Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Magnetic saturation
Reexamination Certificate
2005-12-27
2008-10-07
Hollington, Jermele M (Department: 2829)
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Magnetic saturation
Reexamination Certificate
active
07432699
ABSTRACT:
The present invention relates to a transformer being protected against direct current induced by geomagnetic flux changes, so called zero sequence current, whereby it comprises at least one compensation winding for direct current on the transformer core to compensate for undesired magnetization, by adding a current opposite to the direction of the magnetization caused by the zero sequence current carried by the alternating current to be transformed to reduce high magnetization saturation levels.
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“Study and discussion of methods for mitigating and eliminating geomagnetically induced current (GIC)”; Xiangdang et al.,; Automation of Electric Power Systems; China; 2000, vol. 24, No. 7; pp. 58-60.
“Transformer Design Considerations for Mitigating Geomagnetic Induced Saturation”; Viana et al.; IEEE Transactions on Magnetics, vol. 35, No. 5; Sep. 1999; pp. 3532-3534.
Forskarpatent I SYD AB
Gauthier & Connors LLP
Hollington Jermele M
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