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The ring main distribution system is preferred over radial distribution system because _________.
it has fewer voltage fluctuation at consumers side
it always possesses unity power factor
there is no Ohmic loss
there is no requirement of distribution transformer
it has fewer voltage fluctuation at consumers side
The ring main distribution system is preferred because it provides power to the consumers from two different paths, which significantly minimizes voltage fluctuations and improves service reliability. In this configuration, the feeder forms a loop, allowing current to flow from both ends of the distributor.
IS 12360:1988
The ring main distribution system is preferred because it provides power to the consumers from two different paths, which significantly minimizes voltage fluctuations and improves service reliability. In this configuration, the feeder forms a loop, allowing current to flow from both ends of the distributor.
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Voltage┬аRegulation=VFLтАЛVNLтАЛтИТVFLтАЛтАЛ├Ч100%
In a ring main system, the distributor is supplied at one or more points and forms a closed loop. Since each load point is fed from two directions, the voltage drop along the line is significantly reduced compared to a radial feeder where the entire load is supplied from a single source. This redundancy ensures that the voltage regulation at the consumer end is much more stable.
Multiple feed paths reduce voltage drop
High reliability due to standby supply availability
Fault location is more complex compared to radial systems
Lower conductor material cost for a given voltage drop requirement
Improved voltage regulation
Higher service continuity/reliability
Maintenance can be performed without interrupting supply to all consumers
Complex protection scheme required
Higher initial design and installation cost
Fault localization is more time-consuming
Urban area power distribution
Industrial complexes requiring high reliability
High-load density areas
| Feature | Ring Main | Radial |
|---|---|---|
Voltage Regulation | Superior (reduced drop) | Inferior (higher drop) |
Reliability | High | Low |
Option B is incorrect because power factor depends on the consumer load characteristics, not the distribution topology.
Option C is incorrect because Ohmic loss I2R still occurs in a ring main; it is simply better distributed.
Option D is incorrect because distribution transformers are essential in both systems to step down voltage for end-users.
A is correct тАФ The ring main system offers multiple supply paths, which drastically reduces voltage fluctuations at the consumer terminals compared to a single-feed radial system.
For competitive exams, remember that Ring Main systems prioritize reliability and voltage stability, while Radial systems prioritize simplicity and low initial capital cost.
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