Mhi transformer

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  • Yes I do have. I only do paid service
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  • Yes
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  • Tell me all that involves in transfomer repair workshop,machineries,human resources and finances required for one to start this kind of project
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  • No Now I am work in ESP Transformer Maintenance
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  • thanks alot marimuthu,
    the presentation is good.do u have any project on establishment of transformer repair workshop plant for distribution transformers
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Mhi transformer

  1. 1. PAGE 11 Typical Construction of Transformers Shell-type Shell-type LV Coil HV Coil Upper Tank Upper Wedge Core Clamping Frame Upper Filling Block Magnetic Shield e Cor Lower Filling Block Tongue Wedge & Magnetic Shield Lower Wedge Magnetic Shield Magnetic Shield Lower Tank Tongue Support MHI BUSINESS CONFIDENTIAL
  2. 2. PAGE 12 Typical Construction of Transformers Core-type Core-type Cover Core Support Core Upper End Frame Pressure Ring Tank LV Coil HV Coil Press Ring bolt Lower End Frame Voltage[kV] Criteria of Adoption 500 Core-Form Shell-Form 230 FDG,Step-down 120 Bank Capacity[MVA] Insulation Duct Frame Clamp Bolt MHI BUSINESS CONFIDENTIAL
  3. 3. PAGE 13 Typical Construction : Oil Filled Transformer Conservator Bushing Current Transformer Pressure Relief Device Oil Level Gauge Cooler Connecting Valve Cooling Fan Buchholz Relay Dehydrating Breather Tank Dial Thermometer Radiator Oil Pump MHI BUSINESS CONFIDENTIAL
  4. 4. PAGE 14 General Arrangement of Gen. Step-up TR Cooler Control Cabinet LV Bushing 2U 2V 2W 3φ21/380kV 444MVA On-Load TC (OLTC) 1N Core Grounding Bushing HVN Bushing 1U 1V 1W Conservator for Main Tank Cooler HV Bushing Conservator for OLTC OLTC Operating Mechanism Oil Pump MHI BUSINESS CONFIDENTIAL
  5. 5. PAGE 15 Internal Arrangement of Gen. Step-up TR 2U OLTC 2V 2W 3φ 21/380kV 444MVA 1N 1U 1V LV Bushing 1W HVN Bushing HV Bushing Coil BCT Core MHI BUSINESS CONFIDENTIAL
  6. 6. PAGE 16 General Arrangement of Power Plant Aux. TR Cooler Control Cabinet LVN Bushing 1U De-Energized TC (DTEC) 1V 1W 2N1 2U1 2V1 2W1 2N2 2U2 2V2 2W2 3φ 21/13.8kV-13.8kV 90MVA 3φ16.5/13.8kV-13.8kV 100MVA UNIT TR LV Bushing Core Grounding Bushing Conservator HV Bushing Manual Operating Handle of DTC Radiator Cooling Fan MHI BUSINESS CONFIDENTIAL
  7. 7. PAGE 17 Internal Arrangement of Power Plant Aux. TR LVN Bushing 2N1 2U1 2V1 2W1 2N2 2U2 3φ 21/13.8kV-13.8kV 90MVA 2V2 2W2 De-Energized TC(DETC) 1U 1V 1W LV Bushing HV Bushing Core Grounding Bushing Coil Core MHI BUSINESS CONFIDENTIAL
  8. 8. PAGE 18 General Arrangement of RO Plant Aux. TR Cooler Control Cabinet LVN Bushing 1U Manual Operating Handle of DETC 1V 1W 2N1 2U1 2V1 2W1 2N2 2U2 2V2 2W2 3φ 21/13.8-13.8kV 41MVA LV Bushing Core Grounding Bushing Conservator HV Bushing Cooling Fan Radiator MHI BUSINESS CONFIDENTIAL
  9. 9. PAGE 19 Internal Arrangement of RO Plant Aux. TR LVN Bushing De-Energized TC(DETC) 2N1 2U1 2V1 2W1 3φ 21/13.8-13.8kV 41MVA 2N2 2U2 2V2 Manual Operating Handle of DETC 2W2 1U 1V 1W LV Bushing HV Bushing BCT Coil Core MHI BUSINESS CONFIDENTIAL
  10. 10. PAGE 20 General Arrangement of Sea Water Intake Aux. TR Cooler Control Cabinet LVN Bushing 1U Manual Operating Handle of DETC 1V 1W 2N 2U 2V 2W 3φ 21/13.8kV 23MVA LV Bushing Core Grounding Bushing Conservator HV Bushing Radiator Cooling Fan MHI BUSINESS CONFIDENTIAL
  11. 11. PAGE 21 Internal Arrangement of Sea Water Intake Aux. TR De-Energized TC(DETC) LVN Bushing 2N 2U 2V 3φ 21/13.8kV 23MVA 2W Manual Operating Handle of DETC LV Bushing 1U 1V 1W HV Bushing Coil Core MHI BUSINESS CONFIDENTIAL
  12. 12. PAGE 22 General Arrangement of Gen. Excitation TR 2U 2V 2W LV Bushing 3φ 21/0.69kV 3160kVA 1U 1V 1W HV Bushing Conservator Radiator Terminal MHI BUSINESS CONFIDENTIAL
  13. 13. PAGE 23 Internal Arrangement of Gen. Excitation TR 2U 2V 2W 3φ 21/0.69kV 3160kVA 1U Core Grounding Busing 1V 1W HV Bushing LV Bushing Coil Core MHI BUSINESS CONFIDENTIAL
  14. 14. PAGE 24 Agenda ■ General Explanation of Power Transformers ■ General Explanation of Power Transformers ■ Construction of Transformers ■ Construction of Transformers ■ Oil preservation System ■ Oil preservation System ■ Tap Changer System OLTC // DETC ■ Tap Changer System OLTC DETC ■ Cooling System ■ Cooling System ■ Other Accessories ■ Other Accessories ■ Inspection & Maintenance ■ Inspection & Maintenance ● Routine Inspection & Maintenance ● Routine Inspection & Maintenance ● Outage Inspection & Maintenance ● Outage Inspection & Maintenance ● Troubleshooting ● Troubleshooting MHI BUSINESS CONFIDENTIAL
  15. 15. PAGE 25 Typical External Construction : Oil Filled Transformer Conservator Bushing Current Transformer Pressure Relief Device Oil Level Gauge Cooler Connecting Valve Cooling Fan Buchholz Relay Dehydrating Breather Tank Dial Thermometer Radiator Oil Pump MHI BUSINESS CONFIDENTIAL
  16. 16. PAGE 26 Oil Preservation System (Typical) : (Conservator) Conservator For Transformer Tank Conservator For Transformer Tank ◆ To prevent deterioration of oil from moisture & oxygen. ◆ To absorb expansion of oil volume due to change of oil temp. Air Release Valve Rubber Bag Dial-type Oil Gauge Breather Buchholz Relay Oil-sampling Valve Conservator For Conservator For OLTC OLTC OLTC Protective Relay Rubber Cell Type Conservator No-moisture No-oxidation MHI BUSINESS CONFIDENTIAL
  17. 17. PAGE 27 Filter Breather Silica-gel vent Connecting flange Silica-gel Glass window Dehydrating chamber Color・of Silica-gel Blue Good Brown Watch Brown No-good Pink Replace Damp Silica-gel With Dry Silica-gel Pink How To Re-use Damp Silica-gel + Oil pot Filter Set screw Level mark (red line) Damp Silica-gel PINK Silicon oil 150∼200℃ 10∼20Minutes MHI BUSINESS CONFIDENTIAL
  18. 18. PAGE 28 Oil level gauge (1/2) Insulated gear Stator magnet Pointer Bevel gear Micro switch Cam Gear Arm Pointer shaft Pointer Conservator Float Scale plate Gear Potentiometer Glass Case Rotor magnet MHI BUSINESS CONFIDENTIAL
  19. 19. PAGE 29 Oil level gauge (2/2) Rotor Magnet Dial Highest Oil Level Positions 10 Stator Magnet 9 Gears Connecting Rod Pointer N S N 90° Maximum Travel 8 7 6 5 4 S 3 Potentiometer 2 Lowest Oil Level Scale Plate Non-magnetic Sealed Box 1 0 Float MHI BUSINESS CONFIDENTIAL
  20. 20. PAGE 30 Buchholz Relay Red marked up point Float lock device detail Terminal Box Microswitch Gas Release Piping Separator Box Rotor Magnet Float Lock Device Stator Magnet Inspection Window Float (for light faultdetection of gas) Float (for heavy faultdetection of oil flow) MHI BUSINESS CONFIDENTIAL
  21. 21. PAGE 31 Buchholz Relay (alarm) Conservator Buchholz Relay S1 A/gas Float F1 Tank Bubbles Of Gas Overheat Partial Discharge MHI BUSINESS CONFIDENTIAL
  22. 22. PAGE 32 Buchholz Relay(trip) Conservator Buchholz Relay S2 Oil Flow Tank Arc Float F2 MHI BUSINESS CONFIDENTIAL
  23. 23. PAGE 33 Agenda ■ General Explanation of Power Transformers ■ General Explanation of Power Transformers ■ Construction of Transformers ■ Construction of Transformers ■ Oil preservation System ■ Oil preservation System ■ Tap Changer System OLTC // DETC ■ Tap Changer System OLTC DETC ■ Cooling System ■ Cooling System ■ Other Accessories ■ Other Accessories ■ Inspection & Maintenance ■ Inspection & Maintenance ● Routine Inspection & Maintenance ● Routine Inspection & Maintenance ● Outage Inspection & Maintenance ● Outage Inspection & Maintenance ● Troubleshooting ● Troubleshooting MHI BUSINESS CONFIDENTIAL
  24. 24. PAGE 34 OLTC Connection Diagram of HV Winding 【 Gen. Step-up TR 】 Voltage Table & Tap Connection. MHI BUSINESS CONFIDENTIAL
  25. 25. PAGE 35 Typical Tap Changer System (OLTC) Inclination at least a continuous 2% a - On-load tap-changer oil compartment f b - On-load tap-changer head c - Protective relay RS 2001 d - Stop valve e - Oil conservator f - Filter Breather g - Motor drive g MHI BUSINESS CONFIDENTIAL
  26. 26. PAGE 36 Current carrying contact Current carrying contact Even-NO side a,d : Main arcing contact b,c : Resistor contact 4 3 2 Diverter shaft (a) In service on odd-NO (b) Current carrying contact off. b contact on. Odd-NO side Insulation sector (c) a contact off. (d) c contact on (e) b contact off (f) d contact on (g) In service on even-NO MHI BUSINESS CONFIDENTIAL
  27. 27. PAGE 37 Tap Changer System (RⅢ-1200) – Typical For Gen. Step-up TR A C A・B B D Spring energy accumulator C・D Diverter SW E・F E F Fine tap selector Change-over selector MHI BUSINESS CONFIDENTIAL
  28. 28. PAGE 38 Tap Changer System (RS2001) Permanent magnet Test button IN SERVICE Test button OFF Flap valve Reed switch Cover open Position “IN SERVICE” Position “OFF” MHI BUSINESS CONFIDENTIAL
  29. 29. PAGE 39 Tap Changer System (Motor Drive Unit ED) - Typical Tap Change indication LOC-REM RAISE-LOWER Position indicator Operation counter MHI BUSINESS CONFIDENTIAL
  30. 30. PAGE 40 De-Energized Tap-Changer(Power Plant Aux. TR) Moving Contact Stationary Contact Insulating Drive Shaft Moving Contact Stationary Contact Insulating Frame MHI BUSINESS CONFIDENTIAL
  31. 31. PAGE 41 Manual handle for DETC (Power Plant Aux. TR ) Transfor- Gasket mer tank Worm heel Tap position dial Braking protrusion Gear case Manual handle Set bolt Output shaft Handle shaft Worm Peep window Stopper pin MHI BUSINESS CONFIDENTIAL
  32. 32. PAGE 42 Voltage Table & Tap Connection 【 RO Plant Aux. TR 】 【 Sea Water Intake Aux. TR 】 MHI BUSINESS CONFIDENTIAL
  33. 33. PAGE 43 Manual handle for DETC 【 Sea Water Intake Aux. TR 】 【 RO Plant Aux. TR 】 O-ring MHI BUSINESS CONFIDENTIAL
  34. 34. PAGE 44 Agenda ■ General Explanation of Power Transformers ■ General Explanation of Power Transformers ■ Construction of Transformers ■ Construction of Transformers ■ Oil preservation System ■ Oil preservation System ■ Tap Changer System OLTC // DETC ■ Tap Changer System OLTC DETC ■ Cooling System ■ Cooling System ■ Other Accessories ■ Other Accessories ■ Inspection & Maintenance ■ Inspection & Maintenance ● Routine Inspection & Maintenance ● Routine Inspection & Maintenance ● Outage Inspection & Maintenance ● Outage Inspection & Maintenance ● Troubleshooting ● Troubleshooting MHI BUSINESS CONFIDENTIAL
  35. 35. PAGE 45 Cooling System (Forced Oil Forced Air Cooling) Radiator Hot Oil Core Coil Cooling Fan Hot Air Cool Air Hot Air Cool Air Cooled Oil Oil Pump MHI BUSINESS CONFIDENTIAL
  36. 36. PAGE 46 Cooling System : Oil Filled Natural Cooling Hot Air Hot Oil Core Coil Cooled Oil Cool Air MHI BUSINESS CONFIDENTIAL
  37. 37. PAGE 47 Cooling System AEF-Type Cooler for ODAF AEF-Type Cooler for ODAF Discharge value Cooling fan box Cooler Element TR Air flow direction Cooling fan Fan guard Slit Fin - Cooling Pipes Structural Drawing pipes Fins Slits Terminal box Oil flow indicator Oil pump MHI BUSINESS CONFIDENTIAL
  38. 38. PAGE 48 Radiator Valve Handle MHI BUSINESS CONFIDENTIAL
  39. 39. PAGE 49 Cooling Fan (Outline) Mounting flame Mounting holes Blade Boss AIR FLOW Three phase Induction motor g in v ol tion ev ec R ir d Guard MHI BUSINESS CONFIDENTIAL
  40. 40. PAGE 50 Oil Pump Casing Terminal box Oling Stator Impeller Rotor Bearing Frame Shaft Bearing Name plate MHI BUSINESS CONFIDENTIAL
  41. 41. PAGE 51 Oil Flow Indicator Magnet Mounting holes(4-φ19holes, PCφ145) Pointer Scale plate Silicagelbox Vane Diaphragm STOP RUN Balancing spring Micro-switch Mounting frange Terminal-box G1/2 Screw MHI BUSINESS CONFIDENTIAL
  42. 42. PAGE 52 Cooler Control (Gen. Step-Up TR) Control SW “MANU” 43C “AUTO” Lamp WL GL1 GL2 RL1 RL2 Operation of Unit Coolers No. 1/3/5 Coolers are controlled by control SW 3-88CA. No. 2/4 Coolers are controlled by control SW 3-88CB. No. 1/3/5 Coolers are started when transformer is energized. No. 2/4 Coolers are started when winding temperature reached to 65 oC or oil temperature reached to 55 oC. Description Power Source No.1/3/5 Cooler OFF No.2/4 Cooler OFF No.1/3/5 Cooler ON No.2/4 Cooler ON POWER SOURCE 400V 60Hz 3-PHASE 3-WIRE 52CM 88CA 52C1 49F 11 FM 49F 13 FM PM No.1 COOLER 88CB 52C3 49P 1 FM 49F 31 49F 33 FM PM No.3 COOLER 52C5 49P 3 FM 49F 51 49F 53 FM PM No.5 COOLER 52C2 49P 5 FM 49F 21 49F 23 FM PM No.2 COOLER 52C4 49P 2 49F 41 FM 49F 43 FM 49P 4 PM No.4 COOLER MHI BUSINESS CONFIDENTIAL
  43. 43. PAGE 53 Cooler Control (Gen. Step-Up TR) Arrangement of Control Devices Arrangement of Control Devices Fault Indicators: Total 20 - Buchholz relay - Oil/Winding temp. - Pressure relief device - Cooler abnormal etc. Card Holder Display Panel Reset Button Normal Faulty Continual Faulty Cabinet Lighting MCCBs (Signal Lamp) Contactors WL GL1 RL1 GL2 RL2 Overload Relays (Control SW) 43C 3-88CA 3-88CB Heater SW Outlet Inner Panel Inner Panel Rear Wall Rear Wall Terminal Blocks for External Cables MHI BUSINESS CONFIDENTIAL
  44. 44. PAGE 54 Cooler Control (Power Plant Aux. TR) Control SW Operation of Cooling Fans “MANU” Cooling fans are controlled by control SW 3-88F. “AUTO” Cooling fans are started when winding temperature reached to 75 oC or oil temperature reached to 65 oC. 43F Lamp WL GL RL POWER SOURCE 400V 60Hz 3-PHASE 3-WIRE Description Power Source Cooling Fan OFF Cooling Fan ON 52M 52F 88F1 88F2 88F3 88F4 88F5 88F6 49F1 49F2 49F3 49F4 49F5 49F6 FM FM FM FM FM FM COOLING FAN MHI BUSINESS CONFIDENTIAL
  45. 45. PAGE 55 Cooler Control (Power Plant Aux. TR) Arrangement of Control Devices Arrangement of Control Devices Fault Indicators: Total 16 - Buchholz relay - Oil/Winding temp. - Pressure relief device - Cooler abnormal etc. Card Holder Display Panel Reset Button Normal Faulty Continual Faulty Cabinet Lighting MCCBs (Signal Lamp) WL GL RL Contactors with Overload Relays (Control SW) 43F 3-88F Heater SW Outlet Inner Panel Inner Panel Rear Wall Rear Wall Terminal Blocks for External Cables MHI BUSINESS CONFIDENTIAL
  46. 46. PAGE 56 Cooler Control (RO Plant Aux. TR) Control SW Operation of Cooling Fans “MANU” Cooling fans are controlled by control SW 3-88F. “AUTO” Cooling fans are started when winding temperature reached to 75 oC or oil temperature reached to 65 oC. 43F Lamp WL GL RL POWER SOURCE 400V 60Hz 3-PHASE 3-WIRE Description Power Source Cooling Fan OFF Cooling Fan ON 52M 52F 88F1 88F2 88F3 88F4 49F1 49F2 49F3 49F4 FM FM FM FM COOLING FAN MHI BUSINESS CONFIDENTIAL
  47. 47. PAGE 57 Cooler Control (RO Plant Aux. TR) Arrangement of Control Devices Arrangement of Control Devices Fault Indicators: Total 16 - Buchholz relay - Oil/Winding temp. - Pressure relief device - Cooler abnormal etc. Card Holder Display Panel Reset Button Normal Faulty Continual Faulty Cabinet Lighting MCCBs (Signal Lamp) WL GL RL Contactors with Overload Relays (Control SW) 43F 3-88F Heater SW Outlet Inner Panel Inner Panel Rear Wall Rear Wall Terminal Blocks for External Cables MHI BUSINESS CONFIDENTIAL
  48. 48. PAGE 58 Cooler Control (Sea Water Intake Aux. TR) Control SW Operation of Cooling Fans “MANU” Cooling fans are controlled by control SW 3-88F. “AUTO” Cooling fans are started when winding temperature reached to 75 oC or oil temperature reached to 65 oC. 43F Lamp WL GL RL Description Power Source Cooling Fan OFF Cooling Fan ON POWER SOURCE 400V 60Hz 3-PHASE 3-WIRE 52M 52F 88F 49F FM COOLING FAN MHI BUSINESS CONFIDENTIAL
  49. 49. PAGE 59 Cooler Control (Sea Water Intake Aux. TR) Arrangement of Control Devices Arrangement of Control Devices Fault Indicators: Total 16 - Buchholz relay - Oil/Winding temp. - Pressure relief device - Cooler abnormal etc. Card Holder Display Panel Reset Button Normal Faulty Continual Faulty Cabinet Lighting MCCBs (Signal Lamp) WL GL RL Contactors with Overload Relays (Control SW) 43F 3-88F Heater SW Outlet Inner Panel Inner Panel Rear Wall Rear Wall Terminal Blocks for External Cables MHI BUSINESS CONFIDENTIAL
  50. 50. PAGE 60 Agenda ■ General Explanation of Power Transformers ■ General Explanation of Power Transformers ■ Construction of Transformers ■ Construction of Transformers ■ Oil preservation System ■ Oil preservation System ■ Tap Changer System OLTC // DETC ■ Tap Changer System OLTC DETC ■ Cooling System ■ Cooling System ■ Other Accessories ■ Other Accessories ■ Inspection & Maintenance ■ Inspection & Maintenance ● Routine Inspection & Maintenance ● Routine Inspection & Maintenance ● Outage Inspection & Maintenance ● Outage Inspection & Maintenance ● Troubleshooting ● Troubleshooting MHI BUSINESS CONFIDENTIAL
  51. 51. PAGE 61 External Construction : Oil Filled Transformer Conservator Bushing Current Transformer Pressure Relief Device Oil Level Gauge Cooler Connecting Valve Cooling Fan Buchholz Relay Dehydrating Breather Tank Dial Thermometer Radiator Oil Pump MHI BUSINESS CONFIDENTIAL
  52. 52. PAGE 62 Bushing (1/2) Condenser Oil Filled Porcelain Test Tapping GIS side Transformer side HV of Gen. Step-up TR LV of Gen. Step-up TR MHI BUSINESS CONFIDENTIAL
  53. 53. PAGE 63 Bushing (2/2) Oil Filled Porcelain Porcelain Inner conductor Insulating oil HVN of Gen. Step-up TR MHI BUSINESS CONFIDENTIAL
  54. 54. PAGE 64 Bushing (2/2) Porcelain Oil Filled Porcelain Hanger terminal Porcelain Porcelain Generator Excitation TR Sea Water Intake Aux. TR LVN RO Plant Aux. TR LVN Generator Excitation TR HVL Generator Excitation TR LVN Inner conductor Insulating oil Insulated inner conductor HVL LVL Sea Water HVL Intake Aux. LVL TR RO Plant Aux. TR HVL LVN Generator Excitation TR LVL MHI BUSINESS CONFIDENTIAL
  55. 55. PAGE 65 External Construction : Oil Filled Transformer Conservator Bushing Current Transformer Pressure Relief Device Oil Level Gauge Cooler Connecting Valve Cooling Fan Buchholz Relay Dehydrating Breather Tank Dial Thermometer Radiator Oil Pump MHI BUSINESS CONFIDENTIAL
  56. 56. PAGE 66 Pressure Relief Device [Qualitrol Type] Detail B Detail A Function : Protection of Tank from Over-Pressure - Internal Fault - Mis - Handling MHI BUSINESS CONFIDENTIAL
  57. 57. PAGE 67 External Construction : Oil Filled Transformer Conservator Bushing Current Transformer Pressure Relief Device Oil Level Gauge Cooler Connecting Valve Cooling Fan Buchholz Relay Dehydrating Breather Tank Dial Thermometer Radiator Oil Pump MHI BUSINESS CONFIDENTIAL
  58. 58. PAGE 68 Winding Temp. Indicator Current Transformer 11 12 13 10 14 15 0 0 Winding Temp. = Oil temp. + △T Insulating Oil Contact No. 1 Fan Start (Gen. Desali . TR) Heating Coil Sensitive Element 2 Pump Start (Gen. Tr) 3 Alarm Tank 4 Trip MHI BUSINESS CONFIDENTIAL
  59. 59. PAGE 69 Oil and Winding Temp. Indicator 【OIL TEMP. INDICATOR 】 【WINDING TEMP. INDICATOR】 Wire to BCT Gasket Oil level Temperature pointer (3cc/MTO) Gasket Sensor port Sensor Oil level (110cc/MTH) Heater Max.temperature pointer Capillary tube Set shaft of max.temperature pointer HEATER Set temperature adjust screw Terminal name plate Container of desiccant Cabtyre cable BCT MHI BUSINESS CONFIDENTIAL
  60. 60. PAGE 70 Resistance Element Pt 100Ω (For Remote Winding Temp. Indicator) Terminal Box Fixing Nut Pt 100Ω Heater Gasket Bulb (Resistance / Heater) Well (No Oil) MHI BUSINESS CONFIDENTIAL
  61. 61. PAGE 71 Contact Setting Values of Protective devices Winding Temp. Indicator C/ Control Alarm Trip C/control Oil Temp. Alarm Indicator Trip #1 Alarm Buchholz Relay #2 Trip Pressure TR Tank Relief Device OLTC Oil Level TR Tank Gauge OLTC Oil Flow Low flow Indicator Oil flow OLTC speed Protective Device Gen. Power Plant RO Plant Sea Water Gen. Step-up TR Aux. TR Aux. TR Aux.TR Excitation TR #1 65 ℃ #1 75 ℃ #1 75 ℃ #1 75 ℃ #2 115 ℃ #2 115 ℃ #1 115 ℃ #2 115 ℃ #1 115 ℃ #3 120 ℃ #3 120 ℃ #2 120 ℃ #3 120 ℃ #2 120 ℃ #1 55 ℃ #1 65 ℃ #1 65 ℃ #1 65 ℃ #2 90 ℃ #1 90 ℃ #3 100 ℃ #2 100 ℃ 450cc gas accumulation 50cm/sec. ( Oil velocity) 100cm/sec. 12PSI 12PSI 12PSI 12PSI 12PSI 20PSI Low Low 600L/min 3.0m/s - - - - MHI BUSINESS CONFIDENTIAL
  62. 62. PAGE 72 Agenda ■ General Explanation of Power Transformers ■ General Explanation of Power Transformers ■ Construction of Transformers ■ Construction of Transformers ■ Oil preservation System ■ Oil preservation System ■ Tap Changer System OLTC // DETC ■ Tap Changer System OLTC DETC ■ Cooling System ■ Cooling System ■ Other Accessories ■ Other Accessories ■ Inspection & Maintenance ■ Inspection & Maintenance ● Routine Inspection & Maintenance ● Routine Inspection & Maintenance ● Outage Inspection & Maintenance ● Outage Inspection & Maintenance ● Troubleshooting ● Troubleshooting MHI BUSINESS CONFIDENTIAL
  63. 63. PAGE 73 Daily Patrol Appearance check: Check, visually, the exterior of transformer whether any abnormality exists or not. Noise and vibration: Listen operation sound of transformer and cooler (oil pump & fan). In case that any abnormal sound was found out, investigate the location and vibration. MHI BUSINESS CONFIDENTIAL
  64. 64. PAGE 74 Routine Maintenance Check List (1/3) Major Check Item Description (Check Method) 1.Cleanliness Dust on radiator (Visual) Rust on radiator (Visual) 2.Unusual Fans, pumps & oil noise pipes, etc. and vibration (Visual, audible & touching) 3.Temperature Winding & Oil temperature (Read & record and compare with previous data.) Check Action to be Taken at outage Reference (If beyond acceptable limit) No serious Clean by water or air accumulation No rust Repaint Not abnormal Tighten loose bolts. Replace bearings of noisy fan. Abnormally high or low considering load current & ambient temp. Check cooling system is functioning in normal. Check temperature indicator itself. Check heater of WTI MHI BUSINESS CONFIDENTIAL
  65. 65. PAGE 75 Routine Maintenance Check List (2/3) Description 4. Oil leaks 5. Oil level 6. Silica-gel breather Check Major Check Item Reference (Check Method) Oil filled compartments No leakage and joints(Visual) Oil level gauge Oil level-oil (Read & record) temp. curve (See page-96) Action to be Taken at outage (If beyond acceptable limit) Exchange gasket. Adjust oil level (If necessary) Check actual oil level by vinyl hose. Check oil level gauge & rubber cell. Check seal of OLTC chamber. Adjust oil level. (if necessary) Color of silicagel. Blue silicagel, If two thirds of total become Breathing action clean & clear pink, exchange with new one in oil pot (Visual) oil,breathing or dry them. action is Exchange silicon oil. normal. Clean filter in oil pot. MHI BUSINESS CONFIDENTIAL
  66. 66. PAGE 76 Routine Maintenance Check List (3/3) Description 7. Buchholz relay 8. OLTC 9. OLTC operation mechanism Major Check Item (Check Method) Gas accumulation in relay (Visual) Oil level (Read & record) Check Reference No gas accumulation Tap position (Read and record) Tap change indication -Read, record and compare with previous data. If operation time is extremely many or few, Investigate reason such as actual voltage variation, sensitive range of voltage relay. -Pointer must be within center zone Action to be Taken at outage (If beyond acceptable limit) Analyze gas. Analyze dissolved gas in oil, and investigate the reasons. Oil level-oil Check the seal of OLTC temp. curve chamber. (See Page-96) Adjust oil level to normal. (if necessary) Silicagel breather: Same as to item-6 above. (Visual) MHI BUSINESS CONFIDENTIAL
  67. 67. PAGE 77 Agenda ■ General Explanation of Power Transformers ■ General Explanation of Power Transformers ■ Construction of Transformers ■ Construction of Transformers ■ Oil preservation System ■ Oil preservation System ■ Tap Changer System OLTC // DETC ■ Tap Changer System OLTC DETC ■ Cooling System ■ Cooling System ■ Other Accessories ■ Other Accessories ■ Inspection & Maintenance ■ Inspection & Maintenance ● Routine Inspection & Maintenance ● Routine Inspection & Maintenance ● Outage Inspection & Maintenance ● Outage Inspection & Maintenance ● Troubleshooting ● Troubleshooting MHI BUSINESS CONFIDENTIAL
  68. 68. PAGE 78 Outage Maintenance Check List (1/8) Description (Maintenance Freq.) Major Check Item Check Method 1. Breather silica Moisture contamination Gel (Every 6 months) Visual Dielectric strength 2. Insulating oil (Once a year) Oil tester (Sphare electrode) IEC pub.60156 or equivalent Moisture content Karl-Fischer Method ASTM-D1533 Check Reference Action to be Taken (if beyond acceptable limit) Normal silica gel color is blue. Pink color signifies it has moisture Replace the silica gel if more than two third of it has turned into pink Main tank : More than 40kV OLTC tank : More than 30kV Perform oil filtration Main tank : Less than 30ppm OLTC tank : Less than 40ppm Perform oil filtration MHI BUSINESS CONFIDENTIAL
  69. 69. PAGE 79 Outage Maintenance Check List (2/8) Description (Maintenance Freq.) Major Check Item Check Method Power factor (Tan d) & resistivity IEC pub.60247 or equivalent 2. Insulating oil (Once a year) Acidity Check Reference Action to be Taken (if beyond acceptable limit) Tan d: Less than 0.5% Resistivity: More than 1E13 Perform oil filtering & degassing. If it can not be improved, exchange with new oil is preferable. Acidity: <0.2mg/KOH/g Acidity: 0.2 ~ 0.4mg/KOG/g: Filter or replace oil at IEC Pub.60296 or equivalent earliest opportunity Acidity: More than 0.4mg/KOH/g: Filter immediately Dissolved gas analysis Refer to page- 97 & 98 Analyze by taking oil sample Perform internal inspection IEC pub 60567 or equivalent MHI BUSINESS CONFIDENTIAL
  70. 70. PAGE 80 Outage Maintenance Check List (3/8) Description (Maintenance Freq.) Major Check Item Check Method Insulation resistance 3. Fan and Oil Pump motors (Once every 2 years) 4. Control panel, terminal box and cables (Once a year) Measure with 500V Megger Casing temperature Check Reference Action to be Taken (if beyond acceptable limit) Fan motor : > 1 MΩ Pump motor : > 2 MΩ Dry out interior of the fan motors Fan motor : Amb. Temp. +40℃ Oil Pump : Oil Temp. +10℃ Measure by thermometer - Check motor insulation resistance - Check motor current of each phase to ensure there is no imbalance Water tightness - No seepage of water Visual - Replace worn out rubber gaskets MHI BUSINESS CONFIDENTIAL
  71. 71. PAGE 81 Outage Maintenance Check List (4/8) Description (Maintenance Freq.) 4. Control panel, terminal box and cables (Once a year) 5. Protective relays (Once every 2 years) Major Check Item Check Method Tightness of terminal connections Visual and touch Switch, lamp and alarm function Check with schematics Connection cables IR Check Reference Action to be Taken (if beyond acceptable limit) - Not loosened - Retighten - No malfunction - Replace faulty parts - Minimum 2 Meg Ohm - No abrasion or crack Measure with 500V - Dry out and retest megger - Replace damaged cable Visual Insulation resistance - Minimum 2 Meg Ohm Measure with 500V - Dry out any dew on megger terminals - No sign of overheating Connections Clean and retighten Visual connections the MHI BUSINESS CONFIDENTIAL
  72. 72. PAGE 82 Outage Maintenance Check List (5/8) Description Major Check Item (Maintenance Check Method Freq.) 5. Protective Operational tests relays (Once every Operation 2 years) Insulation resistance 6. Windings (Use a 2000V Megger) Measure between : (Once every 2 -HV and ground years) -LV and ground -HV and ground 7. Conservator Rubber bag (When oil level is abnormal ) Visual 8. Radiator Dust, rust and paint (Once every 6 months) Visual Check Reference Action to be Taken (if beyond acceptable limit) Smooth operation and contact closing Investigate cause and rectify Refer to Page-95 Determine the cause of low IR value Clean transformer bushing if necessary No damage Replace No accumulation of dust. No peeling of paint or rust Clean by washing. Repaint MHI BUSINESS CONFIDENTIAL
  73. 73. PAGE 83 Outage Maintenance Check List (6/8) Description Major Check Item (Maintenance Check Method Freq.) 9. OLTC Protective relay Check Reference Action to be Taken (if beyond acceptable limit) Contacts operate Test push button Repair/replace Water-proof of housing No water in housing Visual Replace door gasket Function of space heater (Once a year) Functioning 10. Motor Drive Supply power Unit Condition of equipment (Once a year) Visual Step-by-step operation Keeping Switch-ON Remedy or replace No abnormality Remedy or replace Stop operation after one tap changing Investigate and remedy MHI BUSINESS CONFIDENTIAL
  74. 74. PAGE 84 Outage Maintenance Check List (6/8) Description (Maintenance Freq.) Major Check Item Check Method Check Reference Action to be Taken (if beyond acceptable limit) No operation End position switch toward 10. Motor Drive Switch-ON Investigate and remedy passage direction Unit Protective device against Protective device operate passage of position (Once a year) Turn by hand crank toward Investigate and remedy passage MHI BUSINESS CONFIDENTIAL
  75. 75. PAGE 85 Outage Maintenance Check List (7/8) Lift-up Inspection of OLTC Diverter Switch (DIV-SW) Important: - Lift-up inspection of OLTC diverter switch must be done under supervising of Qualified and MR trained personnel or MR Technical Service. - Permissible exposing time of DIV-SW in atmosphere is less than 8 hours. Description Major Check & Reference Maintenance Item OLTC 1) Cleaning of DIV-SW, 1) Inspection Frequency: Type SW compartment, 80,000 operation times or 7 years R III 1200Y conservator (whichever comes earlier) 2) Changing of SW oil (Generator 3) Checking of DIV-SW, 2) DIV-SW has to be replaced if operation Step-up SW compartment, times exceed 800,000. Transformer) conservator 4) Measurement of 3) Tap Selector is generally maintenance contact wear free, however, contact with MR Technical 5) Measuring of Service if number of operation exceed transition resistance 800,000 times. 6) Checking protective relay, shaft, drive unit, etc. MHI BUSINESS CONFIDENTIAL
  76. 76. PAGE 86 Outage Maintenance Check List (8/8) Lift-up Inspection of OLTC Diverter Switch (DIV-SW) Description OLTC Type R 1200 Major Reference Check/Maintenance Item -The same items as to 1) Inspection Frequency: III above60,000 operation times or 7 years (whichever earlier) ( Generator Transformer ) 2) DIV-SW has to be replaced if operation times exceed 800,000. 3) Tap Selector is generally maintenance free, however, contact with MR Technical Service if number of operation exceed 800,000 times. MHI BUSINESS CONFIDENTIAL
  77. 77. PAGE 87 Guideline for Parts Replacement(1/2) (Expected Life of Parts) Expected Life *Bearings of oil pump Approx. 10 years *Bearings of fan motor Approx. 3-5 years *Protective relays Approx. 10 years Gaskets Approx. 10 years *Rubber bag Approx. 15 years Paint Approx. 5 years *OLTC diverter SW Material & Parts Remarks When abnormal noise would be found out. When abnormal noise would be found out. When abnormal function would be found out. When oil leakage would be found out. When damage of rubber bag would be found out. Paint on radiator is very important. (thin steel plate) Depending on results of periodical inspection.(contact wear, resister, insulation material, etc.) Note for asterisk marks (*) Before replacing the parts with asterisk mark, please also prepare the sealing gaskets for reassembly. MHI BUSINESS CONFIDENTIAL
  78. 78. PAGE 88 Guideline for Parts Replacement(2/2) (Expected Life of Parts) Material & Parts Motor drive ED - Door gasket - Other electrical parts Cooler control panel - Door gasket - Other electrical parts (Except lamps) Expected Life Approx. 10 years Approx. 10 years Approx. 10 years When deterioration of gasket would be found out. When abnormal function would be found out. When deterioration of gasket would be found out. Approx. 10 years When abnormal function would be found out. Remarks MHI BUSINESS CONFIDENTIAL
  79. 79. PAGE 89 Agenda ■ General Explanation of Power Transformers ■ General Explanation of Power Transformers ■ Construction of Transformers ■ Construction of Transformers ■ Oil preservation System ■ Oil preservation System ■ Tap Changer System OLTC // DETC ■ Tap Changer System OLTC DETC ■ Cooling System ■ Cooling System ■ Other Accessories ■ Other Accessories ■ Inspection & Maintenance ■ Inspection & Maintenance ● Routine Inspection & Maintenance ● Routine Inspection & Maintenance ● Outage Inspection & Maintenance ● Outage Inspection & Maintenance ● Troubleshooting ● Troubleshooting MHI BUSINESS CONFIDENTIAL
  80. 80. PAGE 90 Trouble shooting(1/2) Fault Possible Cause Oil and/or winding Overloading temp. Inefficient cooler units: (High) - Dust & foreign material on radiator - Faulty operation of fan & pump Faulty operation of defective thermometer Remedial Action Reduce load - Arrange to clean coolers - Remedy or replace them If thermometer indication is incorrect: - Check/adjust oil level in sensor pocket - Replace with new thermometer (if necessary) Open the valves Reduced oil flow Radiator valves shut off (Not reach to “RUN” position) Oil pump tripped or stopped Service the motor Power supply of oil pump motor Correct phase rotation (Reversed rotation) MHI BUSINESS CONFIDENTIAL
  81. 81. PAGE 91 Trouble shooting(2/2) Fault Possible Cause Oil level Shortage or excess of oil Oil leakage (High or Low) Damaged rubber bag in the conservator Seal between OLTC and transformer broken Buchholz relay Gas formation (minor trouble in (stage I operates) transformer) because of local heating or electric discharge Buchholz relay Sudden pressure rise in tank (stage II operates) because of internal fault Pressure release High tank pressure as a result device operates of internal fault OLTC protective relay Fault in the diverter insert Fault in the whole OLTC Malfunction of OLTC relay Remedial Action Adjust oil level Locate and repair leak Replace rubber bag Replace seal - Perform dissolved gas analysis - Perform internal inspection if necessary Shut down and investigate the cause Shut down and investigate the cause Lift up inspection of DIV SW. Internal inspection of Tr. Remedy or replace with new relay MHI BUSINESS CONFIDENTIAL
  82. 82. PAGE 92 APPENDIX MHI BUSINESS CONFIDENTIAL

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