Calculations are done. Just comment on the results; how the different combinatio

Question

Calculations are done. Just comment on the results; how the different combinations would perform in/affect a power system.

Given the following available components, using all possible combinations of transmission tower and conductor, calculate the resistance, inductance and capacitance for a 500 km line. In a couple of paragraphs, comment on the results i.e. how the different combinations would perform in/affect a power system Bundle Spacing is 0.4 m 12 m 12 m 500 kV Transmission Tower Configuration A1 C2 8 m 12 m Bundle Spacing is 0.4 m B1 82 8.5 m CI A2 345 kV Transmission Tower Configuration

Explanation / Answer

Here bundled conductors are used .Bundled conductors reduce the GMR(Geometric mean Radius of power lines).This causes the inductance to be low,and capacitance to be high.

In the first configuration horizontal lines are used.In the second configuration hexagonal configuration is used.

The first configuration has three conductors per phase while second configuration has two conductors per phase so the first one has GMR as (9th root of r'^3*0.4^6)

(Read 2^3=8)

The second one has GMR of r'*0.4

Similarly the Game's can be calculated.

As far as the operation of different configurations is concerned, Following points must be kept in mind.

1)A low value of resistance means less losses.So efficiency increases .

2)A low value of series inductance means that voltage regulation will be high.As inductance dominates over resistance,low value of inductance is desirable ,because this leads to less voltage drop.Moreover ,the maximum power transfer capability increases,as it is inversely proportional to the series reactance.

3)High value of capacitance causes high charging currents.Increased Ferranti effect at light loads.It also leads to high dielectric losses.

So keeping above points in mind we can analyse the different configurations.Blue bird seems to be best choice according to me.

Hope that helps...

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