IS 3842 : Part 7 : 1972 Application guide for electrical relays for ac systems: Part 7 Frequency relays

1. Scope

1.1 This guide ( Part VII ) deals with the application of frequency relays covered. by IS: 3231-1965*.

1.2 It does not cover frequency relays used for:

a) regulating frequency of emergency generating sets, portable diesel or petrol generating sets, etc; and

b) field swi tching and synchronizing of synchronous machines.