ABB RELION RED670 Series Product Manual page 89

Line differential protection RED670 2.2
Product version: 2.2
Table 58. Thermal overload protection, one time constant LCPTTR/LFPTTR
Function
Reference current
Reference temperature
Operate time:


2 , 2
I I

< σ p
t ln
,

T T
2 , Trip Amb
I

 T
ref
EQUATION13000039 V3 EN-US
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 59. 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




√ 2
I

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
M12352-1 v15
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
M12353-1 v14
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 505 379-BEN C
r
r
r
r
r
r
89