ABB Relion 650 Series Technical Manual page 207

1MRK 506 326-UUS B
6.9.8 Technical data
Table 111: LPTTR (26) technical data
Function
Reference current
Reference temperature
Operate time:
t
= ×
t ln
EQUATION1356 V1 EN-US
I = actual measured current
I = load current before
p
overload occurs
I = base current, IBase
b
Alarm temperature
Trip temperature
Reset level temperature
6.10 Breaker failure protection CCRBRF (50BF)
6.10.1 Identification
Function description
Breaker failure protection
6.10.2 Functionality
Breaker failure protection (CCRBRF, 50BF) ensures fast back-up tripping of surrounding breakers
in case the protected breaker fails to open. CCRBRF (50BF) 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 unnecessary operation.
Contact check criteria can be used where the fault current through the breaker is small.
Line distance protection REL650
Technical manual
Range or value
(0-400)% of
(0-600)°C
Time constant t = (0–1000)
minutes
æ ö
2 2
-
I I
p
ç ÷
ç ÷
2 2
-
I I
è ø
b
(Equation 39)
(0-200)°C
(0-600)°C
(0-600)°C
© Copyright 2011 ABB Power Grids. All rights reserved
Accuracy
IBase
± 1.0% of I
± 1.0°C
IEC 60255-8, class 5 + 200 ms
± 2.0% of heat content trip
± 2.0% of heat content trip
± 2.0% of heat content trip
IEC 61850 IEC 60617
identification identification
CCRBRF
3I>BF
SYMBOL-U V1 EN-US
Current protection
n
ANSI/IEEE C37.2
device number
50BF
Section 6
M12352-1 v6
IP14514-1 v3
M14878-1 v3
M11550-6 v9
201