采用“三取二”保护逻辑的分析与应用

Adopt the “Two out of Three” Protection Logic

阐述了"三取二"保护逻辑的基本原理和特点,通过对5种保护逻辑建立数学模型,从可靠性的角度分析了保护逻辑的误动率和拒动率,论证了"三取二"保护逻辑既能防止误动又能防止拒动,具有较高的可靠性和优越性。结合上海奉贤逆变站的实际,以阀短路保护为例,剖析了在不同动作策略下的"三取二"保护逻辑模块所处的位置以及出口方式,证实了无论从可靠性还是经济性考虑,向家坝—上海±800kV特高压直流保护系统采用"三取二"保护逻辑是科学的。

This paper elaborate that ＂two out of three＂ basic principles and characteristics of the protection logic,protection logic malfunction rate by a mathematical model of the five kinds of protection logic,from the reliability point of view,refused to moving rate and reliability ＂ two out of three ＂protection logic can prevent malfunction and prevent tripping,high reliability and superiority.Combined with the Shanghai Fengxian station actual valve short circuit protection,for example,analyze the different action strategies under the ＂two out of three＂ to protect the position of the logic module and export,confirmed by the analysis from the point of view of reliability,or from the the point of view of the economy Xiangjiaba-Shanghai ± 800 kV UHVDC protection system using the ＂two out of three＂ protection logic of science,to ensure the safe and stable operation,and the hidden danger of UHV converter Station.