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2.Limited Point Grounding System
This situation is also more common. For example, in some
towers, five towers are connected to each other through
overhead ground wires; for example, the grounding of some
buildings is not an independent grounding network, but several
grounding bodies are connected to each other through wires.
In this case, if the R0 in the above figure is regarded as 0,
it will bring a large error to the measurement result.
For the same reason as above, we ignore the influence of
mutual resistance, and calculate the equivalent resistance of the
grounding resistance in parallel with the calculation method in
the usual sense. In this way, for a grounding system with N
(smaller, but greater than 2) grounding bodies, N equations can
be listed:
Among them: R1, R2,....RN is the grounding resistance of the N
grounding bodies we require.
