Inputs - GE Multilin 850 Instruction Manual

SPECIFICATIONS
NOTE:

Inputs

1–28
CURRENT AND VOLTAGE HARMONICS
Parameters:........................................................... Magnitude of each harmonic and THD
Range:...................................................................... 2
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
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: ........................... 50 Hz, 60 Hz
Sampling frequency:......................................... 64 samples per power cycle
Tracking frequency range:............................. 3 to 72 Hz
nd th
to 25 harmonic: per-phase displayed as % of f
fundamental frequency
THD: per-phase displayed as % of f
10, 15, 20, 30 minutes
Block Interval / Rolling Demand, time interval (programmed):
5, 10, 15, 20, 30 minutes
Sensitive Ground CT (5A/1A): 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
(configurable)
128 samples per power cycle (available for transient
recorder
850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 1: INTRODUCTION
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