GE G60

2-18 G60 Generator Protection System GE Multilin
2.2 SPECIFICATIONS 2 PRODUCT DESCRIPTION
2
SUB-HARMONIC STATOR GROUND
Stator ground resistance pickup accuracy: ±5% of reading from 1
to 10 kΩ, ±10% of reading from 10 to 20
kΩ
Total stator capacitance to ground: 200 nF to 2 μF
Sub-harmonic voltage metering accuracy: ±2% of reading or 0.2 V
from 0.5 to 25 V AC
Sub-harmonic current metering accuracy: ±2% of reading or 5 mA
from 5 to 200 mA
Sub-harmonic element operating time: 0.6 to 1.2 s
Sub-harmonic element dropout level accuracy: 102 to 103% of
pickup
Time delay accuracy: ±3% of time delay setting or ± 4 ms,
whichever is greater
FIELD GROUND
Measured field ground resistance: 1 kΩ to 20 MΩ
Ground resistance accuracy:±5% of reading ±250 Ω from 1 to 500
kΩ
Field winding capacitance: 1 to 10 μF
Maximum field voltage: 600 V DC rated field voltage / 1000 V
ripple peak for single box option; 800
V DC rated field voltage / 2000 V ripple
peak for external resistor box option
Field voltage measurement range: 15 to 800 V
Field voltage measurement accuracy: ±1 V or ±3% of reading (for
GPM-F-L); ±1 V or ±5% of reading (for
GPM-F-H)
Field ground RMS current accuracy: ±5% of reading
Fault location accuracy: ±5% of reading
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: ±3% of time delay setting or ±4ms,
whichever is greater
FIELD CURRENT
Field current measurement (dcmA) accuracy: ±0.2% of full scale
Field overcurrent and undercurrent operating time: 1 power sys-
tem 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: ±3% of time delay setting or ±4 ms which-
ever is greater
UNDERFREQUENCY
Minimum signal: 0.10 to 1.25 pu in steps of 0.01
Pickup level: 20.00 to 65.00 Hz in steps of 0.01
Dropout level: pickup + 0.03 Hz
Level accuracy: ±0.001 Hz
Time delay: 0 to 65.535 s in steps of 0.001
Timer accuracy: ±3% of operate time or ±1/4 cycle
(whichever is greater)
Operate time: 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
Typical times are average operate times including variables such
as frequency change instance, test method, etc., and may vary by
±0.5 cycles.
OVERFREQUENCY
Pickup level: 20.00 to 65.00 Hz in steps of 0.01
Dropout level: pickup – 0.03 Hz
Level accuracy: ±0.001 Hz
Time delay: 0 to 65.535 s in steps of 0.001
Timer accuracy: ±3% of operate time or ±1/4 cycle
(whichever is greater)
Operate time: 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
Typical times are average operate times including variables such
as frequency change instance, test method, etc., and may vary by
±0.5 cycles.
RATE OF CHANGE OF FREQUENCY
df/dt trend: increasing, decreasing, bi-directional
df/dt pickup level: 0.10 to 15.00 Hz/s in steps of 0.01
df/dt dropout level: 96% of pickup
df/dt level accuracy: 80 mHz/s or 3.5%, whichever is greater
Overvoltage supv.: 0.100 to 3.000 pu in steps of 0.001
Overcurrent supv.: 0.000 to 30.000 pu in steps of 0.001
Pickup delay: 0 to 65.535 s in steps of 0.001
Reset delay: 0 to 65.535 s in steps of 0.001
Timer accuracy: ±3% of operate time or ±1/4 cycle
(whichever is greater)
95% settling time for df/dt: <24 cycles
Operate time: typically 9.5 cycles at 2 × pickup
typically 8.5 cycles at 3 × pickup
typically 6.5 cycles at 5 × pickup
Typical times are average operate times including variables such
as frequency change instance, test method, etc., and may vary by
±0.5 cycles.
TURBINE FREQUENCY OUT-OF-BAND (OOB)
ACCUMULATED OPERATING TIME
Frequency OOB accumulation: 7 sets; 20 to 70 Hz in steps of 0.01
Frequency OOB accumulation pickup: 1 to 65536 s in steps of 1
Frequency OOB accumulator preset: 1 to 65536 s in steps of 1
Level accuracy: ±0.01 Hz
Minimum volt/amp supervision: 0.1 to 1.25 pu of V_1 or I_1
Timer accuracy of accumulation: ±1% or 1 second, whichever is
greater