CN205450042U - Experimental switching operation platform of power transformer - Google Patents

Abstract

The utility model discloses a power transformer test switching operation platform, which comprises a box body, and the upper insulating plate of the box body is provided with a test side high winding connection terminal, a test side middle winding connection terminal and a test The low winding terminal on the test side, the high winding terminal on the test side, the medium winding terminal on the test side and the low winding terminal on the test side are each connected to a short-circuit knife switch, and the short-circuit knife switch is connected to the grounding knife switch; the box body The side insulation plate of the transformer is provided with the transformer side high winding terminal, transformer side medium winding terminal and transformer side correspondingly connected to the test side high winding terminal, test side medium winding terminal and test side low winding terminal for connecting the transformer. Side low winding terminal; set the ground terminal to connect with the shell of the box and the ground knife switch. The utility model has the advantages of simple structure, convenient operation, safety and reliability, high efficiency and low cost, and can meet field test and safety requirements.

Description

Power transformer test transfer operation platform

technical field

The utility model relates to an auxiliary device for a power transformer test in the electric power field, in particular to a transfer operation platform for auxiliary power transformer tests.

Background technique

With the continuous development of the scale of the power grid, the power grid has put forward higher requirements for the safety of equipment, and the pre-test and regular inspection work that has always been carried out is also particularly important. Among them, the pre-test work of power transformers is more important and frequent. Especially in recent years, the expansion of the power grid has caused the number of transformers to increase day by day. Electrical testers will face unprecedented test workload. How to improve work efficiency, shorten test time, and ensure that equipment detection is in place and other issues It has become a topic of great concern to electrical test workers.

The traditional transformer test needs to artificially short-circuit the winding lead-out wires on each side of the transformer or lead them to the ground test instrument. The winding is suspended in the air; and when performing the transformer insulation test, the tested winding needs to be short-circuited, and the non-tested winding is short-circuited to ground. When changing the wiring mode of such a simple test item, the tester needs to climb up the bushing to remove the original test line, and then short-circuit each winding in turn, which not only increases the workload and working time of the tester, but also increases the number of repetitions. The safety risks of climbing are especially obvious when the transformer test with 110kV and above or the transformer needs repeated tests.

Utility model content

The technical problem to be solved by the utility model is to overcome the above-mentioned defects and provide a power transformer test switching operation platform, which can complete the basic test of the transformer after one connection, effectively reducing the workload and safety risks of the test personnel It is of great significance for the equipment maintenance unit to carry out the test work.

In order to solve the above-mentioned technical problems, the power transformer test transfer operation platform described in the utility model includes a box body, and the upper insulating plate of the box body is provided with a test side high winding terminal for connecting a test instrument, a test side The middle winding connection terminal and the test side low winding connection terminal, the test side high winding connection terminal, the test side middle winding connection terminal and the test side low winding connection terminal are each connected to a short-circuit knife switch, and the short-circuit knife switch and the grounding knife switch connection; the side insulation plate of the box body is provided with transformer side high winding terminal, transformer side The middle winding connection terminal and the transformer side low winding connection terminal; the grounding terminal is provided to connect with the shell of the box body and the grounding knife switch.

The utility model is proposed on the basis of improving the test method and improving the work efficiency. The power transformer test switching operation platform includes three groups of high, medium and low terminals connected to the test instrument side, and the corresponding high, medium and low terminals connected to the transformer side. , Three sets of low terminals, three winding short-circuit switches and three grounding switches. When it is necessary to short-circuit each side of the transformer, it is enough to close the corresponding short-circuit knife switch. There is no need for the staff to climb up the bushing and use bare copper wires to short-circuit. In addition, this device can also be used for insulation test and dielectric loss test, which brings great convenience to test personnel.

Beneficial effects of the utility model: due to the use of the above-mentioned structure, the utility model has the advantages of simple structure, convenient operation, safety and reliability, etc., and its function can meet the field test and safety requirements. Compared with the traditional wiring method, the work efficiency is improved , the time-consuming is significantly reduced, and the operating device basically achieves the expected effect.

Description of drawings

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

detailed description

Below in conjunction with accompanying drawing, the utility model is described in further detail.

The power transformer test switching operation platform described in the utility model includes a box body 1, and the upper insulating plate 8 of the box body 1 is provided with a test side high winding connection terminal 5 and a test side middle winding connection terminal for connecting the test instrument. 6 and the test side low winding connection terminal 7, the test side high winding connection terminal 5, the test side middle winding connection terminal 6 and the test side low winding connection terminal 7 are each connected to a short circuit switch 2, the short circuit switch 2 and The grounding knife switch 3 is connected; the side insulation plate 9 of the box body 1 is provided with a corresponding connection with the high winding terminal 5 on the test side, the middle winding terminal 6 on the test side and the low winding terminal 7 on the test side for connecting the transformer. The transformer side high winding terminal 10, the transformer side middle winding terminal 11 and the transformer side low winding terminal 12; the grounding terminal 4 is provided to connect with the casing of the box 1 and the grounding knife switch 3.

Embodiment: The power transformer test switching operation platform described in the utility model has an insulating plate, a short-circuit knife switch and a grounding knife switch as the core structure of the box body. The insulating plate adopts epoxy resin with relatively high dielectric strength currently on the market board, the breakdown voltage in the parallel layer direction reaches more than 35kV, and the vertical layer direction electric strength reaches more than 16.1 megavolts per meter, which ensures that the measured insulation truly reflects the transformer insulation, and is also sufficient to withstand the 10kV voltage applied in the dielectric loss test; the short circuit knife Gate 2 is made of 63A traditional three-phase switch, which has sufficient margin for carrying short-circuit current; the grounding switch 3 is made of special single-pole single-throw, which ensures the reliability of short-circuit grounding.

The utility model is used in conjunction with the transformer test instrument, and the test instrument, such as a DC resistance tester, an insulation resistance tester, a dielectric loss tester, etc., is connected to the high winding terminal 5 on the test side, the middle winding terminal 6 on the test side and the test side On the low winding terminal 7, correspondingly, the windings on the three sides of the transformer are respectively connected to the high winding terminal 10 on the transformer side, the middle winding terminal 11 on the transformer side and the low winding terminal 12 on the transformer side, and the grounding terminal 4 is connected to the box shell, The three grounding knife switches are connected, and the grounding operation is realized whenever one of the grounding knife switches is closed. When conducting the insulation test between the high voltage side of the transformer and the medium voltage side, low voltage side and ground, close the short-circuit switch 2 on the high-voltage side, disconnect the grounding switch 3 on the high-voltage side, and close the short-circuit switch 2 on the medium-voltage side. Close the grounding switch 3 on the medium-voltage side, close the short-circuiting switch 2 on the low-voltage side, close the grounding switch 3 on the low-voltage side, and ground the grounding terminal 4, and clamp the test line of the insulation test meter to the short-circuiting switch on the high-voltage side 2 for insulation testing. In addition, the utility model can also be used for insulation test and dielectric loss test, which brings great convenience to test personnel.

By adopting the power transformer test switching operation platform described in the utility model, the test personnel can complete the change of the corresponding test wiring mode on the ground, which saves the process of the test personnel climbing up the transformer bushing to change the test line or short-circuit the winding back and forth, which improves the efficiency of the test. It improves work efficiency, saves time, reduces workload, and reduces the safety risks of repeated climbing. It has high application value for carrying out power transformer tests.

Claims (1)

1. a power transformer test switch over operation platform, including casing (1), it is characterized in that, winding connection terminal (6) and test side low winding connection terminal (7) in test side height winding connection terminal (5) for connecting test instrument, test side it is provided with on the above insulation board (8) of described casing (1), in described test side height winding connection terminal (5), test side, winding connection terminal (6) and test side low winding connection terminal (7) respectively connect a short-circuit disconnecting link (2), and described short circuit disconnecting link (2) is connected with grounding switch (3)；Be provided with on the side insulation plate (9) of described casing (1) for connection transformer with winding connection terminal (6) in test side height winding connection terminal (5), test side and test winding connection terminal (11) and transformer side low winding connection terminal (12) in transformer side height winding connection terminal (10) of side low winding connection terminal (7) corresponding connection, transformer side；Arrange ground terminal (4) to be connected with shell, the grounding switch (3) of described casing (1).