Home » English riddles » Wiring and Cabling » Wiring Riddle No.2 – 11 kV Cable Testing – High Pot Test » Reply To: Wiring Riddle No.2 – 11 kV Cable Testing – High Pot Test

Reply To: Wiring Riddle No.2 – 11 kV Cable Testing – High Pot Test

#1946
Hamid

    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