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.
UHVDCDC protection system"Two out of three" protection logicMalfunction rateRefuse to move rates
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