Mechanical Dynamics & Analysis (MD&A) completed a carefully coordinated 7FA gas turbine hot gas path inspection, 7FH2 generator inspection, and repairs in just 19 days, providing all services, labor, and parts. The customer contracted MD&A to perform the inspection and emergent repairs on a tight schedule. Our industry experts completed the work on time maintaining […]
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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 can lead […]
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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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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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Read Electric GENERATORS 2018 Annual Review, a special report by CCJ. It is compiled 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 the 2018 GUG conference where our experts are presenting […]
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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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Insulated devices known as bushings enable an electrical conductor to pass safely through a grounded conducting barrier. Generator bushings are designed to lead current induced in the stator windings through the pressurized, hydrogen-gas tight, earthed generator housing. A typical bushing consists of a conductor surrounded by insulation, except for the terminal ends. As part of […]
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Mechanical Dynamics and Analysis (MD&A) was retained by a utility to perform a stub-shaft repair of a generator rotor collector-end shaft. The customer reported that the generator rotor had suffered a collector ring failure and also a ground to the main shaft. Major arcing and heat damage occurred to the generator rotor forging shaft. The […]
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For many years, the OEM fix for major cracking or shell distortion was the replacement of the defective shell, also referred to as casing by some OEMs, with new. Mechanical Dynamics and Analysis has provided an alternative to shell replacements that include fixing the existing shell to extend its life. MD&A welded and repaired the […]
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