation of power transformer, then exist following obviously not enough.Winding deformation is meant the axial or radial dimension conversion that Winding in Power Transformer takes place under mechanical force or electrodynamic action, be usually expressed as features such as winding bird caging, bulge or displacement.It directly influences the safe operation of transformer.Can diagnose winding whether to deform by the Frequency Response curve that detects Transformer Winding.Therefore, test Transformer Winding Frequency Response curve is a very important job.

The problem that prior art exists: 1, not having the Signal Matching circuit in the testing clamp, only is the metal parts that can conduct electricity, and needs the outer signal match circuit during test, has not only increased number of fitting parts, also introduces undesired signal easily; 2, the clamping plate type terminal of left and right caliper is fixed sturcture, and contact resistance is big, influences measurement result; 3, existing testing clamp does not have the function of fixed telecommunication cable, and in the test, cable communication terminal is fragile, influences normal communication.

Summary of the invention

At the problems referred to above, the purpose of this utility model provides a kind ofly can test the characteristic winding deformation testing clamp of winding deformation of power transformer.

For achieving the above object, the utility model is taked following technical scheme: a kind of winding deformation testing clamp, it is characterized in that, it comprises: left caliper, right caliper body, be arranged on the axis between the described left and right caliper, be set in the main spring on the described axis, described left and right caliper is stretched at the two ends of described main spring respectively, and by a rivet described left and right caliper is linked into an integrated entity; The inboard fixedly connected one static jaw of described left caliper head, arranged outside communication terminal and ground terminal, described communication terminal is connected with the external communication cable, ground terminal is connected with the external testing ground wire, described left caliper tail end is provided with the cable draw-in groove of fixing described communication cable and test ground wire, is provided with match circuit between described communication terminal, static jaw and the ground wire terminal; Described right caliper body head inboard articulates a moving jaw by a rivet, a sheathed auxiliary spring on the described rivet, the two ends of described auxiliary spring connect moving jaw and right caliper body head respectively, described quiet, moving jaw clamping face middle part is corresponding curved recessed, and whole clamping face is anti-skidding zigzag.

Described match circuit comprises: the core of two described communication terminals is connected by welding lead with described static jaw, the screen layer of described ground terminal with described communication terminal is connected by welding lead, with two 100 Ω resistance of welding between the core of described communication terminal and the ground terminal.

Described communication terminal comprises two cable connection posts.

Described left and right caliper bottom is arranged with the handle rubber sleeve respectively, and described rubber sleeve surface is covered with the granule of projection.

The utility model is owing to take above technical scheme, and it has the following advantages: 1, the utility model since in caliper integrated Signal Matching circuit, therefore need not external matching unit, disturb so can reduce signal.2, the utility model since will be wherein a side jaw be arranged to rotate the moving jaw of adjusting, so the utility model can adjust jaw automatically according to the terminal shape of clamping, guarantees that jaw contacts with the good of terminal, reduces contact resistance.3, the utility model since therein the afterbody of a caliper be provided with the cable draw-in groove; therefore can communication cable is fixing wherein; avoid the end of communication cable and test ground wire stressed, protected communication terminal and ground terminal not to be damaged preferably, guaranteed the good communication effect.4, the utility model is simple in structure, and is easy to use, and test result data is reliable, and it can be widely used in the winding deformation of power transformer family curve test in the various environment.

Description of drawings

Fig. 1 is the utility model structural representation

Fig. 2 is that the A-A of Fig. 1 analyses and observe a left side and looks synoptic diagram

Fig. 3 is that the B-B of Fig. 1 analyses and observe the right side and looks synoptic diagram

Fig. 4 is the vertical profile synoptic diagram of Fig. 1

Fig. 5 is the utility model match circuit figure

Embodiment

Below in conjunction with drawings and Examples, the utility model is described in detail.

Shown in Fig. 1～4, the utility model comprises: a left caliper 1 and a right caliper body 2, all has a pivot joint position of protruding at left and

right caliper

1,2 middle parts, and between two pivot joint positions, be provided with an axis 3, a sheathed main spring 4 on axis 3, the two ends of main spring 4 are stretched into respectively in the left and

right caliper

1,2, with a rivet 5 left caliper 1, axis 3 and right caliper body 2 are run through being fixed up simultaneously, form the body frame structure of the utility model testing clamp.Main spring 4 effect be like this, when with palmistry when holding left and

right caliper

1,2 bottoms with a firm grip, main spring 4 is compressed, left and

right caliper

1,2 heads just can open, clamp tested terminal, both made the hand that unclamps the left and

right caliper

1,2 of holding with a firm grip this moment, because the restoring force of main spring 4 still can make the head of left and

right caliper

1,2 clamp tested terminal, and can not unclamp.

As Fig. 2, shown in Figure 4, left caliper 1 head is inboard by rivet 6 fixedly connected one static jaws 7, and the clamping face of static jaw 7 middle part is curved recessed 8, and whole clamping face is anti-skidding zigzag.Left caliper 1 head arranged outside, one a communication terminal 9 and a ground terminal 10, communication terminal 9 comprises two cable connection posts, communication terminal 9 and ground terminal 10 interior welds, one match circuits (as shown in Figure 5), promptly the core of two communication terminals 9 and static jaw 7 are connected by welding lead, ground terminal 10 is connected by welding lead with the screen layer of communication terminal 9, two 100 Ω resistance of welding between the core of communication terminal 9 and the ground terminal, like this match circuit is integrated in the testing clamp, has improved the stable, reliable of signal.Communication terminal 9 is connected with the external communication cable, and ground terminal 10 is connected with the external testing ground wire.As shown in Figure 3, Figure 4, left caliper 1 tail end is provided with three skewed slots as cable draw-in groove 11, the communication cable that is used for fixing two connection communication terminals 9 is connected the test ground wire of ground terminal 10 with one, avoid the end of communication cable and ground wire stressed, damage communication terminal 9 and ground terminal 10.

Right caliper body 2 heads are inboard to articulate a moving jaw 13 by a rivet 12, a sheathed auxiliary spring 14 on rivet 13, and an end of auxiliary spring 14 connects moving jaw 13, and the other end connects right caliper body 2 heads.The clamping face of moving jaw 13 middle part is also curved recessed 15, and whole clamping face also is anti-skidding zigzag.When left and

right caliper

1,2 heads open the tested terminal of clamping, moving jaw 13 can rivet 12 be that axle rotates, the jaw shape and the position of two arcs recessed 8,15 between automatic adjusting and the static jaw 7, thereby can adapt to various terminal shapes, such as the column type terminal (11～60mm), the template terminal (1～25mm) etc., make dynamic and static jaw 15, the 8 clamping effect between the two of ending more stable, firm.

As Fig. 1, shown in Figure 4, above-mentioned left and

right caliper

1,2 bottoms are arranged with the surface respectively and are covered with protruding short grained

handle rubber sleeve

16,17, and the cable draw-in groove 11 on the left caliper 1 is not covered by handle rubber sleeve 16.

The utility model winding deformation testing clamp is mainly used in the characteristic test of winding deformation of power transformer, and its using method is as follows:

At first need to use two the utility model testing clamps, one the signal excitation end of clamping power transformer, and the signal response end of another clamping power transformer is connected with testing tool with the communication terminal 9 of communication cable with two testing clamps simultaneously.During test, testing tool excitation passage produces pumping signal, pumping signal is delivered to the communication terminal 9 of testing clamp of the signal excitation end of clamping power transformer by communication cable, pass through the match circuit that links to each other with this communication terminal 9 again, pumping signal is injected in the tested Winding in Power Transformer through static jaw 7 after the processing of match circuit; Pumping signal is through Transformer Winding, come out from responder, the match circuit of another testing clamp of the signal response end of process clamping power transformer, communication cable by being attached thereto again, get back to the response channel of testing tool, testing tool produces relevant treatment by gathering the signal of returning, and generates winding Frequency Response curve.

Claims

1. winding deformation testing clamp, it is characterized in that, it comprises: left caliper, right caliper body, be arranged on the axis between the described left and right caliper, be set in the main spring on the described axis, described left and right caliper is stretched at the two ends of described main spring respectively, and by a rivet described left and right caliper is linked into an integrated entity;

The inboard fixedly connected one static jaw of described left caliper head, arranged outside communication terminal and ground terminal, described communication terminal is connected with the external communication cable, ground terminal is connected with the external testing ground wire, described left caliper tail end is provided with the cable draw-in groove of fixing described communication cable and test ground wire, is provided with match circuit between described communication terminal, static jaw and the ground wire terminal;

Described right caliper body head inboard articulates a moving jaw by a rivet, a sheathed auxiliary spring on the described rivet, the two ends of described auxiliary spring connect moving jaw and right caliper body head respectively, described quiet, moving jaw clamping face middle part is corresponding curved recessed, and whole clamping face is anti-skidding zigzag.

2. a kind of winding deformation testing clamp as claimed in claim 1, it is characterized in that: described match circuit comprises: the core of two described communication terminals is connected by welding lead with described static jaw, the screen layer of described ground terminal with described communication terminal is connected by welding lead, with two 100 Ω resistance of welding between the core of described communication terminal and the ground terminal.

3. a kind of winding deformation testing clamp as claimed in claim 1 is characterized in that: described communication terminal comprises two cable connection posts.

4. a kind of winding deformation testing clamp as claimed in claim 2 is characterized in that: described communication terminal comprises two cable connection posts.

5. as claim 1 or 2 or 3 or 4 described a kind of winding deformation testing clamps, it is characterized in that: described left and right caliper bottom is arranged with the handle rubber sleeve respectively, and described rubber sleeve surface is covered with the granule of projection.