GE T35 Instruction Manual page 33

CHAPTER 2: PRODUCT DESCRIPTION
Pickup level:
Dropout level:
Level accuracy:
0.1 to 2.0 × CT:
> 2.0 × CT:
Curve shapes:
Curve multiplier:
Reset type:
Curve timing accuracy at 1.03 to 20 x pickup:
Voltage restraint:
PHASE/GROUND IOC
Current:
Pickup level:
Dropout level:
Level accuracy:
0.1 to 2.0 × CT rating:
> 2.0 × CT rating:
Overreach:
Pickup delay:
Reset delay:
Operate time:
Timer accuracy:
TRANSFORMER HOTTEST-SPOT TEMPERATURE
Operating quantity:
Pickup level:
Dropout level:
Pickup delay:
TRANSFORMER AGING FACTOR
Operating quantity:
Pickup level:
Pickup delay:
TRANSFORMER LOSS OF LIFE
Operating quantity:
Pickup level:
UNDERFREQUENCY
Minimum signal:
Pickup level:
Dropout level:
Level accuracy:
Time delay:
Timer accuracy:
Operate time:
Typical times are average operate times including variables such as frequency change instance, test method, and so on, and can vary by
±0.5 cycles.
T35 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
0.020 to 30.000 pu in steps of 0.001
97% to 98% of pickup
±0.5% of reading or ±0.4% of rated (whichever is greater)
±1.5% of reading > 2.0 × CT rating
IEEE Moderately/Very/Extremely Inverse; IEC (and BS) A/B/C and Short Inverse; GE IAC Inverse,
2
Short/Very/ Extremely Inverse; I t; FlexCurves™ (programmable); Definite Time (0.01 s base
curve)
Time Dial = 0.00 to 600.00 in steps of 0.01
Instantaneous/Timed (per IEEE)
±3.5% of operate time or ±½ cycle (whichever is greater) from pickup to operate
Modifies pickup current for voltage in the range of 0.1 < V < 0.9 VT Nominal in a fixed linear rela-
tionship
Phasor only
0.020 to 30.000 pu in steps of 0.001
97 to 98% of pickup
±0.5% of reading or ±0.4% of rated (whichever is greater)
±1.5% of reading
<2%
0.00 to 600.00 s in steps of 0.01
0.00 to 600.00 s in steps of 0.01
<16 ms at 3 × pickup at 60 Hz (Phase/Ground IOC)
<20 ms at 3 × pickup at 60 Hz (Neutral IOC)
±3% of operate time or ±1/4 cycle (whichever is greater)
computed temperature in °C
50 to 300°C in steps of 1
1°C below pickup
0 to 30000 min. in steps of 1
computed aging acceleration factor (pu)
1 to 10 pu in steps of 0.1
0 to 30000 min. in steps of 1
computed accumulated transformer loss of life, in hours
0 to 500000 hours in steps of 1
0.10 to 1.25 pu in steps of 0.01
20.00 to 65.00 Hz in steps of 0.01
pickup + 0.03 Hz
±0.001 Hz
0 to 65.535 s in steps of 0.001
±3% of operate time or ±1/4 cycle (whichever is greater)
typically 4 cycles at 0.1 Hz/s change
typically 3.5 cycles at 0.3 Hz/s change
typically 3 cycles at 0.5 Hz/s change
SPECIFICATIONS
2
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