LINE PROTECTION OPERATE TIME: SPEED VS. CIRCUIT BREAKER WEAR, POWER SYSTEM STABILITY AND SECURITY

The improvements in power system stability and power transfer capability have been the main drivers for achieving faster transmission line protection. The decades of advancements of protection devices (from electromechanical to modern numerical relays) have allowed a significant reduction in protection operate time, from tens of milliseconds down to almost zero.

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Author: Mike Kockott, OD Naidu, Sinisa Zubić, Zoran Gajić

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