Metering of symmetrical components

Methods of metering the positive and negative sequence power and energy in 3-phase 3-wire systems, and positive, negative, and zero sequence power and energy in 3-phase 4-wire systems, are discussed in this article. It is presented not because it contains a wealth of new material, but because it deals comprehensively with the problem, in a way different from that which has prevailed in earlier published material, and because it is clear, specific, and readily understandable, confining itself strictly to the problem of metering of symmetrical components.