1st Edition, January 1, 1980
Electrical Relays Part 12: Directional Relays and Power Relays with Two Input Energizing Quantities
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Description / Abstract:
This standard specifies the performance requirements of directional relays and power relays with two input energizing quantities, which constitute a particular sub-family of measuring relays with more than one input energizing quantity as defined in IEC Publication 255-6, Electrical Relays, Part 6: Measuring Relays with More than One Input Energizing Quantity, and the parameters whose values are to be declared by the manufacturer of such relays. It also specifies methods of presenting the characteristics and performance of these relays.