33kV ACSR Overhead Line's Parameters

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Thanks WareEagle.

Dear rshaikh,

WareEagles search [10SDMS01] gives cable parameters for 33 kV 70 & 150 sq.mm but the inductance and capacitance of a line depends on wire diameter and spacing and configuration (e.g D or . . . ) as installed. Do you want formulae or have you found data for your dimensions??

67model

Thanks for the reply. I have not found the data yet. Please provide the formulae you mentioned.

Useful Data Sheet Information :-

http://www.eland.co.uk/documents/ACSR%20Conductor%20Cables.pdf

1. Inductance - single phase, two wire line (total loop value of circuit); (μ°/4∏)[ 1 + 4ln{(d - r)/r} ] Henries per metre run. N.B. μ° = Permeability of free space = 4∏/(10^7): ∏ = 3.14159 : ln = logarithm to base 2.7183... (e): d = distance between conductor centres, r = conductor radius : d & r must be in same units e.g. feet or metres
2. Inductance - 3 phase, Line to Neutral - equilateral configuration (conductor spacing d) = half of value in 1. above. N.B. The neutral is theoretical for a 3 wire line.
3. Inductance - 3 phase, Line to Neutral - mean value for configuration other than equilateral. In place of d, use value D = ³√(d12.d23.d31) where d12 = distance conductor 1 centre to 2 centre, d23 = distance conductor 2 centre to conductor 3 centre, d31 = distance conductor 3 centre to conductor 1 centre.
4. Capacitance - single phase, 2 wire line (remote from earth); ∏εº/(ln{(d - r)/r}) Farads per metre where εº = permittivity of free space (air has relative permittivity of 1) = 8.85/(10^12), other values as in 1. above.
5. Capacitance - 3 phase, Line to Neutral - equilateral configuration (conductor spacing d) = 2 x value in 4. above. N.B. The neutral is theoretical for a 3 wire line.
6. Capacitance - 3 phase, Line to Neutral, configuration other than equilateral - use mean value D in place of d, like 3. above.
7. Approximate parameters for 33 kV 50 Hz overhead line, 2 metre conductor spacing, 5.2 m ground clearance, with 100 sq.mm copper section (13mm diameter), per phase, per kilometre are 0.18 ohms, 1.14 milliHenry and 0.01 microFarad at 20 Celsius.
8. Magnetization losses of steel core affect resistance loss, depending on current, up to about 10% increase over DC. Skin effect has small effect, up to about 1% increase.