With the development of society and the progress of science and technology, the period of equipment renewal is becoming shorter and shorter. Based on this background, many electrical control systems which use traditional relay switch as the main part in the electric power industry suffer from failure due to frequent start-up, corrosion and aging of relay switch. With the development of PLC (programmable controller) technology, on the one hand, it continues to develop simple, low-cost, ultra small products, on the other hand, it turns to the development of large, multi-functional, serial, standardized and intelligent products. In this paper, a part of PLC (programmable controller) in power plant control (automatic control of oil immersed transformer cooling system) is selected for research, based on Siemens PLC The new control system with its expansion module as the core, supplemented by solid-state relay, switch, contactor and other components is reformed for the original transformer cooler control system, which eliminates the design deficiencies and defects in the original control system, greatly simplifies the system wiring, improves the reliability and automation of the installation, realizes a variety of operation control modes, and ensures the cooling of the main transformer Safe operation of the.<br>
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