ABB RELION REB500 Applications Manual page 39

1MRK 505 403-UEN Rev. C
Table 19:
Function/ Parameter
Current Pick up
Minimum polarizing voltage
Characteristic Angle
Delay
Detection of high-resistance earth faults
Current enabling setting 3I0
Direction determined on basis of neutral variables (derived internally)
Permissive or blocking directional comparison scheme
Echo logic for weak infeeds
Logic for change of energy direction
Four independent parameter sets
Accuracies
Accuracy of the Current pick up setting
Accuracy of minimum polarizing voltage
Table 20: Inverse time earthfault overcurrent protection 51N (PTOC)
Function/ Parameter
Inverse time characteristic
(according to B.S. 142, IEC 60255-3 with extended setting
range):
normal inverse
very inverse
extremely inverse
long time inverse
or RXIDG characteristic
Number of phases
Base current I
Pick up current I
Min. time setting t
k setting
1
Response time without delay
Neutral current measurement (derived externally or internally)
Four independent parameter sets
Bay protection functions REB500
Application manual
Directional sensitive earthfault protection for grounded systems 67N (PDEF)
B
start
min
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BP-Additions to base documentation
Range/ Value
0.1 to 1.0 I in steps of 0.01 I
N
0.003 to 1 U in steps of 0.001 U
N
-90° to +90° in steps of 5°
0 to 1 s in steps of 0.001 s
Classes/ Value
±10% of setting
±5% of setting in the range of 0.1 to1 U
±0.005 U in the range of 0.006 to 0.1
N
U
N
Range/ Value
C
t = k / ((I/I ) - 1)
1 B
c = 0.02
c = 1
c = 2
c = 1
t = 5.8 - 1.35 x·l (I/I )
n B
1 or 3
0.04 to 2.5 I in steps of 0.01 I
N
1 to 4 I in steps of 0.01 I
B B
0 to 10 s in steps of 0.1 s
0.01 to 200 s in steps of 0.01 s
60 ms
Section 6
N
N
N
N
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