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Magnetic field, produced by high current, accompanying with the electric field can generate electro-magnetic force in HVDC system, which enormously affects the treeing growth characteristics. Electrical tree behavior of silicone rubber(SiR)was investigated by stressed with repetitive pulse voltage considering magnetic field. The pulse frequency was set to 200 Hz, while the stressed pulse amplitude...
As one of the basic insulating materials, polyimide films have been widely used in the insulation system in wind turbine generators. However, the pulse voltage from the converter often causes overvoltage and localized high electrical field in the insulation system. Surface charge could affect the dielectric property and cause the breakdown of insulation. Direct fluorination is a method to modify the...
General Electric proposes to apply transformational technology in the form of low-temperature superconductivity to the design of direct-drive wind turbine generators of the 10-MW power level and greater. Generally, optimal steady state 4 K cryogenic cooling of a large thermal mass ( 10 000 kg) and its dimensions ( 4 m diameter and 2.5 m length) with minimum levelized cost of energy is difficult...
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