Toroidal core current transformer with phase compensation circuit
US8212535B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 17, 2006 |
| Grant date | Jul 3, 2012 |
| Priority date | — |
| Expiry date | Oct 30, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R15/181
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Disclosed is a toroidal core current transformer comprising a primary conductor which penetrates the toroidal core and a secondary winding that is wound around the toroidal core. A measuring shunt (RSh) or a load (Zb) is provided at the secondary end. In order to compensate the phase error (f) between the primary current (IP) and the secondary current (Is), a compensation circuit (K) whose capacity (C) is measured substantially according to equation (I) or (II) is provided at the secondary end. In equation (I) or (II), C represents the capacity of the compensation circuit, ω represents the radian frequency, φ represents the phase error between the primary current and the secondary current, Rsh represents the resistance of an optional measuring shunt, and Zb represents the impedance of an optional load.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.