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Soft starting device and method for high-power transformer

A transformer and high-power technology, applied in the field of high-power transformer soft-start devices, can solve the problems affecting the normal power supply and misoperation of high-power transformers, and achieve the effect of avoiding excessive starting current, avoiding overcurrent, and realizing automatic switching.

Inactive Publication Date: 2013-04-10
EMERSON NETWORK POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Soft starting device and method for high-power transformer

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Embodiment Construction

[0035] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0036] refer to figure 2 , the present invention proposes a structural schematic diagram of an embodiment of a high-power transformer soft start device. The high-power transformer soft start device includes a current limiting module 10 , a control module 11 , a first switch module 12 and a second switch module 13 . in:

[0037] The current limiting module 10 is connected between the mains 15 and the high-power transformer 14 , and is used to limit the start-up current of the high-power transformer 14 . In one embodiment of the present invention, the current limiting module 10 includes three groups of resistors, which are respectively connected to the three-phase m...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M5/16
Inventor 赵大帅张荣华赵旭波孙建强胡少轶崔志洋胡志远蹇龙飞刘杰张洁琼
Owner EMERSON NETWORK POWER CO LTD
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