Answer to Question #241740 in Electrical Engineering for abhishek

Question

(a) Connect two conductors to the sheath. Measure the capacitance, Cd between the remaining

single conductor and the two other conductors and the sheath. Take the capacitance between

the shorted cores and the sheath as Cb. Now determine the effective capacitance of each

conductor to the grounded neutral.

(b) A 61800 V concentric cable with two intersheaths has a core diameter of 2.8cm; dielectric

material of 3.8mm thickness constitutes three zones of insulation. Determine the maximum

stress in each of the three layers, if 21800 V is maintained across each of the inner two

layers.

(c) Derive the A, B, C, D constants for two transmission lines connected in parallel.

Answer 1

We can determine this using the equation:

Where:

r = radius of the inner conductor and d = 2r

R = radius of the sheath and D = 2R

ε₀ = permittivity of free space = 8.854 x 10^-12

ε_r = relative permittivity of the medium

Substituted: We obtain:

43.13 farad 

b) Given: A 61800 V concentric cable with two intersheaths has a core diameter of 2.8cm; dielectric

material of 3.8mm thickness constitutes three zones of insulation. Determine the maximum

stress in each of the three layers, if 21800 V is maintained across each of the inner two

layers.

 

Maximum stress is σ =F/A₀

 In this case, we compute this by dividing F by the cross-sectional area A0 of the deformed specimen. Stress becomes apparent in ductile materials after yield has started directly proportional to the force (F) decreases during the necking phase.

Substituted, we obtain: 3.123 F/A₀

c) ABCD parameters can be represented as follows:

We can derive these parameters for the problem stated are as follows