Experience

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  Generator Power Services

  • CEO

    • Aug 2008 - Present

    TG Types:Specialist have rich experience in the Design/ Manufacturing /Erection/Commissioning of 100/210/250/350/500/660/800 MW Turbo- Generators of Siemens & Russian Design (Type- THDF/ THW/ THRI/ TARI)Experience Details:General Generator Problems: Investigation of Electrical Faults/Analysis of Generators/ Motor Faults & Recommendations for Corrective & Preventive Measures RLA /Health Assessment/Life Extension Studies of Generators Supervision/ Analysis of Dielectric Diagnostic Tests Technical Lectures at Site to Operating & Maintenance Engineers on Latest Preventive maintenance Techniques of Turbogenerators Inspection / Special Checks & Tests to be done during Overhauls Complete Over haul & Winding Bar Replacement of Turbogenerator Erection & Commissioning Problems(A) Stator & Stator Winding(a) Investigation of Stator Earth Faults & Winding (Local) Repairs (b) Investigation of Stator Core Faults/ Melting & Repairs(c) Core loss, Core flux & Elcid Test on Stator Core & Analysis of Results(d) Investigation & Repairs of Water / Gas Leakage from Winding(e) Investigation of High Temperature of stator/ rotor Winding & Repair(f) Winding Bar Replacement / Complete Rewinding of TG(g) Stator Slot Wedging/ Ripple Springs Installation(h) Terminal Bushing/ Gaskets Replacements(i) Mechanical /Electrical/ Dielectric Tests/Analysis & Recommendation(j) Detection of Winding Blockages / Temperature Rise & Repair (Water Cooled TG)(k) Investigation of Corona Discharges in the Stator Overhang Winding & Application of Anti - Corona Varnish(B) Rotor & Rotor Winding(a) Investigation of Rotor Earth Faults & Repairs(b) Retaining Rings/ Current Carrying Bolts / Fan Hubs/ Slip Rings Replacements(c) Rotor Purge Test, RSO & Impedance Test for Rotor Pole Balance(d) Mechanical / Electrical/ Dielectric Tests on Windings and Analysis Recommendations for Corrective & Preventive Measures(e) Replacement of Rotor Compressor Fan blades

  • CEO

    • Jul 2008 - Present

    (C) Shaft Seals & Bearings Problems:(a) Investigation of Bearings/ Shaft Seals damages / Oil Starvation/ Analysis / Recommendation / Repairs(b) Shaft Seals/ Bearings / End Sheild Assembly Problems(D) Brushless Exciters (210/250/500/660 MW TG)(a) Replacement of / Current Carrying Bolts / Sealing Washers etc.(b) Fault location in Diode Wheels / Armature(E) Operational Problems(a) Problem of falling of H2 Gas Purity in TG Casing(b) Problem of High Temperature of Stator/Rotor Winding / Core / Gas(c) Problem of Very Low IR & PI of Stator / Rotor Winding & Dry out(d) Electrical Trippings / Faults on Generators & Analysis(e) Performance & Guarantee Tests Guidance & SupervisionMajor Achievements• Indigenously designed & developed for the first time Stator Core of the first 210 MW Turbo Generator Type - THRI 108/39 (Fully Impregnated) This TG has been supplied by BHEL & is in operation at no. of sites• Many short time site Assignments/ Rewinding of TG stator & rotor completed before scheduled time to the full satisfaction of customers• Appreciation received from many customers for the outstanding work done at site which resulted into reduction of down time of TG set• Many innovative Improvement projects were initiated and completed and most of them have also been awarded by BHEL Management. These are regarding rennovations / modernizations/ retro-fittings as well as time cycle/ wastage reduction

  • CEO

    • Jun 2008 - Present

    Some Major Acheivements after Retirement----------------------------------------------------------------Following Sites Visited on Customers Request / Problems attended(a) 210 MW TG Kolaghat Unit-1 – Rennovation / Major Overhaul (Sept 08) Reg.Rennovations / Latest Preventive Measures & Major Overhaul of Turbogenerator:Rennovation along with Major Overhaul of TG with Latest Measures was done under my Guidance as Site Incharge. Terminal Bushing Gaskets Replaced. All the LatestPeventive Measures were implemented(b) 210 MW TG Gandhi Nagar (GEB) Unit-3- Lower Bar failed/ Rewound (Nov 08) Reg.Investigation of Stator Winding Earth Fault & Replacement of 2 Nos. Lower Bars:TG tripped on Stator Earth Fault. Earth Fault analysed & detected in Lower bar. 2 Nos.Lower Bars Replaced & Complete rewinding done under my Guidance observing all the International Quality / Test Norms. Earth Fault Investigated & detected due to Piercing of a Broken Piece of Core Lamination.(c) Delivered Technical Lectures to GEB Engineers (Dec 08)Delivered Lectures on TG Operation & Maintenance / Inspection / RLA Studies / Latest Preventive Measures on Turbogenerators(d) 180 MW GTG (GPEC) Unit - 11 Gujarat – GTG imported from Siemens (May 09) Reg.Investigation of Cracks in Winding Overhang Supports / Brackets & Repairs:Visited site on Customer request to investigate the problem of cracks in winding overhang brackets. The repair of cracks in Bracket welding joints was done under my Guidance. Problem Investigated & Customer advised to get the Natural Frequency Test done on Winding Overhang. Suitable Guidelines also Provided to Prevent Recurrence of the Problem

  • CEO

    • Jun 2008 - Present

    (e) 210 MW TG – (Type-THW) OPGCL - IB Valley - damaged Core Repaired (June 09) Reg.Investigation of Core Damage / Looseness & Breaking of Stampings / Core Repair:Visited the site on Customer request & Analysed / Investigated the Problem of Looseness & Breaking of Stator Core Stampings. Core Repaired & Suitable Corrective & Preventive Measures advised to Prevent Recurrence of the Problem(f) 250 MW TG - (Type-THRI) Khaperkhera – MSEB – Falling of H2 gas Purity (July 09) RegInvestigation of Falling of Hydrogen Gas Purity in TG Casing & Prevention:Visited the site & Analysed / Investigated the Paranial Problem of Falling of Hydrogen Gas Purity inside Generator Casing. Detailed Guidelines advised to Prevent recurrenceof the problem in future(g) 500 MW TG – (Type-THDF) Trombay Unit – 5 (Dec 2010) TG is Imported from SiemensWater Leakage Observed from Winding bar in Hydraulic Test During Overhaul:Leakage was attended Insitu without removal of the Winding bar using State of the Art Technology. After Repair, Hydraulic Test of the Stator Winding was done Successfully(h) 210 MW -THW TG Kolaghat (WBPDCL) Unit- 5 – RLA Studies (January 2010) Reg.TG Life Extension Studies & Implementation of Preventive / Corrective Measures:Visited the site & Various RLA Tests performed under my Guidance. Test Results Analysed & Recommendations furnished / advised(i) 210 MW TG – (Type-THW) Korba (NTPC) Unit- 2 - RLA Studies (July 2010) Reg.RLA / Life Extension Studies & Tests on TG & Preventive / Corrective Measures:Visited the site on Customer / ABB request & Various RLA Tests performed under my Guidance. Test Results Analysed / Investigated & Preventive / Corrective Measuresadvised

  • CEO

    • Jun 2008 - Present

    (j) 235 MW TG (Imported from Russia-Ukrain) RAPP – NPC - Kota Unit -6 (Aug 2010) RegInsitu Repair of Stator Earth Fault in Lower Winding Bar No. 15 (Just at Slot Exit):Visited the site on Customer/ NPC request. The Earth Fault Spot was at Slot Exit & only 40 mm away from Stator Core. The Earth Fault Point was Repaired Insitu with utmost Care without Removal of Winding Bars & Successfully Tested at 28 KV AC High Voltage. This Insitu repair appreciably reduced TG Repair Cost & Huge Generation Loss due to Reduction of Down time of the TG set. Strong appreciation letter received from NPC Customer(k) 100 MW TG Badarpur (NTPC) Unit – 2 (October 2010)Melting of Flexibles Between Generator Bus Ducts & Terminal Bushings:Various Tests done to detect the Fault & the fault analysed. Flexibles Replaced & Machine Synchronised successfully & loaded to full Load.(l) RLA Studies & Current Condition Assessment of 500 MW Korba (NTPC) Unit - 5 Generator (May 2011)As per NTPC tender requirements, it was obligatory for the RLA Bidder to engage a Senior Expert from Generator Design Department from OEM (BHEL- OEM for 500 MW). PTA Hyderabad was awarded the RLA contract with my involvement as OEM – expert for the entire period of RLA activities. The Generator was thoroughly inspected &during the inspection, many Core packets detected loose, some stampings & ventilation spacers detected broken. Also 2 Nos. top winding bars were detected having deep cuts marks & damaged (just at slot exit). All the defects were rectified as per BHEL Quality practices under my guidance

  • CEO

    • Jun 2008 - Present

    (m) RLA Studies & Current Condition Assessment & Preventive / Corrective Measures:210 MW TG – (Type-THW) Korba (NTPC) Unit- 1 (Jan 2012) RegThe Generator was thoroughly inspected as Generator Expert (BHEL- OEM for 210 MW). During the inspection, many Core packets detected loose, winding overhang putty found loose. During Hydraulic test of stator winding, leakage detected from lower bar. All the defects attended as per BHEL Quality practices/ standards Various RLA Tests performed and test Results Analysed / Investigated & Preventive / Corrective Measures advised(n) RLA Studies & Current Condition Assessment & Preventive / Corrective Measures:210 MW TG – (Type-THW) Korba (NTPC) Unit- 3 ( Sept 2012) RegThe Generator was thoroughly inspected as Generator Expert (BHEL- OEM for 210 MW). During the inspection, some Core packets detected loose, Winding overhang putty at slot exit found cracked. During Pneumatic test of rotor winding leakage detected from inner Current Carrying bolts. All the defects attended as per BHEL Quality practices/ standardsVarious RLA Tests performed and test Results Analysed / Investigated & Preventive / Corrective Measures advisedEtc. Etc. There are many more such ……………………………………………..

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  Bharat Heavy Electricals Limited

  • Hardwar, Uttarakhand, India

  • Additional General Manager

    • Jun 1973 - Jul 2008
    • Hardwar, Uttarakhand, India

    100/210/250/350/500/660 MW Turbo-Generators of Siemens & Russian (USSR) Design(Type-THDF/ THW/ THRI/ TARI) with experience in the Design/ Manufacturing/ Erection/ Commissioning / Overhauls & Trouble shooting of Site/ Post Commissioning Problems(a) Processing of 100/200/210 ( H2 & Wate...