CN106771394A - A kind of power transformer test mode of connection - Google Patents

Abstract

The invention relates to the technical field of power transformer testing, and specifically discloses a power transformer test wiring method. The power transformer is a 110kV or 220kV transformer. For the power transformer test project, select the corresponding test line for the test instrument, and electrically connect it to the output end of the test transfer line; Replacement; the test adapter wire has a certain length so that its connection end is located at the ground test instrument. The method of the present invention can reduce the number of disconnection and disconnection of the power transformer test on the transformer side, reduce the difficulty of disconnecting and changing the test line between different test items, and is easy to operate, improves the test efficiency, shortens the test time, reduces the number of times of test personnel's climbing operations, and reduces personnel labor. Strength, effectively reducing the risk of personal injury and electric shock.

Description

A kind of power transformer test wiring method

technical field

The invention relates to the technical field of power transformer testing.

Background technique

Power transformers are critical electrical equipment that require calibration and verification before use or at specified intervals. According to the "National Grid Transformer Test Standard", the 110kV or 220kV transformer field test items include DC resistance, dielectric loss, insulation resistance, transformation ratio, on-load switch and other test items. Each test item needs to use a special test according to the requirements of the test equipment. Connect the test line to the transformer according to the corresponding test line connection structure. Due to the large size of the transformer and the high position of the test wiring, each test item requires the tester to go up and down the transformer to replace the corresponding test line and change the connection structure of the test line. It takes several hours to test a whole set of test items on a power transformer. , the labor intensity of personnel is high, and the risk of falling during multiple climbing operations is high, and the test efficiency is low.

Contents of the invention

The technical problem to be solved by the present invention is to provide a power transformer test wiring method, which can reduce the number of times of power transformer test disconnection on the transformer side, reduce the difficulty of disconnecting and changing test lines between different test items, facilitate operation, and improve test efficiency. Shorten the test time, reduce the number of times the test personnel climb high, reduce the labor intensity of the personnel, and effectively reduce the risk of personnel falling and electric shock.

In order to solve the above technical problems, the technical solution adopted by the present invention is: a power transformer test wiring method, the power transformer is a 110kV or 220kV transformer, the method includes: first use the access terminal of the test adapter wire and the The power transformer is electrically connected, and then the corresponding test instrument test line is selected according to the test items of the power transformer, and it is electrically connected with the output terminal of the test transfer line; Disconnect and replace the outlet end of the above-mentioned test adapter cable;

The test adapter wire has a certain length so that its connection end is located at the ground test instrument; the insulation strength of the outer insulation of the test adapter wire is greater than or equal to 10kV.

In an embodiment of the method of the present invention, the access end of the test adapter wire is a test clip, and is clamped and fixed to the terminal of the power transformer by the test clip to realize electrical connection; the test adapter wire The outlet end is provided with a plug and/or a socket, and is fixed with the test instrument with a test line connector through the plug and/or socket to realize electrical connection.

Preferably, the test adapter wire contains at least two mutually insulated core wires, and each core wire is provided with a separate plug and/or socket at the outgoing end.

There are four test transfer wires, which are respectively used to connect with the A phase, B phase, C phase and N phase of the high voltage side of the power transformer to be tested; the test transfer wires contain two mutually insulated core wires.

In another embodiment of the method of the present invention, a junction box is provided at the connecting end of the test transfer wire, and a connection terminal with a switch is arranged in the junction box, and the test transfer wire is connected to the test instrument through the connection terminal. The test leads make electrical connections.

Preferably, the length of the test patch cord is 5-8 meters.

The beneficial effects produced by adopting the above-mentioned technical solution are: the method of the present invention can reduce the number of disconnection and connection times of the power transformer test on the transformer side, reduce the difficulty of disconnection and conversion of test lines between different test items, facilitate operation, improve test efficiency, and shorten test time , reduce the number of times the test personnel climb high, reduce the labor intensity of the personnel, and effectively reduce the risk of personnel falling and electric shock.

detailed description

The invention provides a power transformer test wiring method, which is suitable for 110kV or 220kV power transformer tests. The method includes: first connecting the access terminal of the test transfer wire to the power transformer, and then selecting corresponding test instruments according to the test items of the power transformer Use the test line to electrically connect it to the output end of the test transfer line; when replacing the test line for the test instrument for different power transformer test items, disconnect and replace it at the output end of the test transfer line;

The test adapter wire has a certain length, so that its connection end is located at the ground test instrument.

Use soft copper wire cables for the test transfer wires. The insulation strength of the outer insulation of the test adapter wire is greater than or equal to 10kV.

The method of the present invention adopts the test adapter wire, and the test personnel only need to connect at high altitude once, and then disconnect and connect the outlet end of the test adapter wire with the test line of different test instruments to complete the DC resistance, dielectric loss, insulation resistance, Transformation ratio, on-load switch and other test work reduce the risk of high fall, shorten the transformer test time, improve work efficiency and reduce labor intensity.

As a specific embodiment of the method of the present invention, the access end of the test adapter wire is a test clip, and is clamped and fixed on the terminal of the power transformer by the test clip to realize electrical connection; the outlet end of the test adapter wire is provided with a plug And/or socket, and through the plug and/or socket and the test instrument are fixed with the test line connector to realize electrical connection.

Single-core cables can be selected for test transfer wires, and a sufficient number of test transfer wires are used to connect with the high-voltage side of the transformer and the test wires for the test instrument according to the needs of the test project.

As a further improvement, the test adapter wire contains at least two mutually insulated core wires, and each core wire is provided with a separate plug and/or socket at the outgoing end. There are four test transfer wires, which are respectively used to connect with the A phase, B phase, C phase and N phase of the high voltage side of the power transformer to be tested; the test transfer wire contains two mutually insulated core wires.

As another embodiment of the method of the present invention, the difference from the previous specific embodiment is that a junction box is provided at the outlet end of the test transfer wire, and a connection terminal with a switch is arranged in the junction box, and the test transfer wire passes through the connection terminal. It is electrically connected to the test instrument with a test line.

Preferably, for a 110kV power transformer, the length of the test transfer wire is not less than 5 meters, and for a 220kV power transformer, the length of the test transfer wire is not less than 8 meters.

The present invention has been described in detail above, and the implementation of the present invention has been set forth using specific examples in the present invention. The description of the above embodiments is only used to help understand the present invention. It should be pointed out that for those skilled in the art, On the premise of not departing from the principles of the present invention, some improvements can also be made to the present invention, and these improvements also fall within the protection scope of the claims of the present invention.

Claims (6)

1. A power transformer test wiring method, the power transformer is a 110kV or 220kV transformer, characterized in that the method comprises: first electrically connecting the access end of the test adapter wire with the power transformer, and then according to the power transformer Select the corresponding test line for the test instrument for the test item, and electrically connect it to the outlet end of the test adapter line; when changing the test line for the test instrument for different power transformer test items, perform Disassembly and replacement; The test adapter wire has a certain length, so that its connecting end is located at the ground test instrument; The insulation strength of the outer insulation of the test adapter wire is greater than or equal to 10kV. 2. The power transformer test wiring method according to claim 1, characterized in that the access end of the test adapter wire is a test clip, and is clamped and fixed to the terminal of the power transformer by the test clip to realize Electrical connection; the outlet end of the test adapter wire is provided with a plug and/or socket, and is fixed with the test instrument with a test line connector through the plug and/or socket to realize electrical connection. 3. The power transformer test wiring method according to claim 2, characterized in that the test adapter wire contains at least two mutually insulated core wires, and each core wire is provided with a separate plug and/or or socket. 4. power transformer test wiring method according to claim 3, is characterized in that described test adapter wire is four, is respectively used to be connected with A phase, B phase, C phase and N phase of high voltage side of power transformer to be tested; The test adapter wire contains two mutually insulated core wires. 5. The power transformer test wiring method according to claim 1, characterized in that a junction box is provided at the outlet end of the test transfer wire, and a terminal with a switch is arranged in the junction box, and the test transfer wire passes through The connecting terminal is electrically connected with the test line used for the test instrument. 6. The power transformer test wiring method according to claim 1, characterized in that the length of the test adapter wire is 5-8 meters.