ABB REL670 Product Manual page 79

Line distance protection REL670 2.2
Product version: 2.2
Table 56. Thermal overload protection, one time constant LCPTTR/LFPTTR
Function
Reference current
Reference temperature
Operate time:
é
ê
-
2
I I
ê
t
=
t ln
-
ê
T
2 - 2 - Trip
I I
ê
p
ë T
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 57. 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
set
Additional time delay for a second back-up trip at 0
to 2 x I
set
Time delay for alarm for faulty circuit breaker
ABB
Range or value
(2-400)% of IBase
(0-300)°C, (0 - 600)°F
Time constant t = (1–1000)
minutes
ù
ú
2
ú
p
ú
T
Amb × 2
I
ú
ref
û
ref
(Equation 1)
ref
(0-200)°C, (0-400)°F
(0-300)°C, (0-600)°F
(0-300)°C, (0-600)°F
Range or value
(5-200)% of
> 95%
(2-200)% of
> 95%
(5-200)% of
> 95%
10 ms typically
15 ms maximum
(0.000-60.000) s
set
(0.000-60.000) s
set
(0.000-60.000) s
(0.000-60.000) s
(0.000-60.000) s
Accuracy
±1.0% of I
r
±1.0°C, ±2.0°F
IEC 60255-149, ±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
Accuracy
lBase
±1.0% of I at I £ I
r
±1.0% of I at I > I
-
lBase
±1.0% of I at I £ I
r
±1.0% of I at I > I
-
lBase
±1.0% of I at I £ I
r
±1.0% of I at I > I
-
-
-
±0.2% or ±15 ms whichever is greater
±0.2% or ±15 ms whichever is greater
±0.2% or ±20 ms whichever is greater
±0.2% or ±20 ms whichever is greater
±0.2% or ±15 ms whichever is greater
1MRK 506 372-BEN -
r
r
r
r
r
r
79