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Muthuvel
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Sizing of Neutral Earthing Strip

09/11/2012 3:01 AM

How to size the neutral earthing strip and number of earth pit for neutral earthing

ie)for example exercise 500kVA,430V power system
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PWSlack
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#1

Re: Sizing of neutral earthing strip.

09/11/2012 3:12 AM

One of the ways is to follow British Standard 7671.

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SavvyExacta
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#2

Re: Sizing of Neutral Earthing Strip

09/11/2012 7:15 AM

Try searching on CR4 - this question has been asked several times.

CR4 search: neutral earthing strip
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Muthuvel
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#3
In reply to #2

Re: Sizing of Neutral Earthing Strip

09/11/2012 7:46 AM

In CR4 there is no discussion for Neutral earth strip calculation.

The discussions what they did is only for body earthing strip calculations.
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electricalexpert65
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#4
In reply to #3

Re: Sizing of Neutral Earthing Strip

09/11/2012 10:02 AM

For 500kVA Transformer, the recommended Earth Strip Size for Neutral Earthing is:

i) 25mm x 6mm Bare Copper Strip

or

ii) 300 sq.mm PVC Insulated Aluminium Conductor

or

iii) 50mm x 6mm GI Strip
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Muthuvel
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#6
In reply to #4

Sizing of Neutral Earthing Strip

09/12/2012 12:47 AM

I know as per IS3043-1965 Annexure-D 25X6mm Cu strip or 300sq.mm Al Con

is recommended but I am asking the formula to Calculate the size .

I know the formula to size the body earthing meanwhile I need to know

formula for neutral earthing.
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electricalexpert65
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#7
In reply to #6

Re: Sizing of Neutral Earthing Strip

09/12/2012 9:26 AM

The Standard IS 3043 does not differentiate between a neutral earthing conductor and a body earthing conductor. As per the Standard, the formula for sizing earthing conductors & protective conductors is:

S = I Root 't' / K

where,

S is the cross sectional area of the protective conductor in sq.mm

I is the fault current is Amperes

t is the fault duration in seconds

K is the Adiabatic Constant depending upon the Material of the conductor, method of laying, etc. (given vide Table 6 of IS 3043).

By the by do not refer to IS 3043-1965.

This has been revised in 1987 and amended latest in january 2010.
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TonyS
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#5

Re: Sizing of Neutral Earthing Strip

09/11/2012 6:49 PM

As this is only an exercise does it realy matter?

You should do you're own research. You will learn so much more that constantly coming to CR4 to be given the answers. But you have been told this before.

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electricalexpert65 (2); Muthuvel (2); PWSlack (1); SavvyExacta (1); TonyS (1)

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