Earth Resistance Tester resistance measurement method
Release Time : 2017-02-17 View Count : 次For multi-point grounding systems (such as transmission system pole tower grounding,Earth Resistance Tester communication cable grounding systems, and some buildings, etc.),Earth Resistance Tester they are connected by an overhead ground wire (the shielding layer of the communication cable) to form a grounding system. When measured with a clamp meter,Earth Resistance Tester the equivalent circuit is as follows: where: R1 is the predicted ground resistance. R0 is the equivalent resistance of the grounding resistance of all other towers in parallel.
Although, from the strict grounding theory,Earth Resistance Tester due to the existence of the so-called "mutual resistance",Earth Resistance Tester R0 is not a parallel value in the usual electrical sense (it will be slightly larger than the parallel value in the electrical sense),Earth Resistance Tester but, Because the ground hemisphere of each tower is much smaller than the distance between the towers,Earth Resistance Tester and after all, the number of ground points is large,Earth Resistance Tester R0 is much smaller than R1. Therefore,Earth Resistance Tester R0=0 can be reasonably assumed from an engineering perspective. In this way,Earth Resistance Tester the resistance we measured should be R1. Multiple comparison experiments with traditional methods in different environments and on different occasions prove that the above assumptions are completely reasonable.