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8.4.8
Technical data
Table 107:
TRPTTR (49) technical data
Function
Range or value
Accuracy
Base current 1 and 2
(30–250)% of
IBase
± 1.0% of I
n
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 63)
I = actual measured current
Ip = load current before overload
occurs
Iref = reference load current
I
p
= load current before overload
occurs
Time constant τ = (1–500)
minutes
IEC 60255–8, ±5% + 200 ms
Alarm pickup 1 and 2
(50–99)% of heat content trip
value
± 2.0% of heat content trip
Operate current
(50–250)% of
IBase
± 1.0% of I
n
Reset level temperature
(10–95)% of heat content trip
± 2.0% of heat content trip
8.5
Breaker failure protection 3-phase activation and output
CCRBRF (50BF)
8.5.1
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
8.5.2
Functionality
CCRBRF (50BF) can be current based, contact based, or an adaptive combination of these
two conditions.
1MRK 502 048-UUS A
Section 8
Current protection
241
Technical manual
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