IS: 3231 (Part 3/Sec. 4) - 1987 (Reaffirmed 1992); Specification for electrical relays for power system protection Part 3 requirements for particular group of relays Sec.4 directional relays and power relays

IS: 3231 (Part 3/Sec. 4) - 1987 (Reaffirmed 1992); Specification for electrical relays for power system protection Part 3 requirements for particular group of relays Sec.4 directional relays and power relays - New Delhi BIS 1987 - 19p

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