The calculated
R
calc
and
X
calc
are compared with the non-directional phase-to-ground quadrilateral
characteristics defined by the reactance reaches (
X1FwPEZx
or
X1RvPEZx
, where
x
= 1 to 5 or RV),
resistance reaches (
R1RwPEZx
, where
x
= 1 to 5 or RV) for the zones, as well as the fault resistance
reach setting for phase-to-ground loops ((
RFPEZx
, where
x
= 1, 2 or RV), (
RFFwPEZx
and
RFRvPEZx
,
where
x
= 3 to 5)), as shown in Figure 173. If is inside the non-directional phase-to-ground
characteristic, the STNDZx output is set to TRUE.
R1FwPGZx+RNFwZx
RFFwPGZx
X1FwPGZx+XNFwZx
X1RvPGZx+XNRvZx
RFFwPGZxRFRvPGZx
RFFwPGZx
RFRvPGZx
RFRvPGZx
R
X (Ohm/loop)
(Ohm/loop)
ANSI11000417-2-en.vsd
ι
N
X0FwPGZx X1FwPGZx
XNFwZx
3
,
<
R0FwPGZx R1FwPGZx
RNFwZx
3
,
<
N
XNRvZx XNFwZx<
R1RvPGZx + RNRvZx
RNRvZx RNFwZx<
1)
1)
1)
Settings RFRvPGZx and RFFwPGZx exists for Zones 3 to 5.
For Zone 1, 2 and RV, setting RFPGZx is applicable for both forward and reverse direction.
R1RvPGZx R1FwPGZx <
√
√
√
X1RvPGZx
X1FwPGZx
X1RvPGZx
X1FwPGZx
X1RvPGZx
X1FwPGZx
ANSI11000417 V2 EN-US
Figure 173: ZMFCPDIS Characteristic for phase-to-ground measuring loops, ohm/loop
domain
Section 7 1MRK 502 066-UUS B
Impedance protection
346
Technical manual
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