Zero Sequence Voltage 3Vo

[3winding]

Is Zero Sequence Voltage detectable through a Delta transformer winding? It appears that the Delta would block it the same as zero sequence current?

Is there any good references on applying zero sequence voltage protection settings?

 

[alehman]

You are correct.

http://www.epri-peac.com/td/pdfs/PQA2004_Auto_Detection_Voltage_Unbalance.pdf

There also an article on the Basler web site about open phase detection which I believe discusses zero sequence voltages. I can't find it now because their site is down.

 

[3winding]

Thanks alehman,

 

[busbar]

 
An grounded-wye/broken-delta transformer set is one simple ‘zero-sequence filter’ used for 59N/59G ground-detection protective relaying. The Stevenson text and GE IAV and Allentown 59G relay ILs discuss applications on ungrounded and high-resistance-grounded systems.

See thread238-57405 and do an advanced search in electrical fora under “broken delta.”