Apparatus for rapidly detecting and calculating the root mean square of electrical measuring values in alternating current networks
US4041370A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 1, 1975 |
| Grant date | Aug 9, 1977 |
| Priority date | — |
| Expiry date | Oct 1, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E40/10
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for rapid acquisition and handling of root mean square values of the time dependent current and/or voltage in single or multi-phase a.c. mains wherein each of these values is converted into two intermediate values shifted in phase by 90.degree. and fed into a computer circuit the output of which provides analog d.c. signals indicating the reactive or actual power, or the r.m.s. values of the voltage and current dependent upon the particular type of computer which is used. The analog d.c. signals are fed into a following regulator unit having an integrating portion to adjust a regulating value to serve as a nominal value which is then compared with an applied actual value and the difference therebetween is then fed into the regulator unit. The control signal at the output of the regulator unit is read periodically and transmitted to a final control element and the regulating value is adjusted during the course of one or a fraction of one cycle of the a.c. mains frequency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.