How many types of DC distributions system are present solely based on the way they are fed by feeders?a)3b)4c)5d)6Correct answer is option 'B'. Can you explain this answer?

Question

Answer

On the basis of how DC distributors are fed by the feeders, they are classified as:

Distributor fed at one end
Distributor fed at both ends
Distributor fed at the centre.
Ring distributor.

Now the type of distribution given in the question is of type “Distributor fed at one end”.

In this type of feeding, the distributor is connected to the supply at one end and loads are taken at different points along the length of the distributor.
In the above figure end P is also called singly fed distributor and loads I₁, I₂ and I₃ tapped off at points Q, R, S respectively.

Points to remember in this type of distribution:

The current in the various sections of the distributor away from the feeding point goes on decreasing. Thus the current in the section PQ is more than current in the section QR and the current in the section QR is more than current in section RS.
The voltage across the loads away from the feeding point goes on decreasing. Therefore minimum voltage occurs at point S.
In case a fault occurs at/on any section of the distributor, the whole distributor will have to be disconnected from the supply mains.

Answer

On the basis of how DC distributors are fed by the feeders, they are classified as:

Distributor fed at one end
Distributor fed at both ends
Distributor fed at the centre.
Ring distributor.

Now the type of distribution given in the question is of type “Distributor fed at one end”.

In this type of feeding, the distributor is connected to the supply at one end and loads are taken at different points along the length of the distributor.
In the above figure end P is also called singly fed distributor and loads I₁, I₂ and I₃ tapped off at points Q, R, S respectively.

Points to remember in this type of distribution:

The current in the various sections of the distributor away from the feeding point goes on decreasing. Thus the current in the section PQ is more than current in the section QR and the current in the section QR is more than current in section RS.
The voltage across the loads away from the feeding point goes on decreasing. Therefore minimum voltage occurs at point S.
In case a fault occurs at/on any section of the distributor, the whole distributor will have to be disconnected from the supply mains.

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