CHAPTER 1: INTRODUCTION SPECIFICATIONS
350 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL 1–11
BREAKER FAILURE
Pickup Level:..........................................................0.05 to 20.00 x CT in steps of 0.01
Dropout Level: ......................................................97 to 98% of pickup
Time Delay Accuracy:.......................................0 to 1 cycle (Timer 1, Timer 2)
Level Accuracy:....................................................per CT input
BREAKER TRIP COUNTER
Trip Counter Limit (Pickup):.............................1 to 10000 in steps of 1
COLD LOAD PICKUP BLOCKING
Operation:...............................................................Automatically (current level), or by command (asserted input)
Function: .................................................................Block IOC functions, raise TOC pickup, for selected period of
time
Time Delay Accuracy:.......................................0 to 1 cycle (block Time)
±50 ms (outage time ≤5 min)
±1 s (outage time > 5 min)
AMBIENT TEMPERATURE
High Temperature Pickup:..............................20°C to 80°C in steps of 1°C
Low Temperature Pickup: ...............................-40°C to 20°C in steps of 1°C
Time Delay:............................................................1 to 60 min in steps of 1 min
Temperature Dropout:......................................Configurable 90 to 98% of pickup
Temperature Accuracy: ...................................±10°C
Timing Accuracy: ................................................±1 second
Inputs
CONTACT INPUTS
Inputs:.......................................................................10[8]
Selectable thresholds: ......................................17, 33, 84, 166 VDC
Recognition time:................................................1/2 cycle
Debounce time: ...................................................1 to 64 ms, selectable, in steps of 1 ms
Maximum input voltage & continuous
current draw:...................................................300 VDC, 2 mA, connected to Class 2 source
Type:..........................................................................opto-isolated inputs
External switch: ...................................................wet contact
NOTE:
The number of contact inputs - 8 or 10 - is dependent on the order code selected.
PHASE & GROUND CURRENT INPUTS
CT Primary:.............................................................1 to 6000 A
Range: ......................................................................0.02 to 20 × CT
Input type: ..............................................................1 A or 5 A (must be specified with order)
Nominal frequency: ...........................................50/60 Hz
Burden: ....................................................................<0.1 VA at rated load
Accuracy:................................................................±1% of reading at 1× CT
±3% of reading from 0.2 to 20 × CT
±20% of reading from 0.02 to 0.19 × CT
CT withstand: ........................................................1 second at 100 × rated current
2 seconds at 40 × rated current
continuous at 3 × rated current
Courtesy of NationalSwitchgear.com
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