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A new principle for high resistance earth fault detection during fast power swings for distance protection

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2 Author(s)
Mechraoui, A. ; Dept. of Electr. & Electron. Eng., Nottingham Univ., UK ; Thomas, D.W.P.

The combined effects of a high impedance ground fault condition and a fast power swing condition cause the apparent impedance `seen' by power system distance protection schemes to vary over a wide range. Previous research work has shown that the detection and location of high impedance faults during power swings is very difficult. A new principle for high impedance fault detection during fast power swings is presented which overcomes these deficiencies. This method forms a part of a complete power swing relaying scheme and can be implemented on standard relaying hardware. Results are presented based on extensive simulation studies carried out on a typical 400 kV transmission system, using the Electromagnetic Transient program (EMTP)

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Power Delivery, IEEE Transactions on  (Volume:12 ,  Issue: 4 )