Schweitzer Engineering Laboratories, Inc.

Bharat Nalla

Mauricio G Silveira

Nishchal Sharma

David James Dolezilek

Arun Shrestha

Tony J Lee

Manodev J Rajasekaran

Lisa Gayle Nelms

Karen S J Wyszczelski

Sajal Harmukh

Andrew A Miller

Bryon S Bridges

Vinodev E Rajasekaran

Derek Lautenschlager

Priyanka Nadkar

Ozan Akyildiz

Sathish Kumar Mutha

Stephanie L McDaid

Andrew W Rash

Jaya R A K Yellajosula

Lihua Ran

Guillermo Ramirez Conejo

Edson L Hernandez Cortinas

Rajeev Kumar Babu

This disclosure pertains to systems and methods to detect network errors in a parallel redundant protocol (PRP) network. A node-level redundancy error subsystem of an intelligent electronic device (IED) maintains records (e.g., counts) of information associated with missing duplicate frames expected from node devices on the PRP network via redundant first and second local area networks (LANs). Non-zero counts of missing duplicate frames may be identified as network errors.

Parallel redundancy protocol error detection

A fiber optic communication system may include a transmitting subsystem, a receiving subsystem, a power monitoring subsystem, a temperature monitoring subsystem, an alarm subsystem, and a data logging subsystem. The transmitting subsystem may be configured to transmit optical signals encoding data into an optical path. The receiving subsystem may be configured to receive the optical signals transmitted by the transmitting subsystem and decode the data encoded in the optical signal. The power monitoring subsystem may be configured to measure a power of the optical signal during normal operations. The temperature monitoring subsystem may monitor the temperature of the fiber optic communication system at various locations. The alarm subsystem may generate an alarm if the system operates outside of certain thresholds. The data logging subsystem may log the measured temperatures and optical signal power of the fiber optic communication system.

Fiber optic signal monitoring

Disclosed herein is a system for time aligning electric power system measurements at an intelligent electronic device (IED) using samples and sample time offset from merging units. The merging units do not require access to a common time signal. The IED does not require storage of a communication latency with the merging units. The sample time offset corresponds to a latency between obtaining the sample and receipt of the sample at the IED. The IED aligns samples from various merging units using sample time offset values communicated from the merging units to the IED. The IED performs monitoring and protection functions using the time aligned samples.

Sample time offset alignment of electric power system samples independent of a common time source

Systems and methods are disclosed to monitor real-time digital data for degradation. In one embodiment, an intelligent electronic device ('IED') in an electric power system may include an interface to receive a stream of digital data, the stream of digital data comprising a plurality of data frames. A protective action subsystem may monitor the sampled digital data and implement a protective action based on the stream of sampled digital data. A digital data degradation detection subsystem may analyze a plurality of digital metrics associated with the plurality of data frames and make a determination regarding degradation of a communication channel based on whether the plurality of digital metrics fails at least one threshold. In response to the determination, the digital data degradation detection subsystem may implement a response to the determination that the plurality of digital metrics fails at least one threshold.

Real-time digital data degradation detection

Systems, methods, and devices are provided for determining a maintenance mode of one or more merging units of an electric power delivery system using an intelligent electronic device that may rely on communication from wired (or wireless) electrical measurement devices. The intelligent electronic device may be a line relay. The merging units may provide data to the line relay including at least one bit indicating a maintenance mode of each merging unit. If a maintenance mode bit from a particular merging unit indicates that the merging unit is in the maintenance mode, logic of the line relay may determine if a maintenance mode override is received. If so, the line relay may disregard the maintenance mode bit and process the data from the merging unit. If the logic determines that the merging unit is in the maintenance mode, the line relay may force data from the merging unit to zero.

Systems and methods for enabling a maintenance mode of protection devices in digital secondary systems

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Pullman, WA, United States of America

Bharat Nalla