1–24 845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
SPECIFICATIONS CHAPTER 1: INTRODUCTION
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
Universal Time)
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 k
Isolation: .................................................................2 kV
RTD INPUTS
Types (3-wire):......................................................100 Platinum, 120 Nickel, 100 Nickel, 10 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
max. per lead for copper RTDs
OHMS INPUT
Type:.........................................................................Resistance (ohms)
Range:...................................................................... 0 to 500 or 0.5 to 5.1 k
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
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