GE 889 Instruction Manual page 38

SPECIFICATIONS
1–28
AC VOLTAGE
VT Range: ............................................................... 10 to 260 V
Nominal Frequency:.......................................... 20 to 65 Hz
Burden: .................................................................... <0.25 VA at 120 V
Conversion Range:............................................. 1 to 275 V
Voltage Withstand:............................................. continuous at 260 V to neutral
ANALOG INPUTS
Current Input (mA DC):...................................... 0 to 1mA, 0 to 5mA, 0 to 10mA, 0 to 20mA, 4 to 20mA
Input Impedance: ............................................... 375 Ω ± 10%
Conversion range: .............................................. 0 to +21 mA DC
Accuracy: ............................................................... ± 1% of full scale,
Type: ......................................................................... Passive
Analog Input Supply:......................................... +24 V DC at 100 mA max.
Sampling Interval: .............................................. Typically 500 ms
FREQUENCY
Nominal frequency setting: ........................... 25 Hz, 50 Hz, 60 Hz
Sampling frequency:......................................... 64 samples per power cycle
Tracking frequency range:............................. 2 to 72 Hz
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
CONTACT INPUTS
Number of Inputs: .............................................. Based on relay ordering
Type: ......................................................................... Wet or Dry
Wet Contacts:....................................................... 300 V DC maximum
Selectable thresholds: ...................................... 17, 33, 84, 166 VDC
Tolerance:............................................................... ±20%
Recognition time:................................................ 1 ms (typical)
Debounce time: ................................................... 0.0 to 16.0 ms in steps of 0.5 ms
Continuous current draw (burden): ............ 2 mA
CLOCK
Setup: ....................................................................... Date and Time, Daylight Saving Time, UTC (Coordinated
Backup Retention: .............................................. 1 hour
IRIG-B INPUT
Auto-detect: .......................................................... DC and AM
Amplitude Modulation:..................................... 1 V to 10 V pk-to-pk
DC Shift:................................................................... TTL
Input Impedance: ............................................... 40 kΩ
Isolation: ................................................................. 2 kV
1 min/hr at 420 V to neutral
(configurable)
128 samples per power cycle (available for transient
recorder
Universal Time)
889 GENERATOR PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 1: INTRODUCTION