8.4.8 Technical data
Table 107: TRPTTR technical data
Function
Range or value Accuracy
Base current 1 and 2 (30–250)% of
IBase
± 1.0% of I
r
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 level 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
r
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
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
SYMBOL-U V1 EN
50BF
8.5.2 Functionality
CCRBRF can be current based, contact based, or an adaptive combination of these two
conditions.
Breaker failure protection, 3-phase activation and output (CCRBRF) ensures fast
back-up tripping of surrounding breakers in case the own breaker fails to open.
CCRBRF can be current based, contact based, or an adaptive combination of these two
conditions.
Current check with extremely short reset time is used as check criterion to achieve
high security against inadvertent operation.
1MRK 502 048-UEN A Section 8
Current protection
221
Technical manual
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