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Ajoy Chatterjee
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Join Date: Apr 2009
Posts: 4

Grounding System for Substation

04/15/2009 12:18 PM

How should I design the grounding net work of a 33KV/415V ,50hz indoor substation?

Indoor Dimension:20mx20m.with concrete floor,soil resistivity 20ohm-m.

System description: 33kv supply from Sate Board will feed the 33KV inddoor sus-station.Source end is located at a distance of 5km from the indoor sub-station.No other details at source end is available.

Connected load details:-

A. 1.2MVA,33kv/570V ARC furnace transformer,Z%=5

2. HV: delta,LV1:star;LV2:delta

3.Vector group Dyn11 & Ddo

B. 1. Auxiliary transformer 33kv/415V,capacity 500kva;Z%=5;Dyn11,.

Note: Touch,step and mesh voltage should not be greater than the tolerable limit.

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North of 60
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Canada - Member - If there is a way to screw someting up, there is someone to do so! Safety - Hazmat - New Member

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#1

Re: Grounding System for Substation

04/15/2009 11:08 PM

By picking up the Yellow Pages and looking through them for a competent engineer. The kind of info you need will not be found here.

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Anonymous Poster
#2

Re: Grounding System for Substation

04/16/2009 12:28 AM

suggest purchase the earthing code published By Burro of Indian standards which will give you all the information you need good luck
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Current Maarey
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Join Date: Aug 2008
Location: East
Posts: 117
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#3

Re: Grounding System for Substation

04/16/2009 6:50 AM

Ajoy

Please go through the following to understand the subject.

1. IS-3043 Code for Earthing

2. IEEE - 80

3. IEEE - 142 Green Book

And as the volatge levels involved are very high it is recommended to hire a competent design engineer/ consultant.

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