CN218567424U

CN218567424U - Lead clamp for direct current resistance test of transformer

Info

Publication number: CN218567424U
Application number: CN202222441085.XU
Authority: CN
Inventors: 黄大志; 杨春飞; 衣红印; 张辉; 刘佳佳; 王鹏飞; 翟永杰; 李智; 王金山; 王明海; 郑现州
Original assignee: Changchun Power Supply Co Of State Grid Jilinsheng Electric Power Supply Co
Current assignee: Changchun Power Supply Co Of State Grid Jilinsheng Electric Power Supply Co
Priority date: 2022-09-15
Filing date: 2022-09-15
Publication date: 2023-03-03
Anticipated expiration: 2032-09-15

Abstract

The utility model provides a transformer direct current resistance test lead wire clip, which belongs to the technical field of transformer substation high-voltage equipment acceptance tests, and comprises a metal clip, a connector, a hollow insulating rod, an insulating handle, a safety lock, a stay cord and a test lead wire, wherein one end of the hollow insulating rod is connected with the metal clip through the connector, the other end of the hollow insulating rod is provided with the insulating handle, and the insulating handle is rotationally connected with the hollow insulating rod; the metal clamp comprises two metal clamping jaws which are symmetrically arranged, and the two metal clamping jaws are rotationally connected to the connector; the safety lock is connected between the insulating handle and the hollow insulating rod, and when the safety lock is locked, the relative positions of the insulating handle and the hollow insulating rod are unchanged; the pull rope penetrates through the hollow insulating rod, and one end, far away from the connector, of the pull rope is fixedly connected to the insulating handle. Through using the utility model provides a transformer direct current resistance test lead wire clip, the effectual cost of having practiced thrift has shortened test time, has improved electric wire netting power supply reliability.

Description

Lead clamp for direct current resistance test of transformer

Technical Field

The utility model belongs to the technical field of the transformer substation high-tension apparatus acceptance test, specifically, relate to a transformer direct current resistance test lead wire clip.

Background

In the work of the acceptance test of the high-voltage equipment of the transformer substation, in order to obtain the state parameters of the equipment, evaluate the running state of the equipment and find hidden equipment hazards in time, the transformer is used as the first-turn important equipment in the transformer substation, and the direct-current resistance test of the transformer is an important index parameter for checking whether the transformer is qualified or not and whether the transformer can be normally put into use or not. In the current transformer direct current resistance test process, the installation and arrangement test wiring is usually completed by a maintenance worker carrying a bucket arm vehicle, and the maintenance worker is strictly prohibited to climb the transformer bushing to disconnect the test lead. At present, due to the progress of miniaturization technology of high-voltage equipment and the large-scale application of PASS switches and GIS combined electrical appliances, the miniaturization and the indoor formation of the transformer substation are a trend, a large number of indoor transformer substations are built and put into operation, and the traditional outdoor open-type transformer substation is hardly built any more. Indoor substation has area little, and the noise is little, advantages such as operational environment is stable, nevertheless because the building internal area is limited, and a large amount of high-tension apparatus are arranged in narrow and small space, and the experimental lead wire of the operation disconnect of reuse traditional bucket arm car has been hardly realized, if adopt the mode of building the scaffold frame not only to consume the manpower, safe distance in the experiment also is difficult to grasp moreover. In order to avoid climbing a sleeve or using an overhead working truck and reduce the working risk, an overhead testing clamp device special for a transformer direct-current resistance test is provided in the prior art, and the overhead testing clamp device is disclosed in detail in a publication number CN208953565U, but the overhead testing clamp device has the following defects in the practical transformer direct-current resistance test process: firstly, the binding clip of copper has been adopted in order to obtain good electric conductivity, and this kind of binding clip can obtain good electric conductivity admittedly, but its weight is very heavy, and the in-process that articulates transformer bushing conducting rod collides with transformer bushing's insulator very easily to cause the damage of insulator. In addition, if the clamp head cannot firmly lock the sleeve conducting rod, the high-altitude test clamp slides off, and the tested equipment can be damaged; secondly, the tightness of the contact between the tong head and the transformer bushing conducting rod is achieved through a group of gear structures at the joint of the tong head and the top end of the holding rod, the structure design has the possibility that the tong head cannot be fastened because of the clamping stagnation and the improper knob in the using process, and the structure design is unreliable in terms of safety.

SUMMERY OF THE UTILITY MODEL

In view of the technical problem who exists among the above-mentioned background, the utility model aims at providing a transformer direct current resistance test lead wire clip, through using transformer direct current resistance test lead wire clip, the effectual cost of having practiced thrift has shortened test time, has improved electric wire netting power supply reliability.

The utility model discloses a realize that the technical scheme that above-mentioned purpose adopted is: a transformer direct current resistance test lead wire clamp comprises a metal clamp, a connector, a hollow insulating rod, an insulating handle, a safety lock, a pull rope and a test lead wire; one end of the hollow insulating rod is connected with the metal clamp through a connector, the other end of the hollow insulating rod is provided with an insulating handle, and the insulating handle is rotatably connected with the hollow insulating rod; the metal clamp comprises two metal clamping jaws which are symmetrically arranged, and the two metal clamping jaws are rotationally connected to the connector; the connector comprises a fixed pipe, a spring and a connecting piece, wherein the spring and the connecting piece are arranged in the fixed pipe, one end of the connecting piece is connected with a pull rope, the other end of the connecting piece extends out of the fixed pipe and is respectively and rotatably connected with the two metal clamping jaws through two fulcrum pin shafts, and a driving mechanism formed by connecting the pull rope and the connecting piece is used for driving the two metal clamping jaws to synchronously rotate around the two fulcrum pin shafts respectively so as to enable the two metal clamping jaws to be close to or far away from each other; the spring is sleeved outside the connecting piece, the end part of the connecting piece, close to the metal clip, is provided with a limiting block, one end part of the spring leans against the limiting block, the initial state of the spring is an extension state, and the metal clip is in an opening state; when the pull rope is pulled, the limiting block moves along with the connecting piece to compress the spring, the safety lock is connected between the insulating handle and the hollow insulating rod, and when the safety lock is locked, the relative positions of the insulating handle and the hollow insulating rod are unchanged; the pull rope penetrates through the hollow insulating rod, and one end, far away from the connector, of the pull rope is fixedly connected to the insulating handle.

Further, the connector and the hollow insulating rod are connected in a threaded mode.

Further, the fixing tube of the connector has an internal thread, and the internal thread of the fixing tube is threadedly coupled with the external thread of the hollow insulating rod.

As the preferred scheme of the utility model, the hollow insulator spindle chooses for use the hollow insulator spindle of retractable.

Further, the safety lock comprises a pin shaft A, a lock catch and a pin shaft B, and the pin shaft A is fixed on the hollow insulating rod; one end of the lock catch is fixed on the pin shaft A, the other end of the lock catch is a free end, and when the safety lock is in a locking state, the free end of the lock catch buckles the pin shaft B and is fixed with the pin shaft B; when the safety lock is in a non-locking state, the free end of the lock catch is separated from the pin B; and the pin B is fixed on the insulating handle.

Furthermore, the test lead penetrates through the hollow insulating rod to be connected with a lead terminal of the direct current resistance tester.

Further, the tip cover of hollow insulator spindle is equipped with the rubber sleeve, and rubber sleeve and insulating handle are located same one end of hollow insulator spindle.

Through the above design scheme, the utility model discloses following beneficial effect can be brought: the utility model provides a transformer direct current resistance test lead wire clip, when carrying out transformer direct current resistance test, directly clip transformer bushing tip conducting rod, under the prerequisite of guaranteeing to have good contact with the sample, can not cause the damage to transformer bushing's insulator, and what adopt in the design of pinning test lead wire clip is that the powerful bullet pressure that the spring produced tightly cliies the sample, can pin the safety lock straining after the sample is cliied to the test lead wire clip, make the clip demonstrate a blocking state, be unlikely to the bullet to open, this is with regard to great improvement experimental security, guarantee direct current resistance test safety, can effectively solve the problem that exists in the current transformer direct current resistance test. Through using the test lead wire clip of transformer direct current resistance, the effectual cost of having practiced thrift has shortened test time, has improved the electric wire netting power supply reliability, has promoted user's power consumption satisfaction.

Drawings

FIG. 1 is a schematic diagram of the overall structure of a lead clamp for a DC resistance test of a transformer;

FIG. 2 is a schematic diagram showing a locking state of an insulated handle in a lead clamp for a DC resistance test of a transformer;

FIG. 3 is a schematic diagram showing a state where an insulated handle is released in a lead clamp for a DC resistance test of a transformer;

fig. 4 is a schematic diagram illustrating the working principle of the lead clamp in the direct current resistance test of the transformer.

In the figure: 1-a metal clip; 2-a connector; 3-a hollow insulating rod; 4-an insulated handle; 5-a safety lock; 6-pulling a rope; 7-test lead; 201-a fixed tube; 202-a spring; 203-a connector; 501-a pin shaft A; 502-locking; 503-Pin B.

Detailed Description

To make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the following examples and drawings, and the exemplary embodiments and descriptions thereof of the present invention are only used for explaining the present invention, and are not intended as limitations of the present invention.

As shown in fig. 1, fig. 2, fig. 3 and fig. 4, a transformer direct current resistance test lead wire clip can accomplish test wiring safely, reliably, simply and conveniently under actual conditions, thereby facilitating the development of field transformer direct current resistance test work, the transformer direct current resistance test lead wire clip comprises a metal clip 1, a connector 2, a hollow insulating rod 3, an insulating handle 4, a safety lock 5, a pull rope 6 and a test lead 7, wherein when the transformer direct current resistance test is performed, the insulating handle 4 is pressed when the safety lock 5 is in an open state, the metal clip 1 is tightened up under the pulling of the pull rope 6 to clamp a conductive rod at the end part of a transformer sleeve, the safety lock 5 is locked, after the operation is completed, the safety lock 5 is opened, the pull rope 6 is restored to an original state under the pulling force of a spring 202, and the metal clamping jaw 1 is opened. In fig. 4, a represents that the metal clip 1 is in an open state, b represents that the metal clip 1 is in a clamping state, c represents that the insulated handle 4 is in a release state, d represents that the insulated handle 4 is in a depressed state, e represents that the safety lock 5 is in a locking state, and e represents that the safety lock 5 is in a release state.

One end of the hollow insulating rod 3 is connected with the metal clamp 1 through the connector 2, the other end of the hollow insulating rod 3 is provided with the insulating handle 4, the insulating handle 4 is rotatably connected with the hollow insulating rod 3, and as a preferred scheme, the hollow insulating rod 3 is a telescopic hollow insulating rod; the metal clamp 1 comprises two metal clamping jaws which are symmetrically arranged, and the two metal clamping jaws are rotatably connected to the connector 2; the connector 2 comprises a fixed pipe 201, a spring 202 and a connecting piece 203, wherein the spring 202 and the connecting piece 203 are arranged in the fixed pipe 201, one end of the connecting piece 203 is connected with a pull rope 6, the other end of the connecting piece 203 extends out of the fixed pipe 201 and is respectively and rotatably connected with two metal clamping jaws through two fulcrum pin shafts 8, and a driving mechanism formed by connecting the pull rope 6 and the connecting piece 203 is used for driving the two metal clamping jaws to synchronously rotate around the two fulcrum pin shafts 8 respectively so as to enable the two metal clamping jaws to be close to or far away from each other; the spring 202 is sleeved outside the connecting piece 203, a limiting block is arranged at the end part of the connecting piece 203 close to the metal clip 1, one end part of the spring 202 leans against the limiting block to play a role of compressing the spring 202 when pulling the pull rope 6, the initial state of the spring 202 is an extension state, and at the moment, the metal clip 1 is in an opening state.

The safety lock 5 is connected between the insulating handle 4 and the hollow insulating rod 3, and when the safety lock 5 is locked, the relative positions of the insulating handle 4 and the hollow insulating rod 3 are unchanged; the pull rope 6 penetrates through the hollow insulating rod 3, and one end, far away from the connector 2, of the pull rope 6 is fixedly connected to the insulating handle 4.

Further, the safety lock 5 comprises a pin shaft A501, a lock catch 502 and a pin shaft B503, and the pin shaft A501 is fixed on the hollow insulating rod 3; one end of the lock catch 502 is fixed on the pin shaft A501, the other end of the lock catch 502 is a free end, and when the safety lock 5 is in a locking state, the free end of the lock catch 502 is fastened on the pin shaft B502 and fixed together with the pin shaft B; when the safety lock 5 is in a non-locking state, the free end of the lock catch 502 is separated from the pin shaft B502; the pin B503 is fixed to the insulated handle 4.

And the test lead 7 penetrates through the hollow insulating rod 3 and is connected with a lead terminal of the direct current resistance tester.

The tip cover of hollow insulator spindle 3 is equipped with the rubber sleeve, and rubber sleeve and insulating handle 4 are located same one end of hollow insulator spindle 3.

The action of the metal clip 1 is explained in the following that one end of a pull rope 6 is fixed on an insulating handle 4, the other end of the pull rope passes through a hollow insulating rod 3 and is fixed on a connecting piece 201, when the metal clip is used, the insulating handle 4 is pressed, the connecting piece 203 is pulled by the pull rope 6, a fulcrum pin shaft 8 on the connecting piece 203 drives the metal clip 1 to perform opening and closing actions, a spring 202 is sleeved on the connecting piece 201, the spring 202 is compressed when the pull rope 6 is pulled, the metal clip 1 is in an opening state, and after the insulating handle 4 is loosened, the metal clip 1 is in a closing state under the action force restored by the spring 202.

The safety lock 5 works: first, it should be noted that the safety lock 5 is designed such that when the insulated handle 4 is pressed down and the metal clip 1 clamps the conductive rod, the spring 202 in the connector 2 is in a compressed state, and then a restoring force of the spring 202 acts on the metal clip 1 through the fulcrum pin 8 to separate the metal clip 1, and in order to avoid the metal clip 1 from being opened after the hand is released, a force pressing the insulated handle 4 needs to be continuously applied to the insulated handle 4. Fix a round pin axle A501 in the position that hollow insulator spindle 3 is close to insulating handle 4, be fixed with a hasp 502 on round pin axle A501, also be fixed with a round pin axle B503 on insulating handle 4 simultaneously, when insulating handle 4 pushes down, when metal clamp 1 presss from both sides tight conducting rod, pin axle B503 on insulating handle 4 is buckled with hasp 502 on the hollow insulator spindle 3, insulating handle 4 just so has not opened loosely, metal clamp 1 also demonstrates the tight interlock state of clamp to the conducting rod, after the direct current resistance test is accomplished, open safety insurance namely safety lock 5, stay cord 6 resumes original state under spring 202 pulling force promptly: the metal clip 1 is opened.

Claims

1. A transformer direct current resistance test lead wire clamp comprises a test lead wire (7), and is characterized by further comprising a metal clamp (1), a connector (2), a hollow insulating rod (3), an insulating handle (4), a safety lock (5) and a pull rope (6); one end of the hollow insulating rod (3) is connected with the metal clamp (1) through the connector (2), the other end of the hollow insulating rod (3) is provided with the insulating handle (4), and the insulating handle (4) is rotatably connected with the hollow insulating rod (3); the metal clamp (1) comprises two symmetrically arranged metal clamping jaws which are rotatably connected to the connector (2); the connector (2) comprises a fixed pipe (201), and a spring (202) and a connecting piece (203) which are arranged in the fixed pipe (201), one end of the connecting piece (203) is connected with a pull rope (6), the other end of the connecting piece (203) extends out of the fixed pipe (201) and is respectively and rotatably connected with two metal clamping jaws through two fulcrum pin shafts (8), a driving mechanism formed by connecting the pull rope (6) and the connecting piece (203) is used for driving the two metal clamping jaws to respectively rotate synchronously around the two fulcrum pin shafts (8) so as to enable the two metal clamping jaws to be close to or far away from each other, and a limiting block is arranged at the end part of one side, close to the metal clamp (1), of the connecting piece (203); the spring (202) is sleeved outside the connecting piece (203), and one end part of the spring (202) leans against the limiting block; the safety lock (5) is connected between the insulating handle (4) and the hollow insulating rod (3), and when the safety lock (5) is locked, the relative positions of the insulating handle (4) and the hollow insulating rod (3) are unchanged; the pull rope (6) penetrates through the hollow insulating rod (3), and one end, far away from the connector (2), of the pull rope (6) is fixedly connected to the insulating handle (4).

2. The transformer direct current resistance test lead clip according to claim 1, wherein: the connector (2) and the hollow insulating rod (3) are connected in a threaded manner.

3. The transformer direct current resistance test lead clip according to claim 2, wherein: the fixing pipe (201) of the connector (2) is provided with an internal thread, and the internal thread of the fixing pipe (201) is in threaded connection with the external thread of the hollow insulating rod (3).

4. The transformer direct current resistance test lead clip according to claim 1, wherein: the hollow insulating rod (3) is a telescopic hollow insulating rod.

5. The transformer direct current resistance test lead clip according to claim 1, wherein: the safety lock (5) comprises a pin shaft A (501), a lock catch (502) and a pin shaft B (503), and the pin shaft A (501) is fixed on the hollow insulating rod (3); one end of the lock catch (502) is fixed on the pin shaft A (501), the other end of the lock catch (502) is a free end, and when the safety lock (5) is in a locking state, the free end of the lock catch (502) is buckled with the pin shaft B (503) to be fixed with the pin shaft B; when the safety lock (5) is in a non-locking state, the free end of the lock catch (502) is separated from the pin shaft B (503); and the pin B (503) is fixed on the insulating handle (4).

6. The transformer direct current resistance test lead clip according to claim 1, wherein: and the test lead (7) penetrates through the hollow insulating rod (3) to be connected with a lead terminal of the direct current resistance tester.

7. The transformer direct current resistance test lead clip of claim 1, wherein: the end cover of hollow insulator spindle (3) is equipped with the rubber sleeve, and rubber sleeve and insulating handle (4) are located same one end of hollow insulator spindle (3).