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manish_shah
Participant

Join Date: Jan 2009
Posts: 2

Earthing Calculations

01/06/2009 10:48 AM

Dear all,I will have to make earth mat calculation for earthing of the Laddle Refining Furnace containing control panel, Desk, H.T System (VCB,ISOLATOR,TRANSFORMER),

How to make earthing, how to calculate it & what material i can for it?

Please give me some guidance for the same
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user-deleted-13
Guru

Join Date: Sep 2006
Posts: 4513
Good Answers: 88
#1

Re: How to earth?

01/06/2009 2:03 PM
  • Recommended Practice for Powering and Grounding Sensitive Electronic Equipment: IEEE Emerald Book, Standard 1100-1999 (or latest edition), IEEE, New York, NY.
    www.IEEE.org
  • Recommended Practice for Grounding of Industrial and Commercial Power Systems: IEEE Green Book, Standard 142- 1992 (or latest edition) , IEEE, New York, NY.
  • National Electrical Code, NFPA 70, National Fire Protection Ass'n., Quincy, MA, (latest edition).
    www.NFPA.org
  • IAEI Soares Book on Grounding, International Association of Electrical Inspectors, Richardson, TX, (latest edition).
    www.IAEI.org
  • Code for Protection Against Lightning, NFPA 780, (latest edition).
    www.NFPA.org
  • Grounding and Lightning Protection, Robinson, M. D., Publication No. EL-5036, Electric Power Research Institute, Palo Alto, CA, 1987. (Available to members only).
    www.EPRI.com
  • Lightning Protection Systems, Pub. No. 96A, Underwriters Laboratories Inc., Northbrook, IL.
    www.UL.com
  • Dranetz Field Handbook for Power Quality Analysis, Dranetz Technologies, Edison, NJ, 1991.
    www.dranetz-bmi.com
  • EC&M Practical Guide to Quality Power for Sensitive Electronic Equipment, DeDad, John and Waggoner, Ray, Intertec Publishing, Overland Park, KS, (latest edition).
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CJMcGill
Guru

Join Date: Jul 2008
Location: SoCal USA
Posts: 556
Good Answers: 23
#2
In reply to #1

Re: How to earth?

01/06/2009 3:56 PM

A plethora indeed!

This leaves me wondering if there is not a deficiency of search engine availability in India and other countries. Hmmm.

__________________
 I do not 'know it all', but i will admit that I would like to. CJM
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Anonymous Poster
#3

Re: Earthing Calculations

01/09/2009 1:19 AM

Dear Sir,

How to do earthing:

Decide the earth conductor (Type of material & size) for earth mat and risers. Lay atleast 0.650 mm from the mother earth. (Natural Ground Level).

Install the risers to the equipment and the equipment support structure.

Provide risers for all cable trays, Control & Relay Panel, LV Service Equipemnt, Marshalling Kiosks, Junction Box.

If any doubt please revert.

Best Regards,

N.Suresh
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manish_shah
Participant

Join Date: Jan 2009
Posts: 2
#5
In reply to #3

Re: Earthing Calculations

01/09/2009 4:20 AM

Thanks for your reply,

Now i would like to tell you following

My system is of following prt

(1) H.T. System

Contains 33 KV VCB, / 120 to 240 V- 11MVA Furnace DutyTransormer, 33 KV 1250A wall mounted Isolator & 30 KV lightning Arrestors (3 Nos.).

(2) L.T System

Like, PLC base Control Panel, Control Desk & MC.C.

Now sugest me that how can I differenciate the above earthing and what material should I use either M.S. or Copper?
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Life2k
Active Contributor

Join Date: Nov 2008
Location: Based in Dubai ! Love life.
Posts: 16
#4

Re: Earthing Calculations

01/09/2009 2:28 AM

How to do Earth Mat Calculation:

Find out how much is the Fault Current that the earth mat is to be designed for.

Find out % Impedence of the transformer.

Find our Soil Resistivity as per Wenner 4 Pin method.

Once you have this, Earthing Calculation can be done.

Earth.dxb@gmail.com

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electricaleng
Commentator

Join Date: Aug 2011
Posts: 76
#6
In reply to #4

Re: Earthing Calculations

08/24/2011 2:03 AM

CR4 ADMIN: Deleted Post

Spam: This post was deleted because it contained advertising outside the Commercial Space forum. Please review Section 14 of the CR4 Site FAQ about advertising.
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Users who posted comments:

Anonymous Poster (1); CJMcGill (1); electricaleng (1); Life2k (1); manish_shah (1); user-deleted-13 (1)

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