GE T60 Instruction Manual page 52

2.3 SPECIFICATIONS
NEUTRAL DIRECTIONAL OVERCURRENT
Directionality:
Polarizing:
Polarizing voltage:
Polarizing current:
Operating current:
Level sensing:
2
Restraint, K:
Characteristic angle:
Limit angle:
Angle accuracy:
Offset impedance:
Pickup level:
Dropout level:
Operation time:
PHASE UNDERVOLTAGE
Pickup level:
Dropout level:
Level accuracy:
Curve shapes:
Curve multiplier:
Curve timing accuracy
at <0.90 x pickup:
AUXILIARY UNDERVOLTAGE
Pickup level:
Dropout level:
Level accuracy:
Curve shapes:
Curve multiplier:
Curve timing accuracy
at <0.90 x pickup:
PHASE OVERVOLTAGE
Voltage:
Pickup level:
Dropout level:
Level accuracy:
Pickup delay:
Operate time:
Timer accuracy:
2-22
Co-existing forward and reverse
Voltage, Current, Dual, Dual-V, Dual-I
V_0 or VX
IG
I_0
3  (|I_0| – K  |I_1|), IG
Independent for forward and reverse
0.000 to 0.500 in steps of 0.001
–90 to 90° in steps of 1
40 to 90° in steps of 1, independent for
forward and reverse
±2°
0.00 to 250.00  in steps of 0.01
0.002 to 30.000 pu in steps of 0.01
97 to 98%
<16 ms at 3  pickup at 60 Hz
0.000 to 3.000 pu in steps of 0.001
102 to 103% of pickup
±0.5% of reading from 10 to 208 V
GE IAV Inverse;
Definite Time (0.1s base curve)
Time dial = 0.00 to 600.00 in steps of
0.01
±3.5% of operate time or ±1/2 cycle
(whichever is greater) from pickup to
operate
0.000 to 3.000 pu in steps of 0.001
102 to 103% of pickup
±0.5% of reading from 10 to 208 V
GE IAV Inverse, Definite Time
Time Dial = 0 to 600.00 in steps of 0.01
±3.5% of operate time or ±1/2 cycle
(whichever is greater) from pickup to
operate
Phasor only
0.000 to 3.000 pu in steps of 0.001
97 to 98% of pickup
±0.5% of reading from 10 to 208 V
0.00 to 600.00 in steps of 0.01 s
30 ms at 1.10  pickup at 60 Hz
±3% of operate time or ±1/4 cycle
(whichever is greater)
T60 Transformer Protection System
2 PRODUCT DESCRIPTION
NEUTRAL OVERVOLTAGE
Pickup level: 0.000 to 3.000 pu in steps of 0.001
Dropout level: 97 to 98% of pickup
Level accuracy: ±0.5% of reading from 10 to 208 V
Pickup delay: 0.00 to 600.00 s in steps of 0.01 (definite
time) or user-defined curve
Reset delay: 0.00 to 600.00 s in steps of 0.01
Curve timing accuracy
at >1.1 x pickup: ±3.5% of operate time or ±1 cycle
(whichever is greater) from pickup to
operate
30 ms at 1.10  pickup at 60 Hz
Operate time:
AUXILIARY OVERVOLTAGE
Pickup level: 0.000 to 3.000 pu in steps of 0.001
Dropout level: 97 to 98% of pickup
Level accuracy: ±0.5% of reading from 10 to 208 V
Pickup delay: 0 to 600.00 s in steps of 0.01
Reset delay: 0 to 600.00 s in steps of 0.01
Timer accuracy: ±3% of operate time or ±1/4 cycle
(whichever is greater)
30 ms at 1.10  pickup at 60 Hz
Operate time:
VOLTS PER HERTZ
Voltage: Phasor only
Pickup level: 0.80 to 4.00 in steps of 0.01 pu V/Hz
Dropout level: 97 to 98% of pickup
Level accuracy: ±0.02 pu
Timing curves: Definite Time; Inverse A, B, and C,
FlexCurves™ A, B, C, and D
TD Multiplier: 0.05 to 600.00 s in steps of 0.01
Reset delay: 0.0 to 1000.0 s in steps of 0.1
Timer accuracy: ±3% of operate time or ±15 cycles
(whichever is greater) for values greater
than 1.1 × pickup
TRANSFORMER HOTTEST-SPOT TEMPERATURE
Operating quantity: computed temperature in °C
Pickup level: 50 to 300°C in steps of 1
Dropout level: 1°C below pickup
Pickup delay: 0 to 30000 min. in steps of 1
TRANSFORMER AGING FACTOR
Operating quantity: computed aging acceleration factor (pu)
Pickup level: 1 to 10 pu in steps of 0.1
Pickup delay: 0 to 30000 min. in steps of 1
TRANSFORMER LOSS OF LIFE
Operating quantity: computed accumulated transformer loss
of life, in hours
Pickup level: 0 to 500000 hours in steps of 1
GE Multilin