Generator set for emergency starting of high-voltage large-capacity motor and starting method

Abstract

The invention discloses a generator set for emergency starting of a high-voltage large-capacity motor. The generator set comprises a generator set body and the large-capacity motor connected with the same, a control switch is arranged between the generator set body and the large-capacity motor, an intelligent control cabinet for controlling rotating speed and voltage of the generator set body is arranged on the generator set body, an output end of the intelligent control cabinet is connected with an input end of the control switch, and the intelligent control cabinet is used for controlling switching off and switching off of the control switch. The control switch is arranged between the generator set body and the large-capacity motor, and the intelligent control cabinet is arranged to control the generator set body and the control switch, so that the large-capacity motor can be started as required, a soft starter or a frequency converter need not to be provided for the whole starting process, equipment input is reduced by 40% on the basis of starting by the soft starter or starting by the frequency converter, and capacity of a diesel engine generator set used in the generator set is only 1.2-1.5 times of that of the large-capacity motor.

Description

technical field [0001] The invention relates to the field of emergency power generation power systems, in particular to a generator set for emergency starting of a high-voltage large-capacity motor, and a method for starting a large-capacity motor by using the generator set. Background technique [0002] With the development of economy, the scale of metallurgy, coal, chemical industry and other industries and the continuous increase of stand-alone capacity, the proportion of high-voltage (3 ~ 10kv) large-capacity motors in industrial production is increasing. For high-voltage and large-capacity motors, the starting methods mostly adopt the following methods: full-voltage direct starting, auto-coupling decompression starting, y-δ starting, soft starter starting, and frequency converter starting. [0003] Among them, soft starter start and frequency converter start are the two most commonly used starting methods for high-voltage and large-capacity motors. [0004] The soft st...

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Problems solved by technology

[0004] The soft starter is selected to start the high-voltage large-capacity motor, and the required starting current is 2 to 3 times the rated current. For the mains power network, the starting current of the high-voltage large-capacity motor has no effect when starting, but for For the diesel generator set used for emergency start, if the starting current is too large, it will cause the diesel generator set used for emergency start to stop. ~3 times, which not only increases the manufacturing cost of the generator set, but also increases the footprint of the generator set

[0005] However, the inverter is used to start the high-voltage large-capacity motor. Although the starting current is small, the equipment cost is relatively large.

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