formula for incomer breaker size calculation of powerfactor
correction unit
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you need to consider of breaking capacity too
Is This Answer Correct ? | 2 Yes | 0 No |
Answer / matt
Given a system power factor of 0.9, PFC unit of 50kvar we can work out the following
50/0.9 = 56 A real current
56^2 * 50^2 = 75 A apparent current
Cable capacity - 75 * 1.35 = 100 A
Factor of 1.35 used for over rated capacitors as per
industry standards.
Breaker shall be rated at less than the cable capacity but greater than 75A. Increase cable size to suit breaker breaker sizing if required.
Is This Answer Correct ? | 6 Yes | 6 No |
Answer / mohan
Amps Per KVAR is between 1.1 to 1.3 Amps
for a 300KVAR panel
the current shall be 130 AMPs(and if the capacitors are
auto swithced , then switching surges need to be considered
hence) * 1.5 Times = 585Amps
The nearest breaker size is 630AMPS
It is preferable to use Capcitor duty contactor for
switching
Is This Answer Correct ? | 1 Yes | 6 No |
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