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mohammad abdur rashid
Member

Join Date: Feb 2010
Posts: 7

Tertiary Windings in Power Transformers

03/05/2010 9:01 AM

Dear all,

I would like to know the following :

There is a tertiary delta winding in 230/132 KV auto transformer in the grid sub-station. What is purpose of that tertiary delta winding in transformer? Please explain.

Thanks.

Rashid
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Electronaut
Commentator

Join Date: Dec 2009
Location: Mangalore, India
Posts: 65
Good Answers: 4
#1

Re: Purpose of tertiary winding in power transformer

03/05/2010 12:01 PM

In the case of large transmission autotransformers, which must of necessity be star/star connected, a common use of the tertiary winding is for connection of system compensation equipment.
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sidhu16
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India - Member - New Member Engineering Fields - Electrical Engineering - New Member Technical Fields - Technical Writing - New Member

Join Date: Feb 2010
Location: India
Posts: 92
Good Answers: 2
#2

Re: Tertiary Windings in Power Transformers

03/05/2010 11:57 PM

The main purpose of tertiary windings-

1. To eliminate or reduce the harmonic component and keep system healthy.

2. To protect it from neutral shifting.

3. Some time, it supply auxiliary loads.
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electricalexpert65
Guru

Join Date: Oct 2009
Posts: 2061
Good Answers: 169
#3

Re: Tertiary Windings in Power Transformers

03/09/2010 8:50 AM

Normally such tertiary is Delta connected; this is to provide a circulating path for zero sequence currents.
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