Answer / nur.asidik

you need to consider of breaking capacity too

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.

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

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0 Answers  

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