I am interesting about operation of asynchronous engine in escalators moving down. Is the engine working as generator? If so, can an overload beyond maximum couple cause an escalator overspeed? Moreover, in generator operation, is the energy lead into grid or dissipated in a rhesostat? Thank for...
A three-phase 11 kV aerial line on metal supports must be transferred to the new higher metal supports substantially in line with earlier. The supply line must be kept available, although of course out of service, during the raising of the new poles, but one of the phases goes to touch them. It...
A bare wire stretched in the air, in particular the conductor of a power line taut between their supports on its isolators, and never fed, without any type of electrical connections at the ends, can be the site of electrostatic charges? If so, why?
I would like to ask if it is allowed lay MV cables (e.g. 20 kV) in tunnels or wells where LV power/control/monitoring cables are laid. See photos, please.
http://snag.gy/p1DsC.jpg
http://snag.gy/wswzq.jpg
http://snag.gy/Jb5o7.jpg
http://snag.gy/1iGwA.jpg
I am looking for a refresh book about power plants/systems. I like Nasar "Schaum's Outline of Electrical Power Systems" but I find many mistakes. Do you have any suggestion? What do you tihink about Wayne "handbok of electric power calculations"?
Do you know these
http://bernatom.com/uk_savoir-faire-recouvrement-cables-cuivre.php
http://bazkideblog.eraikune.com/2012/05/sistema-antirrobo-de-cables-de-cobre/ ?
Any experiences?
I like the first.
Do you have other suggestions?
Concrete platforms with electrowelded net are being realized in a substation renovation, see the photos. Do you share this solution?. I have some doubts about those because the earth grid becomes inaccessible.
Do you have experience of SF6 "Voltage Transformers" in HV (150 kV) lines? Which problems would you consider (explosions, ecc.)?
P.S. example http://www.trenchgroup.com/en/Products-Solutions/Instrument-Transformers/Inductive-Voltage-Transformers/SF6-insulated-Inductive-Voltage-Transformers
Sorry for the sacrilegious question, out of curiosity I would at least understand how such an instrument. I've had a rough idea of the rudiments of the theory (put up the instrument, collimate, etc..). I also have a Trimble 5600 of about ten years, without at least one couple of years and I...
A question about a 132 kV substation working.
For photo, link to
http://img849.imageshack.us/slideshow/webplayer.php?id=22131448.jpg
please.
I would want to ask you what you think about a wood barrier, done in it to separate "Vicinity zone" from a "Live working zone" (as in EN 50110-1...
