GE 845 User Manual

CHAPTER 1: INTRODUCTION SPECIFICATIONS
845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL 1–21
NON-VOLATILE LATCHES
Type: .........................................................................Set-dominant or Reset-dominant
Range: ......................................................................16 individually programmed
Output:.....................................................................Stored in non-volatile memory
Execution sequence: .........................................As input prior to protection, control and FlexLogic
FLEXCURVES
Number: ..................................................................4 (A through D)
Reset points:..........................................................40 (0.00 to 0.98 x pickup)
Operate points: ....................................................80 (1.03 to 20.0 x pickup)
Time delay: ............................................................0 to 200,000,000 ms in steps of 1 ms
Saturation level:...................................................20 times the pickup level
TAB PUSHBUTTONS
Number of elements: ........................................1 (20 Tab Pushbuttons)
Data Storage:........................................................Non-volatile memory
Mode:........................................................................Self-reset, latched
Display Message:................................................2 lines; 15 characters per line
Dropout Timer:.....................................................0.000 to 60.000 s in steps of 0.005
Auto-reset Timer:................................................0.2 to 600.0 s in steps of 0.1
Hold Timer: ............................................................0.1 to 10.0 s in steps of 0.1
Timer Accuracy: ..................................................±3% of delay setting or ±¼ cycle (whichever is greater) from
pickup to operate
USER-PROGRAMMABLE LEDS
Number: ..................................................................17 (14 + 3 PB LEDS) for Membrane and Rugged Front Panels
Programmability:................................................any logic variable, contact, or virtual input
Reset mode:........................................................... self-reset or latched
USER-PROGRAMMABLE PUSHBUTTONS
Number of pushbuttons:.................................3 (Membrane and Rugged Front Panels)
Mode:........................................................................Self-reset, latched
Display message:................................................2 lines of 13 characters on each line
Dropout timer:......................................................0.000 to 60.000 s in steps of 0.005
Auto-reset timer:.................................................0.2 to 600.0 s in steps of 0.1
Hold timer:..............................................................0.0 to 10.0 s in steps of 0.1
Metering
RMS PARAMETERS
Currents
Parameters:...........................................................Phase A, B, C, Neutral, Ground
Accuracy:................................................................± 0.25% of reading or ± 0.2% of rated (whichever is greater)
from 0.1 to 2.0 x CT
± 1% of reading > 2.0 x CT
Voltages
Parameters:...........................................................Wye VTs: A-n, B-n, C-n, A-B, B-C, C-A, Average Phase, Neutral
and Residual
Delta VTs: A-B, B-C, C-A, Neutral and Residual
Accuracy:................................................................± 0.5% of reading from 15 to 208 V
± 1% for open Delta connections
Real Power (Watts)
Range: ......................................................................-214748364.8 kW to 214748364.7 kW
Parameters:...........................................................3-phase; per phase if VT is Wye
Accuracy:................................................................± 1.0% of reading or 0.2 kW (whichever is greater) at -0.8 <
PF  -1.0 and 0.8 < PF < 1.0

GE 845 Specifications

General

Brand	GE
Model	845
Category	Protection Device
Language	English