Polling loop short and overload isolator (VSOI)
US6985344B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 19, 2002 |
| Grant date | Jan 10, 2006 |
| Priority date | — |
| Expiry date | Jun 8, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/52
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A Vplex polling loop device is disclosed which can automatically detect and isolate shorted or overloaded sections of a polling loop, before or after polling loop power and signaling is switched to the output of the device, permitting normal operation of the remaining portion of the polling loop. The Vplex short and overload isolator (VSOI) is usable on former, existing, and future polling loop systems without the need for any software or hardware changes to the associated controls, and may also be used on 2-wire DC voltage distribution systems within the voltage and current limits of the VSOI. It is capable of multiple use anywhere on a polling loop while requiring minimum power from the polling loop. Finally, in the process of detecting and isolating a short or overload on its output, it prevents that short or overload from causing other VSOI devices on the loop to erroneously disconnect their protective branches of the loop.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.