Phase Angle Regulator Protection 1

[Mbrooke]

Would anyone know how to go about protecting a phase angle regulator? What relay would best be suited (High Z/low Z) and what would I have to take into account when coming up with protection settings?

I have a few design/operational questions...

1. What is the voltage typically "seen" between the contacts of switch A (or B) when the regulator is doing max shifting? What would the current flow be if either switch closed into the same busbar the PAR is connected to, during max shifting? No shifting?

2. Should breaker C be electrically moved below breaker D? Advantage/disadvantage?

 

[thermionic1]

SEL has a paper from about 20 years ago on this topic.

 

[Mbrooke]

Thanks. Can you link it?

 

[Distribution73]

Hi,
Recently I did a bit of research on that subject. I came across a couple of interesting papers that might be of help:

https://www.pes-psrc.org/kb/published/reports/Protection_of_PAR_Transformers_Report.pdf

https://cms-cdn.selinc.com/assets/L...nSystem_MT_20150526_Web.pdf?v=20170324-134435

One is from SEL (not 20 years old though).

 

[Mbrooke]

Thank you! Those are a big help