Electromagnetic voltage regulation device for soft start-up of high voltage AC motor

Abstract

The related electromagnetic voltage device for soft startup of high-voltage ac motor comprises: an electromagnetic voltage regulator, which includes a high-voltage ac winding connected with motor winding in series, a middle/low voltage control winding and a thyristor assembly to form a closed loop to control output current of the high-voltage winding for motor soft startup or stop; a fiber isolation transmission system; a digital trigger; a computer fuzzy control system; and peripheral devices (keyboard and display). This invention has well startup property and reliability, and convenient to assemble and maintenance.

Description

Technical field [0001] The invention belongs to the technical field of motor soft start, and relates to a soft start electromagnetic voltage regulating device for high-voltage AC motors, especially suitable for realizing smooth soft start or soft stop of high-voltage cage-type asynchronous motors with a voltage level of 10KV and below and a power of 50,000KW and below control. Background technique [0002] At present, known soft starters for high-voltage AC motors include series reactance step-down starting, magnetron reactance step-down starting, AC variable frequency starting, and liquid resistance starting. Series reactance step-down starting method, the starting current is large and cannot be adjusted, and the soft stop function cannot be realized; the magnetically controlled reactance step-down start can adjust the starting current and realize the soft stop function, but the installation site requires a large-capacity power supply, which increases the project investment...

AI Technical Summary

Problems solved by technology

Series reactance step-down starting method, the starting current is large and cannot be adjusted, and the soft stop function cannot be realized; the magnetically controlled reactance step-down start can adjust the starting current and realize the soft stop function, but the installation site requires a large-capacity power supply, which increases the project investment. And bring difficulties to the site construction; AC frequency conversion starting is an efficient starting speed regulation method, with good starting performance, large speed regulation range, and good energy-saving effect, but it is expensive and the localization rate is low. It is mainly produced and imported from abroad. The technology is complex and requires a relatively high maintenance level, which is not suitable for starting domestic high-voltage motor units; liquid resistance starting can be controlled steplessly, has good starting performance, and is cheap, but the liquid resistance tank has a large volume, takes up a lot of space, and needs regular water replenishment, so it is not necessary Suitable for icy or bumpy occasions, difficult to manufacture, transport and install, and limited in use

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