Relay with current transformer
US8169762B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 20, 2009 |
| Grant date | May 1, 2012 |
| Priority date | — |
| Expiry date | Jun 19, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F38/30
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Current transformer relays having dual functions as current transformers and electromechanical switches are described. The current transformer relay includes a relay coil and a conducting loop concentric with the relay coil. Additional functions are thus provided in addition to the main relay switching function or functions. The concentric nature of the relay coil and the conducting loop create a current transformer between these elements. The additional functions include the ability to measure an alternating current (AC) current conducted by the conducting loop, the ability to detect and interpret an information signal imposed on power lines connected to the conducting loop, the ability to induce or impose an information signal on the conducting loop for transmission to power lies connected to the conducting loop, and the ability to measure a differential current between currents carried by the conducting loop and a second concentric conducting loop.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.