Measuring transformer for measuring of a current flowing in an electrical conductor
US4749939A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 9, 1986 |
| Grant date | Jun 7, 1988 |
| Priority date | — |
| Expiry date | Jun 9, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R15/207
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A measuring transformer for measuring a current flowing in an electrical conductor is disclosed. Illustratively, the transformer comprises a three legged ferromagnetic core whose center leg at least partially surrounded by the electrical conductor. The center leg defines a center air gap and two outer air gaps, the center gap containing a magnetic field snesor and one outer gap being located at each end of the center leg. The two outer gaps are longer than the center gap when measured in the longitudinal direction of the center leg. The center leg and the magnetic sensor may form a single construction element. This configuration permits an especially precise, simple, and dependable installation of the measuring transformer, without worsening non-linearities or phase errors, while improving air-gap tolerances.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.