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The monitoring of current is great significance to evaluate the running state of electrical equipments. In this paper, a portable high-precision online current detection system is presented, and a current sensor is designed which can be opened-closed conveniently. The current sensors have the same frame structure and size, but the number of turns is different. Coils with fewer turns are used to measure...
Since electronic voltage transformers (EVTs) based on IEC 61850-9-2 are widely used in the substations, especially in the automating substations, their calibration becomes very important. Generally, the calibration of EVTs needs for the power to be interrupted and causes power outage, and also the faults of the running transformers cannot be found in time. For this reason, an online calibration system...
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