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CHAPTER 1: INTRODUCTION
Controls
Inputs/Outputs
345 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
Courtesy of NationalSwitchgear.com
CLOCK
Setup:........................................................................Date and time
IRIG-B:.......................................................................Auto-detect (DC shift or Amplitude Modulated)
LOGIC ELEMENTS
Number of logic elements: .............................16
Trigger source inputs per element: ............3
Block inputs per element: ...............................3
Supported operations: .....................................AND, OR, NOT, Pickup / Dropout timers
Pickup timer:..........................................................0 to 60000 ms in steps of 1 ms
Dropout timer: ......................................................0 to 60000 ms in steps of 1 ms
BREAKER FAILURE
Pickup Level:..........................................................0.05 to 20.00 x CT in steps of 0.01 x CT
Dropout Level: ......................................................97 to 98% of pickup
Timer 1 Delay: ......................................................0.03 to 1.00 s in steps of 0.01 s
Timer 2 Delay: ......................................................0.00 to 1.00 s in steps of 0.01 s
Time Delay Accuracy: .......................................0 to 1 cycle (Timer 1, Timer 2)
Level Accuracy:....................................................per CT input
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
CONTACT INPUTS
Inputs:.......................................................................10
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
Daylight Saving Time
Amplitude modulated: 1 to 10 V pk-pk
DC shift: 1 to 10 V DC
Input impedance: 40 kOhm ± 10%
RTC Accuracy: ± 1 min / month at 25°C
SPECIFICATIONS
1–11
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