a: Complete reliability; due to the continue trend of interconnection and increased capacity of generating stations switch gears need to be more reliable to secure the circuits during faults.
b: Quick operation; in the instances of faults on part of a system the gear has to quickly operate so that no damage is done to the generators.
c:Absolutely certain discrimination; when a fault occurs on part of the system the gear must discriminate the faulty sections and the healthy sections.
Malumu answered the question on October 23, 2018 at 17:00
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