IS: 3231 (Part3/Sec.3) - 1987 (Reaffirmed 1992); Specification for electrical relays for power system protection Part 3 requirement for particular group of relays Section 3 Biased (percentage) differential realys

IS: 3231 (Part3/Sec.3) - 1987 (Reaffirmed 1992); Specification for electrical relays for power system protection Part 3 requirement for particular group of relays Section 3 Biased (percentage) differential realys - New Delhi BIS 1987 - 16p

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