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Soft start circuit for switch transformer motor

A switching transformer and soft-start circuit technology, applied in the electrical field, can solve the problems of large impact from the power grid, low precision, and short life

Inactive Publication Date: 2017-08-18
ANHUI JIUNENG INFORMATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing motor soft start circuit has technical problems such as large impact from the power grid, low precision, and short life.

Method used

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  • Soft start circuit for switch transformer motor

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Embodiment Construction

[0009] The content of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0010] A structure diagram of a switching transformer motor soft start circuit is shown in figure 1 As shown, a motor soft start circuit of a switching transformer is characterized in that: the high-voltage power supply bus 1 leads to two output terminal lines, which are respectively connected to the bypass circuit breaker KA2 and the starting circuit breaker KB3, and the output terminal lines of the starting circuit breaker KB3 are sequentially It is connected with the primary side of the switching transformer 4 and one end of the current transformer 5, the other end of the current transformer 5 is connected with the motor 8, and the output terminal of the bypass circuit breaker KA2 is connected between the primary side of the switching transformer 4 and the current transformer 5 , an excitation power supply 6 is connected in se...

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Abstract

The invention relates to a motor soft start circuit for a switching transformer, which belongs to the field of electrical technology, and is characterized in that two output terminal lines are drawn out from the high-voltage power supply bus bar, which are respectively connected with the bypass circuit breaker KA and the start circuit breaker KB, and the start circuit breaker KB The output terminal line is connected to the primary side of the switching transformer and one end of the current transformer in turn, the other end of the current transformer is connected to the motor, the primary side of the switching transformer and the current transformer are connected to the output terminal of the bypass circuit breaker KA, and the switching transformer An excitation power supply is connected in series on the secondary side of the excitation power supply, and the output end of the excitation power supply is connected with one end of the PLC controller. The soft start circuit designed by the invention can solve the technical problems of the existing soft start circuit technology such as large impact by the power grid, low precision and short service life.

Description

technical field [0001] The invention relates to the field of electric technology, in particular to a motor soft start circuit of a switching transformer. Background technique [0002] In recent years, the production capacity of many industries has increased, and the drive motors of their production equipment have also increased. For example, in the steel and chemical industries, more and more motors above 10,000kW have been used. The low-voltage motor soft start device has been used in many applications now. It adjusts the terminal voltage of the motor by adjusting the conduction angle of the positive and negative parallel thyristors, so that the motor terminal voltage gradually rises to achieve the function of soft start. It limits the motor's The starting current (generally below 3 times the rated current) reduces the impact on the power grid, improves the life of the motor and mechanical equipment, reduces downtime, and improves production efficiency. [0003] The soft s...

Claims

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Application Information

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IPC IPC(8): H02P1/16
CPCH02P1/16
Inventor 姚和中
Owner ANHUI JIUNENG INFORMATION TECH
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