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Which of the following conditions is favourable for the application of radial distribution network?
Power is generated at high voltage and substation is located very far away from the load centre
Power is generated at high voltage and substation is located at the load centre
Power is generated at low voltage and substation is located at the load centre
Power is generated at low voltage and substation is located very far away from load centre
Power is generated at low voltage and substation is located at the load centre
A radial distribution network is the simplest and most economical configuration where power flows in one direction from a single substation to the loads. It is most suitable for low-voltage distribution where the substation is located centrally relative to the load points to minimize line losses and voltage drop.
IS 10118: Part 1 (Code of practice for selection, installation and maintenance of switchgear and controlgear)
A radial distribution network is the simplest and most economical configuration where power flows in one direction from a single substation to the loads. It is most suitable for low-voltage distribution where the substation is located centrally relative to the load points to minimize line losses and voltage drop.
VdropтАЛ=I├ЧRcos╧Х+I├ЧXsin╧Х тАФ Formula for voltage drop in a distribution feeder
PlossтАЛ=3I2R тАФ Power loss in a three-phase distribution line
The principle relies on a single feeder originating from a substation, branching out into distributors, and finally to service mains. Since there is no parallel path for power flow, the voltage drop increases significantly with the distance from the substation. Therefore, the system is efficient only when the source is centrally placed among the load consumers.
Radial systems are non-redundant and rely on a single source of supply.
Reliability is lower because a fault on the main feeder results in a complete outage for all downstream consumers.
Cost-effective for rural and light-density urban areas.
Voltage regulation is poor at the end of the line compared to the start.
Simple design and operation
Lowest capital investment cost
Ease of protection coordination
Poor reliability (single point of failure)
Higher voltage fluctuations at end terminals
Less flexibility for load growth
Rural electrification
Secondary distribution in small residential areas
Radial networks are typically utilized for lower voltage levels (e.g., 415V/230V).
Option A and B are incorrect because generating power at high voltage for a distribution network is unnecessary and economically inviable for local load centers.
Option D is impractical as low voltage over long distances causes prohibitive voltage drops.
C is correct тАФ A radial distribution network is most efficient when the substation is placed centrally to manage voltage drop and losses at lower distribution voltages.
In competitive exams, remember that 'Radial' systems are for low cost/low reliability, while 'Ring Main' systems are used when high reliability is required.
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