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Answers Please. Electrical Technology.

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1. A load of 2.5kW takes a current of 12 Amp from a 230 Volt supply. Calculate the power factor.


2. Three single phase loads are to be connected to a three phase supply. All at unity power factor. The loads are,


i, 60 Amp.


ii, 50 Amp.


iii, 40 Amp.


By any method determine the neutral current.


Z.
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    Thanks Mike


    On the angle question I originally obtained my answer using a program I wrote some years ago that includes a facility to calculate the parameters of a broken neutral fault (as it stands, just for unity power factor).  This gave me my 330 º.  This is, in fact, correct for a positive phase sequence i.e: L1 @ 0 º, L2 @ 240 º, L3 @ 120 º - anticlockwise rotation which is the normal system in use.


    30 º comes from a negative sequence.


    Regards

    Geoff Blackwell

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  • 0
    Thanks Mike


    On the angle question I originally obtained my answer using a program I wrote some years ago that includes a facility to calculate the parameters of a broken neutral fault (as it stands, just for unity power factor).  This gave me my 330 º.  This is, in fact, correct for a positive phase sequence i.e: L1 @ 0 º, L2 @ 240 º, L3 @ 120 º - anticlockwise rotation which is the normal system in use.


    30 º comes from a negative sequence.


    Regards

    Geoff Blackwell

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