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PREVENTIVE MAINTAINANCE AND CONDITION MONITORING FOR POWER TRANSFORMERS

SEMINAR ON. PREVENTIVE MAINTAINANCE AND CONDITION MONITORING FOR POWER TRANSFORMERS. PRESENTED BY - M/s VISHVAS POWER ENGINEERING SERVICES PVT. LTD. NAGPUR. INFORMATION ABOUT COMPANY.

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PREVENTIVE MAINTAINANCE AND CONDITION MONITORING FOR POWER TRANSFORMERS

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  1. SEMINAR ON PREVENTIVE MAINTAINANCE AND CONDITION MONITORING FOR POWER TRANSFORMERS PRESENTED BY - M/s VISHVAS POWER ENGINEERING SERVICES PVT. LTD. NAGPUR

  2. INFORMATION ABOUT COMPANY • NAMES OF DIRECTORS :Mr. R. M. Bhave : Mr.S.V.D’mello :Mr.Kiran Joharapurkar • PRODUCT SKILLS OF DIRECTORS :HT switchgrars : Transformers (all make) :On load tap changers (all type) • No. of engineers/site managers:10 • Office staff:04 • Other staff/skilled workers:80

  3. INFORMATION ABOUT COMPANY AREAS OF BUSINESS INTEREST • Capital overhaul/servicing of power transformers • Servicing of SF6 breakers • Servicing of on load tap changers. • Annual maintenance contracts for substation and control room maintenance. • Testing of oil and bushings. • RLA studies on power transformers. • Testing of oil and bushings. • Installation services for power transformers, HT switchgears and substation equipments • Retrofitting of LT air circuit breakers • Installion of rubber balloons in conservator of power transformers to retard oxidation of oil • Testing and commising of substations • Testing of transformers

  4. Doubts raised by users • Whether oil filteration or dry out • Criterions of stopping dryout/filteration • Whether overhauling/reinsulation • Frequency of condition monitoring • Oil mixing ---------- preconditions • Dissolved Gas Analyis

  5. PLEASE LET ME KNOW WHAT YOU EXPECT FROM THIS SESSION?

  6. OIL PAPER Wood (treated / parmali WINDING TANK LEADS OLTC BUSHING COOLING BANKS/ HEAT EXCHANGER AUXILIARIES Areas of concern

  7. IMPORTANT STANDARDS TRANSFORMER USER SHOULD KNOW • IS 335 • IS 12463 • IS 1866 • IS 2099 • IS 2026

  8. TRANSFORMER FOR OVERHAULING

  9. PROCESS OF OVERHAULING TESTING POST SHUT DOWN OBSERVATIONS P.t.o

  10. POST SHUT DOWN OBSERVATIONS(CONT..) OIL DRAINING DISMANTLING

  11. 125 MVA TOP COVER LIFTING

  12. GASKET REPLACEMENT INTERNAL INSPECTION PREPARING TRS FOR EVACUATION N2 PRESSURE TEST

  13. VIEW OF LEAD TAKE OFF

  14. IEEE GUIDELINES INTERNAL Inspection Winding - Lead clamping Winding support system Clamping Insulation discoloration Lead distortion Lead movement Indications of hot spots

  15. IEEE GUIDELINES INTERNAL Inspection • Loose connections - Tap leads Bushings Terminal Boards Spacers Core bolt nuts. • Physical status- Contacts Operating mechanism Coupling shafts Shielding

  16. IEEE guidelines for Internal Inspection • Oil- Odour Color Moisture Free Water • Discoloration- Tank walls Bushing Terminals Corona shields Copper connectors Bus bars

  17. Vacuumdrying Vacuum drying is based on the principle of Thermodynamics Boiling point of moisture in insulation isreduced by way of PressureReductionPrinciple Thermal energy needs to be impartedexternally for achieving faster and better moisture extraction

  18. DRY OUT PROCESS INVOLVING CYCLES

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