Patent ID: 8310210
Filing Date: 2012-11-13
Classification: G01R,H02H

Abstract:
1. An electric leakage detection circuit comprising: a zero-phase-sequence current transformer outputting a zero-phase current by detecting a ground-fault current; a capacitor; a circuit configured to operate an operation when said zero-phase current exceeds a predetermined positive side threshold value or when said zero-phase current falls below a predetermined negative side threshold value, and to control charge and discharge of said capacitor on the basis of said operation; high potential points; and a first resistor provided between said high potential points and said capacitor, wherein said circuit employs an open collector output, an output terminal of said circuit is connected to a contact provided between said first resistor and said capacitor, one end of said capacitor is connected to said contact, and said capacitor is charged and discharged on the basis of output of said circuit.