Switched and Polyphase Distance Relays
The early time-distance schemes had the merit of simplicity. Since the operating time was proportional to the distance of the fault from the relay only one relay was necessary per phase, but the clearing time was high for faults near the end of the protected section (fig. 6.1). The stepped time-distance scheme was introduced in Canada in 1925 by Paul Ackerman. It had the advantage of reducing the overall clearing time by the shaded areas in fig. 6.1 and is now universally used.
KeywordsFault Detector Phase Comparator Protective Relay Ground Fault Zero Sequence
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