Search results for query: *

abb have the relay raric but they are no going to manufacture the transformer

hi, look also to andritz and drs relay....if you don´t find more info come back to me

Hi I try to search some standards that show how a frange must be done on a hydro generator, (forged shaft).... and also some information about tolerances on holes and bolts that join the two shafts (generator and turbine) this is cause i find on one water turbine a problem, maybe related to...

Hi I try to cheek heat points on a double feed rotor from a wind turbine generator, this is a rotor to feed with 1800 V with a VFD with a 5 khz PWM control of the output so ripple will be on 5 khz on the voltage.... i have dismounted it, so i introduce 30 turns with 120 A on the magnetic...

thanks in any case..i hope somebody see the post and maybe some help will come, cause i know here are really experts.

je,je i need toknow the data for a new varistor.. cause really i don´t know hot to calculate the energy to disipate for varistor.....thanks

does somebody help me????

I got a generator and on rotor there a diode bridge and varistor, this one is broken or burnst is better word, so the genset is old.....and no information only this data Voltage on excitation: 127 V dc Current on excitation 113 A speed 750 rpm power 2175 KVA frequency 50 hz resistance on...

also do you have some paper where i could read about this subject???

electricpetter, thanks a lot, you talked about magnitudes... do you have some number to refer to standard, in the way that for this type of unit... a vibration of 11 mm/s is not too high or something like this.. cause generator normally is manufacturate to 20 mm/s.... thaks

Hi there I upload this spectrum of a generator, on the spectrum you´ll see on your left drive end and on your right hand non drive end, and i have vibrations on 5,5X, 4,5X, and i wonder if this means a loose bearing...but i´m not sure, cause most of vibrations are axial, so i can´t...

thanks a lot

thanks a lot..... for this useful information

Hi I need to rewind a rotor, and after strip all the coils onto the slot there are a lot o nomex paper with varnish, and it´s a hard work to clean...manually... i don´t want to use fire ... so i´m thinking on using some kind of solvent or acid...does somebody guide me or tell me some...

hi, finally i do a loop test, and finally i find some hot spots, so now it´s time for the question, the hot spots are due to the touch between stator and rotor, so.. it seems it´s surface, i try to clean it with a grind, but only takes more time to heat it up.... does somebody have ideas about...

turbo was broken and first time one cilynder

HI as in the last times, everybody must do, with crisis, all must do some jobs we are not experts, so that´s the situation, i have a 3000 KVA generator with a cummings motor diesel, so i have two rolling bearings on generator, so we start up the motor, and check high vibrations specially on...

Hi electricpete.... i understand your point, but in anyway i wont try to fullfit any standard, just i want to be sure i have a good stator core.... but i didn´t see why it´s worse to use in example 4 coils of one phase to check the heating of the core, really i think we don´´t need to have the...

ok,i was estudying all this documents, EASA and IEEE, and they was of interest, but now i try to apply to my motor..... really i´m interested on doing this test before take away the burned winding, cause if i must change the stator core, i would prefer to buy a new stator... for this i´m...

Thanks for all this information, i would study your formulas, and try to undertand... on other hand, the number of a 10º C rise form hottest spot to core average is a good reference, could you indicate in which standard i could finde, maybe on the named above IEEE 432. THANKS and for sure i...