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Microprocessor-Based Relays: Implementation, Conflicts, and Corrective Actions. Steven V. Deases AEP – Station Engineer. Intro: Discussion Focus. Level: High-Level Topic Discussion Scope: Station Protection Questions: Reserve Questions until the Conclusion
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Microprocessor-Based Relays:Implementation, Conflicts, and Corrective Actions
Steven V. Deases
AEP – Station Engineer
Evolution of Protection Devices
Engineering Aspects Affected:
Develop internal Standard Schemes for Protection & Control using Microprocessor-based Relays that would replace existing Electromechanical Relays and phase them out
These replacement schemes would be designed with a “protection zone” scope (Line, Bus, Transformer, etc.)
The developed standards defined details such as:
The intent of the documentation was to communicate the standards to the design groups for implementation
Application Guides were written which described
CAD drawings with multiple layers were also developed to match the standard relay schemes
Despite the large effort in strategizing the implementation process, there still were several conflicts encountered:
To combat these engineering problems, we created and adopted…
SCADA Communication Components:
It was initially assumed that commissioning Microprocessor-based relays was essentially very similar to commissioning Electromechanical relays.
Test each protection element individually while monitoring trip output.
Technician can create his own test plan based on past electromechanical procedures.
The “Black Box” phenomena: one device that performs multiple functions with several different outputs (trips, alarms, targets, annunciations, etc.)
Element Testing vs. Functional Testing
Those installing the scheme often asked, “What’s the intent of the design?”
“How should the scheme operate for this scenario?”
The procedure for troubleshooting a mis-operation or failed test is much different than that of an electromechanical relay scheme