Schweitzer Engineering Laboratories, Inc.

Chandrasekaran Swaminathan

Veselin Skendzic

Angelo D'Aversa

Greg Rzepka

Sreenivas Dingari

Marcos A Donolo

Jay Hartshorn

Subhash C Patel

Vinod K Yedidi

Hamza Abubakari

Daniel P Dwyer

Balaji Janarthanan

Hang Li

Jyotsna Samhita Gokavarapu

Systems, devices, and methods include protection functions in an electrical power system. A processing subsystem may include a processor. A memory subsystem may comprise a first memory section and a second memory section. A memory management subsystem may, in a first operational mode, enable memory access between the processor and the first memory section and the second memory section and, in a second operational mode, enable memory access between the processor and only the first memory section.

Isolation of protection functions in electrical power systems

A method includes obtaining electrical measurements of an input signal of a power system. The electrical measurements are obtained at a sampling frequency and the input signal is indicative of an operating frequency of the power system. The method includes generating an intermediate signal from the input signal. The intermediate signal has a direct current (DC) component indicative of a magnitude and a phase of the input signal. The method includes filtering the intermediate signal using an adjustable length filter to obtain the magnitude and the phase of the input signal. The length of the adjustable length filter varies based at least in part on a period measurement of the power system.

Processing sinewave signals of variable frequency in a device with fixed processing rates

The present disclosure relates to systems and methods for processing a stream of messages in an electric power system (EPS). In one embodiment, a system may include a configuration subsystem to receive a plurality of criteria from an operator to identify a subset of the stream of messages for real-time processing. A receiver subsystem may identify the subset of the stream of messages based on at least one criterion from the plurality of criteria. A real-time processing subsystem may receive the subset of the stream of messages from the receiver subsystem, process the stream of messages within a fixed interval of a time of receipt, and update a value based on information in the processed stream of messages. A protective action subsystem may implement a protective action based on information in the processed stream of messages.

Messaging in an electric power system

A method includes receiving electrical measurements of an input signal of a power system. The method includes determining an estimated frequency of the power system using a rate of change of phase of the power system and using zero crossings of the power system. Selection between using the rate of change of phase of the power system and using zero crossings of the power system is based on a comparison between an estimated phase angle and a measured phase angle of the power system.

Frequency measurement for load shedding and accurate magnitude calculation

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Orefield, PA, United States of America

Chandrasekaran Swaminathan