Question 9.5: The capacitance of a 3-core lead sheathed cable measured bet...

Electrical Power Systems

The capacitance of a 3-core lead sheathed cable measured between any two of the conductors with sheath earthed is 0.19 μF per km. Determine the equivalent star connected capacity and the kVA required to keep 16 kms of the cable charged when connected to 20 kV, 50 Hz supply.

The "Step-by-Step Explanation" refers to a detailed and sequential breakdown of the solution or reasoning behind the answer. This comprehensive explanation walks through each step of the answer, offering you clarity and understanding.
Our explanations are based on the best information we have, but they may not always be right or fit every situation.

The blue check mark means that this solution has been answered and checked by an expert. This guarantees that the final answer is accurate.
Learn more on how we answer questions.

This Question has been Answered.

Already have an account?

Related Answered Questions

Question: 9.1

Determine the economic overall diameter of a 1-core cable metal sheathed for a working voltage of 85 kV if the dielectric strength of the insulating material is 65 kV/cm. ...

Verified Answer:

For economic size the ratio of the outer dia to th...

Question: 9.8

If the lead sheath resistance in the previous problem is 2.14 ohm per km and that of the conductor is 0.1625 ohm/km, determine the ratio of sheath loss to core loss of the cable. ...

Verified Answer:

The ratio of

\begin{aligned}\frac{\text { S...

Question: 9.7

Three single core lead sheathed cables carry three-phase current of 400 A. The nominal conductor area of the cores is 1.25 sq. cm, the sheath thickness is 0.152 cm and the diameter over the sheath is 2.28 cms. They are supported in equilateral formation with a distance between cable centres of 5.08 ...

Verified Answer:

From the figure, the mean radius of the sheath [la...

Question: 9.6

A 3-phase, 3-core, metal sheathed cable gave the following results on test for capacitance: (i) Capacitance between two conductors bunched with the sheath and the third conductor 0.4 μF per km. (ii) Capacitance between bunched conductors and sheath 0.625 μF/km. Determine the capacitance (a) between ...

Verified Answer:

From Figs. 9.13 (a) and 9.13 (b),

C_{x}=3 C...

Question: 9.4

A 66 kV concentric cable with two inter-sheaths has a core diameter 1.8 cm. Dielectric material 3.5 mm thick constitutes the three zones of insulation. Determine the maximum stress in each of the three layers if 20 kV is maintained across each of the inner two. ...

Verified Answer:

Refer to Fig. E.9.4. The overall radius of the cab...

Question: 9.3

A conductor of 1 cm dia passes centrally through a porcelain cylinder of internal dia 2 cms and external dia 7 cms. The cylinder is surrounded by a tightly fitting metal sheath. The permittivity of porcelain is 5 and the peak voltage gradient in air must not exceed 34 kV/cm. Determine the maximum ...

Verified Answer:

The configuration is given below: Let q be the cha...

Question: 9.2

A single core lead covered cable is to be designed for 66 kV to earth. Its conductor radius is 0.5 cm and its three insulating materials A, B and C have relative permittivities of 4, 2.5 and 4.0 with maximum permissible stresses of 50, 30 and 40 kV/cm respectively. Determine the minimum internal ...

Verified Answer:

In order to have minimum internal diameter of the ...