Hydro electric

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Hydro electric

  1. 1. PRESENTATION OUTLINE • Introduction to Nepal Electricity Authority • Electrical Power System in Nepal • Middle-Marsyangdi Hydroelectric Stations. • Operating Principles of Hydroelectric plants. • Hydro electric Power components 01/08/14 1
  2. 2. INTRODUCTION TO NEPAL ELECTRICITY AUTHORITY (NEA) • NEA is a government owned electricity provider. • It works on all the part of electrical system. GENERATION TRANSMISSION DISTRIBUTION CONSUMER PRICING 01/08/14 2
  3. 3. Electrical Power System in Nepal • GENERATION Voltage level: 11 KV, 3 Phase, AC, 50 Hz • TRANSMISSION (voltage stepped up) Voltage level: 110 and 220 KV, 3 Phase, HVAC, 50 Hz • DISTRIBUTION (Voltage stepped down) Voltage level: 11KV, 3 Phase, 50 Hz feeder line 220/380 Volts at consumer end 01/08/14 3
  4. 4. Middle-Marsyangdi Hydroelectric Stations Established: The plant was commissioned on 14 December 2008 Features: -One of the large power houses in Nepal. -70 MW generation capacity. Two units of 35 MW. System Voltage of 11 KV. -Connected to the National grid at the voltage level of 132 KV. -The average annual energy output amounts to 398 GWh (Power x annual operating hours) 01/08/14 4
  5. 5. Middle-Marsyangdi Hydroelectric Stations Middle-Marsyangdi hydro electric power station. 01/08/14 5
  6. 6. Middle-Marsyangdi organization Chart (Technical) 01/08/14 6
  7. 7. Operating Principles of Hydroelectric Stations A typical Hydropower Station 01/08/14 7
  8. 8. Operating Principles of Hydroelectric Stations 1. Water flowing through Marsyangdi river is dammed so that required water level is maintained to pass the water to the intake gates. Spillways are operated to prevent the flooding. 2. Water then passes through intake gates to trash rack which prevents large debris from entering into the tunnel. The trash racks are cleaned periodically using cranes. 01/08/14 8
  9. 9. Operating Principles of Hydroelectric Stations 3. Water then enters the desander where the sand present in water is removed by sedimentation. The collected sand is pumped back into the river through flushing channel.   4. Water almost free from sand then passes through tunnel to surge tank which prevents water hammering in penstock pipe and maintain constant flow through it. 01/08/14 9
  10. 10. Operating Principles of Hydroelectric Stations 5. Water then enters the penstock after passing through the valve chamber and in the penstock; the discharge of water is measured. 6. The penstock then bifurcates to supply water for each unit. Each bifurcation is provided with a bypass valve for balancing the pressure during maintenance. 01/08/14 10
  11. 11. Operating Principles of Hydroelectric Stations 7. Water then passes through the expansion pipe followed by main inlet valve (MIV) and enters the spiral casing. 8. Water is guided by the adjustable guide vanes which then impact the runner, thus rotating the turbine. 01/08/14 11
  12. 12. Operating Principles of Hydroelectric Stations 9. This rotates the turbine shaft which is coupled with the generator which generates electricity based on the principles of electromagnetism. 10. The current so generated is passed to the transformers which step up the voltage to provide supply to the national grid. 01/08/14 12
  13. 13. Hydropower components 1. Civil Structures like Dam, Opening etc 2. Some Mechanical Components like Turbine Governor, valves etc 3. Electrical Components like Power Generator Power Transformer Excitation System Switch gear and Protection System etc 01/08/14 13
  14. 14. Civil Structures A typical dam and opening in Hydroelectric stations at the Middle Marsyangdi MMHPS 01/08/14 14
  15. 15. Mechanical Equipments (only some are shown) 1. Francis Runner 01/08/14 2. Butterfly valve Opened 15
  16. 16. Mechanical Equipments (only some are shown) 3. Bypass valve 01/08/14 4. Guide Bearing 16
  17. 17. Electrical Equipments 1. Power Generator Generator Specifications at MMHPS : Type: 3-Phase, 2 unit, Synchronous : Power: 35 MW each unit. : Voltage level: 11 KV : Frequency: 50 Hz 01/08/14 17
  18. 18. Electrical Equipments 1. Generator Principles 01/08/14 1-Phase Faraday’s law of electromagnetic induction Three Phase Waveforms 18
  19. 19. Electrical Equipments Brushless Excitation System To provide the excitation field (magnetic fields) needed by synchronous generator. 01/08/14 11 KV/180 volt excitation system is used at MMHPS 19
  20. 20. Electrical Equipments Power Transformer (Step Up) Specification: : 11 KV Primary (generation voltage level) : 132 KV (Secondary national grid voltage level) : Delta/Star type : Power rating 42 MVA : Purpose: For national grid connection. 01/08/14 20
  21. 21. Electrical Equipments Station and local Transformers (Step down) Specification: : 132 KV Primary (National Grid level) : 33 KV (Secondary Station level) : Star/Delta type : Power rating 5 MVA : Purpose: Local Power Supply through Damauli-Udipur 33kv line 01/08/14 21
  22. 22. Thanks for your attention! 01/08/14 22
  23. 23. Questions! 01/08/14 23

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