Method and device for real time on line detection of metering current mulual inductor malfunction

The invented device is composed of a high-frequency excitation module, a signal coupling module, a signal sampling module, a signal processing module, a fault diagnostic module, a fault state output module, a power source module, a timing module, a fault state recording module, a fault state display module and a network communication module. Comparing with the prior art, the invented method provides the advantages of high accuracy, the good performance in real-time and strong capability on-line for detecting the fault of the metric current transformer.