Which type of transmission system is NOT considered for a DC system?a)DC two wires with midpoint earthedb)DC three wiresc)DC two wiresd)DC four wires with line earthedCorrect answer is option 'D'. Can you explain this answer? - EduRev Electrical Engineering (EE) Question

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Which type of transmission system is NOT considered for a DC system?

a)
DC two wires with midpoint earthed
b)
DC three wires
c)
DC two wires
d)
DC four wires with line earthed

Correct answer is option 'D'. Can you explain this answer?

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Most Upvoted Answer

Which type of transmission system is NOT considered for a DC system?a)...

The DC transmission systems are classified as:

DC two-wire

DC two-wire with mid-point earthed

DC three-wire

(i) DC two-wire:

In the 2-wire DC the system, one is the outgoing wire called positive wire and the other is the return wire called negative wire as shown in Figure below.
The return wire is also connected to earthing.

(ii) DC two-wire with mid-point earthed:

The two-wire DC system with mid-point earthed is shown in the figure below.
The maximum voltage between any conductor and earth is Vm and the maximum voltage between conductors is 2V_m.
It increases the voltage level in comparison to two-wire systems.

(iii) DC three-wire:

In a 3-wire DC system, there are two outers and a middle wire which is connected to earth.

When the load is balanced, the current in the neutral wire is zero.

DC 3- wire system is shown in figure below:

Conclusion:

From the above concept, it is clear that the DC four wires with line earthed are not considered for DC transmission.

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Community Answer

Which type of transmission system is NOT considered for a DC system?a)...

DC Transmission Systems

DC Four Wires with Line Earthed

DC four wires with line earthed is not considered for a DC system. In a DC transmission system, the most commonly used configurations are DC two wires with midpoint earthed, DC three wires, and DC two wires. However, a DC four wires system with line earthed is not typically employed for DC transmission.

Explanation

- DC two wires with midpoint earthed: This configuration involves two conductors with a midpoint earth connection. It is commonly used for long-distance DC transmission as it helps in reducing losses and improving system reliability.
- DC three wires: In this setup, three conductors are used for DC transmission. It allows for better load balancing and fault tolerance compared to a two-wire system.
- DC two wires: A simple two-wire DC system is used for shorter transmission distances or in applications where a more complex configuration is not necessary.
- DC four wires with line earthed: This configuration involves four conductors with one of the lines being earthed. While it is possible to have a four-wire DC system, it is not commonly used and considered less practical compared to other configurations.

In summary, DC four wires with line earthed is not typically considered for a DC transmission system due to its limited advantages and practicality compared to other configurations.

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Which type of transmission system is NOT considered for a DC system?a)DC two wires with midpoint earthedb)DC three wiresc)DC two wiresd)DC four wires with line earthedCorrect answer is option 'D'. Can you explain this answer?

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