ABB Relion 650 Series Technical Manual page 206

Section 6
Current protection
IA, IB, IC
ANSI09000637 V2 EN-US
Figure 104: Functional overview of LPTTR (26)
200
Calculation
of final
temperature
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Final Temp
> TripTemp
actual temperature
Calculation
of actual
temperature
Actual Temp >
AlarmTemp
Actual Temp
> TripTemp
Lock-
Actual Temp
< Recl Temp
Calculation
of time to
trip
Calculation
of time to
reset of
lockout
ANSI09000637-2-en.vsd
1MRK 506 326-UUS B
PICKUP
ALARM
TRIP
LOCKOUT
out
logic
TTRIP
TENRECL
Line distance protection REL650
Technical manual