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Anonymous Poster

Transformer Question

12/13/2010 4:55 AM

IS IT TECHNICALLY CORRECT THAT A 60 MVA GENERATOR TRANSFORMER HAS NO OLTC FACILITY? PLS JUSTIFY.
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PWSlack
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#1

Re: TRANSFORMER

12/13/2010 5:30 AM

Please turn off Caps Lock and define "OLTC".

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simbarashe gunzvenzve
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#2

Re: TRANSFORMER

12/13/2010 6:18 AM

By "OLTC" do you mean "ON LOAD TAP CHANGER"? If so, then may i say i have not come across any transformers of that size in our grid without an "OLTC". I think the right word would be "TECHNICALLY CONVENIENT"- it would be hell to correct those low voltage scenarios if it were otherwise.....

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PeterT
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#3

Re: Transformer Question

12/13/2010 2:45 PM

It is technically COMMON that a generator step-up (GSU) transformer will not have an OLTC (and yes, it is an on-load tap changer), because voltage regulation is not the issue here. However, it would be possible to put one there - it just wouldn't serve any real purpose. The generator regulation should keep it at the appropriate voltage for its generation at any time.

OLTCs are generally used on transformers that feed loads, such as in distribution substations, so as to regulate the distribution voltage under varying load conditions.

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vijaymail_electrical
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#4

Re: Transformer Question

01/10/2011 4:56 AM

Mostly GSU doesnt have OLTC because it will make the generators to lose synchronism with grid. They all have OFTC ( Off Load Tap Changer)..

Please correct me if I am wrong.

-Vijay

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