{"id":77875,"date":"2026-02-26T09:28:26","date_gmt":"2026-02-26T14:28:26","guid":{"rendered":"https:\/\/www.mdaturbines.com\/?p=77875"},"modified":"2026-02-26T09:28:26","modified_gmt":"2026-02-26T14:28:26","slug":"generator-field-replacement","status":"publish","type":"post","link":"https:\/\/www.mdaturbines.com\/resources\/generator-field-replacement\/","title":{"rendered":"7FH2 Generator Field Replacement with Stator Rewind"},"content":{"rendered":"<p>MD&amp;A was contracted to perform a Generator Major inspection, to provide a GE\u00ae 7FH2 Generator Field Replacement and perform an onsite <a href=\"https:\/\/www.mdaturbines.com\/resources\/generator-stator-rewind\/\">Stator Rewind<\/a>. The scope included full disassembly, <a href=\"https:\/\/www.mdaturbines.com\/services\/generator\/generator-testing-inspections\/\">mechanical inspection<\/a>, maintenance and replacement of related <a href=\"https:\/\/www.mdaturbines.com\/parts\/generator\/miscellaneous-generator-components\/\">components<\/a> to accommodate the new rotor. The generator field that was extracted onsite received a field rewind and <a href=\"https:\/\/www.mdaturbines.com\/repairs\/generator\/high-speed-balance\/\">high speed balance<\/a>, and was placed into the MD&amp;A\u2019s field exchange fleet.<\/p>\n<p>MD&amp;A has an inventory of new or refurbished generator fields in our <a href=\"https:\/\/www.mdaturbines.com\/parts\/spare-assets\/#generator-field\">field exchange fleet<\/a>, featuring the latest in rewind technologies. Additionally, we have <a href=\"https:\/\/www.mdaturbines.com\/parts\/spare-assets\/#rewind-kit\">stator rewind kits<\/a> with <a href=\"https:\/\/www.mdaturbines.com\/parts\/generator\/generator-stator-bars\/\">stator bars<\/a> available in stock, ready to support planned or forced outages.<\/p>\n<p><strong>Disassembly and Component Inspection<\/strong><\/p>\n<p>MD&amp;A\u2019s experts disassembled the generator and inspected critical components in the process.<\/p>\n<p>Our team conducted visual and non-destructive examinations (NDE) on the load coupling Riverhawk bolting. No indications were found &#8211; all components successfully passed VT and UT requirements before being returned to service. The unit\u2019s generator bearings were also inspected dimensionally and visually by our technicians before being sent to <a href=\"https:\/\/www.mdaturbines.com\/resources\/bearings-seals-hydraulics-facility-tour\/\">MD&amp;A\u2019s Bearing, Sealing and Hydraulics Division<\/a> for refurbishment and sizing to ensure proper fit for the new field journals.<\/p>\n<p>Rotor fan blades were removed, hand-cleaned, and subjected to NDE and visual inspection before being returned to service with new locktabs during the final installation. Hydrogen seal components were also examined, with MD&amp;A providing new seals properly sized to the refurbished rotor configuration and lapped to the refurbished gland specifications.<\/p>\n<p>Our technicians sent the H2 gland seals to MD&amp;A\u2019s Bearing, Sealing and Hydraulics Division for segment replacement and housing refurbishment. Oil deflectors were \u00a0modified for insertable teeth design before being reinstalled and aligned to shaft specifications. In addition, our experts removed and replaced the old seal carrier.<\/p>\n<p><strong>Stator Rewind<\/strong><\/p>\n<p>During this planned outage, MD&amp;A\u2019s team performed a full stator rewind. Our onsite experts performed baseline and post-disassembly ELCID testing to assess stator core iron integrity, with all results indicating acceptable lamination condition. The existing opposing wedge system was then removed by the team.<\/p>\n<p>Our personnel removed series loop connections, circuit ring connections, and top and bottom bars. Core compression flange nuts underwent breakaway torque verification. Several nuts were found to be well below OEM specifications. Our team cleaned the mating surfaces and retorqued all nuts.\u00a0 Following core tightening, the belly bands were tightened with new shim packs installed.<\/p>\n<p>New 7FH2 bars were installed with proper alignment verification. Our technicians completed electrical testing, which included hi-pot tests at specified voltages, with all phases achieving resistance results within target ranges.<\/p>\n<p>Impressively, this all was completed within <strong>21 days<\/strong>. MD&amp;A has a consistent track record of handling rewinds of this complexity, including core and belly band tightening, within the same timeframe.<\/p>\n<table style=\"height: 428px;\" width=\"1231\">\n<tbody>\n<tr>\n<td width=\"312\">\n<p><figure id=\"attachment_77882\" aria-describedby=\"caption-attachment-77882\" style=\"width: 419px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" class=\"wp-image-77882 \" style=\"font-family: inherit; font-size: inherit;\" src=\"https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2026\/02\/Stator-Views-of-unit-with-final-paint-applied1-300x225.jpg\" alt=\"\" width=\"419\" height=\"314\" srcset=\"https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2026\/02\/Stator-Views-of-unit-with-final-paint-applied1-300x225.jpg 300w, https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2026\/02\/Stator-Views-of-unit-with-final-paint-applied1-1024x768.jpg 1024w, https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2026\/02\/Stator-Views-of-unit-with-final-paint-applied1-768x576.jpg 768w, https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2026\/02\/Stator-Views-of-unit-with-final-paint-applied1-1536x1152.jpg 1536w, https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2026\/02\/Stator-Views-of-unit-with-final-paint-applied1-2048x1536.jpg 2048w\" sizes=\"(max-width: 419px) 100vw, 419px\" \/><figcaption id=\"caption-attachment-77882\" class=\"wp-caption-text\">Stator View with final paint applied<\/figcaption><\/figure><\/td>\n<td width=\"312\">\n<p><figure id=\"attachment_77883\" aria-describedby=\"caption-attachment-77883\" style=\"width: 427px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" class=\"wp-image-77883 \" src=\"https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2026\/02\/Stator-Views-of-unit-with-final-paint-applied2-300x225.jpg\" alt=\"\" width=\"427\" height=\"320\" srcset=\"https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2026\/02\/Stator-Views-of-unit-with-final-paint-applied2-300x225.jpg 300w, https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2026\/02\/Stator-Views-of-unit-with-final-paint-applied2-1024x768.jpg 1024w, https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2026\/02\/Stator-Views-of-unit-with-final-paint-applied2-768x576.jpg 768w, https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2026\/02\/Stator-Views-of-unit-with-final-paint-applied2-1536x1152.jpg 1536w, https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2026\/02\/Stator-Views-of-unit-with-final-paint-applied2-2048x1536.jpg 2048w\" sizes=\"(max-width: 427px) 100vw, 427px\" \/><figcaption id=\"caption-attachment-77883\" class=\"wp-caption-text\">Stator View with final paint applied<\/figcaption><\/figure><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>Field Spare Rewind<\/strong><\/p>\n<p>Our team also conducted a <a href=\"https:\/\/www.mdaturbines.com\/repairs\/generator\/field-services\/\">field rewind<\/a> on the 7FH2 generator field. Our technicians disassembled the unit, which included removal of the bore copper and <a href=\"https:\/\/www.mdaturbines.com\/parts\/generator\/collector-rings\/\">collector rings<\/a>. The field forging underwent media blasting and comprehensive non-destructive examination (NDE), including magnetic particle testing on the field body and penetrant testing on wedges and retaining rings. All NDE results were satisfactory.<\/p>\n<p>During reassembly, our generator experts installed newly insulated bore copper, main lead studs, and coil components in a controlled, clean room environment. Each coil underwent individual electrical testing before installation and clamping. The field completed a successful bake cycle during which the coils were compressed to their specified diameter via bake clamps.<\/p>\n<figure id=\"attachment_77880\" aria-describedby=\"caption-attachment-77880\" style=\"width: 330px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" class=\"wp-image-77880\" src=\"https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2026\/02\/IMG_6151-225x300.jpg\" alt=\"All copper coils installed on generator field replacement\" width=\"330\" height=\"440\" srcset=\"https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2026\/02\/IMG_6151-225x300.jpg 225w, https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2026\/02\/IMG_6151-768x1024.jpg 768w, https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2026\/02\/IMG_6151-1152x1536.jpg 1152w, https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2026\/02\/IMG_6151-1536x2048.jpg 1536w, https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2026\/02\/IMG_6151.jpg 1800w\" sizes=\"(max-width: 330px) 100vw, 330px\" \/><figcaption id=\"caption-attachment-77880\" class=\"wp-caption-text\">All copper coils installed on generator field<\/figcaption><\/figure>\n<p>Throughout the rewind process, MD&amp;A\u2019s engineers performed thorough <a href=\"https:\/\/www.mdaturbines.com\/services\/generator\/generator-testing-inspections\/\">electrical testing.<\/a> These tests included: insulation resistance, polarization index, AC impedance, winding resistance, as well as repetitive surge oscillation (RSO), turn-to-turn testing, pole balance, and AC hi-pot. Once fully wound, the field was then high-speed balanced, which included a heat run before the unit was staked, painted, and wrapped for storage.<\/p>\n<p><strong>Reassembly and Alignment<\/strong><\/p>\n<p>The arrival of the refurbished generator field marked a pivotal moment in the outage. Our team constructed our <a href=\"https:\/\/www.mdaturbines.com\/resources\/generator-field-support-platform\/\">generator field support platform<\/a> to allow for easy install of the field. This system addresses the unique challenges associated with the 7FA\/7FH2 configuration: 1) the shaft centerline height is 13 feet above machine baseline (grade), and 2) the gas turbine inlet ducting and filter house limit crane access.<\/p>\n<figure id=\"attachment_77878\" aria-describedby=\"caption-attachment-77878\" style=\"width: 572px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" class=\"wp-image-77878\" src=\"https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2026\/02\/IMG_3725-300x225.jpg\" alt=\"Generator field replacement reassembly\" width=\"572\" height=\"429\" srcset=\"https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2026\/02\/IMG_3725-300x225.jpg 300w, https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2026\/02\/IMG_3725-1024x768.jpg 1024w, https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2026\/02\/IMG_3725-768x576.jpg 768w, https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2026\/02\/IMG_3725-1536x1152.jpg 1536w, https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2026\/02\/IMG_3725-2048x1536.jpg 2048w\" sizes=\"(max-width: 572px) 100vw, 572px\" \/><figcaption id=\"caption-attachment-77878\" class=\"wp-caption-text\">Generator reassembly<\/figcaption><\/figure>\n<p>During reassembly, MD&amp;A\u2019s technicians performed a 16-point turbine-to-generator alignment. The stator was repositioned to meet OEM specifications. The newly rewound replacement field was then carefully set into place, followed by the installation of lower half bearings with precise tilt and twist measurements recorded.<\/p>\n<p>All of the generator\u2019s systems were returned to service with proper clearances and operational parameters verified.<\/p>\n<p><strong>Conclusion<\/strong><\/p>\n<p>This multi-faceted scope, including a 7FH2 generator field replacement and full stator rewind, demonstrates the technical complexity and precision required for successful power generation equipment maintenance.<\/p>\n<p>The project required specialized expertise across multiple disciplines. Our ability to coordinate these complex activities with our expert knowledge of OEM specifications and decades of field-proven success exemplifies why power generation customers worldwide rely on MD&amp;A to keep their assets operating reliably.<\/p>\n<p>Call us at +1 (314) 880-3000 today or use our\u00a0<a href=\"https:\/\/www.mdaturbines.com\/contact\/\">contact form<\/a>.<\/p>\n<p><img decoding=\"async\" class=\"wp-image-77881 size-medium aligncenter\" src=\"https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2026\/02\/Picture1_220dpi-e1772116034749-225x300.jpg\" alt=\"\" width=\"225\" height=\"300\" srcset=\"https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2026\/02\/Picture1_220dpi-e1772116034749-225x300.jpg 225w, https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2026\/02\/Picture1_220dpi-e1772116034749-770x1024.jpg 770w, https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2026\/02\/Picture1_220dpi-e1772116034749-768x1022.jpg 768w, https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2026\/02\/Picture1_220dpi-e1772116034749.jpg 1152w\" sizes=\"(max-width: 225px) 100vw, 225px\" \/><\/p>\n","protected":false},"excerpt":{"rendered":"<p>MD&amp;A was contracted to perform a Generator Major inspection, to provide a GE\u00ae 7FH2 Generator Field Replacement and perform an onsite Stator Rewind. The scope&#8230;<\/p>\n","protected":false},"author":22,"featured_media":77880,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"content-type":"","footnotes":""},"categories":[208,210,3],"tags":[],"class_list":["post-77875","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-gas-turbine","category-generator","category-mda-insight"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>7FH2 Generator Field Replacement with Stator Rewind &#8211; MDA Turbines<\/title>\n<meta name=\"description\" content=\"Generator field replacement and onsite stator rewind for a GE\u00ae 7FH2 completed in 21 days, including inspection testing and high-speed balance\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.mdaturbines.com\/resources\/generator-field-replacement\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"7FH2 Generator Field Replacement with Stator Rewind &#8211; 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