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...
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...
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...
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
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 everybody, hope this new year would be full of new knowments and sharing of them.... i have a stator core i would like to cheek searching for hot spots on the core, firstly i would present our friend, this is an motor 1500 rpm 850 kw and 660 V, and cause an ausence on manteinance, the bearing...
I got a vertical hydro unit with a 6 meter rotor diameter and an theorical airgap of 15 mm, so i was looking for some IEEE standard that define the tolerances on this airgap between pole face and stator core.
Does somebody know it? i read on some place about 5 % on teorical airgap and on other...
i have a problem with an excitation system, i have a short diode alarm, i know the ripple must be higher than normal, how much % of ripple i must have? and now we suppose we have a 6 pulses bridge on the avr, and if one of the SCR have the driver disconected, so it´s not working, how would...
I try to balance a fan with 3000 mm diameter, like a propeller, and I ask on my supposed ignorance for a dinamical balancing, and the guys on the office laugh with me, cause they tell me that this kind of stuff is not possible to balance on dinamical way, i´m not interested too much on...
I got a 600 mm bore bearing with 8 segments, and measuring the clearance forcing the shaft against the pads with a jack with 1 Tn pressure, the values are out of clearance, the clearance is 0,50 mm for a speed 1270 rpm... i know there is a correction number to correct the value you read.. does...
I got a 600 mm bore bearing with 8 segments, and measuring the clearace forcing the shaft against the pads with a jack with 1 Tn pressure, the values are out of clearance, the clearance is 0,50 mm for a speed 1270 rpm... i know there is a correction number to correct the value you read.. does...
i got a italian S2 service asyncronous motor, 90 kw and normally i saw S2 50 % or something like this, but this time it´s only S2 no time or percentage.... so how much time it could works.
thanks
Hi i find on my office a avo megger b131 and i wonder exactly what it does and how it works, so i surf on google, but i just find a data sheet and i´ll like to get something like a manual....
could somebody help me...as always thanks for your attention
Hi
I got a little problem with the efficiency of 4 MW genset, it´s hydro, and 600 rpm so 50 Hz, and in the design it comes without magnetic wedges, now it is needed to rewind, so i was thinking on get more efficiency with magnetic wedges, cause i´m supposing the iron losses will decrease...
i know i send two questions today, but i was curious about this and this is not my main area, we got a pump centrifugal pump, about 1,2 MW 4160V and it´s gonna move some water from a tank to a higher level, 50 m high, there´s no valves, this means that when you detect level enough pump would...
I was talking the other day with a friend of me and tell me that when you use a genset for starting in example some motors with VFD, you´ll need to overdimensioning the size of generator, this means in example if you are with 1,7 MW pf 0,8, this means 2,12 MVA, if you use VFD you would need...
I know there is some standard to define the overshot voltage and ts time (time to reach a steady state), i would like to know about the calculation values, cause if you see on table there is terrible high values, 80% overshoot i think it´s too big..
I ask for the standard that define this, and...
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...
