ABB Relion REB500, Product Manual, Page: 38 / 50

Distributed busbar protection REB500 1MRK 505 352-BEN
Product version: 8.2 Issued: 2016-03-01
Revision: -
38 ABB
Table 29. Overcurrent Protection 51 (PTOC)
Function/ Parameter Range/ Value Accuracy
Characteristic definite time
-
Operate current 0.1 to 20 x I
N
in steps of 0.1 x I
N
±5% of I
N
at I
set
< I
N
±5% of I
set
at I
set
³
I
N
Time delay 10 ms to 20 s in steps of 10 ms
-
Reset ratio 95%
±4% of I
N
at I
Set
< I
N
-±1% of I
Set
at I
Set
³
I
N
Reset time
20 to 50 ms at I
k
= 1.2 – 20 x I
N
for f
N
= 50, 60 Hz
-
Table 30. Breaker pole discrepancy 51/62PD (PTOC)
Function/ Parameter Range/ Value Accuracy
Operate current
0.1 I
N
to 2.0 x I
N
in steps of 0.1 x I
N
, ±5% of I
N
at I
Set
< I
N
±5% of I
Set
at I
Set
³
I
N
Time delay
100 ms to 10000 ms in steps of 100 ms
-
Discrepancy factor 0.01 to 0.99 x I
max
in steps of 0.01 x
I
max
-
For feeders with single phase tripping and autoreclosure, the time setting for the breaker pole discrepancy protection
must be greater than the reclosure time. The discrepancy factor is the maximum permissible difference between the
amplitudes of two phases.
Table 31. Current release criterion 51 (PTOC)
Function/ Parameter Range/ Value Accuracy
Operate current 0.1 to 4.0 x I
N
in steps of 0.1 x I
N
±5% of I
N
at I
Set
< I
N
±5% of I
Set
at I
Set
> I
N
The current release criterion only allows the trip of a circuit breaker if the feeder current value is above the setting value
of the enabling current. This value can be individually selected for each bay.
Table 32. Voltage release criteria 27/59 (PTOV/PTUV)
Function/ Parameter Range/ Value Accuracy
Operate voltage U< 0.2 to 1.0 x U
N
in steps of 0.05 x U
N
±5% of U
N
Operate voltage U
0
> 0.1 to 1.0 x U
N
in steps of 0.05 x U
N
±5% of 0.2 U
N
at U
Set
< 0.2 U
N
±5% of U
Set
at U
Set
> 0.2 U
N
If the voltage release criteria are not activated the tripping command (“21110_TRIP”) is given independent from voltage
(standard setting).
The voltage release criteria are used as additional criteria for busbar protection (as well as for the other station
protection functions) and operates per zone. They can be used as U< or U
0
> or in combination.