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Category Archives: Ground Potential Rise
How do you ground a 120-ft tower on top of solid granite?
Hi Craig, Thank you for your question regarding electrical grounding on top of granite rock, it is our pleasure to help. This is one of the biggest questions we ever get, how do you ground on top of a rock … Continue reading
What is accepted limits of GPR and GPD? How do you protect Telephone circuits from high GPR and GPD?
Hi Chander, Thank you for your question regarding GPR and GPD acceptable limits. It is our pleasure to help. There are actually no specified limits to either of these electrical phenomena’s, as they are simply indicative factors for other specifications. … Continue reading
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Is there a minimum separation established between a Data Center and a 115KV Substation. There is a concern about the EMI to the servers, routers, etc. The Ground Potential Rise in a Data Center adjacent to a 115KV Substation is 809V, is that ok or too high?
Hi Hugo, Ben, Bhimesh, Thank you for your question regarding Ground Potential Rise (GPR) on a data center, it is our pleasure to help. Data Center’s are big energy consumers, and as such they often have substations and generators located … Continue reading
In substation, often LV and HV, grounds and neutral of transformer or other instrument are connecting to one meshy network. Sometimes when lightening or other phenomenona like that occurs the LV instruments are destroyed. How can I resolve this problem and how can I know about the new method for grounding in substation? LV and HV, grounds and neutral should be connecting to one ground grid or no? is it any standard for connecting or separating grounds in substation?
Hi Moshen, Thank you for your question regarding LV and HV grounding at substations, it is our pleasure to help. You may not have separate grounding systems at any location, particularly at substations. It would be very hazardous and would … Continue reading
What is step potential and why is it important to tie all systems together?
Hi Robert, Thank you for your question regarding Step Potentials (Voltage) and bonding, it is our pleasure to help. Step and Touch Potentials are hazardous electrical voltages that form when electrical energy enters the earth, typically (but not exclusively) during … Continue reading
We excuting 220KV Switchyard in Gujrat India. I have required test/measurment method for step and touch voltage . Plz given me a method.
Hi Sandeep, Thank you for your question regarding the measurement of Step & Touch Voltage Hazards at a 220kV substation. It is our pleasure to help. Hazardous Step & Touch Voltages can be created a number of ways. In a … Continue reading
When disconnecting an 11,000 volt Elecrtrical motor, should the HV supply cable be earthed or not (at the substation) when the HV VCB is racked to the isolated position? I have concerns if a HV fault occures & the HV supply cable is earthed the potential at the disconnected end of the HV cable will rise to an unsafe level.
Hi Daryl, Thank you for your question regarding proper grounding procedures for high-voltage and high-current motors. It is our pleasure to help. While it would be impossible to give accurate advice to anyone without seeing schematics and the motor specifications, … Continue reading
Is using CDEGS for design of the substation earthing system economically more beneficial compared to using IEEE80 formulas? I mean can I reduce the used copper and justify it or not?
Hi Keivan, Thank you for your question regarding substation design using CDEGS and IEEE Std-80 formulas. It is our pleasure to help. IEEE Std-80 is the IEEE Guide for Safety in AC Substation Grounding. It was originally published in 1961 … Continue reading
I have this great new product that is nearly as conductive as copper, can I simply add a few conductors and use it on my substation ground grid?
It sounds like you have a really excellent product, however you cannot simply add a few conductors and ground rods to make up for the difference in material. The change in materials in the grounding system will impact the propagation … Continue reading
Should the Earthing System of PLC or Communication Rooms in High Voltage / Transmission Substations be electrically seperated from other parts of the Substation? Please reference the standards.
Hi EA Jamshidi, Thank you for your question regarding the standards requiring PLC’s and communication equipment at utility substations to be bonded to the same ground potential. It is our pleasure to help. We see in your original question that … Continue reading