6. A 33 kV, three-phase, 2.5 km long feeder consists of single-core cables having a conductor radius of 12 mm and an insulation thickness of 8 mm. The dielectric has a relative permitivity of 3 and the power factor of the unloaded cable is 0.3. Determine the following: 1. capacitance per phase 2. charging current per phase 3. total charging kVAr 4. dielectric per phase and 5. maximum electric stress in the cable.
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Capacitance per phase: The capacitance per phase of a single-core cable can be calculated using the formula: C = 2πεr loge(D/d) / l, where εr is the relative permittivity, D is the outer diameter of the cable, d is the inner diameter of the cable, and l is the Show more…
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