GE 745 TRANSFORMER MANAGEMENT RELAY User Manual

GE Power Management 745 Transformer Management Relay A-1
APPENDIX A A.1 FIGURES AND TABLES
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APPENDIX A FIGURES AND TABLESA.1 FIGURES AND TABLES A.1.1 LIST OF FIGURES
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1–1: SINGLE LINE DIAGRAM ........................................................................................................................ 1-3
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1–2: 745 ORDER CODES............................................................................................................................... 1-4
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3–1: CASE DIMENSIONS............................................................................................................................... 3-1
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3–2: SINGLE AND DOUBLE SR RELAY PANEL CUTOUT ........................................................................... 3-1
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3–3: CASE MOUNTING.................................................................................................................................. 3-2
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3–4: SLIDING RELAY OUT OF CASE............................................................................................................ 3-3
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3–5: DRAWOUT SEAL.................................................................................................................................... 3-3
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3–6: REAR TERMINAL LAYOUT.................................................................................................................... 3-4
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3–7: TYPICAL WIRING DIAGRAM ................................................................................................................. 3-6
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3–8: TYPICAL WIRING DIAGRAM FOR GENERATOR STEP-UP ................................................................ 3-7
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3–9: ZERO-SEQUENCE (CORE BALANCE) CT INSTALLATION................................................................. 3-8
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3–10: CONTROL POWER CONNECTION..................................................................................................... 3-9
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3–11: DRY AND WET CONTACT CONNECTIONS ..................................................................................... 3-10
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3–12: ANALOG OUTPUT CONNECTION .................................................................................................... 3-11
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3–13: RS485 CONNECTION ........................................................................................................................ 3-12
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3–14: RS422 CONNECTION ........................................................................................................................ 3-13
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3–15: RS232 CONNECTION ........................................................................................................................ 3-13
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3–16: IRIG-B FUNCTION.............................................................................................................................. 3-14
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4–1: 745 FRONT PANEL ................................................................................................................................ 4-1
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4–2: PROGRAM PORT................................................................................................................................... 4-4
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5–1: TAP POSITION INPUT ........................................................................................................................... 5-5
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5–2: EXAMPLE TRANSFORMER................................................................................................................... 5-6
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5–3: PHASORS FOR ABC SEQUENCE......................................................................................................... 5-6
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5–4: PHASORS FOR ACB SEQUENCE......................................................................................................... 5-7
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5–5: WYE / DELTA (30× LAG) TRANSFORMER........................................................................................... 5-8
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5–6: PERCENT DIFFERENTIAL OPERATING PRINCIPLE ........................................................................ 5-47
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5–7: PERCENT DIFFERENTIAL – DUAL SLOPE CHARACTERISTIC ....................................................... 5-47
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5–8: HARMONIC DERATING CORRECTION..............................................................................................5-53
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5–9: RESTRICTED EARTH GROUND FAULT PROTECTION .................................................................... 5-59
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5–10: RESISTANCE GROUNDED WYE WINDING ..................................................................................... 5-59
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5–11: FAULT CURRENTS VS. FAULT POINT FROM NEUTRAL ............................................................... 5-60
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5–12: RGF AND PERCENT DIFFERENTIAL ZONES OF PROTECTION ................................................... 5-60
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5–13: RESTRICTED GROUND FAULT IMPLEMENTATION....................................................................... 5-61
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5–14: FLEXLOGIC™ EXAMPLE................................................................................................................... 5-82
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5–15: FLEXLOGIC EXAMPLE IMPLEMENTED ........................................................................................... 5-83
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5–16: INVERSE CURVE 1............................................................................................................................ 5-97
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5–17: INVERSE CURVE 2............................................................................................................................ 5-98
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5–18: INVERSE CURVE 3............................................................................................................................ 5-99
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7–1: DIFFERENTIAL SCHEME LOGIC – PERCENT DIFFERENTIAL .......................................................... 7-2
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7–2: DIFFERENTIAL SCHEME LOGIC – 5TH HARMONIC INHIBIT............................................................. 7-3
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7–3: DIFFERENTIAL SCHEME LOGIC – ENERGIZATION INHIBIT ............................................................. 7-4
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7–4: DIFFERENTIAL SCHEME LOGIC – ENERGIZATION INHIBIT ............................................................. 7-5
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7–5: DIFFERENTIAL SCHEME LOGIC – 5TH HARMONIC INHIBIT............................................................. 7-6
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7–6: INSTANTANEOUS DIFFERENTIAL SCHEME LOGIC........................................................................... 7-7
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7–7: PHASE TIME O/C SCHEME LOGIC....................................................................................................... 7-8
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7–8: PHASE INST O/C 1 SCHEME LOGIC.................................................................................................... 7-9
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7–9: PHASE INST O/C 2 SCHEME LOGIC.................................................................................................. 7-10
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7–10: NEUTRAL TIME O/C SCHEME LOGIC.............................................................................................. 7-11
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7–11: NEUTRAL INST O/C 1 SCHEME LOGIC ........................................................................................... 7-12
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7–12: NEUTRAL INST O/C 2 SCHEME LOGIC ........................................................................................... 7-13
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7–13: GROUND TIME O/C SCHEME LOGIC............................................................................................... 7-14
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7–14: GROUND INST O/C 1 SCHEME LOGIC ............................................................................................ 7-15
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7–15: GROUND INST O/C 2 SCHEME LOGIC ............................................................................................ 7-16
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7–16: RESTRICTED GROUND FAULT SCHEME LOGIC ........................................................................... 7-17
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7–17: NEGATIVE SEQUENCE TIME O/C SCHEME LOGIC ....................................................................... 7-18
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7–18: NEGATIVE SEQUENCE INST O/C SCHEME LOGIC........................................................................ 7-19
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7–19: UNDERFREQUENCY SCHEME LOGIC ............................................................................................ 7-20

GE 745 TRANSFORMER MANAGEMENT RELAY Specifications

General

Brand	GE
Model	745 TRANSFORMER MANAGEMENT RELAY
Category	Relays
Language	English