DETECTION AND RELAYING OF OPEN CIRCUIT FAULTS IN TRANSMISSION LINES

Abstract

In N.V. arid a.H.V. transmission lines the relaying and faults location play; great r011 in the further rectors. tion of supply. Fault clearing is often the most effective and most economical way of improving the stability limit, with rapid fault clearing the conductor is hardly damaged and the lane can be put back into service immediately. Circuit breakers alone do not suffice to clear faults, they must be suppli entad by protective relays. The relays are. ; required to detect the ox stance of faults and , if one does exist, to determine hich breaker should be opened to clear it. To 1solata fault with least interuptlon to service, only the faulted circuit and. no other should be disconnected. This requires the. use of velar v+ h All select correctly the circuit breaker that should be opened. Por relaying, the modern trend is toward s static relays. It is only with the advent of modern semiconductor* that appreciable progress has been made towards the static relays.. The increasing performance required of protection is reaching the limits of cspb&lity of electromechanical, relays Practical development of static protection with higher pew formianoe and greater potentisUty Is becoming increasingly necessary.