PURPOSE: To automatically switch to other power source without power interruption only by disconnecting a power distribution line from one power source by providing a semiconductor anti-parallel circuit, a momentary voltage drop detector, a gate controller, and connecting this uninterruptive power switching device between the line and the other power source.
CONSTITUTION: A thyristor anti-parallel circuit 1 connected in parallel with a series switch Q, a switch 2 connected in series with the circuit 1, a momentary voltage drop detector 3 for detecting a voltage drop of a zone BR to be switched to output a gate ON command, and a thyristor gate controller 5 for controlling to close or open the circuit 1 upon reception of gate ON, gate OFF command and manual or remote ON/OFF command, etc., are provided. The zone switch of a switching connecting point is closed, further an uninterruptive power switching device is opened, and removed from the line to complete switching.
BABA MASAYUKI
NAKAMURA TORU
KATAOKA YASUO
MEIDENSHA ELECTRIC MFG CO LTD
| JPS6024145B2 | 1985-06-11 | |||
| JPS60133616A | 1985-07-16 |