초록 ▼

An excitation control system for a generator includes a silicon controlled rectifier bridge having an input interconnected with a plurality of alternating current (AC) phases of positive and negative polarity, an output interconnected with the field input of the generator in order to provide an exci

An excitation control system for a generator includes a silicon controlled rectifier bridge having an input interconnected with a plurality of alternating current (AC) phases of positive and negative polarity, an output interconnected with the field input of the generator in order to provide an excitation voltage thereto, and an SCR segment for each of the positive and negative polarities of the AC phases. Each of the SCR segments has an SCR responsive to a control signal in order to control current conduction within the segment between the input and the output of the SCR bridge. A regulator circuit requests a maximum value of the excitation voltage for the generator. The auxiliary contacts of a generator circuit breaker determine when the generator is on-line and connected to a power circuit. A phase lock loop provides an error signal from the AC phases. A control circuit outputs control signals to the SCR segments in order to control current conduction within the segments. The control circuit includes a force fire circuit which repetitively and simultaneously outputs the control signals to each of the SCR segments in response to: (a) the error signal exceeding a predetermined value, (b) the maximum value of the excitation voltage for the generator is requested by regulator circuit, and (c) the auxiliary contacts determine that the generator is on-line, in order that the SCR bridge emulates a diode bridge.

대표청구항 ▼

[What is claimed is:] [1.]a controlled rectifier bridge including an input interconnected with a plurality of alternating current phases each of which has a positive polarity and a negative polarity, an output interconnected with the input of said rotating electrical apparatus in order to provide sa

[What is claimed is:] [1.]a controlled rectifier bridge including an input interconnected with a plurality of alternating current phases each of which has a positive polarity and a negative polarity, an output interconnected with the input of said rotating electrical apparatus in order to provide said excitation voltage thereto, and a segment for each of said positive and negative polarities of the alternating current phases, each of said segments having an element responsive to a control signal in order to control current conduction within said segment between the input and the output of said controlled rectifier bridge;means for requesting a maximum value of said excitation voltage for said rotating electrical apparatus;means for determining when said rotating electrical apparatus is on-line;means for providing an error signal from the alternating current phases; andmeans for outputting the control signals to said segments in order to control current conduction within said segments, said means for outputting including means for repetitively and simultaneously outputting the control signals to each of said segments in response to: (a) said error signal exceeding a predetermined value, (b) the maximum value of said excitation voltage for said rotating electrical apparatus is requested by said means for requesting; and (c) said means for determining determines said rotating electrical apparatus is on-line, in order that said controlled rectifier bridge emulates a diode bridge.