Search results for query: *

Hi, I've been waiting to write this for 8 months just to proof that the engine is OK. About 8 months ago we have an incident that generator breaker was fail to open, resulting approx about 20 minutes we have reverse power about -1 MW. At that time the operator donot realize that breaker fail to...

Hi, I work in Power Plant that its sister company has steam turbine breakdown caused by failure of DC emergency during black out, We've bid to replace the battery system, Since the supplier or battery manufacturer trying to sell us their product so I feel their "technical input" is somewhat...

We have been sending our calibrators for calibration to recognize calibration lab. This always done once a year for the last 6 years since our plant startup. This year I've been ask by Cost control manager, Why I need to send out calibrators for calibration every 12 months, and my stupidity...

Dear all, I would like to continue my education,but my work condition do not allow me to go to campus, so I think I will enroll to "e distance learning program". after some search, its so much information, university that offer online learning. It got me confuse. I have 3 years of intensive...

Hi, I got several 820nm multimode device 10Mps(a remote electrical meter)I'm thinking of buying a switch for that substation, can I use 850nm switch 10Mps, because I cannot find any swicth that specified 850nm ? thanks Pitat Haeng

All, I've read the REA Bulletin 1724E-200 about design manual for high voltage trasmission lines. Page 8-2 on 8.2.3 "Deadends : In situations where the insulator string is in line with the conductor , the number of bells should be two more than what was used for tangent structure". I...

All, I have 5 kilometers 33 kV overhead line, with hawk conductor. Now reach its ampacity limit which the table says 420 amperes. Its happen statistically once per Hour for a month (caused by addtional motors that start periodically), sometimes get to 430 amperes. What is going to happen or...

I need input, What would you do to tell the bidder that they do not win the project ? By written letter and send by mail, by email, on phone ? wich one is more ethical ? thanks Pitat

Dear all, I have island system with 150 kV bus. From this bus wehave 150/33 kV step down xfmr and and 150/11 kV xfmr. the 11 kV xfmr has NGR 200 amps 10 sec. the 33kV xfmr is solidly grounded. Several times if we had fault on 33 kV the voltage dip on 33 kV side untill 3 kV and the voltage on...

Dear all, Could you suggest me an engineering firm that specialize on designing transmission line, study on towers and insulators ? world wide would be OK. thanks Pitat

Dear Forum, I've tried to find the similar trhead but unfotunately there is no thread discussing this matter. We have 150 kV transmission line double circuit distance 16 km with average load 110 MW. Recently we experinced flash over on some of ceramic insulator and trips both lines, the weather...

Dear Forum, I just got question from the operation people on How the power factor correction in the system can calculate in saving of fuel ? I could not give them direct answer, my answer was, the power factor correction could reduce the amps flow in equipment (generator, trf's,transmission...

Guys, Another silly question again from me, I have A xfmr 11kV to 3,3kV Dyn1 on the name plate says "Full load KVA" 7500/8400 OA 9375/10500 FA Is it means 7500 KVA for W1 and 8400 kVA fro W2 with oil cooling only, and 9375 KVA for W1 and 10500 for W2 with oil cooling and force...

Guys, Is there anyone had experience pumping water with windmill as power source. I need someone to advise me a website or books about pumping water with windmill. It is not a big one, I just need to pump water with suction head 25 meters pumps to a 3000 liters tank, for home use. Thanks in...

Guys, Is there a standard for manufacturer to provide differential CT's on big motor (350HP and above) or just the custumer ask them to provide that ? Please advise. Thanks Pitat

Guys, I have 6 transformers each about 60 MW leaking. all transformer below 5 years old. and all leaks from flanges gasket. I already contact the XFMR manufacturer and no good answer. I read on some papers that to fix leaks thats not big just use coumpound like glue around the gaskets, Can...

ALL, There's a new interconnection to my system from a contractor. They have 3 diesel generator 400 V 3 MVA. The Starpoint of each generator are solidly grounded. To Match our system voltage in our main bus they have to step up to 11 kV. Each generator have step up XFMR. the 400 V side is wye...

Guys, I have 4 sets of VLRA battery that very critical for my plant (supplied emergency lube oil pump). The IEEE Std 1188-1996 recommend to do performance test and test discharge rate once a year, how you guys do that, use load banks ? or I miss some thing here (english is my third language). I...

All, Anybody can tell me where I can buy this ? Manufacture address or web site. Tanks Pitat Haeng

Hello every body, I have problems with my motor protection lots of them, often false tripping and no cause found try hundred times to to trouble shot or probably incorrect settings but everything seem OK. When I found technical paper from GE chapter 10 A-C Generator and motor protection on...