CN201788200U - Special test clip for DC resistance test - Google Patents

Abstract

A special test clamp for a direct-current resistance test comprises rectangular clamp heads, clamp bodies, insulated handles and test wire jacks. The middle of the upper clamp body and the middle of the lower clamp head are hinged together by a rotary shaft; one end of the upper clamp body and one end of the lower clamp head are connected with the upper clamp head and the lower clamp head; the other end of the upper clamp body and the other end of the lower clamp head are connected with the upper insulated handle and the lower insulated handle; the test wire jacks are axially arranged at the outer end of the cylindrical lower insulated handle; one end of each of two flexible leads is respectively connected onto the two rectangular clamp heads; and the other ends of the two flexible leads are connected with the test wire jacks. The special test clamp is simple in structure and convenient in installation and use, is safe and reliable, overcomes the shortcomings of high contact resistance and easy damage to the surface of a conductor of a past test clamp, and can minimize contact resistance when the test clamp contacts with a conductor of a device to be tested to improve precision of test data as the rectangular clamp heads are arranged at the front end of the test clamp and the conductor is large in contact surface. Besides, the clamp heads and the clamp bodies are in hinged connection and can freely move, so that the test clamp and the contact surface of the conductor are constantly in planar contact, and the test clamp not only reduces the contact resistance, but also avoids damage to the surface of the conductor.

Description

Special test clip for DC resistance test

technical field

The utility model relates to special tools for testing circuit breakers, isolating knife switches and other circuit resistances that need to be accurately measured, transformers, reactors and the like that need to accurately measure DC resistances in the electric power industry.

Background technique

At present, in the power system, whether it is to build power plants or power distribution equipment for substations (stations), when it is necessary to measure the loop resistance or DC resistance of the equipment as a high-voltage test, the previous method is to first connect the original wiring Remove and then use the test clip to clamp the terminal of the device to connect to the test line. However, this traditional method has the following problems: 1. The opening part of the test clip is a sawtooth type commonly known as an alligator clip. Because it is a point contact, the contact resistance is large. For example, the qualified value of the loop resistance for measuring 110kV isolation should be 60 microohms The left or right is about 0.06. If the test clip has a large contact resistance, it will directly affect the measurement result; 2. Due to the repeated movement of the clip when measuring with the alligator clip, the surface of the equipment clip will produce burrs, which will increase the power consumption after normal operation. Due to the existence of the above two reasons, it brings certain disadvantages to the test and operation work.

Contents of the invention

The purpose of the utility model is to provide a special test clip for DC resistance test, which can conveniently and simply connect the test line to the tested equipment, reduce the contact resistance, and overcome the shortcomings of the prior art.

The technical solution adopted to realize the purpose of the utility model is: it is composed of a rectangular chuck, a clip body, an insulating handle and a test line jack, and the upper and lower clip bodies are hinged together through a rotating shaft, and one end is connected to the upper and lower chucks. The other end is connected to the upper and lower insulating handles; a test line socket is axially provided at the outer end of the cylindrical lower insulating handle, and one end of the two flexible wires is respectively connected to two rectangular chucks, and the other end is connected to the test line socket.

Two rectangular chucks are hinged on the upper and lower clip bodies.

Rectangular collets are copper with tin-plated construction.

The positive effects of the utility model are: simple structure, convenient installation and use, safety and reliability, which makes up for the shortcomings of the previous test clips with large contact resistance and easy damage to the conductor surface; The contact resistance is minimized when the clip is in contact with the conductor of the device under test, which improves the accuracy of the test data; because the contact surface of the front conductor is flat and connected with the test clip body by a hinge, it can move freely so that the test clip and the conductor contact surface are always It is planar contact, which reduces the contact resistance and does not damage the conductor surface.

Description of drawings

Accompanying drawing 1 is the structure schematic diagram of the present utility model; Accompanying drawing 2 is the top view schematic diagram of accompanying drawing 1.

Detailed ways

As shown in Figures 1 and 2, it consists of a rectangular chuck 1, a clip body 2, an insulating handle 3 and 4 holes for test line insertion. The middle of the clip body 2 is hinged together by the rotating shaft 5, one end is respectively connected to the upper and lower two rectangular chucks 1, and the other end is respectively connected to the upper and lower insulating handles 3; the upper and lower insulating handles 3 are cylindrical, and the diameter of the lower insulating handle is larger than that of the upper insulating handle Larger, with a test line jack 4 axially provided at its outer end; one end of two 16mm ² multi-strand annealed copper wires 6 is respectively welded on two rectangular chucks 1, and the other end is connected to the test line jack 4; Chuck 1 adopts copper tin-plated structure.

The use method of the utility model is: insert the test line into the test line insertion hole 4, and then clamp the rectangular chuck 1 of the test clip on the conductor of the device under test, so that the clamp rectangle can be evenly contacted with the measured conductor. test.

Claims (3)

1. the special-purpose test of direct current resistance test is pressed from both sides, it is characterized in that: it is made up of rectangle chuck, clamp body, insulation handle and test wire jack, two clamp bodies are middle hinged through rotating shaft up and down, and an end connects two chucks up and down, and the other end connects two handles that insulate up and down; Be axially arranged with the test wire jack at the cylindrical handle outer end of insulation down, two flexible circuit conductor one ends are connected on two rectangle chucks, and the other end connects the test wire jack.

2. the special-purpose test folder of direct current resistance according to claim 1 test is characterized in that: two rectangle chucks are hinged on up and down on two clamp bodies.

3. the special-purpose test folder of direct current resistance test according to claim 1 and 2, it is characterized in that: the rectangle chuck adopts the zinc-plated structure of copper.

Images