Earthing transformer
When the system neutral may not available, earthing transformer may be used to obtain the neutral. The neutral point of transformer to the earth ground network provides a reference point of zero volts.
This spreadsheet calculates the following parameters of a neutral earthing transformer:
- Total capacitive charging current (It).
- Neutral earthing transformer secondary current.
- Required grounding resistor value at primary side (Rp).
- Required resistance value at secondary side (Rsec).
- Neutral earthing transformer X/R Ratio
- Fault current through neutral – single line to ground fault (If)
- Rating of neutral earthing transformer (P).
It might be interesting to read technical article about all types of neutral earthing in power distribution: Part 1 and Part 2.
| Software: | MS Excel Spreadsheet to calculate the size of neutral earthing transformer |
| Version: | – |
| Developer: | Jignesh Parmar |
| Size: | 92 KB |
| Price: | Free |
| Download: | Right here | Video Courses | Membership | Download Updates |
Could you please send the earthing transformer sizing spread sheet
thank you a lot.
Excellent work on the NGT sizing calculator. Do you have Low resistance Neutral grounding resistor sizing spread sheet? If so please send the file to [email protected]
Thank you, nice work!!
Please kindly check the work EARTHING, it should be EARTHLING for engineering pronounce
so please make amend.
Thanks
Truly
Dear Mr. Jignesh,
From talk in your papers, it appears that you are talking sizing of Transformer for floating 3 phase system, but from spread sheet it appears, for single phase Grounding Transformer, for gounding 3 phase start connected Power Supply source with star point and star point of source grounded using 1 phase transformer with secondary Burdened via Resistance. Otherwise for floating system, it shall be 3 phase transformer or a 3 phase Reactor with impedence to limit phase to earth fault current to neutral. In case of 3 phase Transformer, it shall be Y-open delta (Say Y for floating system and open delta for , with Open Delta shorted via resistance to burden Primay in case of Earth Fault and Start of Primary solidly grounded. Your work sheet seems not correct, suggest review with Application of Earthing Transformer and fault current, giving system configuration in which you have designed the work sheet and details of Transformer connection etc. In all cases however, we can not size the Earthing Transformer on basis of charging system capacitance or giving short circuit path of Capacitive Current for 1 phase to earth fault. According to me it needs review.
Best regards
Ramesh Kapur
Good morning Mr jignesh, i van not download the sheet. Can you send to my e-mail please: [email protected]
Good morning Mr jignesh, i van not download the sheet. Can you send to my e-mail please: edsonfrancisco [email protected]
sir what is the password to unprotect the workbook?
what is maximum amperage rating for 3 phase 100KVA transformer at continue load?
Well, i got it. Thanks sir.
am unable to download please send the sheet to [email protected]
Good day sir
I have not yet used the spread sheet but is it able to calculate size of grounding wire of 3 phase transformers.
Neutral to earth voltage is increasing from mV (no load) to 4V when the high pressure pumps are working ( total load reaches to 630 KW ).and the neutral current is 14 amps .Do u have any solution for the above .Using Generator for the source
Will be fixed very soon, please be patient… Tnx!
I am unable to download the sheet.
Can you kindly send the same to me at my email address
Try now, it’s fixed.
I am unable to download the sheet.
Can you kindly send the same to me at my email address
Try now, it’s fixed.
I am unable to download the sheet.
Try now, it’s fixed.
Sir, thanks for upload. How do you determine the transformer overloading factors?
Did you follow any standards? Please reply…
I am unable to download the sheet.
Can you kindly send the same to me at the following address.
[email protected]
with best regards
ugyen thinley
Try now, it’s fixed.
how to download, please give idea to download ur spread sheet
Dear Mr. Jignesh.
I am unable to download the sheet.
Can you kindly send the same to me at the following address.
[email protected]
regards
Deepak