Function Block; Signals - ABB RED650 Technical Manual

1MRK 505 394-UEN A
8.5.3
8.5.4
Line differential protection RED650 2.2 IEC
Technical manual
A thermal overload will often not be detected by other protection functions and the
introduction of the thermal overload protection can allow the protected circuit to
operate closer to the thermal limits.
The three-phase current measuring protection has an I
time constant and a thermal memory. The temperature is displayed in either Celsius
or Fahrenheit, depending on whether the function used is Thermal overload
protection (LCPTTR) (Celsius) or (LFPTTR) (Fahrenheit).
An alarm level gives early warning to allow operators to take action well before the
line is tripped.
Estimated time to trip before operation, and estimated time to reclose after
operation are presented.

Function block

LCPTTR
I3P* TRIP
BLOCK START
BLKTR ALARM
ENMULT LOCKOUT
AMBTEMP
SENSFLT
RESET
IEC13000199-1-en.vsd
IEC13000199 V1 EN-US
LFPTTR
I3P* TRIP
BLOCK START
BLKTR ALARM
ENMULT LOCKOUT
AMBTEMP
SENSFLT
RESET
IEC13000301-1-en.vsd
IEC13000301 V1 EN-US
Figure 91: LCPTTR/LFPTTR function bloc

Signals

Table 90: LCPTTR Input signals
Name Type
I3P GROUP
SIGNAL
BLOCK BOOLEAN
BLKTR BOOLEAN
ENMULT BOOLEAN
AMBTEMP REAL
SENSFLT BOOLEAN
RESET BOOLEAN
2
t characteristic with settable
Default Description
- Group signal for current input
0 Block of function
0 Block of trip
0 Current multiplyer used when THOL is for two or
more lines
0 Ambient temperature from external temperature
sensor
0 Validity status of ambient temperature sensor
0 Reset of internal thermal load counter
Section 8
Current protection
M12627-3 v8
PID-3908-INPUTSIGNALS v7
205