GE 850 User Manual

CHAPTER 1: INTRODUCTION SPECIFICATIONS
850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL 1–33
DEMAND
Measured Values:................................................Phase A/B/C present and maximum current
Measurement Type:...........................................Thermal Exponential, 90% response time (programmed): 5,
10, 15, 20, 30 minutes
Block Interval / Rolling Demand, time interval (programmed):
5, 10, 15, 20, 30 minutes
Current Pickup Level:.........................................10 to 10000 in steps of 1 A
Dropout Level: ......................................................96-98% of Pickup level
Level Accuracy:....................................................± 2%
NOTE
NOTE:
Factory tested at 25°C
Inputs
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
Sensitive Ground CT (5A/1A): 0.002 to 4.6 x CT rating RMS
symmetrical
Short Term CT Withstand:...............................1 second at 100 x rated current
2 seconds at 40 x rated current
continuous at 3 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
1 min/hr at 420 V to neutral
LEA VOLTAGE INPUTS
Number of LEA Sensors:..................................6 LEA inputs, 2 3-phase voltage banks
Max. Input Range:...............................................+18 Vpeak (12*1.4142 =16.97peak < 18 Vpeak)
LEA Phase-Neutral Range: .............................1.0 Vrms to 12.0 Vrms (50Hz or 60Hz sinusoidal)
Nominal Phase-Neutral Range: ...................1.0 Vrms to 10.0 Vrms
Burden: ....................................................................< 0.1 VA
Accuracy:................................................................± 0.5% (1 V-12 Vrms) and ±0.5º (1 V-12 Vrms)
Voltage withstand for 10 seconds
(thermal):............................................................300 VAC
Input Impedance:................................................2 MΩ (phase-to-neutral)
ANALOG INPUTS
Current Input (mA DC):......................................0 to 1mA, 0 to 5mA, 0 to 10mA, 0 to 20mA, 4 to 20mA
(configurable)
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

GE 850 Specifications

General

Brand	GE
Model	850
Category	Protection Device
Language	English