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Showing 1 to 8 of 8 for “"Cable insulation"”.
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Partial discharge ageing of polymer insulation under combined AC and DC stress at elevated temperatures
Cable termination is the weakest part in any HV underground cable system, as defects may be left in the main insulation during the installation process. In HVDC systems, the converters produce the intended DC voltage for transmission but there may also be AC harmonics superimposed. The frequency of …
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The Impact of Electrical Standards on MVDC Shipboard Power Cable Size
… provide recommendations for shipboard MVDC power cable design and test values, and to examine how existing MVAC and MVDC standards affect MVDC cable size. A review of published standards and guidelines for MVAC cable design and test values is made and includes the collection of recommended …
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CLASSIFICATION OF HIGH IMPEDANCE FAULTS, INCIPIENT FAULTS AND CIRCUIT BREAKER RESTRIKES DURING CAPACITOR BANK DE-ENERGIZATION IN RADIAL DISTRIBUTION FEEDERS
… fault (IF) caused by partial breakdown to a cable insulation, and a circuit breaker (CB) malfunction due to capacitor bank de-energization to cause current restrikes. These abnormal events are not detectable by conventional protection schemes. In this dissertation, a new technique to identify …
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Current-Transformer Based Gate-Drive Power Supply With Reinforced Isolation
… turn at the primary side is proposed. A 20 kV insulation is achieved by the primary HV cable insulation across a toroid transformer core. The CI/O is designed less than 2 pF to mitigate the Common-Mode (CM) noise. A circuit topology analysis is performed and the …
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Dielectrometry measurements of moisture diffusion and temperature dynamics in oil impregnated paper insulated electric power cables
Paper insulated lead covered (PILC) cables have played an important role in underground power distribution for a hundred years. Replacing aged PILC before failure is critical to managing power distribution. Three prominent failure mechanisms accelerate cable aging: temperature stresses, moisture …
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Asset Management of Underground Cables Factoring Resilience
… located and repaired, whereas underground cables buried in ducts and trenches are more challenging to maintain, repair and replace. Generally, faults in underground cables are hard to locate until they gradually develop into large faults. In recent years, underground cables in New Zealand …