Power flow direction detector

Details Power flow direction detector Power flow direction detector

1981-10-27

1984-12-04

Strecker, Gerard R.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Nonquantitative

324142, 361 82, G01R 1914, G01R 2106

Patent

active

044867069

ABSTRACT:
A power flow detector for connection to power supply lines includes a phase difference-to-pulse width converter for producing pulse signals for which the pulse width corresponds to the phase difference between the load voltage and load current of the power supply lines. The output of the phase difference-to-pulse width converter is integrated and the integrated voltage is compared with a reference voltage. The power flow direction is determined by whether the integrated voltage is larger than or smaller than the reference voltage.

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patent: 4303881 (1981-12-01), Czerwien et al.
Staffin, Robert, 6 Ways to Measure Phase Angle, #6., Zero-Crossing Detection Methods, Control Engineering, Oct. 1965, p. 83.
H. P. Khinscha et al., "New Possibilities in Amplitude--and Phase--Comparison Techniques for Distance Relays," Proceedings IEE., vol. 117, No. 11, Nov. 1970.

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