GE MI-869

1–18 869 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
SPECIFICATIONS CHAPTER 1: INTRODUCTION
Monitoring
BREAKER ARCING CURRENT
Mode:........................................................................ 3-pole
Principle: .................................................................accumulates breaker duty (I
2
t) during fault
Initiation:.................................................................any operand
Alarm Threshold:................................................. 0 to 50000 kA2-cycle in steps of 1 kA2-cycle
Timer Accuracy: ..................................................± 3% of delay setting or ± ¼ cycle (whichever is greater) from
pickup to operate
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
BREAKER HEALTH
Timer Accuracy: ..................................................± 3% of delay setting or ± 1 cycle (whichever is greater) from
pickup to operate
BROKEN ROTOR BAR
Operating Parameter: ......................................Fundamental Phasor Magnitude
Pickup Level: .........................................................-60db to -12db in steps of -1dB
Dropout Level:......................................................97 to 98% of Pickup
CLOSE CIRCUIT MONITOR (CCM)
Applicable Voltage:............................................20 to 250 VDC
Trickle Current:.....................................................1 to 2.5 mA
Timing Accuracy:................................................± 3 % or ± 4 ms, whichever is greater
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%
FAULT REPORTS
Number of Reports: ...........................................15
Captured Data: ....................................................Pre-fault and fault phasors for all CT and VT banks, pre-fault
and fault trigger operands, user-programmable analog
channels 1 to 32
HARMONIC DETECTION
Operating Parameter: ......................................Current 2
nd
, 3
rd
, 4
th
, 5
th
harmonic or THD per phase
Timer Accuracy: .................................................. Harmonics: ±3% of delay setting or ±1/4 cycle (whichever is
greater) from pickup to operate
THD: ±3% of delay setting or ±3 cycles (whichever is greater)
from pickup to operate