ABB REB670 - Page 38

Differential protection
Table 24. Busbar differential protection
Function Range or value Accuracy
Operating characteristic S=0.53 fixed ± 2.0% of I
r
for I < I
r
± 2.0% of I for I > I
r
Reset ratio > 95% -
Differential current operating level (1-100000) A ± 2.0% of I
r
for I < I
r
± 2.0% of I for I > I
r
Sensitive differential operation
level
(1-100000) A ± 2.0% of I
r
for I < I
r
± 2.0% of I for I < I
r
Check zone operation level (0-100000) A ± 2.0% of I
r
for I < I
r
± 2.0% of I for I > I
r
Check zone slope (0.0-0.9) -
Timers (0.000-60.000) s ± 0.5% ± 10 ms
Timers (0.00-6000.00) s ± 0.5% ± 10 ms
Operate time 19 ms typically at 0 to 2 x I
d
12 ms typically at 0 to 10 x I
d
-
Reset time 21 ms typically at 2 to 0 x I
d
29 ms typically at 10 to 0 x I
d
-
Critical impulse time 8 ms typically at 0 to 2 x I
d
-
Busbar protection REB670
1MRK505212-BEN E
Pre-configured
Product version: 1.2
38 ABB