Eng Tips Family,
DO any of you guys have any good material on calculating setpoints for differential relays? I am working on a SEL 487. Any help would be appreciated.
Do any of you here have experience with IWBC AL bus for a substation?
I am trying to find the short circuit forces between the buses and also trying to figure out the support spacing. All the material that I see online is for round busses. Any help would be highly appreciated.
Thank you in advance!
ET Family,
Does anybody have any experience energizing a power transformer by a temp generator with the breaker closed? Will there be a reduction in the inrush current because the generators voltage will rise from zero to nominal voltage and the transformer will not be supplied with the line...
EngTips Friends,
I have a few 35kV collection circuits coming from a PV farm to a substation. A small portion of the collection circuits will be overhead at a canal crossing. I am trying to determine, do I run separate over head ground conductors for the crossings? Or should I use earth as my...
Hello Eng Tips Family,
I have a question about the Neutral conductor in medium voltage distribution upto 33kV. Why is the neutral required even though there is absolutely no single phase load connected, specially towards the 33kV?
Also I have noticed that This Neutral is provided almost through...
Eng Tips Family,
I hope all of you are doing good. I have a question about grounding switches. We have a 230kV switching station with (1) 230kV double circuit double bundle line coming in. It is about 16 miles long. I am trying to figure out whether the disconnect switch intercepting this line...
Eng Tips Family,
I hope all of you are keeping safe from the current pandemic. I have a question about the turn ratio of HV potential transformer. In west coast I have noticed that the most PT specified are Y connected with center tap on secondary side. For example for a 230kV system, PT would...
Eng Tip Family,
I know I have asked a similar question before. But I still have some concerns, I am sizing the bay jumpers and I have questions about the behavior of jumpers under fault conditions.
I calculated the jumper size based on steady state current and limited the temp to 160 deg F. But...
Eng Tips Family,
Can anyone please help me explain the Standard Burden for VTs(Table 15, IEEE C57.13). Also I have seen VTs with multiple burden ratings. What does that mean? For example, a VT with 0.15-WXYZ.
Thank you in advance.
Eng Tips Family,
Can you guys please give me any physical implications of choosing nitrogen blanket vs oil conservator for power transformers? I have a 50MVA transformer and I normally leave upto manufacturer to suggest the oil preservation system. But I am trying to understand the effects of 1...
Eng Tips Family,
Can you guys please help me with an easy reference to how to calculate the required MCOV rating surge arresters for different pieces of equipment. For example, how to determine the MCOV of required surge arrester for a transformer or for an underground feeder etc.
Thank you...
Eng-Tips Family,
Does any body here have any Autocad Electrical Experience? I am new at it and trying to learn from youtube but asking questions to a real person will be really helpful. If anybody is willing to help me please respond.
Thank you in advance.
Eng Tips Family,
I am working on a small section of transmission line design and was wondering if anybody has PG&E Interconnection Handbook? If yes can you please send me a link or pdf copy? The information present on pg&e website is not enough anymore.
Thank you in advance.
Hello Everybody,
I have a pretty goo understanding of the symmetrical components(atleast the mathematical part). What confuses me is the symmetrical component circuits of different pieces of equipment. Like oh we have a wye-delta transformer, here is the zero sequence, positive and negative...
Hello,
I have a 25MVA GSU for a solar field YDY configuration. There is no load on Delta, it is only there for stability/Harmonic suppression. I have a couple of questions about the buried delta.
1. Under what conditions should we bring out the corner of a burred delta outside the tank through...
Hello Folks,
I have a generating station with three 2.5MW gas units. We have high resistance grounding on the gensets and they are connected to 3 wye-delta step up transformers. At high voltage delta side a neutral will be achieved using a zigzag grounding transformer. I am trying to figure out...
Hello Everybody,
I am trying to figure out how to select the size, quantity and spacing of an ACSR Bay jumper in a substation. Also what temperature rating should be used. Any help would be highly appreciated. Thank you.
