Radial Feeder In Power System

Protection of radial feeders.

Radial feeder in power system.

As a protection engineer analyze the protection system and suggest the appropriate type of relays that can be used along with circuit breakers in case of close in fault of a long feeder. In this system different feeders radiate from a substation or a generating station and feed the distributors at one end. Q 1 there is a radial feeder available in the system as shown in the below figure which are used to supply power continuously to a load. The loss of the utility source transformer or the service or distribution equipment will result in a loss of service.

Thus the main characteristic of a radial distribution system is that the power flow is in only one direction. This advantage however is offset by the difficulty of maintaining supply in the event of a fault occurring in the feeder. In electrical engineering a feeder line is a type of transmission line. But radial electrical power distribution system has one major drawback that in case of any feeder failure the associated consumers would not get any power as there was no alternative path to feed the transformer.

This requirement makes the protection of parallel feeders little bit more complex than simple non direction over current protection of line as in the case of radial feeders. It is used extensively to serve the light and medium density load areas where the primary and secondary circuits are usually carried overhead on poles. In telecommunications a feeder line branches from a main line or trunk line. Single line diagram of a typical radial distribution system is as shown in the figure below.

In case of transformer failure also the power supply is interrupted. In a power system a radial feed is one where a source is only present at one end of the transmission line. In other words the consumer in the radial electrical distribution system would be in darkness until the feeder. If the loss of a transformer or feeder can t result in the loss.

If a source of power is present at both ends it is said to be a networked line. The radial type of distribution system a simple form of which is shown in figure 2 is the most common. In a radial system when the number of feeders is connected. A feeder line is a peripheral route or branch in a network which connects smaller or more remote nodes with a route or branch carrying heavier traffic the term is applicable to any system based on a hierarchical network.

It has the drawback that continuity of supply cannot be controlled at the load end in the occurrence of a fault. From the generator or the supply end to the load end. If fault occurs in any of the feeders only that faulty feeder should be isolated from the system in order to maintain continuity of supply from source to load. The main characteristic of a radial system is that power flow only in one direction i e.