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Section 7
Current protection
7.3.8
7.4
7.4.1
7.4.2
112
Technical data
Table 47:
TRPTTR technical data
Function
Base current 1 and 2
Operate time:
æ
2
2
ö
-
I
I
p
t
ç
÷
= ×
t
ln
ç
÷
2
2
-
I
I
è
ø
ref
(Equation 22)
EQUATION1356 V2 EN
I = actual measured current
Ip = load current before overload
occurs
Iref = reference load current
Alarm level 1 and 2
Operate current
Reset level temperature
Breaker failure protection 3-phase activation and
output CCRBRF
Identification
Function description
Breaker failure protection, 3-phase
activation and output
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.
Range or value
IBase
(30–250)% of
I
= load current before overload
p
occurs
Time constant τ = (1–500)
minutes
(50–99)% of heat content trip
value
(50–250)% of
IBase
(10–95)% of heat content trip
IEC 61850
IEC 60617
identification
identification
CCRBRF
SYMBOL-U V1 EN
1MRK 505 288-UEN A
Accuracy
± 1.0% of I
r
IEC 60255–8, ±5% + 200 ms
± 2.0% of heat content trip
± 1.0% of I
r
± 2.0% of heat content trip
ANSI/IEEE C37.2
device number
50BF
3I>BF
Technical manual
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