Answer / pratheesh

We can calculate the total output current of a 300kva ups.

P=√3*V*I*CosΦ
Where P= Output power of UPS here 300000VA
V= Output voltage of UPS ( I hope this is a 3 phase
415 volts UPS)
I= Output current. (We need to calculate)
CosΦ= Powerfactor of the load. Varies depends the
nature of load(Inductive, Resistive or
Capacitive. We can assume this value is as 1
because we dont know the powerfactor, nature of
load.

So I= P/(√3*V*CosΦ)
= 300000/(1.73*415*1)=Approximately 420A per phase(if
the load distribution is balanced on each phase)


So, If the UPS runs on 40 to 45 percent load, it will take
around 170 to 190 Amps on each phase.

Answer / thowsif_emerson_csm team

For 300 KVA the Full load Current=KVA*PF,
i.e 300x.8=240000 Watts.

we know in 3 Phase Circuits,

P=1.732x V x I x Pf,

I=P/1.732xV x Pf,

I=240000/1.732 X 440 X 0.8,

Full Load Current, I =240000/609=394 Amps,

The Load Current @ 40% is 394*.40=158 A(Total Load Current).

The Load Current @ 45% is 394*.45=177 A(Total Load Current).


So load current at 40% Load is 39*.40=15.6 A/Phase Amps.

Answer / panindra polayadi

p=vI
where p for poore
v for vada
I for idippu
when we apply 40 to 45% load entteammo poore will blast
at that time vada will reduce idippu will be constant it is
newton,s fourth law after somedays newton,s fifth law will
be come beware

Answer / sathishbabu t

same 40 to 45 % of full load current

hi this toufik here. i am doing my b.e.degree.now i am in final year and supposed to do a project in this year so i thinking to control the buchholz relay using software base means checking the status of transformer oil using microcontroler, plc or scada. so can i do so...??? alz suggest me...

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