Electricity: electrical systems and devices – Safety and protection of systems and devices – With phase sequence network analyzer
Patent
1980-02-29
1982-12-28
Salce, Patrick R.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With phase sequence network analyzer
361 86, 324108, 324 86, H02H 326
Patent
active
043665217
ABSTRACT:
Negative sequence filters employing one to three operational amplifiers and a single reactive element generate the negative sequence voltage of a three phase AC power system by generating two line-to-line voltages, phase shifting one of them to bring them into phase and summing the resultant signals. The phase shifting circuit includes a potentiometer, one end of which serves as the input to the circuit and the other end of which is connected to the inverting input of an operational amplifier. A capacitor is connected between the tap point of the potentiometer and ground and the values of the components are selected so that the tap point of the potentiometer can be positioned to compensate for variations in the capacitive reactance of the capacitor without affecting the magnitude of the phase shifted signal.
REFERENCES:
patent: 2836771 (1958-05-01), Jessee
patent: 3184681 (1965-05-01), Bloniarz
patent: 4067053 (1978-01-01), Chow
patent: 4146913 (1979-03-01), Sun
patent: 4156186 (1979-05-01), Wolfinger
patent: 4210948 (1980-07-01), Waltz
Transaction Paper No. 56-440 from Applications and Industry, No. 25, American Institute of Electrical Engineers, Jul. 1956.
Pp. 82, 83 and 90-97 of "Symmetrical Components" by L. J. Myatt, Pergamon Press, 1968.
Lenart R. P.
Salce Patrick R.
Westinghouse Electric Corp.
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