Transformer switching-on impulse current suppression device and method

Abstract

The invention relates to the field of transformer safe operation protection, particularly to a transformer switching-on impulse current suppression device and method, and aims to solve the technical problem that the size of a high-voltage cabinet is increased due to the adoption of a high-voltage resistor because the impact current at the closing moment of an existing transformer is large. The transformer switching-on impulse current suppression device comprises a vacuum circuit breaker K2, a three-way voltage regulator T1, a high-voltage current-limiting resistor R and a vacuum circuit breaker K3 which are sequentially connected in series between a vacuum circuit breaker K and the primary side of a transformer T2, and further comprises a vacuum circuit breaker K1, wherein one end of the K1 is connected to the end, connected with the K, of the K2, and the other end of the K1 is connected with the primary side of the T2. According to the device, the impact current of the transformer at the moment of closing can be greatly reduced to be close to the no-load current value of the transformer, and the influence of the impact current is eliminated; and a transformer loop is slightly changed, a high-voltage cabinet and a transformer do not need to be modified, only cable connection needs to be conducted, and operation is easy.

Description

technical field [0001] The invention relates to the field of transformer safe operation protection, in particular to a transformer closing surge current suppression device and method. Background technique [0002] Large-capacity power transformers, rectifier transformers, and special transformers will generate a large inrush current at the moment of closing. The peak value of the inrush current can reach 5 to 20 times the rated current of the transformer. This current will cause frequent tripping of the front-end switch of the transformer. Especially in large-scale motor test stations and converter test stations, due to the needs of test projects, transformers will be frequently switched on and off, and the impact current of transformers has a greater impact on test work. [0003] In the prior art, a high-voltage resistor is connected in series at the front end of the transformer, and the resistor is used to accelerate the attenuation time of the surge current of the transfo...

AI Technical Summary

Problems solved by technology

[0005] 1) This technology can only reduce the inrush current at the moment of transformer closing, but the reduction rate is not very large. In some places where the inrush current needs to be basically eliminated, it cannot meet the use requirements

[0006] 2) This technology generally increases the high-voltage resistance in the high-voltage cabinet at the front end of the transformer and sets it in one of the three-phase voltage circuits. Since it is a high-voltage resistor, there are strict requirements on insulation, which will cause a large increase in the volume of the high-voltage cabinet

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