GE 845 Instruction Manual page 34

SPECIFICATIONS
1–24
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
RTD INPUTS
Types (3-wire): ...................................................... 100 Ω Platinum, 120 Ω Nickel, 100 Ω Nickel, 10 Ω Copper
Sensing current: .................................................. 5 mA
Range:...................................................................... –40 to +250°C (-40 to +482°F)
Accuracy: ............................................................... ±2°C (±4°F)
Isolation: ................................................................. 36 V pk-pk (a group of RTDs to ground)
Lead Resistance: ................................................. 25 Ohms max. per lead for platinum or nickel and 3 Ohms
OHMS INPUT
Type: ......................................................................... Resistance (ohms)
Range:...................................................................... 0 to 500 Ω or 0.5 to 5.1 kΩ
Bias current: .......................................................... 1.9 mA through the full range
Accuracy: ............................................................... ± 1% (of full scale based on input range)
TAP CHANGER
Operating Parameter: ...................................... BCD, ohms In 1, Analog Ip 1
Tap Changer Range:.......................................... -19 to +39
Accuracy: ............................................................... Per Input accuracy
Universal Time)
max. per lead for copper RTDs
845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 1: INTRODUCTION