Hitachi Relion 670 Series Applications Manual page 129
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Also See for Relion 670 Series:
- Applications manual (354 pages) ,
- Commissioning manual (284 pages) ,
- Product manual (192 pages)
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1MRK506375-UEN Rev. N
Stub line
ModeStubLine: Set this to Off.
7.2.4.2
Solidly earthed systems
Example in
transmission line. The earthing considered is solidly 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 45:
Table 16:
Parameter
System Voltage
System Frequency
Full load
Short time maximum Power
Minimum operating voltage
PT Ratio
CT Ratio
Line length A-B
Line length B-C
Positive sequence impedance of line
Zero sequence impedance of line
Arc resistance
Tower footing resistance
General
Common base IED values for primary current (IBase) and primary voltage (UBase) are set in a
Global base values for settings function GBASVAL.
GlobalBaseSel: To select a GBASVAL function for reference of base values.
IBase: Sets the base current in primary ampere. This is 50 MVA/110 kV = 454.54 A.
UBase: Sets the base voltage in kV. This is 110.0 kV.
Operation: Sets the protection to On/Off. Set this to On.
System Earthing: To select the type of system earthing. Select the Compensated.
LineAng: Set it to 50 deg.
IMinOpPE: To select the minimum operating current for the phase-to-earth loops. Set this to 10% IB.
Railway application RER670
Application manual
Figure 45
illustrates how the distance protection ZRWPDIS protects a 110 kV overhead
A
Line 1
Z<
Considered single line diagram
System Data
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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
100 km
0.097 + j0.112 Ohm/km = 0.1481 ∟ 49.3° Ohm/km
0.151 + j0.298 Ohm/km = 0.334 ∟ 63.13° Ohm/km
2 Ohm
10 Ohm
Section 7
Impedance protection
GUID-2A60F3E3-CA07-4FDA-B3F7-63CD471E202F v1
GUID-ED1D9B07-3EAF-436C-A6EA-044455DC168E v2
C
IEC15000385-1-en.vsdx
GUID-FB2EC166-F828-4760-93EC-D5FCDBA39657 v3
123
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