- Efficiency is maximum at a load factor at which iron losses are equal to copper losses
- Efficiency changes with load factor
- The average load factor of a typical power transformer used in distribution system is about 0.5 and those used in generating station and major sub station is 0.8
- For maximum efficiency with 50% load factor, copper losses should be 4 times the iron losses
- Even on higher loads, the efficiency would be above 96 %
- The efficiency reduces rapidly at lower loads than the load for maximum efficiency
- While designing a transformer, the weight of iron and copper are selected such that copper loss is equal to iron loss for average transformer load factor. This ensures high ή during the operation
Width of maximum right of way permitted as per forest conservation act ‘1980 and its subsequent amendment dated 25 th October, 1992, are as per Table 1. Researches are being carried out for further optimizing the Right of Way. Guidelines of forest environmental rules shall be followed to avoid excessive tree cutting i.e. all the trees should be cut from root level in the 3 m corridor below each line conductor / earth wires. In the balance corridor, trees branches are only to be lopped to attain the specified clearance as per Table 1. Table 1 – Guidelines for Right of Way as per forest conservations act 1980 and subsequent amendment dated 25 th October, 1992 Line voltage (kV) 66 110 132 220 400 500 HVDC 765 Row width (Meter) 18 22 27 35 52 52 85 Electrical clearance: Electrical clearance while power lines crossing each other. In case of power line crossings, minimum clearance between lowest conductor of line and ground wire / top conductor of ...