7.7.6
Technical data
Table 218:
LFPTTR/LCPTTR (26) technical data
Function
Range or value
Accuracy
Reference current
(0-400)% of
IBase
±
1.0% of I
n
Reference temperature
(0-400)°C, (0 - 600)°F
±
2°F, ±2°F
Trip time:
2
2
2
2
2
ln
p
Trip
Amb
p
ref
ref
I
I
t
T
T
I
I
I
T
t
-
=
-
-
-
×
é
ù
ê
ú
ê
ú
ê
ú
ê
ú
ë
û
EQUATION13000039 V2 EN
(Equation 96)
T
Trip
= set trip temperature
T
Amb
= ambient temperature
T
ref
= temperature rise above ambient at I
ref
I
ref
= reference load current
I = actual measured current
I
p
= load current before overload occurs
Time constant
t
= (1–1000) minutes IEC 60255-8, ±5.0%
or ±200 ms
whichever is greater
Alarm temperature
(0-400)°F, (0-200)°C
±
2.0% of heat
content trip
Trip temperature
(0-400)°C, (0-600)°F
±
2.0% of heat
content trip
Reset level temperature
(0-400)°C, (0-600)°F
±
2.0% of heat
content trip
7.8
Breaker failure protection CCRBRF (50BF)
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Breaker failure protection
CCRBRF
3I>BF
SYMBOL-U V1 EN
50BF
Section 7
1MRK505222-UUS C
Current protection
456
Technical reference manual
Содержание Relion 670 series
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