Hitachi Relion 670 Series Product Manual page 106

Line differential protection RED670
Version 2.2
Table 65. 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 66. 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 retrip at 0 to 2 x I
Time delay for backup trip at 0 to 2 x I
Time delay for backup trip at multi-phase start at 0
to 2 x I
set
Additional time delay for a second backup trip at 0
to 2 x I
set
Time delay for alarm for faulty circuit breaker
Minimum trip pulse duration
* Valid for product version 2.2.3 or later
106
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 lBase
> 95%
(2-200)% of lBase
> 95%
(5-200)% of lBase
> 95%
10 ms typically
10 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
(0.010-60.000) s
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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 v15
Accuracy
at I £ I
±1.0% of I
r
±1.0% of I at I > I
-
at I £ I
±1.0% of I
r
±1.0% of I at I > I
-
at I £ I
±1.0% of 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
±0.2% or ±5 ms whichever is greater
1MRK 505 379-BEN R
r
r
r
r
r
r
Hitachi Energy