LOW PRESSURE DISTRIBUTION SYSTEM PROTECTIVE APPARATUS IN HIGH MAGNETIC FIELD ENVIRONMENT AND METHOD OF SELECTING PROTECTIVE DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a simple protective apparatus having a control protective device for controlling and protecting a wiring protective device of a low pressure distribution system which normally operates even in a high magnetic field environment or a load even if the protective device is not magnetically shielded. SOLUTION: The low pressure distribution system protective apparatus in the high magnetic field environment of 160 gauses or more includes a high magnetic field application fuse 4, a high magnetic field application switch 5 and a high magnetic field application thermal relay 6 provided on a distribution line. The high magnetic field application fuse 4 stretches elements which have a silver ribbon or a single metal in an insulating cylinder and is constituted by fully filling the circumstances with an extinguishing sand. The high magnetic field application switch 5 is made a solid-state contactor. The high magnetic field application thermal relay 6 is taken as a configuration which makes moving parts other than a bimetal nonmagnetic substance. COPYRIGHT: (C)2005,JPO&NCIPI