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The capacity of pole mounted substation is limited up to
25 kVA
250 kVA
50 kVA
500 kVA
250 kVA
A pole-mounted substation is a distribution substation where the transformer and other equipment are mounted on one or more poles. Due to mechanical constraints related to the weight the poles can support and safety regulations for overhead installations, the capacity of such substations is standardly limited to 250 kVA.
A pole-mounted substation is a distribution substation where the transformer and other equipment are mounted on one or more poles. Due to mechanical constraints related to the weight the poles can support and safety regulations for overhead installations, the capacity of such substations is standardly limited to 250 kVA.
P=3тАЛVLтАЛILтАЛcos╧Х тАФ Represents the real power rating of the distribution transformer
WeightтИЭCapacitykVAтАЛ тАФ Mechanical load limit relationship
The pole-mounted structure must support the static load of the distribution transformer, the HV drop-out fuse cut-outs, lightning arresters, and LV switchgear. As the transformer rating increases, the weight increases significantly, exceeding the structural integrity of standard single or H-pole arrangements. Consequently, loads requiring more than 250 kVA necessitate ground-mounted or plinth-mounted substation designs for stability and ease of maintenance.
Primarily used for rural electrification and low-density residential distribution.
Installed on H-pole or single-pole structures.
Commonly steps down voltage from 11 kV/22 kV/33 kV to 415 V/240 V.
Equipped with DO fuse (Drop Out Fuse) and Lightning Arresters for protection.
Cost-effective for small loads
Requires minimal land area
Easy to install in remote areas
High risk of atmospheric disturbance
Limited capacity range
Difficult to perform major repairs at height
Rural agricultural pump sets
Small village power distribution
Temporary construction sites
Standard practice in India limits pole-mounted transformers to 250 kVA, with 100 kVA and 160 kVA being common intermediate sizes.
For loads exceeding 250 kVA, the industry shifts to plinth-mounted (ground) substations which can accommodate transformers up to several MVA.
B is correct тАФ 250 kVA is the standard upper limit for pole-mounted substation configurations due to mechanical load-bearing capacity and safety standards.
Always remember that 'Pole Mounted' implies weight constraints, while 'Plinth Mounted' is for high capacity. In exams, if the question asks about 500 kVA or above, it is almost always a ground/plinth-mounted setup.