CN209069965U - DC Resistance Test of Transformer rapid wiring device - Google Patents

Abstract

The utility model relates to a quick connection device for transformer direct current resistance test. Corresponding to the voltage terminal and current terminal of the neutral point, the terminal of the test instrument corresponds to the terminal of the transformer; the transfer switch is 4 and includes the connection state and the grounding state, and one side of each transfer switch is connected to the voltage terminal and current of the transformer. Binding post, the other end of each transfer switch is connected to the test instrument binding post and the grounding terminal respectively through the connection state and the grounding state. The utility model has reasonable design, realizes the fast testing function of phase resistance and line resistance in the direct current resistance test, avoids frequent disconnection work, improves the test efficiency, ensures the accuracy of the test results, and has the advantages of concise structure, safety and reliability. , easy to use, flexible operation and so on.

Description

Transformer DC resistance test quick wiring device

technical field

The utility model belongs to the technical field of transformer testing, in particular to a quick connection device for a DC resistance test of a transformer.

Background technique

DC resistance measurement is an extremely important item in the transformer test. Through the measurement, it is possible to check whether the conductive circuit of the equipment has defects such as poor contact, poor welding, coil failure and wiring errors. For large transformers with tap changers on the high-voltage side, during the DC resistance test, it is necessary to continuously perform wiring operations between the three-phase and neutral points, which not only consumes a lot of time, but also has potential safety hazards due to frequent high-altitude operations. , Due to the excessive operation of disconnecting the wiring, it is easy to cause poor contact of the clip, which affects the accuracy and comparability of the test results under different tap-changer positions.

Utility model content

The purpose of the utility model is to overcome the deficiencies of the prior art, and to provide a quick wiring device for a DC resistance test of a transformer, which solves the problems of complicated wiring operations, low safety and reliability, and poor accuracy.

The utility model solves its technical problems by adopting the following technical solutions:

A quick connection device for transformer DC resistance test, including transformer terminal, transfer switch, test instrument terminal and ground terminal, the transformer terminal is high, medium and low three-phase terminal and voltage terminal of neutral point , the current terminal, the terminal of the test instrument corresponds to the terminal of the transformer; the transfer switches are 4 and include the connection state and the grounding state, one side of each switch is connected to the voltage terminal and the current terminal of the transformer, and each switch The other end of the switch is connected to the test instrument terminal and the ground terminal respectively through the connection state and the ground state.

The transformer terminal, the test instrument terminal and the ground terminal are all insulating terminals.

The transformer terminal and the transfer switch, the transfer switch and the test instrument terminal and the ground terminal are all connected by insulated wires.

The advantages and positive effects of the present utility model are:

The utility model adopts four changeover switches to be connected with the transformer and the test instrument respectively, so as to realize the fast test function of the phase resistance and the line resistance in the DC resistance test, especially for the transformer with the tap changer, the advantages are more obvious, and the frequent disassembly is avoided. The wiring work improves the test efficiency and ensures the accuracy of the test results. It has the advantages of simple structure, safety and reliability, convenient use and flexible operation.

Description of drawings

Fig. 1 is the circuit principle diagram of the present utility model.

Detailed ways

The present utility model will be described in further detail below in conjunction with the accompanying drawings.

A quick connection device for transformer DC resistance test, as shown in Figure 1, includes a transformer terminal, a transfer switch, a test instrument terminal, a ground terminal G and an insulated wire. The transformer terminals are 8 and are used to connect the transformer. The 8 transformer terminals are respectively high, medium and low three-phase terminals and voltage terminals and current terminals of the neutral point. And the voltage and current input and output measurement in the neutral point connection and DC resistance test are designed. There are 8 terminals of the test instrument for connecting the test instrument, and the 8 terminals of the test instrument correspond to the terminals of the transformer. The grounding terminal G is connected to the grounding position of the transfer switch to realize the grounding function, which can fully discharge the winding after the DC resistance test of the transformer. The transfer switches are 4 and are used to realize the conversion of the test mode. Each transfer switch includes a connection state (the switch is at position a) and a grounding state (the switch is at position b), and one side of each transfer switch is connected to the transformer voltage terminal. and the current terminal, the other end of each transfer switch is connected to the terminal of the test instrument and the ground terminal G, when the switch is in position a, the switch is connected to the terminal of the test instrument, and when the switch is in position b, the switch is connected to the ground wire Post G, for example, when the transfer switch A is in position a, the transformer terminal U2-A is connected to the test instrument terminal U1-A, and the transformer terminal I2-A is connected to the test instrument terminal I1-A. When the transfer switch A is in position b, the transformer terminal U2-A and the transformer terminal I2-A are connected to the ground terminal G. Transfer switches B and C are the same. The insulated wire is used to realize the internal connection of the conversion device, such as the connection between the transformer terminal and the switch, the connection between the switch and the test instrument terminal and the ground terminal.

All the above terminals are designed to be insulated to ensure that no short circuit occurs during the DC resistance test.

The following takes the high-voltage side test of a three-phase transformer as an example for description, and the high-voltage side of the transformer is a YN type.

(1) All transfer switches of the quick wiring device of the present utility model are in the b position and keep the grounding state. Ground the ground terminal G to ensure that the transformer is fully discharged.

(2) Connect the clips of the 4 groups of DC resistance test wires to the three-phase terminal and neutral point of the transformer respectively, and connect the voltage and current wires to the transformer terminals of the quick connection device respectively.

(3) Take the high-voltage phase A direct resistance test as an example, connect the DC resistance tester to the test equipment terminals U1-A, I1-A and U1-N, I1-N, and all transfer switches are switched to the connection position a. The test can then be carried out. After the test, put the transfer switches A and N to the grounding position to ensure that the transformer is fully discharged.

(4) In the same way, the high-voltage B-phase, C-phase and line-to-line resistance can be realized through the connection between the transfer switch and the test instrument and the terminal post of the test instrument.

It should be emphasized that the embodiments described in the present utility model are illustrative rather than restrictive, so the present utility model includes but is not limited to the embodiments described in the specific implementation manner. Other embodiments derived from the novel technical solution also belong to the protection scope of the present invention.

Claims (3)

1. a transformer direct current resistance test quick wiring device, it is characterized in that: comprise transformer terminal, transfer switch, test instrument terminal and ground terminal, described transformer terminal is high, middle, low three-phase line end and middle The voltage terminal and current terminal of the neutral point, the terminal of the test instrument corresponds to the terminal of the transformer; the transfer switches are 4 and include the connection state and the ground state, and one side of each transfer switch is connected to the voltage terminal of the transformer and the current Binding post, the other end of each transfer switch is connected to the test instrument binding post and the grounding terminal respectively through the connection state and the grounding state. 2 . The quick connection device for transformer DC resistance test according to claim 1 , wherein the transformer terminal, the test instrument terminal and the ground terminal are all insulating terminals. 3 . 3. The transformer direct current resistance test quick wiring device according to claim 1 is characterized in that: between the transformer terminal and the transfer switch, between the transfer switch and the test instrument terminal and the ground terminal, all are connected through insulated wires. connect.