Name
Values (Range)
Unit
Step
Default
Description
OpenCTEnable
Disabled
Enabled
-
-
Enabled
Open CTEnable Off/On
tOCTAlarmDelay
0.100 - 10.000
s
0.001
1.000
Open CT: time in s to alarm after an open CT
is detected
tOCTResetDelay
0.100 - 10.000
s
0.001
0.250
Reset delay in s. After delay, diff. function is
activated
Table 81:
LT6CPDIF (87LT) Non group settings (basic)
Name
Values (Range)
Unit
Step
Default
Description
NoOfTerminals
2
3
4
5
6
-
-
2
Number of current terminals of the protected
circuit
Chan2IsLocal
No
Yes
-
-
No
2-nd local current connected to input channel
2, Yes/ No
IBase
50.0 - 9999.9
A
0.1
3000.0
Base (reference) current of the differential
protection
ZerSeqCurSubtr
Disabled
Enabled
-
-
Disabled
Off/On for elimination of zero seq. from diff.
and bias curr
TraAOnInpCh
No Transf A
1
2
3
4
5
6
-
-
No Transf A
Power transformer A applied on input channel
X
RatVoltW1TraA
1.0 - 9999.9
kV
0.1
130.0
Transformer A rated voltage (kV) on winding
1 (HV winding)
RatVoltW2TraA
1.0 - 9999.9
kV
0.1
130.0
Transformer A rated voltage (kV) on winding
2 (LV winding)
ClockNumTransA
0 [0 deg]
1 [30 deg lag]
2 [60 deg lag]
3 [90 deg lag]
4 [120 deg lag]
5 [150 deg lag]
6 [180 deg lag]
7 [210 deg lag]
8 [240 deg lag]
9 [270 deg lag]
10 [300 deg lag]
11 [330 deg lag]
-
-
0 [0 deg]
Transf. A phase shift in multiples of 30 deg, 5
for 150 deg
ZerSeqPassTraA
No
Yes
-
-
No
Yes/No for capability of transf A to transform
zero seq curr
Table continues on next page
1MRK505222-UUS C
Section 5
Differential protection
159
Technical reference manual
Summary of Contents for Relion 670 series
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