Relay protection devices are essential in the transmission and distribution processes.The current sampling of the devices are usually done with current transformers(CT).In case of CT faults induced by terminal wiring loose,in-sulation ageing,or outer skin damage,and human mis-operation,short circuit or open circuit faults of the CT secondary circuit may be caused.Thus,a mis-locking prevention device for fault detection of the CT secondary circuit is devel-oped,which is of a modular design and simple installation,and is suitable for the renovation of most existing protection devices.It can be used in the short circuit fault detection and the neutral wire breakage detection of the CT secondary circuit with various types of microcomputer protection,automation and metering devices.Thus,the faults caused by mis-action of the relay protection devices,human mis-operation and inadequate maintenance quality can be avoided,which provides error tolerance opportunities for the operators.
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