Faster fault clearing improves power system angle stability, increases the amount of power that can be transferred, reduces stress on transformers and generators, and improves safety.
Most of today’s protection principles are based on the fundamental frequency components of voltages and currents. It takes one cycle of filtering to accurately measure the fundamental frequency quantities. Because of this, the speed of phasor-based protection principles is limited to about one power cycle.
Time-domain protection principles use transient information of voltages and currents to dramatically reduce transmission relay tripping times. In this webinar, the presenter will review a number of time-domain protection techniques, including directional elements, direct-tripping underreaching elements, and differential elements, that significantly speed up line protection.
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