- The time required for a transformer loaded at rated KVA and with constant temperature of cooling medium to reach steady temperature is called time constant of the transformer.
- It is expressed in hours
- For transformer capacity above 10 KVA
- For 11KV voltage class, it is 2.5 hours
- For 33KV voltage class, it is 2.75 hours
- For 66 KV voltage class, it is 3.0 hours
- For 132KV and above, it is 3.5 hours
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 ...