Ground fault detector

Details Ground fault detector Ground fault detector

H - Electricity

04

M

379/2, 324/58.4

H04M 3/08 (2006.01) H04M 3/30 (2006.01) H04M 19/00 (2006.01)

Patent

CA 2025014

ABSTRACT In a ground fault detector for long distance sub- scriber lines accommodated in a small capacity digital electronic exchange, a DC/DC converter for power supply is stopped during detection of ground fault. Upon reception of the stop signal, the DC/DC converter con- verts the power supply voltage for the subscribers to a voltage as the system power supply of the exchange, namely to a low voltage before voltage conversion of the DC/DC converter. The battery feed circuit can maintain the alarm condition, even if a current flows continuously to the battery feed resistor due to a ground fault, until the ground fault is re recovered by the maintenance person without breaking the resistor. - 15 -

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