ABB RER670 - Page 145

28.01
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.
83.01
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