Hitachi Relion 670 Series Applications Manual page 138

Section 7
Impedance protection
OpZ1
DirModeZ1
LEModeZ1
XFwZ1
XRvZ1
RFFwZ1
RFRvZ1
TimerStartZ1
tZ1
Zone 2 settings
Parameter name
OpZ2
DirModeZ2
LEModeZ2
XFwZ2
XRvZ2
RFFwZ2
RFRvZ2
TimerStartZ2
tZ2
Zone 3 settings
Parameter name
OpZ3
DirModeZ3
LEModeZ3
XFwZ3
XRvZ3
RFFwZ3
RFRvZ3
TimerStartZ3
tZ3
From settings in Table 17, the IED will operate as shown in Figure 46. Note that, all values are given
in primary ohms.
132
On To enable zone 1
Forward To look into the protected feeder
Off Load encroachment is not used
7.00 Ω As per calculated value for zone 1
7.00 Ω Use the same forward value because zone is directional
18.00 Ω As per calculated value for zone 1
22.00 Ω As per calculated value for zone 1
Own zone Z1 timer triggered by its own start
0.000 s As per calculated value for zone 1
Value Comment
On To enable zone 2
Forward To look into the protected feeder
Off Load encroachment is not used
24.00 Ω As per calculated value for zone 2
24.00 Ω Use the same forward value because zone is directional
14.00 Ω As per calculated value for zone 2
18.00 Ω As per calculated value for zone 2
Own zone Z2 timer triggered by its own start
0.250 s As per calculated value for zone 2
Value Comment
On To enable zone 3
Non-directional To cover both the feeder and the busbars
Off Load encroachment is not used
30.00 Ω As per calculated value for zone 3
2.00 Ω As per calculated value for zone 3
14.00 Ω As per calculated value for zone 3
18.00 Ω As per calculated value for zone 3
Own zone Z3 timer triggered by its own start
0.500 s As per calculated value for zone 3
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1MRK506375-UEN Rev. N
Railway application RER670
Application manual