A new detection technique for distance protection during power swings

This paper presents a new detection technique based on the derivative of the line reactive power as seen by the relay to prevent distance relay mal-operation during power swings. This proposed technique overcomes the shortcoming of conventional power swing detector (PSD) by removing the pre-defined R-X diagram. The conventional PSD has the difficulty in obtaining the timer setting at pre-defined R-X diagram due to varying cycle of power swings. To illustrate the effectiveness of the proposed detector, the studies has been conducted on the IEEE 39 bus test system using the PSS/E software. The results show the effectiveness of the proposed detection technique to distinguish the fault, fault clearance and power swing in order to activate the correct relay trip signals during power swing.

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