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
is inside the non-directional phase-to-ground
characteristic, the STNDZx output is set to TRUE.
RRNFwZx
RFFwPGZx
XXNFwZx
XXNRvZx
RFFwPGZx
RFRvPGZx
RFFwPGZx
RFRvPGZx
RFRvPGZx
R
X (Ohm/loop)
(Ohm/loop)
ANSI11000417-2-en.vsd
ι
N
X0FwPGZx X1FwPGZx
XNFwZx
3
,
<
R0FwPGZx R1FwPGZx
RNFwZx
3
,
<
ι
N
ι
N
XNRvZx XNFwZx
<
R1 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
Содержание Relion 670 series
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