Circuit arrangement for detecting the current of a current conductor in order to activate electronically controllable tripping devices
US6147847A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 24, 1999 |
| Grant date | Nov 14, 2000 |
| Priority date | — |
| Expiry date | Jun 24, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H3/006
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A circuit arrangement for detecting the current of a current conductor in order to activate electronically controllable tripping devices, having a line voltage supply unit, with the operating voltage generated by the line voltage supply unit being compared to a reference voltage and the tripping device being activated by a limit voltage that forms when an overcurrent occurs. The a.c. voltage transmitted via secondary phase windings is rectified and supplied to a microprocessor device in the form of an operating voltage by the phases that are not in the measuring state. The processor-controlled phase measurement is performed without load, producing a precise measurement result.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.