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Saturday, 3 May 2014
12 electrical thumb rules to follow:
1. Transformer earthing wire / Strip size
Size of T.C or DGBody EarthingNeutral Earthing
<315 KVA25×3 mm Cu / 40×6 mm GI Strip25×3 mm Cu Strip
315 KVA to 500 KVA25×3 mm Cu / 40×6 mm GI Strip25×3 mm Cu Strip
500 KVA to 750 KVA25×3 mm Cu / 40×6 mm GI Strip40×3 mm Cu Strip
750 KVA to 1000 KVA25×3 mm Cu / 40×6 mm GI Strip50×3 mm Cu Strip
2. Motor earthing wire / Strip size
Size of MotorBody Earthing
< 5.5 KW85 SWG GI Wire
5.5 KW to 22 KW25×6 mm GI Strip
22 KW to 55 KW40×6 mm GI Strip
>55 KW50×6 mm GI Strip
3. Panel earthing wire...
What are advantages and disadvantages of corona loss?
ADVANTAGES AND DISADVANTAGES OF CORONA
Advantages
It acts as a safety valve by reducing the magnitude of high-voltage steep-fronted waves that may be caused by lightning or power switching.
With the formation of corona, the air surrounding the conductor becomes conductive and there is a virtual increase in the effective diameter of the conductor. Due to increased diameter, the maximum voltage gradient between the conductors is reduced.
Disadvantages
Transmission efficiency is affected due to corona loss. Even under fair weather conditions...
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