IS: 3231 (Part 2/Sec. 1) - 1987; Specification for electrical relays for power system protection Part 2 requirements for principal families Sec. 1 all-or-nothing relays

IS: 3231 (Part 2/Sec. 1) - 1987; Specification for electrical relays for power system protection Part 2 requirements for principal families Sec. 1 all-or-nothing relays - New Delhi BIS 1988 - 25p

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