IS 3842 Pt.1-1967

标准号：IS 3842 Pt.1-1967
发布日期：1967/12/1 12:00:00
实施日期：1999/12/31 12:00:00
适用范围：1.1 This guide deals with the application of overcurrent relays for ac systems, covered by IS : 3231-1965* for feeders and transformers. It covers both directional and non-directional overcurrent relays and their application for phase faults, earth faults, restricted earth faults and core-balance earth-fault protection. It also covers time-current characteristics and considerations for the setting and co-ordination of overcurrent (non-directional) relays.1.2 This guide does not cover:a) the principles of system design and system protection,b) direct acting overcurrent devices, andc) static relays.