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The Large current transformer (GTA)core of the work status will change as stray magnetic fields generated by external current, so that GTA generate additional errors, the accuracy decrease, and even lead to core of GTA saturation or failure.The paper based on the model of equivalent circuit and magnetic model, the error mechanism of external current infulence is analyzed, and the current transformer...
the electronic transformer is one of key equipments in the rapid developing smart substation of power systems. In this paper, the key application problems of the electronic transformer in the developing smart substation are summarized according to the application status in China. In order to guarantee the safe and reliable performance of the electronic instrument transformers in power system, on-site...
So far, there has not been any method that is both effective and accurate enough to test the performance of a heavy current transformer (HCT) under electromagnetic interference from adjacent bus-bars since the primary and adjacent currents are too high to reproduce in a laboratory. A new testing method termed as the “multiple-coil testing method” is presented in this paper to overcome this difficulty...
To equivalently test the shielding effect of heavy current transformer (HCT) with shielding coils in laboratory, an eccentric bus-bar testing method has been used to simultaneously simulate the effect of the primary bus-bar and adjacent bus-bar since 1970s. But still there hasn't been an effective way to determine the crucial parameters, especially the eccentric distance, which means the distance...
In order to reduce the interference from stray flux of adjacent bus bars on the error of heavy current transformer (HCT) which always has a large diameter, the interference mechanism was investigated theoretically in details based on magnetic circuit. It was concluded that there were mainly two interference ways that the stray flux affected the error of HCT, and then it was further verified by experiments...
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