The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 13, 1981
Filed:
Mar. 28, 1978
Hiroaki Aotsu, Nakaminato, JP;
Akira Isono, Hitachi, JP;
Masuo Goto, Hitachi, JP;
Koichi Kimura, Hitachi, JP;
Yasushi Momochi, Hitachiota, JP;
Takaaki Kai, Ibaraki, JP;
Satoshi Kitamura, Hitachi, JP;
Akihisa Kaihara, Hitachi, JP;
Hirosi Okada, Katsuta, JP;
Hitachi, Ltd., both of, JP;
Hitachi Engineering Co., Ltd., both of, JP;
Abstract
A field control apparatus for a generator having a field winding comprises a terminal voltage control unit for controlling a field current of the generator in accordance with a difference between a terminal voltage signal of the generator and a reference voltage signal, which control unit has at least one of a line drop compensation function, an under-excitation limitation function, an over-excitation limitation function, a power factor regulation function, an armature winding over-current compensation function and a cross-current compensation function. The field control apparatus includes a detector as a common signal source for detecting active power and reactive power components at an output terminal of the generator and means responsive to the output of the detector for performing scalar operation in accordance with a function of the added compensation/control function described above. An output of the operating means is added to the differential signal as an added function signal to control the field current for excitation of the field winding.