fault type has an associated value, which represents the corresponding zone measuring
loop to be released. The values are presented in table 140.
0= no faulted phases
1= AG
2= BG
3= CG
4= -ABG
5= -BCG
6= -CAG
7= -ABCG
8= -AB
9= -BC
10= -CA
11= ABC
An additional logic is applied to handle the cases when phase-to-ground outputs are to
be asserted when the ground input G is not asserted.
The output signal PLECND is activated when the load encroachment is operating.
PLECNDis connected to the input STCND for selected quadrilateral impedance
measuring zones to be blocked. The signal must be connected to the input LDCND for
selected mho impedance measuring zones .
The load encroachment at the measuring zone must be activated to
release the blocking from the load encroachment function.
6.8.3 Function block
ANSI06000429-2-en.vsd
FMPSPDIS
I3P*
V3P*
BLOCK
ZSTART
TR3PH
1POLEAR
PU_A
PU_B
PU_C
PHG_FLT
PHSCND
PLECND
DLECND
PICKUP
ANSI06000429 V2 EN
Figure 155: FMPSPDIS (21) function block
1MRK505222-UUS C Section 6
Impedance protection
301
Technical reference manual
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