Answer Posted / 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.

I am getting above 60 V as open delta voltage against single phase unit ICT at tertiary delta formed and ICT getting trippped on NDR. ICT tested and found in order. PTs provided on tertiary are tested and in order. what may be the reason?

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