Q.1: The following data refer to a single-phase transformer: Turn ratio (1:5), R1=0.24 n, X=1 N, R2=6 N, X2=25 N. The no-load current = 10A leading the flux () by 25°. The primary current is 100A and the input voltage is 230V and power input factor 0.9 leading. Determine by aid of a vector diagram, (i) the load voltage and current, (ii) the load power factor, (iii) the efficiency.

Q: A long line with A = D = 0.9 1.5° and B = 150 65° has at the load end a transformer having series…

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Q: A single pahse transformer has 700 primary and 2100 secondary turns. The primary is connected to 400…

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Distribution System

The final stage in the delivery of the electric power is the electric power distribution system. From the transmission system to the individual customers it carries electricity. The distribution system is connected with the transmission system and is used to lower the voltage of the transmission to medium voltage in the range of 2 kV to 35 kV with the help of transformers. This medium voltage to the distribution transformers located near the customer's premises is carried by the primary distribution system lines. These distribution transformers in turn lower the voltage to utilization voltage used in lightings, household appliances, industrial equipments etc. Through secondary distribution lines often several customers are supplied from one transformer. It is through service drops, the commercial and residential customers are connected to the secondary distribution system lines. Customers who demand a larger amount of power can be connected directly to the primary distribution system level or the sub-transmission level.