2.1 Differential protection (ANSI 87L)2.1.1 Principle and current transformerconnectionThe differential protection function of the 7SD600recognizes short-circuits in the protection rangeby comparing the summation currents detected atboth ends of the line. In order to do this, the secondary phase currents from the primary currenttransformers are fed with variable weighting(number of windings) into the summation current transformer which combines them to produce a summation current.
đang được dịch, vui lòng đợi..
