Power stoppage minimizing systems for distribution lines and methods of

Abstract

A power stoppage minimizing system for a distribution line and a method of using a distribution line minimize a power stoppage section and a power stoppage time when a short circuit occurs in the distribution line, and employs a first and a second distribution line each connected through a circuit breaker to a corresponding bus and each having switches in position thereon; a normally open tie point switchgear provided between adjacent ends of the first and second distribution lines; a protective relay for opening, when a short circuit has occurred, the circuit breaker a fixed time after the occurrence of the short circuit on the first distribution line; a first unit for opening a switch on the side of a power source and nearest a point where the short circuit has occurred; a second unit for opening, after the switch is opened by the first unit, a switch on the side of a load nearest the switch opened by the first unit; and a third unit for closing the tie point switchgear after the opening of the switch by the second unit, the opening of the switch by the first unit being made within a fixed interval of time for the protective relay. Thus, the short circuit section is located and the switches before and after the short circuit section are opened. The tie point switchgear is then closed to thereby minimize the power stoppage section and time when the short circuit has occurred.