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Development of distributed relaying processor with digital filtering of fast sampled data

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5 Author(s)
Chiba, T. ; Hitachi Ltd., Ibaraki, Japan ; Kudo, H. ; Kido, M. ; Kawai, T.
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In order to cope with advanced relaying techniques, a multimicroprocessor-based digital relay was developed. The main features are distributed processing among five processors, 32-b floating-point operations, digital filtering of fast sampled data, and a personal computer based testing tool. Performance tests of this digital relay showed the following characteristics: (1) the error of any relaying element (distance, overcurrent and undervoltage) was less than 1%; (2) operating time was less than 20 ms when the processing interval was 1.67 ms; and (3) a single relaying processor had a computational capacity of six-phase (ground, short×4 steps×3 phases) distance relays based on differential equations, accompanying elements, and a self-diagnosis function in every processing interval

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Power Delivery, IEEE Transactions on  (Volume:5 ,  Issue: 3 )