DIFFERENT TYPES POWER DISTRIBUTION SYSTEM

THERE ARE MAINLY TWO TYPES OF POWER DISTRIBUTION SYSTEM

1.Radial Electrical Power Distribution System.

2.Ring Main Electrical Power Distribution System.

ANIMATED VIDEO FOR VARIOUS DISTRIBUTION SYSTEMS

1.Radial Electrical Power Distribution System.

Radial Electrical Power Distribution System

• In early days of electrical power distribution system, different feeders were radially come out from the substation and connected to the primary of distribution transformer directly.

• 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. 
•  In case of transformer failure also, the power supply is interrupted. In other words the consumer in the radial electrical distribution system would be in darkness until the feeder or transformer was rectified.(Ref.http://www.electrical4u.com/electrical-power-distribution-system-radial-ring-main-electrical-power-distribution-system/)

2.Ring Main Electrical Power Distribution System.

• The drawback of radial electrical power distribution system can be overcome by introducing a ring main electrical power distribution system. 
• Here one ring network of distributors is fed by more than one feeder. In this case if one feeder is under fault or maintenance, the ring distributor is still energized by other feeders connected to it. In this way the supply to the consumers is not affected even when any feeder becomes out of service. 
• In addition to that the ring main system is also provided with different section isolates at different suitable points.
•  If any fault occurs on any section, of the ring, this section can easily be isolated by opening the associated section isolators on both sides of the faulty zone.

CIRCUIT DIAGRAM OF RING MAINS SYSTEM

In this way, supply to the consumers connected to the healthy zone of the ring, can easily be maintained even when one section of the ring is under shutdown.
You can get futher details by watching this video lecture on Distrubution Systems by D.P. KOTHARI