Preventive maintenance tapping and duty cycle monitor for voltage regulator
US7408275B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 23, 2004 |
| Grant date | Aug 5, 2008 |
| Priority date | — |
| Expiry date | Apr 7, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H2009/0061
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
Automatically changing the tap position in a load tap changer includes noting a polarity of a first tap position of a load tap changer. A duration for which one or more consecutive tap positions of the load tap changer collectively have had the noted polarity also is noted. The one or more consecutive tap positions include the first tap position. The duration for which the one or more consecutive tap positions collectively have had the noted polarity is compared to a threshold value. A change is made from the first tap position to a second tap position with a polarity that is different than the noted polarity when the duration for which the one or more consecutive tap positions collectively have had the noted polarity is longer than the threshold value. A change may be made from the second tap position back to the first tap position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.