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2. Limited Point Grounding System
This is also quite common. For example, in some towers, five towers are
linked with each other through overhead ground wire; Besides, the grounding
of some of the buildings is not an independent grounding grid, but several
grounding bodies connected with each other through the wire.
Under such circumstances, the above R
0
regarded as 0, will yield more error
on the results of the measurement.
Due to the same reasons mentioned above, we may ignore the impact of the
mutual resistance; and the equivalent resistance of the grounding resistance
paralleled is calculated by the usual sense. Thus, for the grounding system of
N (N is smaller, but larger than 2) grounding bodies, it can offer N equations:
.
.
.
Where: R1, R2, ……R
N
are grounding resistances of N grounding bodies.
R
1T
,R
2T
,……R
NT
are the resistances measured with the Meter in the
different grounding branches.
It is nonlinear equations with N unknown numbers and N equations. It indeed
has a definite solution, but it is very difficult to solve the issue artificially, even
impossible when N is larger.
Therefore, you’re expected to buy the Limited-Point Grounding System
Solution software produced by this Company. Users can use the office
computer or notebook computer to carry out solutions.
NT
N
N
R
R
R
R
R
)
1
(
2
1
1
......
1
1
1
R
1
T
R
N
R
3
R
2
R
1
1
......
1
1
1
T
N
R
R
R
R
R
2
3
1
2
1
......
1
1
1
