We use it for protecting a feeder circuit w/o a neutral conductor.
The reason? The feeder is a long line, and the phase overcurrent relays would not pickup any faults, even when the lines were broken and on the ground (still energized).
We theorized that with negative sequence protection, it...
We had a fence contractor insert vertical vinyl plastic strips designed to fit into the weave of the fence's chain, and diminish the interior view of the substation equipment.
While the plastic strips did not totally block the view of the substation interior, it did provide increased privacy...
Thanks to everyone for the comments!
to ZogZog: I haven't got the numbers yet. One of the aux. relays was charred from the fire (which was extinguished promptly). As soon as I can get the numbers, I'll get them to you. Gracias Amigo!
I need to know sources of replacement parts for a vintage 1960 Allis-Chalmers (A-C) circuit breaker used in a metalclad switchgear lineup?
I have already contacted Siemens, who purchased the circuit breaker division from A-C, but haven't heard anything.
bloodclot, can you be more specific as to approximately what percentage of the day is spent on non-engineering tasks?
Maybe if you present this to your management, it will help you in your argument FOR more help.
You sound as if you work for a small(er) firm, and what you described above is...
You are correct. The term padmount opens up a whole new set of terms and definitions relating to underground power distribution.
The terms are:
dead-front primary connections (no exposed high-voltage parts, to accommodate rubber 'elbows', with no bushings. Very popular for safety reasons...
Try using the Lindsey voltage sensors:
http://www.lindsey-usa.com/CVMI.php
We didn't have any problems with these sensors. Make certain you use Lindsey's low-loss instrument cables, otherwise it will not function correctly.
I think waterproofing is important. We've had to replace much of our URD cables, due to water trees. And after going out a few times with the lads, and hearing homeowners complain about our trenching trying to dig up the location of failures, we do everything we can to get stop water from...
RalphChristie, how old is the equipment shown, and had it been power factor tested? Also, don't you do FLIR scans?
We had a similar incident about six years ago, but an old, untested (power factor) PT was the bad boy. The other PTs were tested right away, and found to be in sad shape, and...
I've tried PageMaker and FrameMaker, but I think the best ($pricey$) is BroadVision's Quicksilver (formerly called InterLeaf Publisher. This bad boy is fully automated, and will re-paginated, change page numbers for figures, etc., automatically if you insert/remove pages. It is the best for...
We performed line maintenance on a tranmission line H-frame structure approximately 18 years of age.
After removing the conductor from the porcelain insulator attachments, 3 out of 4 of the insulators 'fell apart' in the linemen's hands from cracks.
We never stock porcelain insulators any...
Also, Cooper Power Systems hold classes in distribution protection for people like yourself.
You can order Cooper Power Systems' book "Electric Distribution System Protection" online for $50
by first registering at http://www.cooperpowercentral.com/Public/Registration.aspx
Hey wait a minute. Isn't 345 kV the L-L voltage? And why would anyone have a L-L connected station service transformer?
If 345 kV is indeed the L-L voltage, the L-G voltage is 199 kV, within range of Kuhlman's 230 kV limit.
