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INTRODUCTION OF HIGH VOLTAGE

INTRODUCTION OF HIGH VOLTAGE 

INTRODUCTION

The increasing need of transmitting greater and greater power day by day. Over a long distance has led continuous increase in transmission voltages. 

  • High voltage = up to 300kv 
  • Extra high voltage = 300-760kv
  •  Ultra high voltage = above 760kv 

 Necessity (Advantages) of EHV Transmission

  1. Increase in transmission efficiency , reduction in conductor material and reduction in losses. 
  2. construction of S/S for huge power transmission is more economical.
  3. There generating stations are located in remote area due to it’s requirements. Therefore EHV
    transmission is essential for transmission of huge blocks of power over long distances from there
    power plants. 
  4. This is flexible or future system growth. 
  5. Without E.H.V. transmission practically it is not possible to interconnect more than one system. 
  6. Transmission capacity increases as power transferred is
      7.Right of way reduction.
      8.Increase in surge impedance loading.

Disadvantages of EHV Transmission 

  1. Corona loss increases.
  2. Insulation requirement increases.
  3. Stability decreases.
  4. Heavy supporting structure.
  5. Mechanical vibration and oscillations increases.
  6. Audible noise increases.
  7. Interference increases.
  8. More chances of Ferranti effect.
  9. Surge impedance loading is higher.
  10. Compensation required 1) series (capacitors)     2) shunt (reactors)

Advantages of HVDC Transmission

  1. Cheaper cost. 
  2. No skin effect. 
  3. Voltage regulation. 
  4. Line loading. 
  5. Surge impedance loading. 
  6. Lesser dielectric loss. 
  7. Negligible sheath loss. 
  8. Corona loss. 
  9. Relative power compensation. 
  10. No stability limit. 

Disadvantages of HVDC Transmission 

  1. Costly terminal equipment. 
  2. More maintenance of line insulators. 
  3. Voltage transformation.

Comparison between EHV AC & HVDC system


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