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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I hv a question regarding power factor improvement just after transformer. I request you to reply me plzz. thank you sir. My friend has a small unit of fabrication. in his factory the main load is a welding machine, lathe machine, grinding machine. this load is not continuous type. now our electricity board has installed 16 KVA, 11000/433 V transformer for our factory. In the energy meter (trivector meter) at LV side of transformer, i hv seen power factor value of 0.15 only when only 3 KW load was flowing. Further electricity board has suggested to install 4 KVAR capacitor at LV side after energy meter. Now my question is that if we permanantly install and switch on 4 KVAR capacitor after energy meter, during some load on transformer and also without any load on transformer, wht will be the power factor shown in energy meter?i dont want to get any penalty by electricity board, so plz suggest me if i can permanantly install and switch on the 4 kvar capacitor or not at LV side of transformer just after energy meter? Thank you again and awaiting for ur positive reply soon.

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