Blower main oil pump switching control circuit, starting-up control method and switching control method

Abstract

The invention discloses a blower main oil pump switching control circuit, a starting-up control method and a switching control method. The control circuit includes a major loop and a control loop connected to the major loop; the major loop includes a low-voltage circuit breaker QF1, a contactor KM, a motor cooling fan, an oil pump motor and a frequency converter; a three-phase four-wire power supply is respectively connected to three upper ports of the low-voltage circuit breaker QF1, and the three lower ports of the low-voltage circuit breaker QF1 are connected to three upper ports of the contactor KM; the three lower ports of the contactor KM are respectively connected to the input end of the frequency converter and the motor cooling fan; and the output end of the frequency converter isconnected to the oil pump motor. Thus, the electric oil pump motor can have longer down time during switching and can be rapidly started up when oil pressure reduces, the restarting up of a unit caused by the unit outage of main / standby oil pumps during switching can be avoided, so that influences on the whole technological system cannot be caused, switching time after the starting-up of the unitis finished can be shortened.

Description

technical field [0001] The invention belongs to the technical field of blower control, and relates to a circuit, in particular to a blower main oil pump switch control circuit and a start-up and switch control method. Background technique [0002] When the steam drag blower is started and debugged, the electric oil pump runs first to lubricate the unit. After the start-up process is completed and the unit is running at full speed, the electric oil pump switches to the main oil pump, and the electric oil pump stops to reduce the power consumption during operation. Loss, and when the low-voltage power supply of the system fails, it will not cause oil cut-off in the process system, so that the reliable and safe operation of key equipment can be effectively protected. The disadvantage is that this method has very high requirements for the smooth switching of the main and standby oil pumps. If the main oil pump cannot be reliably switched to the operating mode during the switchin...

AI Technical Summary

Problems solved by technology

The disadvantage is that this method has very high requirements for the smooth switching of the main and standby oil pumps. If the main oil pump cannot be reliably switched to the operating mode during the switching process, the unit cannot be put into operation normally, and the entire process system will stop running. cause large economic losses

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