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Polarization and depolarization measurements of alumina-filled epoxy samples are presented. Discussed are the effects of temperature and electric field, as well as the dependences on sample thickness, contacting method and aging duration on DC currents. Such investigations are crucial to establish reliable generic conduction models usable on real-scale HVDC insulation components.
To conclude, the InAs/GaAs QD devices display radiation-tolerant DC characteristics despite high total dose of gamma radiation. No permanent ionising damage to the III–V compound semiconductor devices has been observed. The off-state leakage current is not worsened even when the device is continuously irradiated by gamma radiation. The results show great promise of InAs/GaAs QD structure for realization...
The transformer can be illuminated by the T-type equivalent circuit model. The primary and secondary leakage impedance characterizes the copper losses and the exciting impedance reflects iron-core losses. The iron-core losses and the copper losses can be obtained by open-circuit and short-circuit test. However, the copper losses of the primary winding and the secondary winding cannot be separated,...
Recently, various kinds of extreme exciting conditions, such as the ac-dc hybrid excitation, are applied to transformers, reactors etc. with the development of the HVDC system. The modeling and estimation of stray-field losses are of increasingly importance in the electromagnetic design of such devices, and it is challenging to measurement and numerical analysis.
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