Search results for query: *

According to an IEEE paper that compares ANSI and IEC BIL test procedure, it was stated that "The IEC impulse voltage test requires that 15 impulses of a standard 1.2/50us voltage wave be repeated with a maximum of two disruptive discharges across self-restoring insulation and no disruptive...

Thanks again for all your feedback and references.

Hi all, I have an outdoor metal-clad switchgear application at 34.5kV, 2500A that required the use of hollow round copper bus. Outdoor condition is hot and high humidity. A 1/4 x 6'' flat bar rated 2700 A @ 65 deg C rise was the guideline according to this Copper.org website...

Thanks to everyone who provided inputs to my inquiry. Looks like I would have to go with scottf on VT specifically design for 25 Hz, instead of derating the 60Hz VT. One more question, does the primary/secondary fuse amp rating requirement will be affected by the reduction in frequency? In my...

Hi all I had a request to supply VT drawer (for an old mining site) connected as open delta, 13.8kV/120V, operating at 25Hz. Accuracy required is 0.3Z with thermal burden 400VA ea. My questions: 1) Is it possible/feasible to derate a normal 60Hz VT for use in my application? If yes, is...

Check out this site on MVAJ Tripping Relay brochure. http://www.tde.alstom.com/servlet/ContentServer?pagename=OpenMarket/Xcelerate/Render&c=AGF_Product&cid=1030365247731&rid=1018348589697&norid=true

Hi, I'm sourcing for a current unbalance relay for capacitor bank protection. It's a 3-phase relay and input 5A. It has to be single function relay and inexpensive. If you guys have any recommendation on manufacturers, pls let me know. Thanks a lot. TK