Contactor health monitor circuit and method
US9267974B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 18, 2012 |
| Grant date | Feb 23, 2016 |
| Priority date | — |
| Expiry date | Jul 15, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01R43/002
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In one possible implementation, a method is provided for determining contactor health including measuring a differential voltage between a first utility line voltage and a second utility line voltage on a primary side of a contactor and on a secondary side of the contactor. The measuring is performed with both an unloaded current and with a load current. The unloaded and loaded measurements are performed at the primary side and the secondary side, and are made with the contactor closed. It includes determining a difference between a secondary unloaded voltage and a secondary loaded voltage and subtracting a difference between a primary unloaded voltage and a primary loaded voltage to provide a contactor voltage drop. The contactor resistance is determined by dividing the contactor voltage drop by the loaded current.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.