Soft starting device and method for high-power transformer

Abstract

The invention discloses a soft starting device and method for a high-power transformer. The soft starting device for the high-power transformer comprises a current limiting module, a control module, a first switch module and a second switch module, wherein the current limiting module is connected between a mains supply and the high-power transformer and used for limiting starting current of the high-power transformer; the control module is used for generating first control singles when the high-power transformer performs soft starting and generating second control singles when the high-power transformer performs soft starting to power frequency; the first switch module is connected between the current limiting module and the high-power transformer, is connected according to the first control singles, and is disconnected according to the second control singles; and the second switch module is in parallel connection with the current limiting module, is disconnected according to the first switch module, and is connected according to the second control singles. Disconnection and connection of the first switch module and the second switch module are controlled through the control module, so that the high-power transformer is started smoothly under the conditions of current limiting, and automatic switching between power frequency power supply and frequency conversion power supply of the high-power transformer is further achieved.

Description

technical field [0001] The invention relates to the field of transformers, in particular to a soft start device and method for a high-power transformer. Background technique [0002] In the start-up of high-power transformers, if the power frequency power supply is used to start directly, the starting current is too large, and the fuse or circuit breaker will trip. [0003] At present, the soft start device of high-power transformer adopts the method of series current limiting resistor to limit the starting current, so as to achieve the purpose of smooth starting. Such as figure 1 As shown, the high-power transformer soft-start device includes a circuit breaker QF, an AC contactor KB1, and a current-limiting resistor R. The circuit breaker QF is connected to the mains, the AC contactor KB1 is connected between the circuit breaker QF and the high-power transformer T, and the current-limiting resistor R is connected in series between the circuit breaker QF and the high-power...

AI Technical Summary

Problems solved by technology

[0004] Although figure 1 The soft start device shown in the figure can achieve the purpose of smooth start of the high-power transformer to a certain extent, but the AC contactor KB1 needs to be controlled manually, which may cause misoperation and affect the normal power supply of the high-power transformer

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