Kurzschluß-Schutzschaltung für eine unterbrechungssichere Stromversorgung

摘要

A short-circuit protective circuit for uninterruptible power supply equipment of the type in which in a short-circuit at a branch feeder in a load part, a bypass thyristor switch is operated to connect in a moment directly to a commercial power supply and kept at ON for a short time while an inverter circuit remains operating, and consequently a short-circuit fuse attached to said branch feeder is blown due to energy from the bypass-circuit power supply, and thus power supply to the load continues. According to the invention, in an accident of short-circuit at the load part, the load is connected temporarily to the bypass circuit, and supplied with power through both the inverter circuit and the bypass circuit to rapidly blow the fuse in a short time, and then power supply through only the inverter circuit to the load returns.