Transfer switch device and method

Electrical transmission or interconnection systems – Plural supply circuits or sources – Load current control

Reexamination Certificate

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Reexamination Certificate

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10904441

ABSTRACT:
This disclosure is concerned with devices and methods for voltage source transfer switching that reduces or eliminates transformer saturation due to DC flux built up during a transfer event. First and second voltage sources (primary and alternate) are connectable to a load via corresponding switches. A transformer is connected downstream of the switches. A controller operates the switches according to various transfer methods wherein a switching time is determined to minimize downstream saturation current.

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Mokhtari, H., et al.: “Performance evaluation of thyristor based static transfer switch”, IEEE Transactions on Power Delivery IEEE USA, vol. 15, No. 3, Jul. 2000, pp. 960-966.
PCT International Search Report for International Application No. PCT/US2005/004155 dated Jun. 17, 2005.
PCT Written Opinion of the International Searching Authority for International Application No. PCT/US2005/004155 dated Jun. 17, 2005.

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