How is power factor responsible for transmission and distribution?

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Question ajoutée par shakeel khan , Site Engineer/MEP Electrical. , synergy infra Consultant private limited
Date de publication: 2016/08/02

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par RAGHU NANDAN , FRONTEND ENGINEER , CATHYOS LAB

In most LT distribution circuits normally the Power Factor ranges from 0.65 to 0.75. A low Power Factor contributes towards high distribution losses.
For a given load, if the Power Factor is low, the current drawn in high And the losses proportional to square of the current will be more. Thus, line losses owing to the poor PF can be reduced by improving the Power Factor. This can be done by application of shunt capacitors.
Shunt capacitors can be connected either in secondary side (11 KV side) of the 33/11 KV power transformers or at various point of Distribution Line.
The optimum rating of capacitor banks for a distribution system is 2/3rd of the average KVAR requirement of that distribution system.
The vantage point is at 2/3rd the length of the main distributor from the transformer.
A more appropriate manner of improving this PF of the distribution system and thereby reduce the line losses is to connect capacitors across the terminals of the consumers having inductive loads.
By connecting the capacitors across individual loads, the line loss is reduced from 4 to 9% depending upon the extent of PF improvement.