representation of three-line diagram for generator

[odlanor]

the designer draws a threeline diagram with the actual position of the sequence of phases of the generator terminals.
V(N),B(N),A(N) => A,B,V
Have you seen this? Is there any drawbacks?
see Annex

 

[rcw retired EE]

The circle diagram on the right looks like the designer is trying to show the physical orientation of the terminals on the generator: Line side terminals on top, neutral side terminals on the lower right. If that is what the diagram is supposed to show, a note saying "as viewed from Collector End" would help. Also need a note indicating the phase sequence assumes "clockwise rotation of generator as viewed from Collector End" would eliminate another source of error if the turbine spins the generator the opposite way.

Showing the phase sequence, the connections and the physical orientation on the generator is very helpful when checking the phasing of the system design and connecting to the bus and transformers.

I have spent a lot of money getting the phasing corrected when these details were missed in design.

 

[odlanor]

rcwilson,
physical orientation of the terminals on the generator is not part of threeline diagram;
sequence phasorial diagram can be part of threeline diagram but I learned that is always counterclockwise.

 

[rcw retired EE]

Maybe the three line diagram is not the best place to show the physical orientation of the terminals. I agree that the phasors should always rotate counter-clockwise and it is a good idea to represent them on the three line.

Physical orientation of the terminals and identification of the phase sequence should be shown unambiguously on some drawing in the package, probably a physical layout drawing or a phasing diagram.