Hrvoje Mikic-Herceg - Electrotechnical Institute "RADE KONCAR" ZAGREB , Yugoslavia

In the article is described the device for automatic isolation of faulty power line. It is described the principle of operation of the said device if permanent short circuit occurs on the line and in case of transient failure eliminated by automatic reclosure of the circuit breaker. The article also coitaines basic characteristics of two types of device - Combination of device and disconnector - Combination of device and disconnecting switch