LEAKAGE CURRENT RELAY WHICH CAN CHANGE HIGH FREQUENCY NOISE BAND

摘要

PROBLEM TO BE SOLVED: To solve the problem that existing leakage current relays make errors as the inverters are widely adopted in the load facilities which use induction motors, following the development of the inverters causing high frequency noise increase and lowered high frequency noise bands. SOLUTION: In preparation for future system changes, connection terminals are provided for the leakage current relay in advance to connect another capacitor to change the capacitance of the filter capacitor as the high frequency noise increases or its band is lowered when another inverter is added or the number of the inverters is increased in the future.