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Patent

Ground-fault interrupter

Hasegawa Kiyoshi
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TLDR
In this paper, a temperature detector 61 to detect temperature is installed on a zero-phase current transformer and compared with a set temperature established beforehand, when the detected temperature exceeds the set temperature, the ground-fault interrupter 1 is cut off by a temperature monitoring circuit 6 which gives a tripping signal to a tripped device 5, thereby, abnormal overheating of the zero phase current transformer 3 is prevented.
Abstract: 
PROBLEM TO BE SOLVED: To provide a ground-fault interrupter applying high frequency leakage current measures which can prevent insulation deterioration and occurrence of disconnection of detecting winding of a zero-phase current transformer due to abnormal overheating of the zero-phase current transformer caused by high frequency leakage current. SOLUTION: In the ground-fault interrupter 1 applying high frequency leakage current measures, a temperature detector 61 to detect temperature is installed on a zero-phase current transformer 3. Then, the detected temperature of this temperature detector 61 and a set temperature established beforehand is compared. When the detected temperature exceeds the set temperature, the ground-fault interrupter 1 is cut off by a temperature monitoring circuit 6 which gives a tripping signal to a tripping device 5, thereby, abnormal overheating of the zero-phase current transformer 3 is prevented. COPYRIGHT: (C)2008,JPO&INPIT

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