PP42 Rev A

Page 1 of 4 COPYRIGHT, 2008, GE PACKAGED POWER, L.P.,ALL RIGHTS RESERVED. THIS DRAWING IS THE PROPRIETARY AND/OR CONFIDENTIAL PROPERTY OF GE

PACKAGED POWER, L.P., AND IS LOANED IN STRICT CONFIDENCE WITH THE UNDERSTANDING THAT IT WILL NOT BE REPRODUCED NOR USED FOR ANY PURPOSE

EXCEPT THAT FOR WHICH IT IS LOANED. IT SHALL BE IMMEDIATELY RETURNED ON DEMAND, AND IS SUBJECT TO ALL OTHER TERMS AND CONDITIONS OF ANY

WRITTEN AGREEMENT OR PURCHASE ORDER WHICH INCORPORATES OR RELATES TO THIS DRAWING.

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AC Generator Electrical Phase Sequence

Introduction GE supplies AC generators with standard electrical phase sequence in accordance to ANSI and IEC industry standards. This position paper describes phase sequence convention and recommended instructions for connecting up to switchgear. Description GE Aero Energy provides LM2X (LM2500, LM2500+, LM2500+G4), LM6000 and LMS100 gas turbine generator packages, where each have their own unique electrical phase rotation based on mechanical rotation, hot end or cold end drive, and if driven from mechanical speed reduction gearbox. For ANSI designated applications generator terminals on left side when looking on the non-drive end bearing is labeled left, center, right: T1, T2, T3 and on right side T4-T5-T6. For IEC designated applications generator terminals on left side are labeled left, center right: U1, V1, W1 and on right side U2, V2, W2. For dual rated application generators the terminals are dual marked with both ANSI and IEC labels. Generator mechanical and electrical rotation for Aero gas turbines is determined by design. Reference Table 1: AC Generator Mechanical Electrical Phase Rotation.

LM Package

Hertz

PTO

Connection

Gearbox

Mechanical Rotation

Looking on NDE Bearing

Electrical Phase

Rotation

Industry Rotation

LM2500, +, G4 60 Hot End No CW T1, T2, T3 a, b, c

LM2500, + 50 Hot End No CW T1, T2, T3 a, b, c

LM2500 G4 50 Hot End Yes CCW T1, T3, T2 a, c, b

LM6000 PA-PF 60 Cold End No CCW T1, T3, T2 a, c, b

LM6000 PA-PF 60 Hot End No CW T1, T2, T3 a, b, c

LM6000 PA-PF 50 Cold End Yes CW T1, T2, T3 a, b, c

LMS100 PA-PB 50/60 Hot End No CW T1, T2, T3 a, b, c

Table 1 AC Generator Mechanical Electrical Phase Rotation

GE Energy Aero Energy Division

Position Paper #42

Rev A

Date: January 08, 2008

16415 Jacintoport Blvd

Houston, TX 77015

USA T 001-281-864-2803

F 001-281-864-2459

PP42 Rev A

Page 2 of 4 COPYRIGHT, 2008, GE PACKAGED POWER, L.P.,ALL RIGHTS RESERVED. THIS DRAWING IS THE PROPRIETARY AND/OR CONFIDENTIAL PROPERTY OF GE

PACKAGED POWER, L.P., AND IS LOANED IN STRICT CONFIDENCE WITH THE UNDERSTANDING THAT IT WILL NOT BE REPRODUCED NOR USED FOR ANY PURPOSE

EXCEPT THAT FOR WHICH IT IS LOANED. IT SHALL BE IMMEDIATELY RETURNED ON DEMAND, AND IS SUBJECT TO ALL OTHER TERMS AND CONDITIONS OF ANY

WRITTEN AGREEMENT OR PURCHASE ORDER WHICH INCORPORATES OR RELATES TO THIS DRAWING.

Standard mechanical direction of rotation for AC generators is clockwise (CW) when facing the generator non-drive end and will generate electrical phase sequence T1(U1), T2(V1), T3(W1). Reference Sketch 1: Generator Terminal Locations CW Vector Chart.

Sketch 1 Generator Terminal Locations CW Vector Chart

AC generators driven counterclockwise (CCW) when facing the generator non-drive end will generate electrical phase sequence T1(U1), T3(W1), T2(V1). Reference Sketch 2: Generator Terminal Locations CCW Vector Chart.

Sketch 2 Generator Terminal Locations CCW Vector Chart

PP42 Rev A

Page 3 of 4 COPYRIGHT, 2008, GE PACKAGED POWER, L.P.,ALL RIGHTS RESERVED. THIS DRAWING IS THE PROPRIETARY AND/OR CONFIDENTIAL PROPERTY OF GE

PACKAGED POWER, L.P., AND IS LOANED IN STRICT CONFIDENCE WITH THE UNDERSTANDING THAT IT WILL NOT BE REPRODUCED NOR USED FOR ANY PURPOSE

EXCEPT THAT FOR WHICH IT IS LOANED. IT SHALL BE IMMEDIATELY RETURNED ON DEMAND, AND IS SUBJECT TO ALL OTHER TERMS AND CONDITIONS OF ANY

WRITTEN AGREEMENT OR PURCHASE ORDER WHICH INCORPORATES OR RELATES TO THIS DRAWING.

Connecting Aero Energy AC generator Lineside cubicle terminals to switchgear is typically done with cable, cable bus or non-segregated bus duct. For LMS100 applications Isolated Phase Bus is typically used due to higher current flow. When interfacing CW rotation AC generators to switchgear, and its desired to achieve industry standard a, b, c, connections are routed directly from generator terminals to switchgear. Reference Sketch 3: Connecting CW Rotation Generators to Switchgear.

Sketch 3 Connecting CW Rotation Generators to Switchgear

When interfacing CCW rotation AC generators to switchgear, and its desired to achieve industry standard a, b, c, a phase transposition is incorporated between generator terminals and switchgear. See Sketch 4, Connecting CCW Rotation Generators to Switchgear.

Sketch 4 Connecting CCW Rotation Generators to Switchgear

PP42 Rev A

Page 4 of 4 COPYRIGHT, 2008, GE PACKAGED POWER, L.P.,ALL RIGHTS RESERVED. THIS DRAWING IS THE PROPRIETARY AND/OR CONFIDENTIAL PROPERTY OF GE

PACKAGED POWER, L.P., AND IS LOANED IN STRICT CONFIDENCE WITH THE UNDERSTANDING THAT IT WILL NOT BE REPRODUCED NOR USED FOR ANY PURPOSE

EXCEPT THAT FOR WHICH IT IS LOANED. IT SHALL BE IMMEDIATELY RETURNED ON DEMAND, AND IS SUBJECT TO ALL OTHER TERMS AND CONDITIONS OF ANY

WRITTEN AGREEMENT OR PURCHASE ORDER WHICH INCORPORATES OR RELATES TO THIS DRAWING.

Conclusion

AC generator electrical phase sequence must match plant and utility electrical phase sequence. During commissioning and synchronizing to system the first time, adequate tests should be conducted to verify phase sequence is correct. GE Aero Energy provides AC generators with standard electrical phase sequence. Non-standard electrical phase sequence generators can be provided if requested in advance of order.

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