The functions and work principal of the control and protection system of steam turbine power generation unit are introduced. The original hydraulic control system was transformed into digital electro-hydraulic system (DEH), greatly improving the stability of the unit.%介绍了发电厂汽轮机组保安调节系统的功能与原理，将原来液压式调节系统改造为数字式电液调节系统（DEH），使机组的稳定性大幅提高。
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