Class F stator insulation and Vacuum Pressure Impregnation (VPI)is provided.

2-Pole Turbine GeneratorsStator Winding Construction

WARRANTY

Duraguard VPI InsulationSystemThe Duraguard insulation system is avacuum pressure impregnated epoxy-micainsulation system that offers the followingbenefits:• Full Class F (155°C) Thermal Capability

• Outstanding Dielectric Properties

• Superior Moisture and ChemicalResistance

• The Superb Mechanical Integrity of anEpoxy Resin System

Stator WindingModel series 2400 and 2800 utilize fullloop multi-turn stator coils whereas forreasons of larger size Model series 3100utilizes half loop multi or single turn statorcoils. The stator is VPI’d after the statorwinding process.

Model series 3400 and 3600 for reasons oflarge size utilize half loop single turn statorcoils that are VPI’d and fully cured prior tothe stator winding process.

Strand InsulationThe strand insulation consists of polyester/glass fibers.

TranspositionsFull loop coil strands are assembled andutilize a transposition made in eachindividual turn in the end turn area.Half coil strands are assembled using aRoebel transposition.

BondingTo prevent wire movement and provide auniform solid base for ground insulation,the coil strands are bonded together underheat and pressure with a thermosettingadhesive.

Coil FormingThe coils are precisely formed using steelforming cradles.

Coil InsulationPrior to applying the ground insulation,turn insulation of multi turn coils is appliedto each turn using mica glass tape.The main ground insulation is mica glasstape. For corona protection semiconductingmaterials are applied to the outside ofthe coils.

2-Pole Turbine GeneratorsStator Winding Construction

Model series 3400 and 3600 for reasons of large size utilize half loop single turn stator coils that are VPI’d and fully cured prior to the stator winding process.

Strand InsulationThe strand insulation consists of polyester/glass fibers.

TranspositionsFull loop coil strands are assembled and utilize a transposition made in each individual turn in the end turn area.

Half coil strands are assembled using a Roebel transposition.

BondingTo prevent wire movement and provide a uniform solid base for ground insulation, the coil strands are bonded together under heat and pressure with a thermosetting adhesive.

Coil FormingThe coils are precisely formed using steel forming cradles.

Coil InsulationPrior to applying the ground insulation, turn insulation of multi turn coils is applied to each turn using mica glass tape.

The main ground insulation is mica glass tape. For corona protection semiconducting materials are applied to the outside of the coils.

Class F stator insulation and Vacuum Pressure Impregnation (VPI) is provided.

Duraguard VPI Insulation SystemThe Duraguard insulation system is a vacuum pressure impregnated epoxy-mica insulation system that offers the following benefits:

• Full Class F (155°C) Thermal Capability

• Outstanding Dielectric Properties

• Superior Moisture and Chemical Resistance

• The Superb Mechanical Integrity of an Epoxy Resin System

Stator WindingModel series 2400 and 2800 utilize full loop multi-turn stator coils whereas for reasons of larger size Model series 3100 utilizes half loop multi or single turn stator coils. The stator is VPI’d after the stator winding process.

Stator winding in progress.

MICA Tape GroundWall Insulation

DDGL Magnet Wire

Bonding Material

Conductive Tape forCorona Suppression

Stator Coil Cross Section.

Electric Machinery800 Central Avenue NEMinneapolis, Minnesota 55413United StatesTel: +1 612 378 8000Fax: +1 612 378 8051www.electricmachinery.com

© Electric Machinery 2011. Publication NA.10007.gb.11-09.01. Electric Machinery, the Electric Machinery logo and any version thereof are trademarks and service marks of Electric Machinery.The other names mentioned, registered or not, are the property of their respective companies.

WARRANTY

Winding and VPIFor Model series 2400, 2800, and 3100,the coils are carefully wound in to thestator slots. The VPI and curing processtakes place after coil winding. For Modelseries 3400 and 3600, the half coils areVPI’d and fully cured prior to winding into the stator.

After coil winding, retaining wedges areinstalled in the slots. Coil ends are firmlybraced to prevent movement due totransient or short circuit conditions. Coilsare lashed to support rings. Coil ends areseparated by pads that conform and bondto the coil sides. For Model series 3100,3400 and 3600, the top and bottomhalf of each coil are connected usingspecial connectors. Insulating materialis then applied.

VPI (Vacuum PressureImpregnation)The insulating materials and VPI epoxyresin are all components of a speciallydesigned split component system whichis designed to assure process uniformityand maximum retention of resin in theinsulating materials.For Model series 2400, 2800 and 3100 thefully wound stator goes through the VPIprocess. For Model series 3400 and 3600the coils go through the VPI process andare fully cured in fixtures prior to windinginto the stator.

www.converteam.com

Converteam Electric Machinery800 Central Avenue NEMinneapolis, Minnesota 55413United StatesTel: +1 612 378 8000Fax: +1 612 378 8051

North America Headquarters:Converteam Inc.Pittsburgh, PennsylvaniaTel: +1 412 967 0765

France Tel: +33 1 77 31 20 00Germany Tel: +49 30 76 22 0UK Tel: +44 1788 563563Brazil Tel: +55 31 3330 5800China Tel: +86 21 6442 1666India Tel: +91 44 2440 0900Russia Tel: +7 495 225 1916

Winding and VPIFor Model series 2400, 2800, and 3100, the coils are carefully wound in to the stator slots. The VPI and curing process takes place after coil winding. For Model series 3400 and 3600, the half coils are VPI’d and fully cured prior to winding in to the stator.

After coil winding, retaining wedges are installed in the slots. Coil ends are firmly braced to prevent movement due to transient or short circuit conditions. Coils are lashed to support rings. Coil ends are separated by pads that conform and bond to the coil sides. For Model series 3100, 3400 and 3600, the top and bottom half of each coil are connected using special connectors. Insulating material is then applied.

VPI (Vacuum Pressure Impregnation)The insulating materials and VPI epoxy resin are all components of a specially designed split component system which is designed to assure process uniformity and maximum retention of resin in the insulating materials.

For Model series 2400, 2800 and 3100 the fully wound stator goes through the VPI process. For Model series 3400 and 3600 the coils go through the VPI process and are fully cured in fixtures prior to winding into the stator.

TestsExtensive in process testing is performed during coil manufacturing, stator winding and on the complete stator. Tests include turn insulation testing and high potential.

Temperature DetectorsDuring the stator winding process resistance type temperature detectors (RTDs) are placed between upper and lower coil sections in the slot area to provide stator coil temperature detection. Detectors are positioned in each phase to detect the hottest portions of the windings.

Main High Voltage TerminalsThe line and neutral leads are brought out through the sides or bottom of the stator through insulating support plates. The leads project in to a larger terminal box that can be arranged for a bus duct flange or cable connection. Current transformers, potential transformers, surge capacitors and lightning arrestors can be provided as required.

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Fabrication of a half loop stator coil with Roebel transpositions.

Wound stator entering the VPI tank for impregnation.

TestsExtensive in process testing is performedduring coil manufacturing, stator windingand on the complete stator. Tests includeturn insulation testing and high potential.

Temperature DetectorsDuring the stator winding processresistance type temperature detectors(RTDs) are placed between upper andlower coil sections in the slot area toprovide stator coil temperature detection.Detectors are positioned in each phase todetect the hottest portions of the windings.

Main High Voltage TerminalsThe line and neutral leads are brought outthrough the sides or bottom of the statorthrough insulating support plates. Theleads project in to a larger terminal boxthat can be arranged for a bus duct flangeor cable connection. Current transformers,potential transformers, surge capacitorsand lightning arrestors can be providedas required.