ABB Relion 670 Series Product Manual page 43

Busbar protection REB670
Customized
Product version: 1.2
Table 26. Thermal overload protection, two time constants TRPTTR
Function
Base current 1 and 2
Operate time:
æ ö
2 2
-
I I
p
ç ÷
= × t
t ln
ç ÷
2 2
-
I I
è ø
b
(Equation 1)
EQUATION1356 V1 EN
I = I
measured
Alarm level 1 and 2
Operate current
Reset level temperature
Table 27. Breaker failure protection CCRBRF
Function
Operate phase current
Reset ratio, phase current
Operate residual current
Reset ratio, residual current
Phase current level for blocking of contact function
Reset ratio
Timers
Operate time for current detection
Reset time for current detection
Table 28. Breaker failure protection, single phase version CCSRBRF
Function
Operate phase current
Reset ratio, phase current
Phase current level for blocking of contact function
Reset ratio
Timers
Operate time for current detection
Reset time for current detection
ABB
Range or value
(30–250)% of IBase
I = load current before overload
p
occurs
Time constant τ = (1–500)
minutes
(50–99)% of heat content trip
value
IBase
(50–250)% of
(10–95)% of heat content trip
Accuracy
± 1.0% of I
r
IEC 60255–8, ±5% + 200 ms
± 2.0% of heat content trip
± 1.0% of I
r
± 2.0% of heat content trip
Range or value
lBase
(5-200)% of
> 95%
lBase
(2-200)% of
> 95%
lBase
(5-200)% of
> 95%
(0.000-60.000) s
10 ms typically
15 ms maximum
Range or value
lBase
(5-200)% of
> 95%
lBase
(5-200)% of
> 95%
(0.000-60.000) s
10 ms typically
15 ms maximum
1MRK505273-BEN D
Accuracy
± 1.0% of I at I £ I
r r
± 1.0% of I at I > I
r
-
± 1.0% of I at I £ I
r r
± 1.0% of I at I > I
r
-
± 1.0% of I at I £ I
r r
± 1.0% of I at I > I
r
-
± 0.5% ±10 ms
-
-
Accuracy
± 1.0% of I at I £ I
r r
± 1.0% of I at I > I
r
-
± 1.0% of I at I £ I
r r
± 1.0% of I at I > I
r
-
± 0.5% ± 10 ms
-
-
43