Metering - GE 845 Instruction Manual

SPECIFICATIONS

Metering

1–20
FLEXELEMENTS
Number of elements: ........................................ 8
Operating signal: ................................................ Any analog actual value, or two values in a differential mode
Operating signal mode: ................................... Signed, or Absolute value
Operating mode:................................................. Level, Delta
Comparison direction:...................................... Over, Under
Pickup Level: ......................................................... -30.000 to 30.000 pu in steps of 0.001 pu
Hysteresis:.............................................................. 0.1 to 50.0% in steps of 0.1%
Delta dt:................................................................... 40 msec to 45 days
Pickup and dropout delays: ........................... 0.000 to 6000.000 s in steps of 0.001 s
FLEXSTATES
Number of States: .............................................. 256 logical variables grouped under 16 Modbus addresses
Programmability: ................................................ Any FlexLogic operand, any digital input, any virtual input,
NON-VOLATILE LATCHES
Type: ......................................................................... Set-dominant or Reset-dominant
Number: .................................................................. 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 100000 ms in steps of 1 ms
Saturation level: .................................................. 20 times the pickup level
USER-PROGRAMMABLE LEDS
Number: .................................................................. 12
Programmability: ................................................ any logic variable, contact, or virtual input
Reset mode: .......................................................... self-reset or latched
USER-PROGRAMMABLE PUSHBUTTONS
Number of pushbuttons:................................. 3
Mode:........................................................................ Self-reset, latched
Display message:................................................ 1 line of 25 characters maximum
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
Timer accuracy: .................................................. ±3% of delay setting or ±¼ cycle (whichever is greater) from
RMS PARAMETERS
Currents
Parameters:........................................................... Phase A, B, C, Neutral, Ground
Accuracy:................................................................ ± 0.25% of reading or ± 0.2% of rated (whichever is greater)
Voltages
Parameters:........................................................... Wye VTs: A-n, B-n, C-n, A-B, B-C, C-A, Average Phase, Neutral
Accuracy:................................................................ ± 0.5% of reading from 15 to 208 V
any remote input
pickup to operate
from 0.1 to 2.0 x CT
± 1% of reading > 2.0 x CT
and Residual
Delta VTs: A-B, B-C, C-A, Neutral and Residual
± 1% for open Delta connections
845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 1: INTRODUCTION