Bissoy.com
Doctors Medicines MCQs Q&A

Which portion of the transmission system is more prone to faults ?

Which portion of the transmission system is more prone to faults ? Correct Answer Overhead lines

The correct answer is 'option 3'

Solution:

The overhead lines are open to the atmosphere and also pass through different environments viz. forests while other equipments are kept in substations where appropriate protection can be provided.

Additional Information There are two types of faults:

Open Circuit Faults: 

The open-circuit fault happens due to the failure of one or two conductors. These faults take place in series with the line so referred to as a series fault. Such types of faults have a strong impact on the reliability of the system. The open-circuit fault is classified as:

  1. Open Conductor Fault
  2. Two conductors Open Fault
  3. Three conductors Open Fault

 

Short Circuit Faults:

The short-circuit fault is commonly divided into symmetrical and asymmetrical types. These faults are further categorized as one of five types. In order of frequency of occurrence, they are:

Asymmetrical Faults:

Asymmetrical faults mandate the calculation of positive negative and zero sequence components separately.

  • Single Line to Ground Fault: This type of fault occurs when you have one of the phases (A, B or C) is shorted with the ground.
  • Line to Line Fault: This type of fault occurs when you have one of the phases (A, B or C) is shorted with the ground.
  • Double Line to Ground Fault: This type of fault occurs when two phases are shorted with the ground together (A-B-G, B-C-G or C-A-G)

 

Symmetrical Faults: 

Symmetrical faults do not give rise to zero sequence or negative sequence components because they are perfectly balanced, symmetrical faults only have positive sequence values.

  • Three Phase Line to Ground Fault: The 3-phase to ground faults are faults in which all the phases (A, B, and C) are shorted together and are grounded.

  • Three Phase Line to Line Fault: The three-phase faults occur when you have A, B, and C phases are shorted together but the ground is not involved.

Related Questions

Choose the statement(s) where the underlined word is used correctly: (i) A prone is a dried plum. (ii) He was lying prone on the floor. (iii) People who eat a lot of fat are prone to heart disease.
Which of the following systems are more prone to faults?
Metals with wide stacking faults (low SFE) strain-harden more rapidly, twin easily on annealing, and shows a different temperature dependence of flow stress than metals with narrow stacking faults.
Which component of the power system is least prone to faults ?
If the transmission co-efficient T₁ of a transmission line is 1.333 and the characteristic impedance of the λ/4 transmission line used is 100Ω, then the characteristic impedance of the transmission line is:
If the first half of the English alphabet is reversed and then next portion of English alphabet is reversed so as 'A' takes the portion of 'M' and 'N' takes the portion of 'z' then which letter will be 6th to the left of 17th letter to the right of 7th leter from the left?
Statement 1: With respect to meat, the red portion contains a salt binder to cause tackiness at temperatures above 48 deg C. Statement 2: The white portion + red portion form an integral mass having interface between layers.
The carpogonium of lichen is a special cellular filament consisting of two portions, the lower coiled portion and the upper straight portion. The coiled portion constitutes the
Thrust faults belong to which variety of faults?
Read the following passage carefully and choose the most appropriate answer to the question out of the four alternatives.
To avoid the various foolish opinions to which mankind are prone, no superhuman brain is required. A few simple rules will keep you free, not fromall errors, but from silly errors. If the matter is one that can be settled by observation, make the observation yourself. Aristotle could haveavoided the mistake of thinking that women have fewer teeth than men, by the simple device of asking Mrs. Aristotle to keep her mouth openwhile he counted. Thinking that you know when in fact you do not is a bad mistake, to which we are all prone. I believe myself that hedgehogs eatblack beetles, because I have been told that they do; but if I were writing a book on the habits of hedgehogs, I should not commit myself until Ihad seen one enjoying this diet. Aristotle, however, was less cautious. Ancient and medieval writers knew all about unicorns and salamanders;not one of them thought it necessary to avoid dogmatic statements about them because he had never seen one of them.
The author portrays mankind as