59 ansi overvoltage protection on hydro generator
59 ansi overvoltage protection on hydro generator
(OP)
I have a generator 10 MW, and the manufacturer specifications says voltage must be on +/- 5 % of Vn and ask me how i´ll avoid the generator works out of this area, i read IEEE standards and sugest for this point a ajustment of 110 % of Vn, and with this ajustment i think i didn´t protect generator as manufacturer claims..... for this what´s wrong manufacturer. the standard or there´s other way to protect the unit for working out of this area...
thanks.... cause i´m a little confused....
thanks.... cause i´m a little confused....





RE: 59 ansi overvoltage protection on hydro generator
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: 59 ansi overvoltage protection on hydro generator
RE: 59 ansi overvoltage protection on hydro generator
By the way, standards are not laws. The mfr. may be taking a conservative approach. Try talking to some other engineer at the mfr. Only the mfr. can answer as why they say what they say.
Rafiq Bulsara
http://www.srengineersct.com
RE: 59 ansi overvoltage protection on hydro generator
RE: 59 ansi overvoltage protection on hydro generator
Rafiq Bulsara
http://www.srengineersct.com
RE: 59 ansi overvoltage protection on hydro generator
"..the more, the merrier" Genghis Khan
RE: 59 ansi overvoltage protection on hydro generator
RE: 59 ansi overvoltage protection on hydro generator
RE: 59 ansi overvoltage protection on hydro generator
RE: 59 ansi overvoltage protection on hydro generator
thanks
RE: 59 ansi overvoltage protection on hydro generator
Your company obviously has ordered a generator with a standard voltage variation of plus/minus 5%. Had you asked for plus/minus 10%, the OEM had designed the generator accordingly.
A generator with plus/minus 10% will be designed slightly more conservative as far as stator flux densities are concerned because core iron losses are higher when running at 10% overvoltage. Excitation current then is also higher, resulting in higher field temperatures. The groundwall insulation also would have been increased slightly had you asked for plus/minus 10% in the first place. Nevertheless, running at plus 10% should not really jeopardise your generator unless the OEM went to the limits with their design. Running at minus 10% would increase stator winding temperatures.
To overcome your problem I'd suggest you to adjust the transformer tap changer.
Wolf
www.hydropower-consult.com