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samsam_sam45
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Join Date: May 2011
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Transformer Loading

06/06/2015 10:37 AM

Dear Friends ,

I need clarification to subject of transformer loading , I have selected the size of Transformer 2000kVA & Running load is 1780kVA , loading 1.12% , other future loads will not be added more on this transformer this is confirm, but i just wanted to know 12% is ok i can go with this transformer size will it have any problem or any one have any IEC reference that its suitable to go for this size of transformer for the running load , Main breaker after transformer is 3200A this is not a problem but only confused for transformer.

Kindly need advise.

Thanks & Regards

Samuel
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lyn
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#1

Re: TRANSFORMER LOADING

06/06/2015 12:02 PM

Samuel,

international standard iec 60044-7 - the IEC Webstore

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7anoter4
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#2

Re: TRANSFORMER LOADING

06/06/2015 1:33 PM

I agree with Lyn :it has to be an electrical engineer job.

If the load is 1780 kVA indeed then this represents only 89%[1780/2000] -it is not 112%[in my opinion].

The circuit breaker in the secondary protect the down stream installation-cable mainly-and it seems to be good[however you have to check what kind and size of the cable will be installed]. If the initial load is 1780 kVA only, then for a limited duration, the 11% could be tolerated by any type of transformer.

By-the-way: IEC 600076 -what Lyn intent to say-it is the IEC Standard for power transformer [they are -as far as I know- 14 volumes-IEC 600076-1 is the general one.]

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lyn
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#3
In reply to #2

Re: TRANSFORMER LOADING

06/06/2015 2:10 PM

Thanks for the help.
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samsam_sam45
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#4
In reply to #3

Re: TRANSFORMER LOADING

06/06/2015 2:28 PM

so my running load is 1780 and selection is 2000kVA , so i can go for 2000kVA transformer .
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lyn
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#5
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Re: TRANSFORMER LOADING

06/06/2015 2:45 PM

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samsam_sam45
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#6
In reply to #5

Re: TRANSFORMER LOADING

06/06/2015 2:51 PM

please i just ask your support , if you cant just let me know this is not the right way ok, Mr.LYN
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lyn
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#7
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Re: TRANSFORMER LOADING

06/06/2015 3:47 PM

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samsam_sam45
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#8
In reply to #7

Re: TRANSFORMER LOADING

06/06/2015 3:53 PM

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lyn
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#9
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Re: TRANSFORMER LOADING

06/06/2015 4:06 PM

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Noudge79
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#17
In reply to #9

Re: TRANSFORMER LOADING

06/08/2015 11:02 AM

Wow, you must have a nice day with Sam2x

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Tornado
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#10

Re: Transformer Loading

06/06/2015 5:21 PM

This transformer will probably work fine, but it still would be advisable to check with the manufacturer as to what intermittent overloads it can handle. Your local electrical regulations may have requirements for transformer sizing; check them also.

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suresh sharma
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#11

Re: Transformer Loading

06/07/2015 7:13 AM

Nothing wrong in asking foolish questions. One can just need reply them. IQ levels are different for different people.

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lyn
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#12
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Re: Transformer Loading

06/07/2015 11:04 AM

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samsam_sam45
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#13
In reply to #12

Re: Transformer Loading

06/07/2015 12:54 PM

Dear Suresh & Tornado thanks for your replies , I hope you do not have any problem I keep posting the comments Iam sorry if my questions are not meaning ful but please atleast iam expecting replies so that i can understand iam going on right way .

Thanks ones again
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lyn
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#14
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Re: Transformer Loading

06/07/2015 1:55 PM

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lyn
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#16
In reply to #13

Re: Transformer Loading

06/08/2015 10:17 AM

samsam_sam45,

My apologies for my rude behavior.

Lyn
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samsam_sam45
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#18
In reply to #16

Re: Transformer Loading

06/08/2015 2:44 PM

I apologies to you also lyn i said bad also , actually iam not an electrical engineer , Iam from instrumentation background my work from past 5 years is on instrumentation but i got an opportunity for design & automation side ,at automation side i dont have any problem where as electrical side not so confident in taking decisions so iam trying myself to do what as much as i can ,this is the reason i ask here

ones again sorry for you .
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suresh sharma
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#19
In reply to #18

Re: Transformer Loading

06/09/2015 12:57 AM

Well, everything ends well is well. Some times we loose our cool and say something offending that is part of our human nature. After all we all are human beings so forgiveness is great.

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SHOCKHISCAN
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#15

Re: Transformer Loading

06/08/2015 10:01 AM

I suggest you contact the transformer Original Equipment Manufacturer (OEM) technical support with your questions and concerns.

Depending on the manufacturer, year, and design of the transformer, loading it at 89% of rating may be detrimental to the transformer.

Some transformers are/were designed to be operated in an overloaded condition in order to maximize efficiency so operating them at too low of load can cause excessive heating and/or rapid damage and/or premature failure.

Only the transformer OEM can answer your questions effectively.

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7anoter4 (1); lyn (8); Noudge79 (1); samsam_sam45 (5); SHOCKHISCAN (1); suresh sharma (2); Tornado (1)

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