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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?
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 2Vm.
- 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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