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In a 3-core extra-high voltage cable, a metallic screen around each core-insulation is provided to
- a)Facilitate heat dissipation
- b)Give mechanical strength
- c)Obtain longitudinal electric stress
- d)None of the above
Correct answer is option 'C'. Can you explain this answer?
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Explanation:
In a 3-core extra-high voltage cable, a metallic screen around each core-insulation is provided to obtain longitudinal electric stress.
- Longitudinal Electric Stress: Longitudinal electric stress is the stress that is developed along the length of the cable due to the applied voltage. It is caused by the electric field that is present between the conductor and the metallic sheath.
- Metallic Screen: The metallic screen around each core-insulation is provided to reduce the longitudinal electric stress. It acts as a shield and prevents the electric field from penetrating into the insulation. This reduces the stress on the insulation and improves the overall performance of the cable.
- Heat Dissipation: The metallic screen does not facilitate heat dissipation. Heat dissipation is usually achieved by providing a separate layer of insulation around the metallic sheath.
- Mechanical Strength: The metallic screen does not give mechanical strength. Mechanical strength is usually provided by the outer sheath of the cable.
Therefore, the correct answer is option 'C' - Obtain longitudinal electric stress.
In a 3-core extra-high voltage cable, a metallic screen around each core-insulation is provided to obtain longitudinal electric stress.
- Longitudinal Electric Stress: Longitudinal electric stress is the stress that is developed along the length of the cable due to the applied voltage. It is caused by the electric field that is present between the conductor and the metallic sheath.
- Metallic Screen: The metallic screen around each core-insulation is provided to reduce the longitudinal electric stress. It acts as a shield and prevents the electric field from penetrating into the insulation. This reduces the stress on the insulation and improves the overall performance of the cable.
- Heat Dissipation: The metallic screen does not facilitate heat dissipation. Heat dissipation is usually achieved by providing a separate layer of insulation around the metallic sheath.
- Mechanical Strength: The metallic screen does not give mechanical strength. Mechanical strength is usually provided by the outer sheath of the cable.
Therefore, the correct answer is option 'C' - Obtain longitudinal electric stress.
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In a 3-core extra-high voltage cable, a metallic screen around each core-insulation is provided toa)Facilitate heat dissipationb)Give mechanical strengthc)Obtain longitudinal electric stressd)None of the aboveCorrect answer is option 'C'. Can you explain this answer?
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