Metering and protection system for an A.C. power system

Details Metering and protection system for an A.C. power system Metering and protection system for an A.C. power system

1979-08-09

1981-11-10

Miller, J. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

324141, 361 65, 364727, H02H 300

Patent

active

043001823

ABSTRACT:
A system for electronically metering an A.C. electrical power system to derive performance parameters such as real and reactive power useful in revenue metering and fault protection applications. Voltage and current sensors associated with the power system provide isolated output signals proportional to the voltage and current in the system. From these signals finite-duration impulse-response filters periodically determine Walsh function correlation coefficients by integrating the voltage and current signals at least once during each period of the power system and periodically sampling and holding the integrated signal in sequence with the integration. The present and a plurality of immediately preceding correlation coefficient values are stored in memory, and by combination of the correlation coefficients by addition, subtraction or multiplication, power system performance parameters, such as real power, reactive power, voltage, current, or power factor, are obtained for utilization in revenue metering or overload protection applications. Related methods are also disclosed.

REFERENCES:
patent: 3984737 (1976-10-01), Okamura et al.
patent: 4131847 (1978-12-01), Kohga et al.
patent: 4139878 (1979-02-01), Shuey
"The Use of Walsh Functions for High-Speed Digital Relaying", John W. Horton, May 12, 1975, A 75582-7.
"Result of Field Experiments of Digital Relays . . . Microprocessor", IFAC Symposium 1977, Suzuki et al., pp. 312-316.
"Application of Walsh Transform to Statistical Analysis", IEEE Trans. vol. SMC-1, No. 2, Apr. 1971, Pearl.

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