Is there a way around High GPR
Is there a way around High GPR
(OP)
Claculation shows that GPR is 11000V , very high fault current which is around 28000A.
Step and touch potentials are fine and within limits. would this cause a serious damage to the equipments?
Step and touch potentials are fine and within limits. would this cause a serious damage to the equipments?






RE: Is there a way around High GPR
RE: Is there a way around High GPR
What if we use fiber optics for communications?
RE: Is there a way around High GPR
RE: Is there a way around High GPR
RE: Is there a way around High GPR
http://www.positronpower.com/en/
The telco will be concerned about GPR as a safety issue.
Use of fiber for data and phone lines can certainly reduce some of the concerns.
David Castor
www.cvoes.com
RE: Is there a way around High GPR
any idea how this can be calculated?
RE: Is there a way around High GPR
If you have a GPR of 11,000 volts, your zone of influence probably covers the whole county.
Are you sure that you are accounting for ground fault return current flowing in neutrals or shield wires instead of through the earth? If your grid resistance is 0.4 ohms and half of the fault current returns to the source through a metallic neutral conductor, then the GPR is only (1-0.5)·28000·0.4 = 5,600 volts.
RE: Is there a way around High GPR
"
Are you sure that you are accounting for ground fault return current flowing in neutrals or shield wires instead of through the earth? If your grid resistance is 0.4 ohms and half of the fault current returns to the source through a metallic neutral conductor, then the GPR is only (1-0.5)·28000·0.4 = 5,600 volts."
CYMGRD doesnt give me the option of choosing how the return current goes back to source!!
RE: Is there a way around High GPR
This will lower you GPR as jghrist has described, but each site is different and should be calculated.
RE: Is there a way around High GPR
According to the CYMGRD brochure, it computes Rg and
RE: Is there a way around High GPR
David Castor
www.cvoes.com