Which of the following is NOT a type of DC distributor?a)Distributor fed at one endb)Distributor fed at both endsc)Distributor fed at the centerd)Distributor fed at the horizonCorrect answer is option 'D'. Can you explain this answer?

Question

Answer

Explanation:

Distributor Types:
- Distributor fed at one end: This type of distributor is fed at only one end, with the other end being left open or terminated with a load.
- Distributor fed at both ends: In this type, the distributor is fed power at both ends, allowing for power to be distributed in both directions from the center.
- Distributor fed at the center: This type of distributor is fed power at the center, allowing for equal distribution of power in both directions.
- Distributor fed at the horizon: This option is NOT a type of DC distributor. It seems to be a combination of the previous options and does not represent a standard configuration in DC distribution systems.

Answer

Types Of DC Distributors:

DC distributors are usually classified on the basis of the way they are fed by the feeders. Following are the four types of DC distributors.
- Distributor fed at one end
- Distributor fed at both ends
- Distributor fed at the center
- Ring distributor

Distributor Fed At One End:

In this type, the distributor is connected to the supply at one end and loads are tapped at different points along its length.
The following figure shows the single-line diagram of a distributor fed at one end. It is worth noting that -

The current in various sections of the distributor away from the feeding point goes on decreasing.
From the above figure, the current in section DE is less than the current in section CD and likewise.
The voltage also goes on to decrease away from the feeding point. In the above figure, the voltage at point E will be minimum.
In case of a fault in any section of the distributor, the whole distributor will have to be disconnected from the supply. Thus, the continuity of supply is interrupted.

Distributor Fed At Both Ends:

In this type, the distributor is connected to supply at both ends, and voltages at feeding points may or may not be equal.
The minimum voltage occurs at some load point which is shifted with the variation of load on different sections of the distributor.

If a fault occurs at any feeding point, continuity of the supply is ensured from the other feeding point.
If a fault occurs on any section of the distributor, continuity of the supply is ensured on both sides of the fault with respective feeding points.
The conductor cross-section area required for a doubly fed distributor is much less than that required for a distributor fed at one end.

Distributor Fed At The Center:

As the name implies, the distributor is supplied at the center point.
Voltage drop at the farthest ends is not as large as that would be in a distributor fed at one end.

Ring Main DC Distributor:

In this type, the distributor is in the form of a closed ring and fed at one point.
This is equivalent to a straight distributor fed at both ends with equal voltages.

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