I am struggling to understand zero voltage across terminals H1a and H1c of GE F60
UR relay. Contact status in the relays shows de-energized(open).
This contact is part of GR UR family Form A and has a current and voltage monitoring
circuit and for some reason there is no detail what is the...
Hi,
I have exhausted all resources on the internet and books that could help me understand the phenomena in the subject above. I owe this to may be my poor understanding of phasors specifically related to primary and secondary winding of transformers.
And I need your help.
I wanted to program...
Hi
Few questions please ;
1. Would it be correct to say that as per IEEE C57.13 by default CT thermal rating is rated at 30 degrees if not specified otherwise.
2. If I have a 800: 5 CT rated at 55 degrees with thermal rating factor of 1.33, then what would be the rating at 30 degrees...
Hi
I was trying to make a quick excel sheet where I could plug in some relevant information and get the secondary excitation voltage during a fault event and see if my CT accuracy selection is ok. Below is the link, I was using as a quide...
Hi I have a existing old 4.16 kV switchgear which i need to replace. It is fed from two main transformers 5/6.67 MVA @ 27.6/4.16 kV.
I dont have a way to find out the existing bus rating but on 4.16 kV, We have been buying a 2000 A bus switchgear but those transformers are smaller.
This is...
Hi All,
Practicing electrical engineering for the last 10 years this never came to my mind till my nephew who is studying electrical engineering starting discussing the difference between CT and power transformer concept. Let me start with what I know and may you can interject and kindly...
Hi
I have attached a pdf file that shows breaker and bus arrangement for a 4.16 kV switchgear.
Background:
This project is replacement of a 1950 switchgear supplied by GE and has basic overcurrent protection on the feeders and 67 directional relays on the two main incomer feeders.
As part...
