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موضوع
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During 11 kV Cable Testing (High Pot Test), why is a -ve Voltage of -11 kV applied B/W Phase to Ground and +/- 22 kV B/W Phase/Phase?
During 11 kV Cable Testing (High Pot Test), why is a -ve Voltage of -11 kV applied B/W Phase to Ground and +/- 22 kV B/W Phase/Phase? What is the Advantage and what leakage Current will you confirm healthyness of the Cable. Is 11 kV DC High Pot Test Good for the XLPE Cable or PILC Cable?
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پاسخها
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DC test voltage should be applied from phase to ground on each conductor with other conductors, shields, and metallic sheath connected to ground or other conductors guarded with shield and metallic sheath grounded. The test voltage values for DC hi-pot tests are based upon final factory test voltage, which is determined by the type and thickness of insulation, the size of conductors, the construction of cable, and applicable industry standards. The DC test values corresponding to AC factory proof test voltages specified by the industry standards are usually expressed in terms of the ratio of DC to AC voltage for each insulation system. This ratio is designated as K, which when multiplied by the acceptance test factor of 80% and maintenance factor of 60% yields the conversion factors to obtain the DC test voltages for hi-pot tests. The IEEE standard 400.1
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