Electrical transmission or interconnection systems – Plural supply circuits or sources
Patent
1998-10-29
2000-04-18
Gaffin, Jeffrey
Electrical transmission or interconnection systems
Plural supply circuits or sources
307 64, 307 87, H02J 300, H02J 904
Patent
active
060518936
ABSTRACT:
A fast changeover from one power system to another in the event of an irregularity in the power source system substantially reduces operating costs by minimizing a power loss in switches during conduction, dispenses with a cooling device for cooling a thyristor switch, and implements the thyristor switch in a compact and low-cost design. The power supply system for a load includes one switching apparatus for connecting a load to one power source system, and another switching apparatus for connecting the load to another power source system. Each of the switching apparatus includes a pair of thyristors connected in anti-parallel and a mechanical switch connected in parallel with the thyristor pair. The thyristor pairs and the mechanical switches are controlled so that the mechanical switches conduct a load current when the load is supplied with power from the one power source system in a steady power supply state. The thyristor switches conduct the load current during a power source changeover time within which the load is disconnected from one power source system and connected to the other power source system, and do not conduct the load current during the steady power supply state.
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"Static Transfer Switch: Increased Reliability & Redundancy Of Power At Critical Data Processing Centers", The CYBEREXpert, vol. 94, No. 15, 1994, pp. 1-12.
Fukada Masakazu
Kishida Yukimori
Koyama Ken-ichi
Maruyama Toshimasa
Sasao Hiroyuki
Gaffin Jeffrey
Mitsubishi Denki & Kabushiki Kaisha
Roberto Rios
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