Generator

Alstom® Generator Pole to Pole Connector Modification

pole to pole connectors

The legacy Alstom® Topair WX/Y23Z and WX/Y21Z generator fleets can experience quality issues with the pole to pole connectors. Specifically, indications of cracking have been found on the braze interface and the pole to pole connectors themselves. This condition has affected the 60Hz 23Z fleet and both the 50Hz and 60Hz 21Z fleets. These issues […]

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MD&A Solution for 7FH2 & 324 Stator End Winding Dusting Issues

Stator End winding

Over the past decade, there have been several reports of dusting on the GE® 7FH2 & 324 stator end-winding systems. The dusting has been found on earlier and late model generators. GE®  7FH2 and 324 type generators have a history of end-winding dusting as a result of materials used during manufacturing. A major contributor to […]

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Generator Rotor Slot Tooth Weld Repair

Mechanical Dynamics & Analysis (MD&A) experts recently performed a Generator Rotor Slot Tooth Weld Repair. Initially, the generator rotor suffered a double ground fault incident that tripped the unit offline. The customer contacted MD&A to perform disassembly, testing, and evaluation of the condition of the unit. Once the generator rotor was removed, visual inspections confirmed melted […]

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Generator Field Support Platform

Generator Field Support Platform

Mechanical Dynamics & Analysis (MD&A) experts have constructed a generator field support platform to allow for removal of the field when performing a 7FH2 Generator Major Inspection. Rotor field inspections can either be performed on-site or in a shop environment.  Repairs generally require the rotor field to be transported to a qualified repair facility.  MD&A […]

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Electric Generators 2018 Annual Review

Electric Generators

Read Electric GENERATORS 2018 Annual Review, a special report by CCJ.  It is complied from presentations made at the third GUG (Generator Users Group) conference from last August.  Electric Generators Review (PDF) MD&A is an exclusive sponsor and can meet all your generator needs! See you at 2018 GUG conference where our experts are presenting again! […]

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In-Place Stationary Shaft Machining Capabilities

MD&A continues to enhance our “one-stop shop” capabilities for customers, most recently through the addition of in-place stationary shaft machining. In-place stationary shaft machining allows MD&A to repair damaged journals, collector rings, and seal areas without removing turbine and generator rotors from the unit. The compact setup easily fits under LP hood radii to allow […]

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Emergent Generator Re-wedge

re-wedge

Mechanical Dynamics & Analysis (MD&A) performed an emergent generator rewedge for a 260 MW Alstom® generator on-site in Mexico. The original work scope involved electrical testing of the generator rotor and stator, along with the removal of the retaining rings to inspect the insulation and blocking under the rings. Upon inspection of the stator, greasing […]

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MD&A 7FH2 Spring Migration Repair

Mechanical Dynamics & Analysis’ (MD&A) experts offer a unique, patented repair process that eliminates the axial migration of slot leaf springs within 7FH2 generator fields.  This repair can also be applied to 324 generator fields. The blockage of the radial ventilation passages results in reduced hydrogen gas cooling flow, which can lead to thermal instabilities […]

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Mechanical Dynamics & Analysis LLC   |   19 British American Blvd., Latham, NY 12110   |   P (518) 399-3616   |   F (518) 399-3929