Limited Point Grounding System - ETCR ETCR2000+ Manual

measured should be R1.
Times of comparing tests in different environments and different
occasions with the traditional method proved that the above
assumption is entirely reasonable.

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
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:
1
+
R
1
1 1
+ +
R
R
2
3
1
+
R
2
1 1
+ +
......
R R
1 3
.
.
0
=
R
1T
1
+
......
R
N
=
R
2
T
1
+
R
N
-20-
regarded as 0, will yield