GE 845 Instruction Manual page 26

SPECIFICATIONS
1–18
TRIP CIRCUIT MONITOR (TCM)
Applicable Voltage:............................................ 20 to 250 VDC
Trickle Current:..................................................... 1 to 2.5 mA
Timing Accuracy:................................................ ± 3 % or ± 4 ms, whichever is greater
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
BREAKER ARCING CURRENT
Mode:........................................................................ 3-pole
Principle: ................................................................. accumulates breaker duty (I
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
BREAKER HEALTH
Timer Accuracy: .................................................. ± 3% of delay setting or ± 1 cycle (whichever is greater) from
POWER FACTOR (55)
Switch-In Level:.................................................... 0.01 Lead to 1 to 0.01 Lag in steps of 0.01
Dropout Level:...................................................... 0.01 Lead to 1 to 0.01 Lag in steps of 0.01
Delay:........................................................................ 0.000 to 6000.000 s in steps of 0.001 s
Minimum Operating Voltage:........................ 0.00 to 1.25 x VT in steps of 0.01 x VT
Level Accuracy:.................................................... ± 0.02
Timer Accuracy: .................................................. ± 3% of delay setting or ± 1¼ cycle (whichever is greater)
FAULT REPORTS
Number of Reports: ........................................... 15
Captured Data: .................................................... Pre-fault and fault phasors for all CT and VT banks, pre-fault
DEMAND
Measured Values: ............................................... Phase A/B/C present and maximum current
Measurement Type:........................................... Thermal Exponential, 90% response time (programmed): 5,
Current Pickup Level: ........................................ 10 to 10000 in steps of 1 A
Dropout Level:...................................................... 96-98% of Pickup level
Level Accuracy:.................................................... ± 2%
WINDING HOTTEST-SPOT
Operating Quantity:........................................... Computed temperature in ºC
Pickup Level: ......................................................... 50 to 300ºC in steps of ºC (122ºF to 572ºF in steps of 1ºF)
Dropout Level:...................................................... 1ºC below pickup
Pickup Delay: ........................................................ 0 to 60000 minutes in steps of 1 min
AGING ACCELERATION FACTOR
Operating Quantity:........................................... Computed Aging Acceleration Factor, per-unit
Pickup Level: ......................................................... 1 pu to 10 pu in steps of 0.1 pu
Pickup Delay: ........................................................ 0 to 60000 minutes in step of 1 min
XFMR LOSS OF LIFE
Operating Quantity:........................................... Computed Accumulated Transformer Loss of Life, hours
Pickup Level: ......................................................... 0 to 300000 hours in steps of 1 hour
pickup to operate
pickup to operate
from pickup to operate
and fault trigger operands, user-programmable analog
channels 1 to 32
10, 15, 20, 30 minutes
Block Interval / Rolling Demand, time interval (programmed):
5, 10, 15, 20, 30 minutes
845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 1: INTRODUCTION
2
t) during fault