Point to point ground impedance test
Point to point ground impedance test
(OP)
Do you recommend AC equipment or DC equipment for testing and why?
When was the last time you drove down the highway without seeing a commercial truck hauling goods?
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Point to point ground impedance test
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RE: Point to point ground impedance test
RE: Point to point ground impedance test
RE: Point to point ground impedance test
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Should answer your questions.
RE: Point to point ground impedance test
RE: Point to point ground impedance test
RE: Point to point ground impedance test
You are right. We can inject 100A DC current and measure voltage drop and use a shunt resistance to measure current to calculte the resistance of the connection points for point to point connectivity test of the grid.
RE: Point to point ground impedance test
RE: Point to point ground impedance test
If you are trying to determine if some or all of your substation equipent has a good connection to the ground grid or mat, the 100 amp injection test will not work due to possible multiple current paths.
The best method is to measure the absolute earth resistance of the ground mat using the three point fall of potential method and then measure the resistance of each piece of equipment to the ground mat using the direct method. Both tests are outlined in the 'Getting Down to Earth' paper and both are performed using a four terminal earth resistance test set which operates at 550 to 600 cyc. In this way you will be able to determine the absolute earth resistance of each piece of equipment.