Question

Find the corona characteristic of 110 kV, 50 Hz, 3-phase transmission line, 175 km long consisting of three 1cm diameters stranded copper conductors spaced in 3 m delta arrangement. Temperature 26 0C and barometric pressure is 74 cm , m0 = 0.85, mv for local corona = 0.72 and mv for general corona =0.82

Answer 1

Answer:

Step-by-step explanation:

Answer 2

Answer:

The corona loss on the same system with supply frequency 25 Hz will be 0.667 kW/ phase /km

Step-by-step explanation:

From the above question,

We need to find the corona characteristic of 110 kV, 50 Hz, 3-phase transmission line, 175 km long consisting of three 1cm diameters stranded copper conductors spaced in 3 m delta arrangement.

Temperature 26 0C and barometric pressure is 74 cm , m0 = 0.85, mv for local corona = 0.72 and mv for general corona =0.82

F₁  = 50 Hz

F ₂ = 25 Hz

P₁  = 1 Kw/Phase

P ₂  = ?

Corona Loss = α (F + 25)

P₂/ P₁ = (F₂ + 25) / (F₁ + 25)

P₂/ 1 = (25 + 25) / (50 + 25)

P₂ = (50) / (75)

P₂ = 0.66666...

P₂ ≈ 0.667 kW/ phase /km

So,

The corona loss on the same system with supply frequency 25 Hz will be 0.667 kW/ phase /km

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