Claims
- 1. In an electrical generating system with a multi-phase generator having a field circuit and a source of current for said field circuit, a voltage regulator, comprising:
- a source of signal representing average generator phase output voltage;
- means for comparing said average output voltage signal with a reference and for generating a signal representing a voltage error;
- means for adding said average output voltage signal to said error signal;
- means responsive to the sum of said signals for controlling the current from said current source to said generator field; and
- means responsive to a generator phase fault for blocking said average output voltage signal from said adding means.
- 2. The voltage regulator of claim 1, including:
- means for sensing the level of the high phase current; and
- means responsive to an excessive phase current for blocking the average output voltage signal to the adding means.
- 3. The voltage regulator of claim 2 in which:
- the means for adding the average and error signals is a summer having inputs for each of said signals and including:
- a switch connected between the source of average voltage output signal and the summer input;
- a microprocessor having a high phase current input;
- means in said microprocessor responsive to a high phase current in excess of a selected level for generating a control signal; and
- means responsive to said control signal to open said switch upon the occurrence of an excessive phase current.
- 4. In an electrical generating system with a multi-phase generator having a field circuit and a source of current for said field circuit, a voltage regulator, comprising:
- a source of signal representing average generator phase output voltage;
- means for comparing said average output voltage signal with a reference for generating a signal representing a voltage error;
- a circuit responsive to said error signal for controlling the current to said generator field; and
- means responsive to an excessive phase voltage difference for reducing the gain of the circuit of the voltage error signal.
- 5. The voltage regulator of claim 4 including:
- a microprocessor having phase voltage inputs;
- means in said microprocessor for subtracting the low phase voltage from the high phase voltage to establish a phase voltage difference;
- means in said microprocessor responsive to a phase voltage difference in excess of a selected level for reducing the error signal circuit gain.
RELATED APPLICATIONS
This application is a division of Ejzak et al. U.S. application Ser. No. 189,776, filed Sept. 22, 1980, now U.S. Pat. No. 4,403,292 a continuation of Ser. No. 43,804, filed May 30, 1979, now abandoned.
US Referenced Citations (4)
Divisions (1)
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Number |
Date |
Country |
Parent |
189776 |
Sep 1980 |
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