EHVAC And DC Assignment

VISION INSTITUTE OF TECHNOLOGY

   Assignment#1

  1. Explain the following terms used in EHVAC transmission systems with suitable diagrams (i) sub-transient reactance, (ii) transient reactance, (iii) synchronous reactance of a source, (iv) a.c. and d.c. components and (v) the interrupting current capacity of a circuit breaker.
  2. Explain clearly how overvoltages are generated when interrupting (i) low.
  3. inductive current and (ii) low capacitive current. Draw a figure showing ferroresonance condition in a network when two poles of a circuit breaker are open,  and one pole is closed. Also, explain the methods of reduction of switching surges on EHV systems.
  4. Explain the functions and role of smoothing rectors in HVDC link operations with mathematical justification.
  5. Explain the potential applications and types of Multiterminal DC systems.
  6. Derive the relation for the maximum surface gradient for the bundled conductor.
  7. having two conductors.

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