transformer rating

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razzle

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i have been passed on a job from someone that has left a company, and with him went the info i am looking for .i need to know the amperage output of this transformer, which is connected to overhead powerlines in central america, this is the info i have.
x1 x2 x3 prolec 50 and a number down the side , which is 4580e

Edited out your e-mail address. Charlie

[ August 07, 2004, 05:25 PM: Message edited by: charlie ]
 
Re: transformer rating

razzle, I'm not dazzled by your transformer knowledge. ;) (Sorry, I couldn't resist.)

The amps output depends on the load. To calculate the rated amps the KVA, voltage, and whether it is single or three phase, would have to be known.

Prolec is a GE brand name. The 50 could be either the frequency or the KVA rating.

Ed

[ August 07, 2004, 12:39 PM: Message edited by: Ed MacLaren ]
 
Re: transformer rating

As mention by Ed, it is a GE brand name. I think the are liquid filled transformers. Check with the www.geindustrial.com catalog and match physical sizes to get a ball park as to what you are looking at. It should have a nameplate with a model number.
 
Re: transformer rating

The transformer should have a nameplate which includes the primary and secondary voltages, 1ph or 3ph, and the kva rating.
With that info one can provide the ampere capacity for which the transformer may be loaded to.
 
Re: transformer rating

to whom it may concern , i have now discovered that the transformer is a 50 kva transformer this transformer has two phases and ground 110 volt output mounted on a post connected to overhead power lines what is done here if they need 220 volts they bring both phases to the outlet, i want to know how many amps is this transformer capable of .

Edited out your e-mail address again, please use the PM (Private Message) system if you wish to give someone your e-mail address. Charlie

[ August 08, 2004, 05:44 PM: Message edited by: charlie ]
 
Re: transformer rating

In response to your PM, the 208A is for each phase and you would choose the cable size dependent on the code in force in Latin America and the overcurrent protection you choose.
For example some may choose a 250A breaker with 250kCMIL (thousand circular mils) copper phase and neutral conductors and a #4 copper equipment ground. Where a #4 is 21.15 mm^2 or 41740 CMIL, depending on how conductors are specified in your area.
 
Re: transformer rating

hi ron . thanks for getting back to me.
would this transformer be calculated like this
secondary voltage 50kva divided by 120 volts equals 416 amps approx per phase as this is only a two phase and ground transformer, would that be right saying that the transformer had a total rating of approximately 832 amps.
also the cable sizes here in latin america are the same as yours No 4 6 8 10 12 etc. also i would like to know the current rating for a 0.0 cable.
and also the current ratings for the following cables.0.0 2 4 6 8 10 12 14

EDITED OUT E-MAIL ADDRESS AGAIN.

[ August 17, 2004, 02:43 PM: Message edited by: dereckbc ]
 
Re: transformer rating

hi ron
just to let you know a little bit more about what i am dealing with here .the secondary side of the transformer connects to what i have been told as 0.0 size cable , this then branches off to about 50 electric meters at several different places on the run, there is no breaker between the cable coming in and the meters, this i know sounds crazy , but apparently that is how it is done here.the only breakers they have here are in the fuseboards protecting the individual circuits. if at any time you need to work on the fuseboards you take the meter off the wall which disconnects the load side to the fuseboard, so it appears they have no protection for there meters.i say their meters , but they dont supply them, you have to buy and install your own meter, and then the electrical company eventually comes around and takes the details of the meter, and then you get charged from then on
also there is no isolation between the secondary voltage and the supplying cables to all the meters at the transformer, as far as i know the so, called electricians do everything live here.
ok speak again soon
thanks ray.

EDITED OUT E-MAIL ADDRESS AGAIN. DO IT AGAIN AND I WILL CLOSE TOPIC. DERECK

[ August 17, 2004, 02:42 PM: Message edited by: dereckbc ]
 
Re: transformer rating

50 KVA 120/240 V with overhead open wires distribution scheme it's a familiar way for electric public distribution system, the secondary protection is in the primary fuses, this way is to enhance the continuity of the public service, here in Mexico the responsibly of the electrical installation after the meter is under the owner of the house, after the meter is under the responsibly of the utility, the meter is a 2 phase 4 wires 100 A, then the main disconnect must be under 100 A, note the system is a multi ground, the owner has to install a ground electrode in his property to connect neutral (which is grounded in the transformer) to ground, here you have the main bonding jumper inside the meter, from here you install the grounded and the grounding conductors.
 
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