ABB Relion 670 series Product Manual page 51

ABB
Line distance protection REL670 ANSI
Pre-configured
Product version: 1.2
Table 34. Thermal overload protection, one time constant LPTTR (26)
Function
Reference current
Reference temperature
Operate time:
æ ö
2 2
-
I I
p
t ç ÷
= ×
t ln
ç ÷
2 2
-
I I
è ø
b
(Equation 1)
EQUATION1356 V1 EN
I = actual measured current
I = load current before overload
p
occurs
I = base current, IBase
b
Alarm temperature
Trip temperature
Reset level temperature
Table 35. Breaker failure protection CCRBRF (50BF)
Function
Operate phase current
Reset ratio, phase current
Operate residual current
Reset ratio, residual current
Phase current pickup for blocking of
contact function
Reset ratio
Timers
Operate time for current detection
Reset time for current detection
Range or value
IBase
(0-400)% of
(0-400)°C
Time constant t = (0–1000)
minutes
(0-200)°C
(0-400)°C
(0-400)°C
Range or value
(5-200)% of lBase
> 95%
(2-200)% of lBase
> 95%
lBase
(5-200)% of
> 95%
(0.000-60.000) s
10 ms typically
15 ms maximum
1MRK 506 317-BUS A
Accuracy
± 1.0% of I
n
± 1.0°C
IEC 60255-8, class 5 + 200 ms
± 2.0% of heat content trip
± 2.0% of heat content trip
± 2.0% of heat content trip
Accuracy
± 1.0% of I at I £ I
n
± 1.0% of I at I > I
-
± 1.0% of I at I £ I
n
± 1.0% of I at I > I
-
± 1.0% of I at I £ I
n
± 1.0% of I at I > I
-
± 0.5% ±10 ms
-
-
n
n
n
n
n
n
51