ABB RER670 Applications Manual page 146

Section 7
Impedance protection
140
LCModeZ2: This is used to enable/disable the adaptive load compensation mode of
zone 2. Set this to Off.
X1FwZ2: This is used to set the forward positive sequence reactance reach of zone
2 in Ohm/p. This should be set to 120% of line 1 reactance.
Therefore, set the X1FwZ2 to 1.2 x 50 x 0.112 = 6.72 Ohm.
REoverRLZ2: It provides zero sequence compensation for phase-to-earth faults.
 

R 1 R 1 . 0 151
      

E 0
1

 
R 2 R 2 . 0 097
L 1
IECEQUATION15052 V1 EN-US
Therefore, set this to 0.28.
XEoverXLZ2: It provides zero sequence compensation for phase-to-earth faults.
 

X 1 X 1 . 0 298
   
  

E 0
1

 
X 2 X 2 . 0 112
L 1
IECEQUATION15053 V1 EN-US
Therefore, set this to 0.83.
RFPEFwZ2: It should be set to give maximum coverage considering the maximum
permissible load.
Since the RFPEFwStart is set to 50.16 Ohm to give more resistive coverage,
RFPEFwZ2 can be set at 0.8 x 50.16 = 40.13 Ohm.
RFPPFwZ2: It may be set identical to RFPEFwZ2, which is 40.13 Ohm.
TimerSelZ2: This is used to set the zone timer selection mode of zone 2. Set this to
Timers Separated.
OpModetPEZ2: Set this to On.
tPEZ2: Choose a time delay for zone 2 with margin to assure selectivity to zone 1
of adjacent lines. A delay time difference of 0.4s between the zones is sufficient.
Therefore, the time delay for zone 2 can be set to 0.4s.
OpModetPPZ2: Set this to On.
tPPZ2: Set this identical to tPEZ2, which is 0.4s.
Zone 3
OpZ3: This is for operation Off/On of zone 3. Set this to On.
DirModeZ3: This is used to set the zone 3 direction mode. Set this to Forward.
PhSelModeZ3: This is used to enable the zone 3 measuring loops. Set this to Phsel
logic.

 

1 . 0 28


 

1 . 0 83

1MRK 506 375-UEN A
(Equation 21)
(Equation 22)
GUID-8B71CC5E-E130-44EC-A274-C76C780965A8 v2
Railway application RER670 2.2 IEC
Application manual