28
.
0
1
097
.
0
151
.
0
2
1
1
2
1
1
0
R
R
R
R
L
E
IECEQUATION15052 V1 EN-US
(Equation 19)
Therefore, set this to 0.28.
XEoverXLZ1
: It provides zero sequence compensation for phase-to-earth faults.
83
.
0
1
112
.
0
298
.
0
2
1
1
2
1
1
0
X
X
X
X
L
E
IECEQUATION15053 V1 EN-US
(Equation 20)
Therefore, set this to 0.83.
RFPEFwZ1
: It should be set to give maximum coverage considering the arc
resistance and tower footing resistance.
Arc resistance = 2 Ohm primary and Tower footing resistance = 10 Ohm Primary.
Therefore,
RFPEFwZ1
should be minimum of 12 Ohm.
Since the
RFPEStart
is set to 50.16 Ohm to give more resistive coverage,
RFPEFwZ1
can be set at 0.8 x 50.16 = 40.13 Ohm. However, to avoid overreach
due to the remote end infeed, it is recommended that the resistive reach does not
exceed 4.5 times reactive reach.
Therefore,
RFPEFwZ1
may be set to 4.5 x
X1FwZ1
= 4.5 x 5.6 = 25.52 Ohm.
RFPPFwZ1
: It should be set to cover the arc resistance for phase-to-phase faults. It
may be set identical to
RFPEFwZ1
, which is 25.52 Ohm.
TimerSelZ1
: This is used to set the zone timer selection mode of zone 1. Set this to
Timers Separated
.
OpModetPEZ1
: Set this to
On
.
tPEZ1
: Set this to 0.0s.
OpModetPPZ1
: Set this to
On
.
tPPZ1
: Set this to 0.0s.
Zone 2
GUID-10817C37-30AB-4AC3-9EAF-670C89131237 v2
OpZ2
: Set this to
On
.
DirModeZ2
: This is used to set the zone 2 direction mode. Set this to
Forward
.
PhSelModeZ2
: This is used to enable the measuring loops of zone 2. Set this to
Phsel logic
.
LEModeZ2
: This is used to operate the load discrimination characteristic of zone 2.
Set this to
On
.
1MRK 506 375-UEN A
Section 7
Impedance protection
Railway application RER670 2.2 IEC
139
Application manual
Summary of Contents for RELION RER670
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