| This paper research on the protection &control system of the mini turbine in steam-drive water pump of heat power unit. In the condition of fully knowing about the structure and operation character of the water pump, and the original state of protection & control system of the mini turbine, to give the concentrated analysis and research about the character of programming logic controller. PLC is used as core to substitute for relay. PLC has the highly stability and the superiority of the quick arithmetic speed. It will complete the complex logic that cannot format and the function that cannot fulfill by the normal relay. It also has the function of communication, and it can inter-connect with other systems, and to share the information with each other.The successful rebuild to the steam-drive water pump and protection & control system of the 3#,4# unit in Zhang Jia Kou Power Plant. This new system is practical and advance.
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