Operating curve type
51LT
(4) Long Time Moderately Inverse
x
(5) Long Definite Time
x
(6) Very Long Time Extremely Inverse
x
(7) Very Long Time Very Inverse
x
(8) Very Long Time Inverse
x
(9) Long Time Normal Inverse
x
(14) IEC Long Time Inverse
x
(17) Programmable
x
For a detailed description of timers, refer to section
Table 88:
Reset time characteristics supported by different stages
Reset curve type
51LT
(1) Immediate
x
(2) Def time reset
x
(3) Inverse reset
x
4.1.2.6
Application
The long time overcurrent protection is used in special feeder protection application
where operating time provided by 51P is not good enough for coordination purpose.
4.1.2.7
Signals
Table 89:
51LT Input signals
Name
Type
Default
Description
I_A
SIGNAL
0
Phase A current
I_B
SIGNAL
0
Phase B current
I_C
SIGNAL
0
Phase C current
BLOCK
BOOLEAN
0=False
Block signal for activating the blocking mode
ENA_MULT
BOOLEAN
0=False
Enable signal for current multiplier
Section 4
1MRS240050-IB C
Protection functions
134
REF615R
Technical Manual
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