IEC 60255-127:2010 specifies minimum requirements for over/under voltage relays. The standard includes specification of the protection function, measurement characteristics and time delay characteristics.
IEC 60255-127 Ed. 1.0 b:2010
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Measuring relays and protection equipment – Part 127: Functional requirements for over/under voltage protection
International Electrotechnical Commission , 04/27/2010
Pages: 49
