Source-transfer switching system and method
US6137191A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 22, 1998 |
| Grant date | Oct 24, 2000 |
| Priority date | — |
| Expiry date | Dec 22, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02J3/007
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A control arrangement and method is provided for source-transfer switching systems including a high-speed control arrangement and high-speed switches to control the transfer of a load from one source to another with minimal transfer delays. The system supplies an electrical load with alternating current from either a first source or a second source via respective first and second switches. The system also includes a controller that samples the voltage waveforms of each of the first and second sources to detect when transfer between the sources is desirable, e.g. power outages, voltage levels that are either too low or too high, or reverse currents that indicate an upstream fault. The controller provides appropriate control signals to control operation of the switches and transfer supply of the load therebetween. In a preferred embodiment, after a transfer decision is made, the control arrangement initiates a transfer of the load from a first source to a second source with no intentional delay via the opening of a first switch and the closing of a second switch. In another embodiment, the control arrangement initiates a transfer by first opening the first switch and then closing the…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.