Simple type Igr earth leakage detector

摘要

PROBLEM TO BE SOLVED: To facilitate the work of leak detection by placing a simple type Igr leak detector via cramp CT to a low voltage path placed with an Igr (leak current) detector of own receiving equipment and the like. SOLUTION: A simple type Igr leak detector 20 detecting leak by fixing a cramp CT (coupling transformer) 8 to a low voltage path or a branch circuit and using different frequency components overlapping via a CT for overlapping attenuate the commercial frequency component with a commercial frequency removing filter circuit 23, transmits and indicates signal on a display 27 by way of a band-pass filter circuit 24 for overlapping and rectification-gain control circuit 26. Then, the circuit constitution of the device is simplified so that a device in one with the cramp CT can be constituted.