METHOD FOR CONTROL OF ELECTRIC MOTORS OF PUMP UNITS OF WATER SUPPLY STATION

摘要

A method for control of electric motors of pump units of a water supply station includes measurement of water head at outlet of the main pump. One compares measured head to set values with minimization of deflection of measured head from set value. At decrease of current value of head at outlet one simultaneously switches the motor of the main pump directly to electric network. One sets the level of voltage of frequency transformer needed for stabilization of head at set level. At increase of current value of head at outlet the output of the frequency transformer is switched to the motor of the main pump unit. One sets the level of voltage frequency needed for normalization of water head.