GE G60 Instruction Manual page 39

CHAPTER 2: PRODUCT DESCRIPTION
FIELD GROUND
Measured field ground resistance:
Ground resistance accuracy:
Field winding capacitance:
Maximum field voltage:
Field voltage measurement range:
Field voltage measurement accuracy:
Field ground RMS current accuracy:
Fault location accuracy:
Field ground resistance typical operating time:1.1 s + (1 / injection frequency)
Field ground element dropout level accuracy:102 to 103% of pickup
Time delay accuracy:
FIELD CURRENT
Field current measurement (dcmA) accuracy:±0.2% of full scale
Field overcurrent and undercurrent operating time:1 power system cycle
Field current element dropout level accuracy:102 to 103% of pickup for undercurrent and 97 to 98% of pickup for overcurrent
Time delay accuracy:
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.
OVERFREQUENCY
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.
RATE OF CHANGE OF FREQUENCY
df/dt trend:
df/dt pickup level:
df/dt dropout level:
df/dt level accuracy:
Overvoltage supv.:
Overcurrent supv.:
Pickup delay:
Reset delay:
Timer accuracy:
95% settling time for df/dt:
G60 GENERATOR PROTECTION SYSTEM – INSTRUCTION MANUAL
1 kΩ to 20 MΩ
±5% of reading ±250 Ω from 1 to 500 kΩ
1 to 10 μF
600 V DC rated field voltage / 1000 V ripple peak for single box option; 800 V DC rated field volt-
age / 2000 V ripple peak for external resistor box option
15 to 800 V
±1 V or ±3% of reading (for GPM-F-L); ±1 V or ±5% of reading (for GPM-F-H)
±5% of reading
±5% of reading
±3% of time delay setting or ±4ms, whichever is greater
±3% of time delay setting or ±4 ms whichever is greater
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
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
increasing, decreasing, bi-directional
0.10 to 15.00 Hz/s in steps of 0.01
96% of pickup
80 mHz/s or 3.5%, whichever is greater
0.100 to 3.000 pu in steps of 0.001
0.020 to 30.000 pu in steps of 0.001
0 to 65.535 s in steps of 0.001
0 to 65.535 s in steps of 0.001
±3% of operate time or ±1/4 cycle (whichever is greater)
<24 cycles
SPECIFICATIONS
2
2-25