APPENDIX
193
8.2 APPENDIX A2 - PROTECTION FUNCTIONS
Note *: 59N alternative to 24,27,59,81O and 81U
Note **: 50N.2/51N.2 alternative to 87NHIZ.2
Note ***: 50N.1/51N.1 alternative to 87NHIZ.1
I
L1-H
, I
L2-H
,
I
L3-H
87T
74TCS
I
E-1
I
E-2
26
Note *
Note **
Note ***
50N/51N
59N
I2/I146
37
49
50/51 BF 74CT
74CT
24 27 59
81O/81U
SIDE H or SIDE L
SIDE H or SIDE L
SIDE H
87NHIZ.1
50N.1/51N.1
64REF.1
SIDE H or SIDE L
I
L1-L
, I
L2-L
, I
L3-L
50N/51N
SIDE L
I2/I146
37
49
50/51
BF
XMR - T
87NHIZ.2
50N.1/51N.2
64REF.2
Standard Protective & control elements
SW Pack optional configuration
Protec ti on functi on Work i n Pr ogr ess
24 (L or H) Overflux (Side L or Side H)
26 Pt100 thermal probes
27 (L or H) Undervoltage (Side L or Side H)
37 (L, H, T) Undercurrent (Side L, Side H, Side T)
46 (L, H, T) Negative sequence overcurrent (Side L,
Side H, Side T)
I2/I1 (L, H, T) Negative/positive sequence current
ratio (Side L, Side H, Side T)
49 (L, H, T) Thermal image (Side L, Side H, Side T)
50/51 (L, H, T) Phase overcurrent (Side L, Side H, Side T)
50N/51N/87NHIZ1[2]-21[3] Residual overcurrent/
High impedance restricted earth fault
59 (L or H) Phase overvoltage (Side L or Side H)
59N (L or H) Residual overvoltage (Side L or Side H)
64REF.1 (L or H) Biased restricted differential
ground fault (Side L or Side H)
64REF.2 (L or H) Biased restricted differential
ground fault (Side L or Side H)
67N Directional earth fault overcurrent
81O/81U (L or H) Over-Underfrequency (Side L or Side H)
86 Lock-out
87T (L or H) Double slope biased differential for
transformers (Side L or Side H)
BF Side (L, H, T) Circuit breaker failure (Side L, Side H, Side T)
74CT CT supervision
74TCS (L, H, T) Trip circuit supervision (Side L, Side H, Side T)
86
XMR-T EQUIPMENT MANUAL
Ed. 2.9 - 02/2021
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