Voltage frequency meter of synchronous electrical machine

Details Voltage frequency meter of synchronous electrical machine Voltage frequency meter of synchronous electrical machine

1979-09-24

1981-09-15

Dixon, Harold A.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

328140, H03K 500, H03K 522

Patent

active

042899745

ABSTRACT:
The invention is concerned with a voltage frequency meter of a synchronous electrical machine, comprising a voltage converter connected to inputs of two frequency measuring channels which have their outputs connected via a voltage follower to an input of a voltage comparator. Each of the frequency measuring channels includes a zero-crossing detector, two transistor switches, a differentiating circuit, a charging resistor, a decoupling diode, an isolating diode and a storage capacitor. The first transistor switch of each channel has its output connected via the charging resistor to a power source and via the isolating diode to the output of the second transistor switch and to the storage capacitor which is connected via the decoupling diode to the input of the voltage follower. In one of the frequency measuring channels, the input of the second transistor switch is connected via the differentiating circuit to the output of the zero-crossing detector of the other frequency measuring channel. The power source is also connected to an adjusting resistor whose movable contact is connected to the outputs of the second transistor switches of both frequency measuring channels.

REFERENCES:
patent: 2999168 (1961-09-01), Henry
patent: 3471792 (1969-10-01), Axford
patent: 3717818 (1973-02-01), Herbst
patent: 3969677 (1967-07-01), Woyton

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