Hi Jimbo:
My company generally doesn't use VRLAs because we find them to have a shorter life. We do keep both eyewash and shower available anyway, likely more to keep a consistent approach and there are often other chemicals around we might want them for.
I am not completely certain of the...
Thanks mgtrp, that's precisely what I was looking for. And no, it didn't show up in my searches so perhaps it's time to switch engines ...
Anyway, much appreciated that.
Sorry Cranky, I guess I left some details out. I think that's a common occurrence though.
These are conncected across the terminals of a CT circuit where the CT is on the neutral of a 72 kV cap bank. There are also 2 terminals tied to the 72 kV neutral. Our dwg refers to it as an "arc...
Hi all:
Does anyone know where I can find original info on Westinghouse KX-642 / KR85? I found a general description on a museum website which tells me it is a voltage arrestor. I need to replace several of these and would be more comfortable if I knew what the original specs were.
Thanks,
In our utility, PSSE is used for modelling Transmission lines, generators etc. I'm probably dating myself a bit, but it has the advantage that you can run scripts to look at multiple scenarios and 'let it run'. For example, find the fault level on hundreds of busses with a single run. It also...
See attached. I hope it's what you're looking for.
Ianhttp://files.engineering.com/getfile.aspx?folder=b3ae26a6-3438-4211-af52-21933ca2c1ad&file=YD22_&_D22Se_Relays_2.pdf
I thought of one more thing:
Presumably your field staff will need to operate these occasionally. If you ask a field guy to operate a device that is 5 or 6 times past it's due maintenance time, they might refuse to operate it live (ie open the substation breaker first). Personally I'd...
If you plan to avoid maintenance on overhead reclosers, there are a couple items you need to look at to 'cya'. I presume you (like myself) are working for a utility and your reclosers protect lines in public areas.
1. Can the substation breaker clear faults right to the end of the line? If a...
The vendors I've talked to don't endorse mixing layers from different manufacturers. In reality it's likely okay but none of the vendors will test their gear together with another's.
galen1119:
See attached for zero seq diag for the auto transformer type you're looking at (credit to ABB T&D Reference Book, formerly known as Westinghouse T&D Book).
The impedances shown on your diag are typically quoted for pos seq, not zero. In my experience the zero seq is typically 0.85...
Our utility used designations like that until recently. Specialist meant a job focused on operating, maintenance and troubleshooting. Engineering meant professional engineer (out of scope for us). Technical was a non-engineer (usu technologist) and was in-scope.
So a Substations Engineering...
In my old job, we used software based on ANSI/IEEE c57.92-1981 (Guide for loading oil-immersed power transformers). The guide contains the necessary algorithms to write your own software.
I can't recall if it addresses the older temp rise standards, but there might be enough of what you need to...
I am attempting to evaluate the reliability for modern style single phase reclosers (vacuum interrupting, electronic controllers). My gut instinct is that the recloser itself will outlast the electronic controllers. In other words, batteries and controller replacements would dominate the...
