CN204142947U - Secondary terminals shorting stub is used in mutual inductor test - Google Patents

Abstract

The utility model discloses a secondary terminal short circuit for transformer testing, which is characterized in that the short circuit comprises a terminal block (1) with a plurality of parallel insertion holes (101); a plurality of clamps ( 3), the handle end of the wire clip is provided with a plug hole; and a plurality of connecting wires (2), both ends of the connecting wires are provided with a terminal head (201), and one end of the terminal head (201) is connected to the terminal block ( 1) is connected to the plug hole (101), and the other end terminal head (201) is detachably electrically connected to the plug hole of the wire clamp (3). The utility model has a simple structure, is easy to carry, and is convenient to use, and is suitable for secondary terminals of various specifications, and can achieve reliable short-circuiting.

Description

Secondary terminal short circuit for transformer test

technical field

The utility model relates to electrical equipment, in particular to a secondary terminal short circuit for transformer testing

Background technique

Transformers are mainly divided into current transformers and voltage transformers, which operate in large numbers in power systems and are in working condition for a long time. The main function of the transformer is to provide stable and reliable standard secondary current or voltage for electric energy metering, relay protection, automatic control and other devices. Its working reliability is of great significance to the safe operation of the entire power system. In many test items of current transformers and voltage transformers (such as insulation resistance test, dielectric loss factor test, etc.), it is required to short-circuit or short-circuit the secondary terminals to ground. According to many years of practice, thin bare copper wires are generally used as short wire. However, due to the large differences in the design of the secondary winding terminals of different manufacturers and different types of transformers, for some dry-type transformers with a voltage level of 35kV and below, due to the small space in the secondary winding terminal box, screw-type design is adopted. The short-circuiting of the secondary terminals is time-consuming and laborious, and the work efficiency on site is not high. the

Taking several common current transformers as examples, the average time it takes to short-circuit the secondary terminals of the current transformer with bare copper wires is shown in Table 1. the

Table 1 Statistical table of short-circuit time of dry-type rheological secondary terminals

It can be seen from the above table that it takes a long time to short-circuit the secondary terminals of the transformer with bare copper wires, especially for dry-type transformers, it usually takes eight minutes or even longer to short-circuit the secondary terminals. Especially in the test of overhauling the dry-type current transformer in the switchgear, due to the narrow space of the switchgear, it takes longer and more laborious to short the secondary terminals of the transformer. the

In addition, after a period of use, bare copper wires tend to loosen and break strands, forming burrs on the surface, which can easily hurt the hands of workers. the

Utility model content

In order to avoid the deficiencies of the prior art, the utility model provides a transformer test secondary terminal with simple structure, easy to carry, convenient to use, suitable for secondary terminals of various specifications, and capable of reliable short-circuiting. The secondary terminals are short-circuited. the

The utility model solves the technical problem and adopts the following technical solutions:

The secondary terminal short circuit for transformer test has a structural feature that the short circuit includes

A terminal block with multiple parallel socket holes;

a plurality of wire clamps, the handle end of the wire clamps is provided with insertion and extraction holes; and

A plurality of connecting wires, both ends of the connecting wires are provided with terminal heads, one end of which is connected to the insertion hole of the terminal block, and the other end of the terminal head is detachably electrically connected to the insertion hole of the wire clamp. the

The structural features of the utility model also lie in:

The multiple connecting wires are of different lengths. the

The wire clip is a sharp-nosed alligator clip. the

The ground end of the terminal block is provided with a clamp. the

Compared with the prior art, the beneficial effect of the utility model is shown in Fig. 2 . the

Description of drawings

Fig. 1 is the structural representation of the utility model. the

Fig. 2 is a beneficial effect diagram of the utility model. the

Labels in the figure: 1 terminal block, 101 socket hole, 2 connection wire, 201 terminal post head, 3 wire clamp. the

The technical scheme of the utility model will be further explained and illustrated through specific embodiments below in conjunction with the accompanying drawings. the

Detailed ways

As shown in Figure 1, the secondary terminal short circuit for the transformer test comprises a terminal block 1 with a plurality of parallel insertion holes 101; The end of the clamp handle is provided with a plug-in hole; and a plurality of connecting wires 2 of different lengths. Both ends of the connecting wires are provided with a terminal head 201, one end of the terminal head 201 is connected to the socket hole 101 of the terminal block 1, and the other end is connected The stud 201 is detachably electrically connected to the insertion hole of the clamp 3 . At the same time, a wire clamp 3 is provided at the ground end of the terminal block. the

In this embodiment, a standard current test line is used. The cross-sectional area of the copper core of the connecting line is 2.5 square millimeters, and the maximum safe working current exceeds 10A. the

For specific applications, we counted the number of secondary terminals of commonly used transformers, as shown in Table 2. the

Table 2 Statistical table of the number of transformer secondary terminals

As shown in Table 2, the number of secondary terminals of most transformers is between 6 and 10, so the short circuit designed by the utility model adopts 10 test connectors. the

After field tests, we found that the secondary terminals of the electric transformer can be firmly short-circuited and grounded by using the secondary terminal short circuit for the transformer experiment, and the overall effect is very good. the

Also take several current transformers before the activity as an example, use the secondary terminal short-circuit wire used in the transformer experiment to short-circuit the secondary terminals of the current transformer, each type of current transformer is short-circuited twice, and the average time spent 34 Statistical table of short-circuit time of short-circuit wires of this utility model

It can be seen from Table 3 that the time for short-circuiting dry-type rheology with the secondary terminal of the utility model is greatly reduced, and the 8 minutes and 27 seconds required for short-circuiting the secondary terminal with bare copper wires are reduced to 47.1 seconds. Greatly improved labor efficiency. the

Claims (4)

1. secondary terminals shorting stub is used in mutual inductor test, and it is characterized in that, described shorting stub comprises

One junction block (1) with multiple block form spliced eye (101);

Multiple wire clamp (3), described wire clamp handle end is provided with plug hole; And

Many connecting lines (2), described connecting line two ends are equipped with wiring column cap (201), wherein one end wiring column cap (201) is connected with the spliced eye (101) of junction block (1), and other end wiring column cap (201) is detachably electrically connected with the plug hole of wire clamp (3).

2. mutual inductor test secondary terminals according to claim 1 shorting stub, is characterized in that, described many connecting lines (2) are different in size.

3. mutual inductor test secondary terminals according to claim 1 shorting stub, is characterized in that, described wire clamp (3) is sharp mouth crocodile clip.

4. mutual inductor test secondary terminals according to claim 1 shorting stub, is characterized in that, the earth terminal of described junction block is provided with wire clamp (3).