Technical Data - ABB Relion Technical Manual

1MRK 502 048-UUS A
8.4.8
8.5
8.5.1
8.5.2
Technical manual

Technical data

Table 107: TRPTTR (49) technical data
Function
Base current 1 and 2
Operate time:
æ 2 2 ö
-
I I
p
ç ÷
t
= ×
t ln
ç ÷
2 2
-
I I
è ø
ref
(Equation 63)
EQUATION1356 V2 EN
I = actual measured current
Ip = load current before overload
occurs
Iref = reference load current
Alarm pickup 1 and 2
Operate current
Reset level temperature
Breaker failure protection 3-phase activation and output
CCRBRF (50BF)
Identification
Function description
Breaker failure protection, 3-phase
activation and output
Functionality
CCRBRF (50BF) can be current based, contact based, or an adaptive combination of these
two conditions.
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
Section 8
Current protection
Accuracy
± 1.0% of I
n
IEC 60255–8, ±5% + 200 ms
± 2.0% of heat content trip
± 1.0% of I
n
± 2.0% of heat content trip
ANSI/IEEE C37.2
device number
50BF
3I>BF
241