Outputs - GE 845 Instruction Manual

CHAPTER 1: INTRODUCTION

Outputs

845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
TAP CHANGER
Operating Parameter:.......................................BCD
Tap Changer Range:..........................................-19 to +39
Accuracy: ................................................................Per Input accuracy
TRIP/CLOSE OUTPUT RELAYS
(Relays #1 and #2 from Slot F, Relays #9 and #10 from Slot G)
Type:..........................................................................FORM-A
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
Break (DC resistive):............................................24 V / 10 A
Break (AC inductive): ..........................................720 VA @ 250 VAC Pilot duty A300
Break (AC resistive): ............................................277 VAC / 10 A
Operation Mode:..................................................Self-Reset, Latched, Pulsed, Non-Failsafe, Failsafe
FORM-A VOLTAGE MONITOR
Applicable voltage:.............................................20 to 250 VDC
Trickle current:......................................................1 to 2.5 mA
Timer acurracy: ...................................................± 3% of operate time or ± 1/4 cycle (whichever is greater)
AUXILIARY OUTPUT RELAYS
(Relays #3, #4 and the Critical Failure Relay from Slot F, and Relays #11, #12 and #16 from
Slot G)
Type:..........................................................................FORM-C
Configuration:.......................................................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
Break (DC resistive):............................................24 V / 10 A
Break (AC inductive): ..........................................720 VA @ 250 VAC Pilot duty A300
Break (AC resistive): ............................................277 VAC / 10 A
Operation Mode:..................................................Self-Reset, Latched, Pulsed, Non-Failsafe, Failsafe
Breaking Capacity: .............................................For Form-C relays the following ratings are applied to meet
48 V / 0.5 A
125 V / 0.3 A
250 V / 0.2 A
48 V / 6 A
125 V / 0.5 A
250 V / 0.3 A
48 V / 0.5 A
125 V / 0.3 A
250 V / 0.2 A
48 V / 6 A
125 V / 0.5 A
250 V / 0.3 A
UL508 requirements: 1 second "ON"/10 seconds "OFF" per
output relay at maximum rating
SPECIFICATIONS
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