Table 5:
Relevant settings
Setting
Value
Remark
IdMin
0.20
20 % of IBase = 1000 A
Must be set above the maximum possible charging current (in this
example set to approximately 2 x of that value).
EndSection1
1.00
100 % of IBase = 1000 A
EndSection2
3.00
300 % of IBase = 1000 A
SlopeSection2
0.50
Slope = 50 %
SlopeSection3
1.00
Slope = 100 %
IdMinHigh
1.00
100 % of IBase = 1000 A
tIdMinHigh
1000
Interval of initial decreased sensitivity in ms.
IdUnre
3.00
300 % of IBase = 1000 A
Maximum through fault current calculated based on:
220
2.45
3 (4.84 58.64)
Through
I
kA
IECEQUATION15178 V1 EN-US
1.2
1.2 2.45
2.94
1
Through
dUnre
Base
I
kA
I
kA
I
kA
IECEQUATION15179 V1 EN-US
I2/I1Ratio
0.10
Ratio = 10 %
The value can be set this low because the 2
nd
harmonic block is
ignored if an internal fault is detected.
I5/I1Ratio
0.10
Ratio = 10 %
The value can be set this low because the 5
th
harmonic block is
ignored if an internal fault is detected and no tap transformer
exists in the protected zone.
CCCOpMode
1
The exact method with currents and voltages is used. Line
capacitances must be specified.
VTOnLineGrp1
0
VT is placed on the bus.
VTOnLineGrp2
0
VT is placed on the bus.
C0
7.751e-9 x 200
Total zero sequence capacitance of 220kV on a 200 km power line.
C1
12.74e-9 x 200
Total positive sequence capacitance of 220kV on a 200 km power
line.
NoOfLineEnds
2
Number of physical line ends in the protected zone (setting used
by charging current compensation).
NoOfCTSetsGrp1
1
Number of three-phase CT groups at first line end, the currents of
which are connected to input group 1 (setting used by charging
current compensation).
NoOfCTSetsGrp2
1
Number of three-phase CT groups at second line end, the currents
of which are connected to input group 2 (setting used by charging
current compensation).
IBase
1000
Nominal current of the protected power line.
NoOfUsedCTs
2
Total number of CT groups in the protected zone.
TapTransformer
0
Tap transformer not included in the protected zone (and its current
therefore not directly measured).
DiffMode
Master
Differential function activated.
1MRK 505 382-UEN E
Section 4
Analog and binary signal transfer for line differential protection
Communication set-up, 670/650 series
41
Application Guide
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Summary of Contents for Relion 670 series
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