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sauravbabu
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Engineering Fields - Electrical Engineering - New Member

Join Date: Dec 2009
Posts: 247

Static Excitation System n-1 Critrion.

12/26/2011 5:03 AM

Hi,

If the following could be explained:

"The rectifier assembly shall consist of two or more individual bridges (2x100%, 3x50%) fulfilling the n-1 criterion. The system shall supply the nominal excitation current at rated generator conditions with one bridge out of service. The thyristor bridges shall be 50% loaded."

Q1. what is n-1 criterion?

Q2. what is (2x100%, 3x50%)?

Regards,

Saurav Kafle.
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Tornado
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Technical Fields - Technical Writing - New Member Engineering Fields - Piping Design Engineering - New Member

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Location: Richland, WA, USA
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#1

Re: static excitation system n-1 critrion.

12/26/2011 5:13 AM

N-1 means that if you lose one, the remainder still suffice. In your two examples:
a) with two 100% bridges, loss of one still leaves the other one at 100%.
b) with three 50% bridges, loss of one still leaves 2 x 50% = 100%.

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pwr2thepeople
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#2
In reply to #1

Re: static excitation system n-1 critrion.

12/27/2011 3:28 PM

GA, Tornado. Clear and concise.

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