Hello ALL,
This question is succession to my earlier question regarding reclosing. I appreciate the input.
On my 27 kV system, station bus has a fault 3 ph fault of 631 MVA, approx. 13000 A. The feede is a mix of O/H and U/G, run of 6000 m. Fault at customer main incoming primary 27 kV...
Hi All,
I am programming a GE relay for a new feeder in a 27 kV station. feeder length is approx. 7 miles. Approx. 3 miles of feeder length is underground cable and rest is overhead line.
Is there a thumb rule that can advise for this feeder not to have reclosing because approx. 50% of...
Hello,
"I aplogize for not being very much specific in the information here."
I need some input into understanding my responsibility as an engineer and vendors responsibility who is supplying the equipment.
I am planning to buy a arc rated switchgear for a "X kV" voltage. For testing...
Hello All,
I am buying a 4.16 KV swgr fed by two incoming XFRM's rated 5 MVA, 27.6 kV/4.16 kV. Both will operate in parallel with no tie.
Voltage= 4.16 kV
TR1= 5 MVA %Z1= 5
TR2= 5 MVA %Z2=5
Short Circuit Contribution MVA(TR1)= 20 P.U.=13895 A
Short Circuit Contribution MVA(TR2)=...
Hello,
I have done my homework well before asking this questions and also read posts here as well. Because, I am not an expert so need your final opinion,
Q#1 Why in most of the cases, we d'nt consider DC offset value of current in to calculation when the whole point of calculating...
Hello,
I truly beleive in" If you dont use it you loose it".
For the last one year, I have started working for a utility and working on 27.6 kV and onwards, I completely forgot how to set a molded case circuit breaker, which I used to know everything about. 120/208 V panels are the last thing...
Hi,
I had posted a similar post in the past as well. Unfortunately, I have not been able to find proper litrature issue on this subject. I am sure, some of you have come across this and will be able to advise me some useful input.
1. Partial discharge or Corona test= Is this traditionally a...
Gentelman,
My earlier post is related to the same equipment. While preparing a spec for a 27.6 kV outdoor breaker in a HV substation, I requested for vendors to provide me with a
velocity transducer point in front for motion testing using doble TDR3000. It is a standard for our utility. I...
Hi,
COuld you advise the preference for a porcelain type or epoxy material for bushing CT application for a 27.6 kV outdoor installation. I tried to search a lot but not much help.
I would appreciate a word.
Thanks
Gentleman,
I am trying to find a thread that talks about CTI between main secondary breaker and feeder breaker in a medium voltage system. I recall very well I saw it here but am having a hard time recollecting the exact name.
Thanks
Gentleman,
My second question on this forum. My first question response was of immense help.
I have a 27.6 kV primary and 13.8 kV secondary. It is a Star/Delata transformer. Secondary has a grounding transformer.
My question is how realistic is to provide a single phase supply to customers...
Hello Everbody,
My first post on this website. I am sure my diemna will be resolved. I spent all Friday evening to figure this out but my logic did not make sense. May be my physics skills are not the best to understand concept of holding and closing coil...
