1MRS751802-MUM
REX 521
247
Protection Relay
Technical Reference Manual, Standard Configurations
12. Symbol notations
Symnotrex_a
48,14,66
I t, n<
s
2
46R
3I
3I
46
I >
2
37
3I<
60
F
49
3
SYNC 25
3I > 50/51
3I> 67
I
0
>
50N/51N
67NI
0
>
3U > 59
3U < 27
U
0
>
59N
3I
2f
>
68
DI>
46
3
49F
f </f>
81U/81O
790
I
CBFP * /62
86
LO
= multiple-stage three-phase overcurrent protection, low-set, high-set and instantaneous
stage available
= multiple-stage earth-fault protection, low-set, high-set and instantaneous stage
available
= multiple-stage directional earth-fault protection, low-set, high-set and instantaneous
stage available
= inrush detection based on the 2nd harmonic content of phase currents, applied for
preventing possible unnecessary operation of overcurrent or earth-fault protection
during transformer switching-in or to start cold load pick-up logic
= phase discontinuity protection
= thermal overload protection for feeders
= multiple-shot auto-recloser
= circuit-breaker failure protection
= lockout (Refer to chapter Lockout function in this manual)
= multiple-stage three-phase directional overcurrent protection, low-set, high-set and
instantaneous stage available
= under/overfrequency protection/load shedding scheme
= circuit breaker synchro-check/direction of energizing check function
= three-phase overvoltage protection, low-set and high-set stage available
= three-phase undervoltage protection, low-set and high-set stage available
= multiple-stage residual overvoltage protection, low-set, high-set and instantaneous
stage available
= start-up supervision for motors (MotStart)
= phase reversal protection (PREV3)
= negative phase-sequence protection, low-set and high-set
stages available (NPS3_)
= three-phase non-directional undercurrent protection, stages 1 and 2
available (NUC3St2)
= fuse failure supervision (FuseFail)
= three-phase thermal overload protection for motors, generators
and transformers (TOL3Dev)
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