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where,
I1
0
: Current in zero-sequence flowing at the local terminal1
I2
0
: Current in zero-sequence flowing at the remote terminal2
I3
0
: Current in zero-sequence flowing at the other remote terminal3
Figure 2.3-1 Zero-sequence current differential element (I
r0
-I
d0
Plane for DIFGL)
The DIFGL characteristic is identical to the DIFL characteristic for which is defined in
the small current region. The DIFGL characteristic is expressed using the following equations:
DIFGL-I
DIFGL-Slope
The user should set a minimum residual current for setting [DIFGL-I] for the occurrence
of a fault. The user should also set slope characteristic for setting [DIFGL-Slope].
(ii) Inflow current (I
in
) and Outflow current (I
out
) plain for DIFGL function
Figure 2.3-2 provides another expression corresponding to the Figure 2.3-1 characteristic; the
user can notice that the characteristic is expressed on the plane between the outflowing current
(I
out
) axis and inflow current (I
in
) axis. The element of the DIFGL function operates for the
hatched area on the I
out
–I
in
plain.
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