A cable carrying alternating current has
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Electrical Engineering · all questionsElectrical Cables
Electrical Cables
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In congested areas where excavation is expensive and inconvenient 'draw in system' of laying of underground cables is often adopted.
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The minimum dielectric stress in a cable is at
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The breakdown voltage of a cable depends on
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High tension cables are generally used up to
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Low tension cables are generally used up to
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A certain cable has an insulation of relative permittivity 4. If the insulation is replaced by one of relative permittivity 2, the capacitance of the cable will become
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The breakdown of insulation of the cable can be avoided economically by the use of
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In a cable, the maximum stress under operating conditions is at
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Capacitance grading of cable implies
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If a cable of homogeneous insulation has a maximum stress of 10 kV/mm, then the dielectric strength of insulation should be
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If the length of a cable is doubled, its capacitance
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Cables for 220 kV lines are invariably
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The metallic sheath may be made of lead or lead alloy or of aluminum.
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The insulating material should have
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The current carrying capacity of cables in D.C. is more than that in A.C. mainly due to
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Which of the following insulation is used in cables?
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It is difficult to maintain oil filled cables.
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Is a cable is to be designed for use on 1000 kV, which insulation would you prefer ?
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The electrostatic stress in underground cables is
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