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Functions
Implementation In-
structions
Logic
6-76
In an ungrounded system, the reactive component of the current should be used to
determine the direction. In a grounded system, the real component of the current
should be used to determine the direction. Therefore, in an ungrounded system, ad-
dress should be set for 6,1 3+, measurement whereas in a grounded system,
address should be set for &26 3+, measurement.
Figure 6-34 illustrates the condition logic for the sensitive ground fault pickup. Ground
fault pickup may be switched 21 or 2)), or into $ODUP 2QO\ condition at address
6HQV *QG )DXOW. When ground fault protection is 21, tripping is possible.
The entire function may be blocked via a binary input. Switching off or blocking means
the measurement logic (shown in Figure 6-35) is deactivated, therefore, time delays
and messages are reset.
F# 1207
>BLK 50Ns/67Ns
" ÃTr†ÃBqÃAhˆy‡
6yh…€ÃPy’
PI
"1"
PAA
Figure 6-34
Activation of Sensitive Ground Fault Detection
Sens. Gnd block
Alarm Only
or
Reset Measurement Logic
&
C53000-G1140-C120-1
F# 1230
to Figure
6-35
F# 1211
50Ns/67Ns OFF
F# 1212
50Ns/67Ns ACT
7SJ63 Manual
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