Electrical transmission or interconnection systems – Plural supply circuits or sources – Load current control
Reexamination Certificate
2008-04-01
2008-04-01
Sherry, Michael (Department: 2836)
Electrical transmission or interconnection systems
Plural supply circuits or sources
Load current control
Reexamination Certificate
active
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.
REFERENCES:
patent: 4256972 (1981-03-01), Wyatt et al.
patent: 5210685 (1993-05-01), Rosa et al.
patent: 5502340 (1996-03-01), Schuster et al.
patent: 5670833 (1997-09-01), Mengelt et al.
patent: 5784240 (1998-07-01), Przywozny et al.
patent: 5808378 (1998-09-01), O'Leary et al.
patent: 6969976 (2005-11-01), Broach et al.
patent: 2005/0184592 (2005-08-01), Marwali et al.
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.
Bush Terry D
Heber Brian
Marwali Mohammad N
Powell Jeffery
Amaya Carlos
Liebert Corporation
Locke Lord Bissell & Liddell LLP
Sherry Michael
LandOfFree
Transfer switch device and method does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Transfer switch device and method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Transfer switch device and method will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3951149