GE 889 - Control

1–20 889 GENERATOR PROTECTION SYSTEM – INSTRUCTION MANUAL
SPECIFICATIONS CHAPTER 1: INTRODUCTION
OVERFREQUENCY (81O)
Pickup Level: .........................................................20.00 to 65.00 Hz in steps of 0.01
Dropout Level:......................................................Pickup - 0.03 Hz
Pickup Time Delay: ............................................0.000 to 6000.000 s in steps of 0.001 s
Dropout Time Delay:.........................................0.000 to 6000.000 s in steps of 0.001 s
Minimum Operating Voltage:........................0.000 to 1.250 x VT in steps of 0.001 x VT
Level Accuracy: ...................................................± 0.001 Hz
Timer Accuracy:..................................................± 3% of delay setting or ± ¼ cycle (whichever is greater)
from pickup to operate
Operate Time: ......................................................typically 7.5 cycles at 0.1 Hz/s change
typically 7 cycles at 0.3 Hz/s change
typically 6.5 cycles at 0.5 Hz/s change
FAST PATH:
Typical times are average Operate Times including variables such as frequency change
instance, test method, etc., and may vary by ± 0.5 cycles.
FREQUENCY RATE OF CHANGE (81R)
df/dt Trend:............................................................Increasing, Decreasing, Bi-directional
df/dt Pickup Level:.............................................. 0.10 to 15.00 Hz/s in steps of 0.01 Hz/s
df/dt Dropout Level: .......................................... 96% of Pickup Level
df/dt Level Accuracy:........................................80 mHz/s or 3.5%, whichever is greater
Minimum Frequency:........................................ 20.00 to 80.00 Hz in steps of 0.01 Hz
Maximum Frequency: ...................................... 20.00 to 80.00 Hz in steps of 0.01 Hz
Minimum Voltage Threshold: ........................0.000 to 1.250 x VT in steps of 0.001 x VT
Minimum Current Threshold: ........................0.000 to 30.000 x CT in steps of 0.001 x CT
Pickup Time Delay: ............................................0.000 to 6000.000 s in steps of 0.001 s
Timer Accuracy:..................................................± 3% of delay setting or ± ¼ cycle (whichever is greater)
from pickup to operate
95% Settling Time for df/dt: ..........................< 24 cycles
Operate Time: ......................................................typically 10 cycles at 2 × Pickup
RTD PROTECTION
Pickup:......................................................................1°C to 250°C in steps of 1°C
Hysteresis: .............................................................2°C
Timer Accuracy:..................................................<2 s
Elements:................................................................Trip and Alarm
FLEXELEMENTS
Number of elements:........................................8
Operating signal: ................................................Any analog actual value, or two values in a differential mode
Operating signal mode:...................................Signed, or Absolute value
Operating mode:.................................................Level, Delta
Comparison direction:......................................Over, Under
Pickup Level: .........................................................-30.000 to 30.000 pu in steps of 0.001 pu
Hysteresis: .............................................................0.1 to 50.0% in steps of 0.1%
Delta dt:...................................................................40 msec to 45 days
Pickup and dropout delays:...........................0.000 to 6000.000 s in steps of 0.001 s
Control
ARC FLASH SENSOR/FIBER
Number of Point Sensors:...............................4
Detection Radius: ...............................................180 degree
Maximum Fiber Length (Point Sensor):.....18 ft
Fiber Size: ...............................................................1000 um
Mode:........................................................................ Multi-mode
Connector: .............................................................Small Media Interface (SMI)
Fiber Type: ............................................................. Plastic Optical Fiber
Bend Radius:.........................................................>25 mm