Schweitzer Engineering Laboratories, Inc.

Stephanie L McDaid

Tony J Lee

Lisa Gayle Nelms

Mauricio G Silveira

Bharat Nalla

Nishchal Sharma

Bryon S Bridges

Glenn C Bethmann

Vinodev E Rajasekaran

Derek Lautenschlager

Andrew W Rash

Guillermo Ramirez Conejo

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

The present disclosure relates to systems and methods for testing communication systems. In one embodiment, a communication device tester may include a traffic disciplining subsystem to generate a first stream of data packets satisfying a metric and may communicate the first stream of data packets to a test device in a first test scenario. A delay subsystem may generate a variable delay in a second stream of data packets and communicate the second stream of data packets to the test device in a second test scenario. A data corruption subsystem may corrupt a third stream of data packets and communicate the third stream of data packets to the test device in a third test scenario. A test subsystem may determine whether the test device satisfies at least one criterion of each of the first test scenario, the second test scenario, and the third test scenario.

Communication system tester and related methods

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Kennewick, WA, United States of America

Stephanie L McDaid