System for measuring phase currents in a 3-phase installation
US4933630A · kind A · utility
41Cited by
2References
2Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 18, 1989 |
| Grant date | Jun 12, 1990 |
| Priority date | — |
| Expiry date | Jul 18, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R15/181
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The invention relates to a system using Rogowski coils to measure the phase currents in a three-phase installation. Each coil (1, 2, 3) is connected firstly to a corresponding operational amplifier (10, 20, 30) connected as an integrator, and secondly to a corresponding inverter (100, 200, 300) whose output is connected to the inputs of the integrating amplifiers of the other two phases. With appropriately selected resistance values, mutual interference effects may be cancelled. The system is suitable for measuring phase currents in an installation housed in a cabinet or cubicle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.