8.1-2 Typical soleplate arrangement as seen under the stator frame.Figure 8.1-3 Shows solid rectangular key with grease fitting for lubrication...Figure 8.1-4 Shows original soleplate arrangement – Teflon™ pucks not ...Figure 8.1-5 Shows soleplate with Teflon™ puck inserts in a steel hous...Figure 8.1-6 Shows mating steel surfaces on stator frame.Figure 8.1-7 Shows completed soleplate arrangement from inside stator frame ...Figure 8.1-8 Shows outer blocks welded to the frame ring.Figure 8.1-9 Shows center block which aids radial freedom and prevents tange...Figure 8.1-10 Shows welded/integral soleplate.Figure 8.1-11 Showing soleplate nut and stator hold‐down bolt.Figure 8.1-12 Shows hold-down bolt individual components.Figure 8.1-13 Shows assembled hold down bolt without the stator in place.Figure 8.1-14 Shows soleplate arrangement that does not allow radial expansi...Figure 8.1-15 Shows removable dowel pins similar to the ones in Figure 8.1-1...Figure 8.1-16 Shows grout pocket cracking.Figure 8.1-17 Shows foundation cracking.Figure 8.2-1 Shows frame welds.Figure 8.2-1 Shows stator frame‐split complete with a dowel and bolted arran...Figure 8.2-3 Shows metal filings in a new generator.Figure 8.2-4 Shows a light coating of contamination on the shelves and core ...Figure 8.2-5 Shows a significant amount of oil from a bearing leak.Figure 8.3-1 Shows that the core flares a small amount around the I‐beam ass...Figure 8.3-2 Shows core is more uniform and does not droop around the I‐beam...Figure 8.3-3 Shows stator core air ducts choking off airflow.Figure 8.4-1 Shows laminar fretting and missing pieces of stator core on the...Figure 8.4-2 Shows laminations found at bottom of generator pit.Figure 8.4-3 Shows piece of lamination on rotor pole.Figure 8.4-4 Shows degradation of the stator laminations, core finger, and w...Figure 8.4-5 Shows excellent core‐to‐keybar interface with no broken laminat...Figure 8.4-6 Shows fretting and broken and missing lamination pieces.Figure 8.4-7 Shows lamination shift at the very top of the core under clampi...Figure 8.4-8 Shows knife penetration of laminations.Figure 8.4-9 Core‐to‐keybar fretting – subtle beginning.Figure 8.4-10 Shows split axial misalignment.Figure 8.4-11 Shows minor smearing after repairs.Figure 8.4-12 Shows split paper still in place.Figure 8.4-13 Shows split fretting (red‐orange dust).Figure 8.4-14 Shows split that has been repacked by the OEM.Figure 8.4-15 Shows chevroning of the core.Figure 8.4-16 Shows stator core step punching fretting.Figure 8.4-17 Shows weeping epoxy (red color) on the laminations to consolid...Figure 8.4-18 Shows severe stator core step punching fretting and subsequent...Figure 8.4-19 Shows clamping plate removed exposing the finger assembly.Figure 8.4-20 Shows the fingers/heavy lamination and clamping plate assembly...Figure 8.4-21 Shows welded fingers to the clamping plate.Figure 8.4-22 Shows a gap between the clamping finger and stator core lamina...Figure 8.4-23 Shows insulating repair wedge epoxied in place (red color is e...Figure 8.5-1 Shows a typical clamping plate and finger assembly.Figure 8.5-2 Shows clamping fingers welded to the heavy lamination.Figure 8.5-3 Shows assembled clamping plate and the fingers with heavy lamin...Figure 8.5-4 Shows two fingers into the airgap and one finger machining the ...Figure 8.5-5 Shows crooked clamping finger.Figure 8.5-6 Shows bare stator frame before piling of core with keybars and ...Figure 8.5-7 Shows insulated core clamping studs that go through the core as...Figure 8.5-8 Shows the core stud and keybar attachment to the frame.Figure 8.5-9 Shows the core keybar/stud attachment to the frame.Figure 8.5-10 Shows keybar support gusset weld crack.Figure 8.5-11 Shows the gusset cracked as well as the weld.Figure 8.5-12 Shows another example of weld cracking.Figure 8.6-1 Shows chunks of insulation missing.Figure 8.6-2 Shows tape separation as evidenced by the black area on the end...Figure 8.6-3 Shows girth cracking (necking) evidenced by the separation of g...Figure 8.6-4 Shows partial discharge (white powder) at the interface.Figure 8.6-5 Shows extreme deterioration of the semi‐con/grading interface....Figure 8.7-1 Shows bypassed stator bar.Figure 8.7-2 Shows resistor on bottom end of winding into bypassed bar.Figure 8.8-1 Shows normal wedge installation.Figure 8.8-2 Shows filler migration.Figure 8.8-3 Shows center filler migrating out the bottom of the winding.Figure 8.8-4 Shows the black packing strip (at bottom of slot) migrating out...Figure 8.8-5 Shows felt and lashing added to prevent wedge and filler migrat...Figure 8.8-6 Shows wedge fretting and evidence of greasing on core packet.Figure 8.8-7 Shows silicone applied to the endwinding with insufficient clea...Figure 8.8-8 Shows bull ring and bull ring support.Figure 8.8-9 Circuit rings sitting inside the red blocking and lashed.Figure 8.8-10 Shows another style of circuit ring arrangement.Figure 8.8-11 Shows a completed brazed connection.Figure 8.8-12 Shows completed taped and epoxy encapsulated brazed connection...Figure 8.8-13 Shows encapsulation or end caps for a bar winding.Figure 8.8-14 Shows jumper connections encapsulated.Figure 8.8-15 Shows open type series connection.Figure 8.8-16 Shows rivet fastener on copper clip.Figure 8.10-1 Shows a more modern encapsulated type of current transformer....Figure 8.10-2 Shows older style taped CT.
9 Chapter 9Figure 9.0-1 Example of a cast spider and rim arrangement.Figure 9.0-2 Shows larger cast spider with laminated shrunk rim.Figure 9.1-1 Shows spider arms and support shelves that support the mass of ...Figure 9.1-2 Shows enlarged side view of an undamaged spider support shelf....Figure 9.1-3 Shows enlarged side view of support shelf with greasing and dep...Figure 9.1-4 Shows underside of Figure 9.1-3 with greasing at interface.Figure 9.1-5 Shows support shelf sheared off from a fatigue failure.Figure 9.1-6 Normal view of the side of a support shelf – no fretting or gre...Figure 9.1-7 Shows normal underside view of support shelf – no fretting dust...Figure 9.1-8 Shows crack on support shelf.Figure 9.1-9 Shows newly installed support brace on one side (other side not...Figure 9.1-10 Shows up close view of new support brace on the rim ledge.Figure 9.1-11 Shows a typical spider (drum style) assembly.Figure 9.1-12 Shows drum from Figure 9.1-11 with rim lamination stacking in ...Figure 9.1-13 Shows rim support shelf on drum design with fretting dust pres...Figure 9.1-14 Shows crack on spider post where weld ends on torque block.Figure 9.1-15 Shows air vanes where cracks tend to initiate.Figure 9.1-16 Shows crack where spider arms meet at hub.Figure 9.1-17 Shows crack on spider arm near rotor field leads attachment po...Figure 9.1-18 Shows shaft coupling bolts.Figure 9.2-1 Shows a rim key on a shrunk rim in excellent condition.Figure 9.2-2 Shows another style of rim key that is clean and free from fret...Figure 9.2-3 Shows rim keys installed with no visual on sides.Figure 9.2-4 Shows clean fretting free key inside rotor.Figure 9.2-5 Shows rim key on rotor rim with no fretting.Figure 9.2-6 Shows minor signs of fretting on rim keys (rim key from Figure ...Figure 9.2-7 Shows fretting dust inside the keyway and collection on the rim...Figure 9.2-8 Shows rim keys with fretting dust as collected on the white rag...Figure 9.3-1 Shows amortisseur missing from field pole.Figure 9.3-2 Shows localized burning of the laminations in contact with the ...Figure 9.3-3 Pump generator pole shows amortisseur bars and brazed connectio...Figure 9.3-4 Shows cracked braze and shorting bar for amortisseur.Figure 9.3-5 Shows severe damage to amortisseur circuit assembly on a pump g...Figure 9.3-6 Shows severe pole lamination damage.Figure 9.3-7 Shows a field pole with missing amortisseur bars.Figure 9.3-8 Leaf spring assembly to compress and position the coil on the p...Figure 9.3-9 Illustration of how the leaf springs are installed on the rotor...Figure 9.3-10 Shows side view illustration of Figure 9.3-8 when installed.Figure 9.3-11 Sketch showing spring inside rim pushing against bottom collar...Figure 9.3-12 Illustrates position of spring on bottom collar from Figure 9....Figure 9.3-13 Shows a potted pole with no field collar.Figure 9.3-14 Shows “slip plane” material used in between collar and last tw...Figure 9.3-15 Shows inter‐polar wedge.Figure 9.3-16 Shows typical field pole inter‐connector.Figure 9.3-17 Shows severely damaged field winding.Figure 9.3-18 Shows rim damage when field winding melted.Figure 9.3-19 Shows new omega style flexible connector.Figure 9.3-20 Shows braided interpole flexible connector.Figure 9.3-21 Shows a copper laminated leaf type connector not yet assembled...Figure 9.3-22 Shows flexible braided amortisseur connectors.Figure 9.3-23 Shows a rigid amortisseur connection.Figure 9.3-24 Shows a double “T” style pole key arrangement.Figure 9.3-25 Shows a typical dovetail style key arrangement.Figure 9.3-26 Shows pole key keeper plate.Figure 9.3-27 Shows red marks where cracks could initiate on a dovetail asse...Figure 9.3-28 Shows red marks where cracks could initiate on a T‐style assem...Figure 9.3-29 Shows cracks in rim laminations in attachment area.Figure 9.3-30 Shows close‐up view of rim lamination cracks from Figure 9.3-2...Figure 9.3-31 Shows large crack in end plate.Figure 9.3-32 Shows crack on T‐head.Figure 9.3-33 Shows a portion of the T‐head missing on end plate and on lami...Figure 9.3-34 Shows field leads as they connect to the field poles.Figure 9.4-1 Shows typical brake assembly.Figure 9.4-2 Shows newly installed brake track segment.Figure 9.4-3 Shows an alternate style brake assembly with no springs and pro...
10 Chapter 10Figure 10.1-1 Shows older style field