The cooler control cabinet of the main transformer is the auxiliary equipment of the main transformer,and the automatic control principle is that the temperature and load signals are controlled by relays.This paper introduces a new type of main transformer cooler control cabinet,which adopts a micro-control unit(programmable controller)as the main control core device,a touch screen as the human-computer interaction interface,an AC contactor or a contactless switch(soft starter)as the power execution element,and a circuit breaker,a thermal relay and phase sequence missing relay as protection elements.By changing the cooler control cabinet of the main transformer,the reliability of safe operation of the unit equipment is greatly improved,and the fault expansion caused by the cooler control cabinet of the main transformer is eliminated.At the same time,the reliability of safe operation of the power plant unit is improved to meet the economic requirements of the unit.
Main transformer cooler control cabinetAutomatic controlProgrammable controllerMain control core device
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