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The maximum demand of consumer has annual consumption of 700800 Units.If his maximum demand is 200 KW then the load will be?

 Given Data: Annual consumption = 700800 units Maximum demand  = 200 KW  Solution: Load factor = Average load / Maximum demand Average load = Annual consumption / Hours in Day * Number of days in a year                            = 700800 / 24*365                            = 79.8                             = 79.8 / 200                             = 0.4%
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A perUnit value of 4ohm.Resistor at 100MVA base 10KV base voltage is?

Given data: R= 4ohm MVA = 100 KV = 10  Solution: Find the base impedance Zb = (10)^2 / 100 = 1             = 4/1     = 4ohm
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Advantages of shielded rectors

 Solution: The reactors can apply all type of voltage. We can install the reactors both indoor and outdoor. It provides high safety factor against flash over. No magnetic field in the outside of the tank avoiding heating and forces in adjacent reactors. Shielded reactors provides high thermal capacity to avoid excessive heating.
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Advantages of bundled conductors

Solution:  Reduce the reactance . Reduce the voltage gradient. Reduce the corona loss. Reduce the radio interference. Reduce the search impedance. Increase power stability.
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Types of Insulator

Solution:  Pin insulator (Upto 33KV) Suspension type insulator (More than 33KV) Strain insulator (Less than 11KV) Shackle insulator (Low voltage)
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Disadvantages of corona

 Solution: It reduce the transmission line efficiency It cause inductive interference with communication lines More loss of energy Ozone produce corrosion of the conductor Non-sinusoidal voltage drop occurs It attenuates lightning surges 
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Advantages of Corona

 Solution:  Due to corona,the air surrounding the conductor becomes conducting and hence virtual diameter of the conductor is increased.The increased diameter reduces the electro static stresses between the conductor It reduce the effect of transient  It reduce the magnitude of high voltage It reduce the effect of surge 
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