ABB REG670 - Technical Data

8.7.8 Technical data
Table 199: 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 77)
I = actual measured current
Ip = load current before overload
occurs
Iref = reference load current
I
p
= load current before overload
occurs
Time constant τ = (0.10–500.00)
minutes
±5.0% or ±200 ms whichever
is greater
Alarm level 1 and 2 (50–99)% of heat content operate
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
8.8 Breaker failure protection 3-phase activation and
output CCRBRF
8.8.1 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
8.8.2 Functionality
Breaker failure protection (CCRBRF) ensures a fast backup 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.
Contact check criteria can be used where the fault current through the breaker is small.
1MRK502052-UEN B Section 8
Current protection
407
Technical manual