Table 1 - Typical Settings
IEEE No. Fig. Function Typical Settings and Remarks
24 21, Overexcitation PU: 1.1*V
NOM
/60; TD: 0.3; reset TD: 5
23 alarm P.U.: 1.18*V
NOM
/60
alarm delay: 2.5s
25 21, Synchronism Check Max Slip: 6RPM; Max phase angle error: 10°
28 Max V
MAG
error: 2.5% V
NOM
32 16, Reverse Power PU: turbine 1% of rated; 15 s
17 (one stage) PU: Reciprocating engine: 10% of rated; 5 s
32-1 17 Reverse Power PU: same as 32; 3 s
Nonelectrical Trip
Supervision
40 16, Loss-of-field (VAR Flow Level 1 PU: 60% VA rating; Delay: 0.2s;
18 Approach) Level 2 PU: 100% VA rating: 0.1s
46 26 Negative Sequence I
2
PU: 10% I
rated
; K=10
Overcurrent
49 20 Stator Temperature (RTD) Lower: 95°C; upper: 105°C
50/87 12 Differential via flux PU:10% I
NOM
or less if 1A relay may be used
summation CTs
50/27 IE 24 Inadvertent Energization 50: 0.5A (10% I
NOM
)
Overcurrent with 27, 81 27: 85% V
NOM
(81: Similar)
Supervision
51N 3 Stator Ground Over- PU: 10% I
NOM
; curve: EI; TD: 4. Inst: none. Higher PU
current (Low, Med Z Gnd, required to coordinate with load.
Phase CT Residual) No higher than 25% I
NOM
.
50/51N 2 Stator Ground Over- P.U.: 10% I
NOM
;
Curve EI, TD4; Inst 100% I
NOM
. Higher PU
current (Low, Med Z Gnd, if required to coordinate with load. No higher than
Neutral CT or Flux 25% I
NOM
.
Summation CT)
51GN, 4, Stator Ground Over- PU: 10% I
FAULT
at HV Term.; Curve: VI; TD:4.
51N 7 current (High Z Gnd)
51VC 11 Voltage Controlled PU: 50% I
NOM
; Curve: VI; TD: 4.
Overcurrent Control voltage: 80%V
NOM
.
23
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