Toshiba GRZ100 B Series, Instruction Manual, Page: 394 / 447

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393
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6 F 2 S 0 8 4 6
Directional Earth Fault Protection
Characteristic angle
Polarising voltage (3V0)
Zero-sequence current (3I0)
Time multiplier for inverse time characteristic
Definite time delay for backup trip
Accuracy of pick-up value 0 to 90
°
in 1
°
steps (3I0 lags for
−
3V0)
1.7 to 21.0V in 0.1V steps
0.10 to 1.00A in 0.01A in 0.01A steps (1A relay)
0.5 to 5.0A in 0.1A steps (5A relay)
0.05 to 1.00 in 0.01 steps
0.00 to 10.00s in 0.01s steps
±
5%
Directional Earth Fault Command Protection
Time for delayed trip
Coordination time 0.00 to 0.30s in 0.01s steps
0 to 50ms in 1ms steps
Inverse Time Earth Fault Protection
Earth fault
Time multiplier
Characteristic
Accuracy of inverse time characteristics
Reset definite time 0.10 to 1.00A in 0.01A steps (1A relay)
0.5 to 5.0A in 0.1A steps (5A relay)
0.05 to 1.00 in 0.01 steps
Refer to Figure 8.
Standard, Very and Long-time: IEC60255-3 class 5
Extremely inverse: IEC60255-3 class 7.5
0.0 to 10.0s in 0.1s steps
Definite Time Earth Fault Protection
Earth fault
Time for delayed trip
Accuracy of pick-up value 0.10 to 1.00A in 0.01A steps (1A relay)
0.5 to 5.0A in 0.1A steps (5A relay)
0.00 to 10.00s in 0.01s steps
±
5%
Weak Infeed and Echo Protection
Phase-to-phase undervoltage element
Phase-to-earth undervoltage element 50 to 100V in 1V steps
10 to 60V in 1V steps
Thermal overload Protection
Thermal setting (THM = k.I
FLC
)
Time constant (
τ
)
Thermal alarm
Pre-load current setting
OFF, 0.40 – 2.00A in 0.01A steps (1A rating)
OFF, 2.0 – 10.0A in 0.1A steps (5A rating)
0.5 – 300.0mins in 0.1min steps
OFF, 50% to 99% in 1% steps
0.00 – 1.00A in 0.01A steps (1A rating)
0.0 – 5.0A in 0.1A steps (5A rating)
Overvoltage Protection
1
st
, 2
nd
Overvoltage thresholds:
Delay type:
IDMTL Time Multiplier Setting TMS:
DTL delay:
DO/PU ratio
Reset Delay (1
st
threshold only):
OFF, 5.0 – 150.0V in 0.1V steps (for both phase-to-phase and
phase-to-neutral voltage)
DTL, IDMTL(1
st
threshold only)
0.05 – 100.00 in 0.01 steps
0.00 – 300.00s in 0.01s steps
10 – 98% in 1% steps
0.0 – 300.0s in 0.1s steps
Undervoltage Protection
1
st
, 2
nd
Undervoltage thresholds:
Delay type:
IDMTL Time Multiplier Setting TMS:
DTL delay:
DO/PU ratio
Reset Delay (1
st
threshold only):
OFF, 5.0 – 150.0V in 0.1V steps (for both phase-to-phase and
phase-to-neutral voltage)
DTL, IDMTL(1
st
threshold only)
0.05 – 100.00 in 0.01 steps
0.00 – 300.00s in 0.01s steps
10 – 98% in 1% steps
0.0 – 300.0s in 0.1s steps