Touch voltage calculation 1

[james64]

Hello my friends,

I am struggling to calculate touch, step and GPR according to IEEE std 80, 2000.

soil resistance: 2500 OHM*M
fault current : 10kA
current division factor : 20%

Can I calculate standard and calculation values above without using software ?
The result is quite strange to me, I am wodering now. While calculating, I do not how to figure out surface layer deration factor(Cs), irregularity factor(Ki=0.644+0.148n). What is the differnce rho and (rho)_s in the Cs equation. Is Ki equation only one?

Thanks
James

 

[7anoter4]

I think I have an excel workbook -I don't well remember, but may be by courtesy of cuky2000.

 

[james64]

Hello 7anoter4

Thank for your great information. It was very useful to solve my problem.

James

 

[james64]

Hello friends,
After calculating the step and touch voltage, the touch is higher than step voltage. As far as I know, step voltage should be higher than touch voltage. What am I missing now?
I highly appreciated if you comment about that.