IEC 60255-12 Ed. 1.0現行
Electrical relays Part 12: Directional relays and power relays with two input energizing quantities
出版：International Electrotechnical Committee
專家解讀視頻
Specifies performance requirements for the subfamily as shown in the title. This publication forms part of a series dealing with measuring relays with more than one input energizing quantity and for which IEC 60255-6 gives the general requirements.
SS IEC 255:1991 - Identical
UNE 21136-12:1990 - Identical
SS IEC 60255-12 Ed. 1 (1998) - Identical
PN IEC 255-12:1994 - Identical
BS 142-4-4.2:1984 - Similar
VDE 0435-302:1988 - Similar
