I have a question regarding a breaker and a half protection scheme. Please see the PDF sketch I have attached for reference.
This is the current set up we are looking at: A breaker and a half configuration with the Tie Breaker as a normal open point. The protection (drawn in blue) is in a...
Hello to everyone again,
My first post on “Transformer Maintenance Practise” generated allot of useful information so I would now like to post this new thread on maintenance schedules. I know lots of companies are trying to optimize their maintenance practise and lots of places tend to neglect...
How long should we pull a vacuum on a transformer before we fill?
We have a contractor repairing leaks on one of our transformers that required the tank and OLTC to be drained of oil. The unit is a 44kv to 8.32kv 12.5MVA unit with 2465 Imp Gals of oil in the main tank and 203 Imp Gals in the...
Hello to all again,
I got such a good response on my first post that I thought I would ask again. This time it is about equipment. We are looking at getting some portable IR cameras that can be used regularly by our maintenance and operating crews. We currently have a FLIR PM695 that we use for...
Hello to everyone this is my first post so as a little background I work for a medium sized electrical utility in Ontario Canada. I have been put in charge of building a new maintenance program for our substations and am in the process of collecting information.
We are starting with power...
Hi Everyone
I need to calculate the positive negative and zero sequence impedance for various lengths of 1250 MCM Pilc Cable. Just wondered if anyone has a formula or could give any help.
Cheers
