A new digital filter directional relay technique using active/reactive power portrait |
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| Affiliation: | 1. School of Electrical Engineering, Wuhan University, Wuhan 430072, China;2. Beijing Electric Power Research Institute, Beijing 100075, China;1. Hunan Provincial Key Laboratory of Smart Grids Operation and Control, Changsha University of Science and Technology, Changsha, China;2. College of Electrical and Information Engineering, Hunan University, Changsha, China |
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| Abstract: | The present paper discusses some conventional directional relay drawbacks, which are based on the relationship between voltage and current, in order to determine fault direction. In addition, it presents a new fault detection technique based on instantaneous active and reactive energy that is measured and analysed at the relaying point. This energy has a distinct characteristic which is used to distinguish the fault direction. The suggested relay has determined the fault direction in a rather short time after fault occurrence, even in 2–5 ms, depending on the characteristics of the fault generated travelling waves. The algorithm used in this method has been modified in order to improve the performance of the relay. Simulation studies showed that the directional relay based on this new technique has fast speed operation with reliability and dependability. |
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