GE Multilin 850

1–22 850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
SPECIFICATIONS CHAPTER 1: INTRODUCTION
BREAKER FAILURE
Mode:........................................................................3-pole
Current Supervision:..........................................phase and neutral current (fundamental phasor magnitude)
Current Supervision Pickup:...........................0.050 to 30.000 x CT in steps of 0.001 x CT
Current Supervision Dropout: .......................97 to 98% of pickup
Current Supervision Accuracy: ....................For 0.1 to 2.0 x CT: ± 0.5% of reading or ± 0.4% of rated
(whichever is greater),
For > 2.0 x CT: ± 1.5% of reading
Time Delay: ........................................................... 0.000 to 6000.000 s in steps of 0.001 s
Timer Accuracy:.................................................. ± 3% of delay setting or ± ¼ cycle (whichever is greater)
from pickup to operate
Reset Time: ............................................................< 10 ms typical at 2 x Pickup at 60 Hz
< 12 ms typical at 2 x Pickup at 50 Hz
LOCAL CONTROL MODE
Number of Elements: ........................................1
Select Before Operate Mode: ........................Disabled, Enabled
Mode:........................................................................Local Mode ON, Local Mode OFF
Display Status: .....................................................LM (local mode) displayed in banner
Tagging: ..................................................................Disabled, Enabled
CT SUPERVISION 1 (CTS)
Operating Parameter: ...................................... Ia, Ib, Ic and Ig (Fundamental Phasor Magnitude)
Va, Vb, Vc (Fundamental Phasor Magnitude)
3I0 Pickup Level:..................................................0.050 to 30.000 x CT in steps of 0.001 x CT (phase CT)
IG Pickup Level:....................................................0.050 to 30.000 x CT in steps of 0.001 x CT (ground CT)
3V0 Pickup Level:................................................0.02 to 3.00 x VT in steps of 0.01 x VT (phase VT)
Dropout Level:......................................................97% to 98% of Pickup
CTS Diff. Pickup Level:.......................................0.050 to 30.000 x CT in steps of 0.001 x CT
Quotient Pickup Level:......................................0.00 to 1.00 (lmin/lmax)
Slope Range:.........................................................0 to 100% in steps of 1%
Pickup Delay:........................................................ 0.000 to 6000.000 s in steps of 0.001 s
Level Accuracy: ................................................... For 0.1 to 2.0 x CT: ±0.5% of reading or ±0.4% of rated
(whichever is greater)
For > 2.0 x CT: ±1.5% of reading
Operate Time: ......................................................< 12 ms typical at 3 x Pickup at 60 Hz
< 15 ms typical at 3 x Pickup at 50 Hz
Timer Accuracy:..................................................±3% of delay setting or ±¼ cycle (whichever is greater) from
pickup to operate
POLE DISCORDANCE PROTECTION (52)
Operating Parameter: ......................................Contact inputs 52a and 52b per phase, Phase currents Ia, Ib,
Ic from breaker CTs
Current Limit:........................................................0.000 to 1.000 x CT in steps of 0.001 x CT
Dropout Level:......................................................97 to 98% of Current Limit
Pickup Time Delay: ............................................0.000 to 6000.000 s in steps of 0.001 s
Level Accuracy (Current):................................0.1 < I < 2.0 x CT: ±0.5% of reading or ±0.4% of rated
(whichever is greater)
I > 2.0 x CT: ±1.5% of reading
Timer Accuracy:.................................................. ±3% of operate time or ±1 cycle (whichever is greater)
SWITCH CONTROL
Operation: ..............................................................Local (PB control and SLD) and Remote (asserted FlexLogic
operands)
Function:.................................................................Opens/Closes the disconnect switch
Timers:.....................................................................0.000 to 6000.000 s in steps of 0.001 s