Determining the order of succession for a 3-phase current

Question

On some exams the following question appeared that I am not capable of answering:

How to determine the order of succession of the 3 phases of a 3-phase power using as a load either: a) 2 lamps and 1 coil or b) 2 lamps and 1 capacitor.

I guess it has to do with the different kind of load a lamp and a coil or capacitor are but I am not sure how to use them to achieve the desired output.

Can someone think of a way to accomplish this task?

The current phase shift will tell which is the coil phase lag and cap phase lead by monitoring current and voltage — Tony Stewart EE75, Jun 05 '21 at 21:21

score 7 · Accepted Answer · answered Jun 05 '21 at 21:33

7

Two lamps and a capacitor (or inductor) can do the job: -

Inductor version: -

The maths is quite easy to follow; it's all about the phase shift produced by the capacitor (or inductor) and how it changes the voltage seen across each lamp.

Images (and explanation) from this site.

answered Jun 05 '21 at 21:33

Andy aka

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Huh. Never seen this before. Very interesting. – user57037 Jun 05 '21 at 22:33

Determining the order of succession for a 3-phase current

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