Electrical priciple assignment

[freddo]

You give me extra work ???????
I turn off my laptop now

I need to use this line on my boss.

 

[Julie.]

For my EF colleagues: In #1 Q4a the question asks the candidate to work out the magnitude of the neutral current in an unbalanced 3 phase 4 wire unbalanced system.

Could those that have been to college recently and used phasors and the geometrical method tell me whether the candidate is expected to show on his/her phasor diagram that In is in antiphase to L1 + L2 + L3? (cf Kirchoff's first law).

Or are the examiners content that the resultant current phasor L1 + L2 + L3 has been constructed geometrically correctly?

Can't answer directly, but the question asks for magnitude, so I would assume the phasor is merely used for the analysis, the magnitude itself would be identical for the neutral and phase addition.

 

[Zaprinski]

You have set yourself up for another question! I thought we agreed we both needed a break

If In is actually (and it is) in antiphase to L1 + L2 + L3 draw the phasor for it on your last diagram that you sent me.

I nearly done half assignment.???

 

[DPG]

Nice one Zaprinski.

 

[Zaprinski]

Nice one Zaprinski.

No worries mate , But if people still think I’m lazy or I wanna just copying paste , this not me.?????
I’m always working hard , And listening everyone, some lads here take on ---- .
Made good things, make people happy , one day , everything should back to you .

 

[marconi]

For the amusement of all those EF members wanting something to think about:

Look at the OPs paper and Q4a. An unbalanced set of currents. How could you simplify this phasor diagram to two phasors straightaway? And then find the resultant of these two? Post your work

 

[Zaprinski]

For the amusement of all those EF members wanting something to think

 

[SparkyChick]

Look at the OPs paper and Q4a. An unbalanced set of currents. How could you simplify this phasor diagram to two phasors straightaway? And then find the resultant of these two? Post your work

I believe you can use SOHCAHTOA (specifically CAH) to combine two that would greatly simplify the diagram, and the numbers are nice too. I'm thinking L2 and L3.

 

[Zaprinski]

I believe you can use SOHCAHTOA (specifically CAH) to combine two that would greatly simplify the diagram, and the numbers are nice too. I'm thinking L2 and L3.

??? Good answer mate .

 

[Baddegg]

For the amusement of all those EF members wanting something to think about:

Look at the OPs paper and Q4a. An unbalanced set of currents. How could you simplify this phasor diagram to two phasors straightaway? And then find the resultant of these two? Post your work

After giving the question ALOT of consideration I’ve come to the conclusion that I’d probably beg and plead with yourself and or @Lucien Nunes for help ?