Hitachi Relion 670 Series Applications Manual page 127

1MRK506375-UEN Rev. N
X 1

E
X 2
L
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: 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 0.4 s between the zones is sufficient. Therefore, the time delay for zone 2
can be set to 0.4 s.
OpModetPPZ2: Set this to On.
tPPZ2: Set this identical to tPEZ2, which is 0.4 s.
Zone 3
OpZ3: For operation Off/On of zone 3. Set this to On.
DirModeZ3: To set the zone 3 direction mode. Set this to Forward.
PhSelModeZ3: To enable the zone 3 measuring loops. Set this to Phsel logic.
LEModeZ3: To operate the load discrimination characteristic of zone 3. Set this to On.
LCModeZ3: To enable/disable load compensation mode for zone 3. Set this to Off.
X1FwZ3: To set the forward positive sequence reactance reach for zone 3 in Ohm/p. This should be
set to 120% of reactance of (Line 1 + Line 2).
Therefore, set X1FwZ3 to 1.2 x (50 +100) x 0.112 = 20.16 Ohm.
REoverRLZ3: To provide zero sequence compensation for phase-to-earth faults.
R 1

E
R 2
L
IECEQUATION15052 V1 EN-US
Therefore, set this to 0.28.
XEoverXLZ3: To provide zero sequence compensation for phase-to-earth faults.
X 1

E
X 2
L
IECEQUATION15053 V1 EN-US
Therefore, set this to 0.83.
RFPEFwZ3: This may be set identical to setting RFPEFwZ2 which is 40.13 Ohm.
Railway application RER670
Application manual
 
 
X 1 . 0 298
   
  
 
0
1 1
 
 
X 2 . 0 112
1
 
 
R 1 . 0 151
       
 
0
1 1
 
 
R 2 . 0 097
1
 
 
X 1 . 0 298
   
  
 
0
1 1
 
 
X 2 . 0 112
1
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
. 0 83
. 0 28

. 0 83
Section 7
Impedance protection
(Equation 22)
GUID-8B71CC5E-E130-44EC-A274-C76C780965A8 v4
(Equation 23)
(Equation 24)
121