Inputs - GE 845 Instruction Manual

SPECIFICATIONS
NOTE:
NOTE

Inputs

1–22
DEMAND
Measured Values: ............................................... Phase A/B/C present and maximum current
Measurement Type:........................................... Thermal Exponential, 90% response time (programmed): 5,
Current Pickup Level: ........................................ 10 to 10000 in steps of 1 A
Dropout Level:...................................................... 96-98% of Pickup level
Level Accuracy:.................................................... ± 2%
Factory tested at 25°C
AC CURRENTS
CT Rated Primary:............................................... 1 to 12000 A
CT Rated Secondary:......................................... 1 A or 5 A based on relay ordering
Burden: .................................................................... < 0.2 VA at rated secondary
Conversion Range:............................................. Standard CT: 0.02 to 46 x CT rating RMS symmetrical
Short Term CT Withstand: .............................. 1 second at 100 x rated current
AC VOLTAGE
VT Range: ............................................................... 10 to 260 V
Burden: .................................................................... <0.25 VA at 120 V
Conversion Range:............................................. 1 to 275 V
Voltage Withstand: ............................................ continuous at 260 V to neutral
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:............................................................... ±10%
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
Clock Setup:........................................................... Date and Time, Daylight Savings Time, UTC (Coordinated
Backup Retention: .............................................. 1hour
10, 15, 20, 30 minutes
Block Interval / Rolling Demand, time interval (programmed):
5, 10, 15, 20, 30 minutes
Sensitive Ground CT module: 0.002 to 4.6 x CT rating RMS
symmetrical
2 seconds at 40 x rated current
continuous at 3 x rated current
1 min/hr at 420 V to neutral
Universal Time)
Universal Time)
845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 1: INTRODUCTION