Patent
Metering and protection system for an A.C. power system
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TLDR
In this article, 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 is presented.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.read more
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References
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Journal ArticleDOI
Application of Walsh Transform to Statistical Analysis
TL;DR: It is shown that moments can be generated taking the Gibb's derivative of the Walsh spectrum and that products of Walsh spectra yield the distribution of dyadic sums.
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TL;DR: In this article, individual rectified phase voltages are produced and applied to individual opto-isolator units whose output photo diodes are connected in a series string, each photo diode has a zener diode connected across it with the zener diode mutually connected in series.
Journal ArticleDOI
Result of Field Experiments of Digital Relays Utilizing Mini-Computer and MicroProcessor
TL;DR: The digital relay system by micro-processors was developed with the optical fiber data transmission facilities to protect the transmission signals from surge and noise disturbances and successfully went through the factory tests on the artificial transmission line (ATL).