Hitachi Relion 670 Series Applications Manual page 123

1MRK506375-UEN Rev. N
OpModetPPZ6: To set the Off/On operation of the phase-to-phase timer of zone 6. The default
setting is Off.
tPPZ6: To set the time delay to trip for phase-to-earth faults in zone 6. It should be set to 0.0 s.
Phase Selection
tI0: Delay time for the residual overcurrent start. Residual overcurrent start is delayed by settable
time delay tI0. The default setting is 0.2s.
ModeU0DetMin: To enable/disable the neutral voltage shift protection. The default setting is Off.
U0DetMin: To set the minimum operate value for the neutral voltage shift. The default value is 20%
UB.
UDisp
OpModeU0: For the Off/On operation of the neutral voltage displacement logic. The default value is
Off.
UMinDisp: To check the neutral voltage displacement for single phase-earth-faults occur in the
system. The default setting is 150% UB.
tU0: This is the time delay to trip for the neutral voltage displacement start. The default value is 5.0s.
7.2.4 Setting examples
7.2.4.1 Compensated earthed systems
Example in Figure
transmission line. The earthing considered is compensated earthed system.
Out of the six distance protection zones, only the zone 1, zone 2 and zone 3 are considered in this
example. Zones 4, 5 and 6 can be set on similar lines depending on the application they are being
used.
All the settings for impedance are in Ohms Primary.
IEC15000385 V1 EN-US
Figure 44:
Table 15:
Parameter
System Voltage
System Frequency
Full load
Short time maximum Power
Minimum operating voltage
PT Ratio
CT Ratio
Line length A-B
Table continues on next page
Railway application RER670
Application manual
44 illustrates how the distance protection ZRWPDIS protects a 110 kV overhead
A
Line 1
Z<
Considered single line diagram
System Data
© 2017 - 2023 Hitachi Energy. All rights reserved
B
Line 2
Value
110 kV
16.7 Hz
50 MVA
250% of Full load
90% of rated voltage
110 kV/110 V
600/1 A
50 km
Section 7
Impedance protection
GUID-62310709-49F4-4D60-869C-2145D574B459 v3
GUID-1885B794-9F95-446B-A656-0A37AAB7F193 v3
GUID-C9010253-2D63-485B-ACF9-48166C03E017 v3
C
IEC15000385-1-en.vsdx
117