A real short one:

If a 3 phase load is calculated at 85kW, with a power factor of 0.87, calculate the apparent power (kVA) and the line current per phase (A/ph).

Help would be much appreciated.

 

I was thinking:

arccos(0.87)=29.54°
cos(29.54)=85/(apparent power)

apparent power = 97.7kVA

Not sure how to get line current per phase

 

Why not then simply write ...

Apparent Power = (Real Power) / (Power Factor)

You can't find the line current(s) unless you know the line or phase voltages.