Electricity: power supply or regulation systems – Remote sensing
Patent
1975-10-01
1977-08-09
Pellinen, A. D.
Electricity: power supply or regulation systems
Remote sensing
323119, H02J 318
Patent
active
040413705
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.
REFERENCES:
patent: 3900792 (1975-08-01), Moltgen
patent: 3906337 (1975-09-01), Depenbrock
patent: 3936727 (1976-02-01), Kelley et al.
patent: 3940687 (1976-02-01), Akhundov et al.
BBC Brown Boveri & Company Limited
Pellinen A. D.
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