(i) HVAC transmission: Advantages of HVAC transmission are as follows:
As the voltage is increased, the current carried by the conductors decreases. The i2R
losses correspondingly get reduced. However the cost of transmission towers,
transformers, switches and circuit breakers rapidly increases with increase in voltage,
in the upper ranges of a.c. transmission voltages.
(ii) HVDC transmission:
Advantages They (HVDC lines) are economical for bulk power transmission. The
voltage regulation problem is much less in DC since only IR drop is involved. There
is easy reversibality and controllability of power flow through a DC link. Also there is
considerable insulation economy.
Limitations: The systems are costly since installation of complicated converters and
DC switchgear is expensive. The converters require considerable reactive power.
Lack of HVDC circuit breakers hampers network operation. Moreover there is
nothing like DC transformer; voltage transformation has to be provided on the a.c.
sides of the system.
gregorymasila answered the question on February 20, 2018 at 16:09
-
List the advantages of nuclear power plants over conventional thermal power plants.
(Solved)
List the advantages of nuclear power plants over conventional thermal power plants.
Date posted:
February 20, 2018
.
Answers (1)
-
What is the fundamental difference between thermal and nuclear power plants?
(Solved)
What is the fundamental difference between thermal and nuclear power plants?
Date posted:
February 20, 2018
.
Answers (1)
-
What are different welding controls used in resistance welding?
(Solved)
What are different welding controls used in resistance welding?
Date posted:
February 20, 2018
.
Answers (1)
-
With the aid of sketches explain the operation of a four stroke engine
(Solved)
With the aid of sketches explain the operation of a four stroke engine.
Date posted:
February 16, 2018
.
Answers (1)
-
Name 3 drawing instruments commonly used in technical drawing and define the use of each tool
(Solved)
Name 3 drawing instruments commonly used in technical drawing and define the use of each tool
Date posted:
January 26, 2018
.
Answers (1)
-
Highlight different methods of water treatment.
(Solved)
Highlight different methods of water treatment.
Date posted:
January 15, 2018
.
Answers (1)
-
Name any five factors which determine choice of roof structure
(Solved)
Name any five factors which determine choice of roof structure.
Date posted:
January 1, 2018
.
Answers (1)
-
Give five functional requirements of foundations
(Solved)
Give five functional requirements of foundations.
Date posted:
January 1, 2018
.
Answers (1)
-
Explain how to test for silt content in sand.
(Solved)
Explain how to test for silt content in sand.
Date posted:
January 1, 2018
.
Answers (1)
-
List five causes of unsealing of traps
(Solved)
List five causes of unsealing of traps.
Date posted:
January 1, 2018
.
Answers (1)
-
State 5 principles of a good drainage system.
(Solved)
State 5 principles of a good drainage system.
Date posted:
January 1, 2018
.
Answers (1)
-
What is critical Mach number in high speed flight?
(Solved)
What is critical Mach number in high speed flight?
Date posted:
December 29, 2017
.
Answers (1)
-
Give reasons as to why a star delta starter is preferred with induction motor
(Solved)
Give reasons as to why a star delta starter is preferred with induction motor
Date posted:
November 6, 2017
.
Answers (1)
-
State four advantages of using aluminum tubes over steel when making scaffolds.
(Solved)
State four advantages of using aluminum tubes over steel when making scaffolds.
Date posted:
October 11, 2017
.
Answers (1)
-
Explain briefly two reasons why blinding is necessary.
(Solved)
Explain briefly two reasons why blinding is necessary.
Date posted:
October 11, 2017
.
Answers (1)
-
Give four methods of transporting wet concrete to the required position.
(Solved)
Give four methods of transporting wet concrete to the required position.
Date posted:
October 11, 2017
.
Answers (1)
-
List four factors that influence the cost of building work.
(Solved)
List four factors that influence the cost of building work.
Date posted:
October 11, 2017
.
Answers (1)
-
Explain four factors that may improve reputation of a contractor.
(Solved)
Explain four factors that may improve reputation of a contractor.
Date posted:
October 11, 2017
.
Answers (1)
-
Give two reasons for providing hoarding on a construction site.
(Solved)
Give two reasons for providing hoarding on a construction site.
Date posted:
October 11, 2017
.
Answers (1)
-
List four factors to consider when selecting type of a roof structure.
(Solved)
List four factors to consider when selecting type of a roof structure.
Date posted:
October 11, 2017
.
Answers (1)