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6.6.8
Technical data
Table 65:
LFPTTR/LCPTTR (26)technical data
Function
Range or value
Accuracy
Reference current
(0-400)% of
IBase
±
1.0% of I
n
Reference temperature
(0-600) °F, (0 - 300)°C
±
2.0°F, ±2.0°C
Operate time:
2
2
2
2
p
ref
I
I
t
ln
I
I
t
æ
ö
-
ç
÷
= ×
ç
÷
-
è
ø
EQUATION1356 V2 EN
(Equation 20)
I = actual measured current
I
p
= load current before overload
occurs
I
ref
= reference load current
Time constant
t
= (0–1000) minutes IEC 60255-8, ±5% + 200 ms
Alarm temperature
(0-400)°F, (0-200)°C
±
2.0°C
±
2.0°F
Trip temperature
(0--600)°F, (0-300)°C
±
2.0°C
±
2.0°F
Reset level temperature
(0-600)°F, (0-300)°C
±
2.0°C
±
2.0°F
6.7
Breaker failure protection 3-phase activation and output
CCRBRF (50BF)
6.7.1
Identification
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Breaker failure protection, 3-phase
activation and output
CCRBRF
3I>BF
SYMBOL-U V1 EN
50BF
6.7.2
Functionality
CCRBRF (50BF) can be current based, contact based, or an adaptive combination of these
two conditions.
Section 6
1MRK 511 287-UUS A
Current protection
136
Technical manual
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