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raovasuki17
Active Contributor

Join Date: Apr 2010
Posts: 16

Neutral Doubts

11/27/2012 12:24 PM

i have a Power transformer rated as 3.15 MVA , 34.5KV/480V,Dy11.

What is the minimum number of neutral grounding points on LV side?

if minimum Number of neutral grounding points are 2, what should be the minimum distance between them?

What is the recommended earth resistance value for this transformer?

Can the neutral grounding point be connected to Plant Ground mat?

Please help me

Thanks and regards
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Fredski
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Join Date: Feb 2011
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#1

Re: Neutral Doubts

11/27/2012 12:40 PM

MVA or KVA?
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lyn
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Join Date: Oct 2008
Posts: 42355
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#2

Re: Neutral Doubts

11/27/2012 12:50 PM

Where's the documentation on the transformer?

Everything you want to know will be in the documantation.

If you don't have it, get it from the transformer manufacturer.
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jack of all trades
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New Zealand - Member - Kiwi Popular Science - Weaponology - New Member Engineering Fields - Power Engineering - New Member Engineering Fields - Electrical Engineering - New Member

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Location: Auckland, New Zealand
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#3

Re: Neutral Doubts

11/27/2012 1:28 PM

What do your electrical standards and regulations say?

What does your site or customer specification say?

The first will dictate what you should be doing with the second possibly overriding the first (for example customer request to increase the number or size of neutral grounding points for an increased safety margin).

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PWSlack
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United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

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Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
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#4

Re: Neutral Doubts

11/28/2012 7:17 AM

<...What is the minimum number of neutral grounding points on LV side?...>

The minimum number of neutral grounding points is 1. If it were less, the neutral wouldn't be grounded and so one would have an IT system.

<...Can the neutral grounding point be connected to Plant Ground mat?...>

Yes, if the local electrical code for this installation allows IT systems.

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