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345 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
SPECIFICATIONS
CHAPTER 1: INTRODUCTION
FORM-A RELAYS
Configuration: ......................................................2 (two) electromechanical
Contact material:................................................silver-alloy
Operate time:........................................................<8 ms
Continuous current:...........................................10 A
Make and carry for 0.2s:..................................30 A per ANSI C37.90
Break (DC inductive, L/R=40 ms):.................24 V / 1 A
48 V / 0.5 A
125 V / 0.3 A
250 V / 0.2 A
Break (DC resistive): ...........................................24 V / 10 A
48 V / 6 A
125 V / 0.5 A
250 V / 0.3 A
Break (AC inductive):..........................................720 VA @ 250 VAC Pilot duty A300
Break (AC resistive):............................................277 VAC / 10 A
FORM-A VOLTAGE MONITOR
Applicable voltage: ............................................20 to 250 VDC
Trickle current: .....................................................1 to 2.5 mA
FORM-C RELAYS
Configuration: ......................................................5 (five) electromechanical
Contact material:................................................silver-alloy
Operate time:........................................................<8 ms
Continuous current:...........................................10 A
Make and carry for 0.2s:..................................30 A per ANSI C37.90
Break (DC inductive, L/R=40 ms):.................24 V / 1 A
48 V / 0.5 A
125 V / 0.3 A
250 V / 0.2 A
Break (DC resistive): ...........................................24 V / 10 A
48 V / 6 A
125 V / 0.5 A
250 V / 0.3 A
Break (AC inductive):..........................................720 VA @ 250 VAC Pilot duty A300
Break (AC resistive):............................................277 VAC / 10 A
TRIP SEAL-IN
Relay 1 trip seal-in: ............................................0.00 to 9.99 s in steps of 0.01
Relay 2 trip seal-in: ............................................0.00 to 9.99 s in steps of 0.01
Power supply
HIGH RANGE POWER SUPPLY
Nominal:..................................................................120 to 240 VAC
125 to 250 VDC
Range:......................................................................60 to 300 VAC (50 and 60 Hz)
84 to 300 VDC
Ride-through time:.............................................35 ms
LOW RANGE POWER SUPPLY
Nominal:..................................................................24 to 48 VDC
Range:......................................................................20 to 60 VDC
ALL RANGES
Voltage withstand:.............................................2 × highest nominal voltage for 10 ms
Power consumption:.........................................15 W nominal, 20 W maximum
20 VA nominal, 28 VA maximum