CHAPTER 1: INTRODUCTION
SPECIFICATIONS
350 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
1–17
Monitoring
BREAKER HEALTH
Timer Accuracy: ..................................................± 3% of delay setting or ± 1 cycle (whichever is greater) from
pickup to operate
DEMAND
Measured Values:................................................Phase A/B/C present and maximum current, three-phase
present and maximum real/reactive/apparent power
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
Real Power Pickup Level:.................................0.1 to 300000.0 in steps of 0.1 kW
Reactive Power Pickup Level:........................0.1 to 300000.0 in steps of 0.1 kVar
Apparent Power Pickup Level: ......................0.1 to 300000.0 in steps of 0.1 kVA
Dropout Level: ......................................................96-98% of Pickup level
Level Accuracy:....................................................± 2% (current demand only)
Inputs
CONTACT INPUTS
Inputs:.......................................................................10
Selectable thresholds:.......................................17, 33, 84, 166 VDC
±10%
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
PHASE & GROUND CURRENT INPUTS
CT Primary: ............................................................1 to 6000 A
Range: ......................................................................0.02 to 20 × CT
Input type:..............................................................1 A, 5 A, or 1/5 A (must be specified with order)
Nominal frequency:...........................................50/60 Hz
Burden: ....................................................................<0.1 VA at rated load
Accuracy:................................................................3%
±10 mA or ±20% of reading from 0.02 to 0.19 × CT, whichever
is greater
CT withstand: ........................................................1 second at 100 A (1 A option)
1 second at 400 A (5 A or universal CT option)
2 seconds at 40 × rated current
continuous at 3 × rated current
