Answer Posted / puneet kumar

negative phase sequence is equally in magnitude, placed
apart 120 degree, rotate in oppsite direction to the
direction of phase sequence (RYB).
It is happen generally when load is
incresed, speed is reduce for some time then there is
happening of opposition of phase sequence due to increse of
load. (relative...)

a)In a 3-phase 4-wire circuit, a circuit breaker is selected to protect the circuit whose highest fault level is 6.6 MVA. Determine the required minimum breaking capacity in kA. (Note: Covert 3-phase power in terms of kA to find answer.) b)Using the below, determine the required minimum making capacity in kA as a “peak value”. Rate breaking capacity (Icn) ka: Icn<= 1.5 Factor = 1.41 1.5

1749

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