ABB RED670 Product Manual page 72

Line differential protection RED670 2.1 IEC
Product version: 2.1
Table 54. Thermal overload protection, one time constant LCPTTR/LFPTTR
Function
Reference current
Reference temperature
Operate time:
é
ê
-
2 2
I I
ê
t
= p
t ln
-
ê
T
2 - 2 - Trip
I I
ê
p
ë T
ref
EQUATION13000039 V2 EN
T = set operate temperature
Trip
T = ambient temperature
Amb
T = temperature rise above ambient at I
ref
I = reference load current
ref
I = actual measured current
I = load current before overload occurs
p
Alarm temperature
Operate temperature
Reset level temperature
Table 55. 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
Operate time for current detection
Reset time for current detection
Time delay for re-trip at 0 to 2 x I
Time delay for back-up trip at 0 to 2 x I
Time delay for back-up trip at multi-phase start at 0 to 2 x I
Additional time delay for a second back-up trip at 0 to 2 x I
Time delay for alarm for faulty circuit breaker
72
Range or value
(2-400)% of IBase
(0-300)°C, (0 - 600)°F
Time constant t = (1–1000)
minutes
ù
ú
ú
ú
T
Amb × 2
I
ú
ref
û
(Equation 1)
ref
(0-200)°C, (0-400)°F
(0-300)°C, (0-600)°F
(0-300)°C, (0-600)°F
set
set
set
set
Accuracy
±1.0% of I
r
±1.0°C, ±2.0°F
IEC 60255-8, ±5.0% or ±200 ms whichever is greater
±2.0°C, ±4.0°F
±2.0°C, ±4.0°F
±2.0°C, ±4.0°F
Range or value
lBase
(5-200)% of
> 95%
(2-200)% of lBase
> 95%
lBase
(5-200)% of
> 95%
20 ms typically
25 ms maximum
(0.000-60.000) s
(0.000-60.000) s
(0.000-60.000) s
(0.000-60.000) s
(0.000-60.000) s
1MRK 505 346-BEN -
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
-
-
-
±0.2% or ±30 ms whichever is
greater
±0.2% or ±30 ms whichever is
greater
±0.2% or ±35 ms whichever is
greater
±0.2% or ±35 ms whichever is
greater
±0.2% or ±30 ms whichever is
greater
ABB