Multifunction realization of active electronic current transformer
In order to fit for the urgent requirement of the digital substation, the research of electronic current transformer (ECT) attracts more and more attention. The multifunction of ECT is especially studied in order to expand its application range. In this paper, a type of active ECT is introduced firstly. The redundant backup design of high-voltage circuit is presented after that. It will be greatly helpful for the improvement of stability and reliability of active ECT. The multifunction of lowvoltage side circuit is also discussed carefully. The local display, harmonic analysis and remote communication between ECT and master computer are all designed and realized. Therefore, the application field of active ECT will be expanded significantly. The validities of above circuits are all illustrated in Lab at last.
Analysis on Reliability of Electronic Current Transformer Based on Failure Modes,Effects Analysis and Fault Tree Analysis
Reliability analysis is the key procedure during the development of electronic current transformer (ECT). On the basis of the contrastive analysis on reliability of electromagnetic current transformers, by means of failure modes and effects analysis (FMEA) as well as fault tree analysis (FTA) the reliability of a kind of electronic current transformer is researched, and perfect worksheets of both FMEA and FTA are established. All of minimum cut sets of fault trees are found out and the qualitative analysis on the reliability of the ECT is conducted. The effectiveness of the presented reliability analysis method is verified by the results of the analysis on two practical examples during the development and test process of the ECT.
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