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Separate Sub-station is provided for load exceeds
6 kW
50 kW
80 kW
100 kW
100 kW
According to the Indian Electricity (IE) rules and standard utility practices for electrical distribution, a dedicated or separate sub-station is mandated when the total connected load of a consumer or premises exceeds 100 kW. This ensures grid stability and safety by isolating large industrial or commercial loads from standard low-tension residential distribution networks.
According to the Indian Electricity (IE) rules and standard utility practices for electrical distribution, a dedicated or separate sub-station is mandated when the total connected load of a consumer or premises exceeds 100 kW. This ensures grid stability and safety by isolating large industrial or commercial loads from standard low-tension residential distribution networks.
PloadтАЛ>100┬аkWтЯ╣Dedicated┬аSubstation┬аRequired тАФ The condition for mandatory separate substation installation.
I=3тАЛтЛЕVLтАЛтЛЕcos╧ХPтАЛ тАФ Relationship defining current demand based on load and power factor.
When a load exceeds 100 kW, the current demand is sufficiently high that supplying it via standard low-voltage distribution transformers would cause excessive voltage drops and thermal stress on the distribution feeder. Providing a separate substation (typically stepping down from 11 kV or 33 kV directly to 415 V) allows for independent metering, protection relaying, and power factor compensation at the point of entry, which protects the utility grid from localized disturbances.
Threshold limit is strictly set at 100 kW by most State Electricity Boards (SEBs) in India.
This rule prevents voltage instability for smaller consumers connected to the same distribution transformer.
The consumer must provide space and infrastructure for the transformer as per utility guidelines.
Improved voltage regulation for the consumer.
Independent protection and metering.
Reduced technical losses on the main distribution feeder.
High capital expenditure for the consumer.
Requirement for specialized maintenance and space allocation.
Large residential complexes.
Industrial manufacturing units.
Commercial shopping malls.
Voltage levels at the sub-station input are commonly 11 kV or 33 kV.
Some utility providers may lower this limit to 50 kW in specific industrial areas depending on local regulations, but 100 kW is the accepted standard benchmark for most exams.
D is correct тАФ A separate sub-station is mandatory for any installation where the total connected load exceeds 100 kW to ensure stability and reliable power distribution.
Always remember that for residential connections, the limit is 100 kW, but specialized industrial zones might have distinct regulatory requirements defined by the local Discom.