IS: 3231 (Part 3/Sec. 2) - 1987 (Reaffirmed 1992); Specification for electrical relays for power system protection Part 3 requirements for particular group of relays Section 2 dependent specified time measuring relays
IS: 3231 (Part 3/Sec. 2) - 1987 (Reaffirmed 1992); Specification for electrical relays for power system protection Part 3 requirements for particular group of relays Section 2 dependent specified time measuring relays
- New Delhi BIS 1987
- 11p
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