Method and apparatus for preventing coil induced delay in a automatic transfer switch
US5748432A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 9, 1996 |
| Grant date | May 5, 1998 |
| Priority date | — |
| Expiry date | Oct 9, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H2300/018
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An automatic transfer switch for transferring a load between a normal power source and an alternate power source has a control circuit which senses the movement of the plunger of the switch-actuating solenoid into a position proximate the plunger stop or pole piece and then turns off power to the coil current so that the plunger can be restored to its rest position as the inertia of the switch enables completion of the transfer. Upon interruption of voltage to the coil, the coil is switched in series with a resistance which rapidly dissipates the residual current generated by the collapsing field within the coil to alleviate the braking effect of the residual coil current on the solenoid plunger.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.