Substation Power Distribution Systems Quiz
30 Questions
0 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the main purpose of an electrical distribution system?

To efficiently and safely deliver electricity to end-users while ensuring reliability and stability of the system.

What are the components of an electrical distribution system?

Power lines, transformers, circuit breakers, fuses, and meters.

Define an electrical distribution system.

A network of electrical components used to supply power to buildings, homes, and industries.

What is the role of transformers in an electrical distribution system?

<p>To step down high voltage electricity received from the power generation station to lower voltage levels for distribution.</p> Signup and view all the answers

What does the distribution system consist of?

<p>Feeders, distributors, and service mains.</p> Signup and view all the answers

Where does the distribution system receive high-voltage electricity from?

<p>Power generation stations.</p> Signup and view all the answers

What makes the underground system more expensive compared to the overhead system?

<p>The high cost of trenching, conduits, cables, manholes, and special equipment.</p> Signup and view all the answers

Which system, overhead or underground, is more flexible?

<p>Overhead system.</p> Signup and view all the answers

Why are faults in underground systems considered rare?

<p>Cables are laid underground and are generally provided with better insulation.</p> Signup and view all the answers

What contributes to the better appearance of underground systems?

<p>All distribution lines are invisible in underground systems.</p> Signup and view all the answers

What is a disadvantage of underground systems when it comes to fault location and repairs?

<p>Difficult to locate and repair faults.</p> Signup and view all the answers

How does the current carrying capacity and voltage drop compare between overhead and underground systems?

<p>Not provided.</p> Signup and view all the answers

What is a 2-wire DC system used for in distribution?

<p>For low power distribution of DC power</p> Signup and view all the answers

Explain the difference between the outgoing and return wires in a 2-wire DC system.

<p>One is the positive outgoing wire and the other is the negative return wire.</p> Signup and view all the answers

What is the main advantage of a 3-wire DC system over a 2-wire system?

<p>It provides two voltages at the consumer terminals: V between any outer and the neutral, and 2V between the outers.</p> Signup and view all the answers

Why are lamps and heating circuits connected between either outer and the neutral in a 3-wire DC system?

<p>Because they require less voltage compared to loads like motors, which are connected across the outers.</p> Signup and view all the answers

Name two methods of obtaining a 3-wire DC system.

<ol> <li>Two generator method. 2. 3-wire DC.</li> </ol> Signup and view all the answers

Why is the 2-wire DC system never used for transmission purposes?

<p>Due to its inefficiency for transmission purposes.</p> Signup and view all the answers

What are the two types of distribution systems based on the nature of current?

<p>D.C. Distribution System, A.C. Distribution System</p> Signup and view all the answers

Why is the overhead system more commonly used for distribution?

<p>It is 5 to 10 times cheaper than the equivalent underground system.</p> Signup and view all the answers

Name the three schemes of connection in a distribution system based on connection.

<p>(a) radial system, (b) ring main system, (c) interconnected system</p> Signup and view all the answers

What is the main advantage of using alternating current in distribution systems?

<p>Alternating voltage can be conveniently changed in magnitude by means of a transformer.</p> Signup and view all the answers

In what situations is the underground distribution system typically used?

<p>It is used where overhead construction is impracticable or prohibited by local laws.</p> Signup and view all the answers

Why is alternating current preferred over direct current in modern distribution systems?

<p>AC voltage can be easily transformed, allowing for efficient high-voltage transmission.</p> Signup and view all the answers

What are the limitations of the radial system connection scheme in a distribution system?

<p>Consumers are dependent on a single feeder and single distributor, leading to supply cut off in case of faults.</p> Signup and view all the answers

Describe the ring main system connection scheme in a distribution system.

<p>The primaries of distribution transformers form a loop that starts from the substation, makes a loop through the area to be served, and returns to the substation.</p> Signup and view all the answers

What advantage does the ring main system offer in terms of supply reliability?

<p>The system is very reliable as each distributor is fed via two feeders.</p> Signup and view all the answers

How does the ring main system prevent voltage fluctuations at consumer's terminals?

<p>By having less voltage fluctuations at consumer's terminals.</p> Signup and view all the answers

Explain how supply continuity is maintained in the ring main system in case of a fault.

<p>In the event of a fault on any section of the feeder, the supply continuity is maintained as each distributor is fed via two feeders.</p> Signup and view all the answers

Provide an example scenario where the ring main system ensures continuity of supply in case of a fault.

<p>If a fault occurs at any point F of section SLM of the feeder, the continuity of supply is maintained through the other feeder.</p> Signup and view all the answers

More Like This

Use Quizgecko on...
Browser
Browser