CN201548679U - A claw-horn current transformer testing device - Google Patents

Abstract

The utility model relates to the calibration field of current transformers in electric energy measurement, and discloses a claw-type current transformer testing device. It includes a bracket, two rows of junction blocks at the front and back arranged on the bracket, the row spacing is the same as that of the primary leads of the claw-horn current transformer, and the junction blocks of different rows are staggered from left to right, and each junction block is provided with two electrical connections. a connecting terminal; the connecting block includes an insulating block fixed on the bracket and a conductive copper block fixed on the insulating block, and the connecting terminal is provided at both ends of the conductive copper block for placing the primary lead of the claw-type current transformer. It is composed of the outer rectangular slot and the crimping screw arranged on the upper wall of the rectangular slot.

Description

A claw-horn current transformer testing device

technical field

The utility model relates to the calibration field of current transformers in electric energy metering, in particular to a claw-horn type current transformer testing device.

Background technique

The current transformer is installed in the secondary circuit of power line measurement, and its operation should meet the "error measured under the specified current value meets the error limit specified in the regulations". Therefore, the current transformer needs to be tested for error before installation or after running for a certain period of time.

At present, there are generally two types of low-voltage current transformers: croissant type and through-heart type. Feedthrough current transformers are very convenient in error testing, and multiple current transformers can be tested at the same time in the test line each time to improve efficiency. However, for the claw-horn current transformers that account for about 40% of the total at present, only a single test can be performed, and the efficiency is low. In addition, in the traditional way, wiring pliers are used to connect the primary incoming and outgoing lines to the test power supply. The contact area of the primary side of the current transformer is small, which causes the test equipment to be unable to find the test point for a long time, wasting time; in addition, the test time is long during the high-current test, which causes the test equipment, current transformer, and test line to heat up, causing personal and equipment damage. security threat.

Contents of the invention

The purpose of the utility model is to provide a claw-horn current transformer testing device, which can be connected conveniently and test multiple claw-horn current transformers at the same time, and has high efficiency and good safety.

In order to achieve the above object, the utility model adopts the following technical solutions to achieve.

A claw-horn type current transformer testing device is characterized in that it includes a bracket, two rows of junction blocks at the front and rear arranged on the bracket, the row spacing is the same as that of the primary lead wires of the horn-type current transformer, and the junction blocks of different rows are connected to each other on the left and right sides. Staggered, each terminal block is provided with two terminal blocks for electrical connection.

Further improvement and characteristics of the present utility model are:

The junction block includes an insulating block fixed on the bracket and a conductive copper block fixed on the insulating block, and the connecting terminal is provided at both ends of the conductive copper block for placing the primary lead wire of the claw-type current transformer. And it is composed of crimping screws arranged on the upper wall of the rectangular groove.

The insulating block is made of epoxy resin material.

The legs of the bracket are provided with universal wheels.

In the utility model, the spacing between the two rows of wiring blocks on the support is the same as that of the primary leads of the horn-type current transformer, and the wiring blocks in different rows are staggered from each other. Terminals; two terminals on the same junction block are respectively connected to one primary lead wire of different claw-type current transformers, and the other primary lead wires of different claw-type current transformers are respectively connected to a terminal block of another row of adjacent junction blocks; In this way, the primary sides of a plurality of claw-type current transformers can be connected in series conveniently, which improves the test efficiency. At the same time, the junction block is composed of an insulating block fixed on the bracket and a conductive copper block fixed on the insulating block. Groove and the crimping screw arranged on the upper wall of the rectangular groove; in this way, the electrical connection of the claw-type current transformer is reliable, the contact area is large, and the safety is good during the test.

Description of drawings

Fig. 1 is the front view schematic diagram of a kind of claw type current transformer testing device of the present utility model;

Fig. 2 is a top view schematic diagram of Fig. 1;

Fig. 3 is the right view diagram of Fig. 1;

Fig. 4 is the front schematic diagram of another kind of horn type current transformer testing device of the present utility model;

Figure 5 is a schematic diagram during the test of Figure 4;

Among the figure: 1 is a bracket; 2 is a boundary block; 21 is an insulating block; 22 is a conductive copper block; 3 is a universal wheel.

Detailed ways

With reference to Fig. 1, Fig. 2, Fig. 3, it is a kind of claw type current transformer testing device of the present utility model. Among them, there are two rows of junction blocks 2 on the bracket 1, the row spacing is the same as the distance between the primary leads of the claw-type current transformer, the junction blocks 2 of different rows are staggered from each other, and each junction block 2 is provided with electrical connections. of the two terminals. In this embodiment, in order to save material, a connection block with one connection terminal is provided at both ends of the front row, of course, a connection block with two connection terminals can also be used instead, and the other connection blocks have two connection terminals the junction block.

The junction block includes an insulating block fixed on the bracket and a conductive copper block 22 fixed on the insulating block 21. The above-mentioned fixings are all connected by bolts, as shown in the partial section in Figure 1: the insulating block is made of epoxy resin material Made, step holes are opened on the insulating block, and the bolt heads are sunk in the step holes to realize the insulation of the bolt heads.

With reference to Fig. 4, Fig. 5, it is another kind of claw-type current transformer testing device of the present utility model, and the difference of a kind of claw-type current transformer testing device shown in Fig. 1, Fig. 2, Fig. 3 is: (1 ) The feet of the support 1 are equipped with universal wheels 3, which are convenient for one pass; It consists of crimping screws on the upper wall of the rectangular slot. Connect 12 cleat-horn current transformers LH across the front and rear rows of junction blocks 2 that are staggered left and right to form a series circuit, which is convenient for simultaneously testing 12 cleat-horn current transformers LH at one time.

Claims (4)

1. a claw-type current transformer testing device, is characterized in that, comprises support, is arranged on the front and rear two rows of wiring blocks on the support, row spacing is identical with the spacing of the primary lead of claw-type current transformer, and the wiring blocks of different rows Left and right are staggered mutually, and two connecting terminals for electrical connection are arranged on each connecting block. 2. a kind of claw type current transformer testing device according to claim 1, is characterized in that, described junction block comprises the insulating block that is fixed on the support and the conductive copper block that is fixed on the insulating block, and connecting terminal is opened by The two ends of the conductive copper block are used to place the primary lead wire of the claw-type current transformer, which is composed of an outward-opening rectangular slot and a crimping screw arranged on the upper wall of the rectangular slot. 3. A claw-horn type current transformer testing device according to claim 1, wherein the insulating block is made of epoxy resin material. 4. A claw-horn type current transformer testing device according to claim 1, characterized in that said support feet are provided with universal wheels.

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