29-06-2012, 06:11 PM
Microprocessor-Based Relays: Implementation, Conflicts, and Corrective Actions
Microprocessor-Based Relays.ppt (Size: 711 KB / Downloads: 143)
Intro: Presenter’s Background
Work Group:
AEP Transmission Region Operations – Texas
Technical Support Engineering
Station Equipment and Protection & Controls
Job Functions:
Application Engineering & Design Review
Technical Aid to Field Personnel
Project Coordination & Administrative Support
Technical Training of Technicians and Engineers
Process Improvement & Quality Control
System Performance Analysis & Reporting
Microprocessor Technology
Advantages
More sensitive and scalable
Communication Options
Fault Oscillography and SER data
Better targeting and annunciation
More reliable; failure alarm also included
Advanced protection features all in one box
Economical both Financially and Physically
Disadvantages
Shift in Thought: Digital Logic v. Circuitry
More Complex Logical Systems
Longer Commissioning Procedures
Additional Training Requirements
Engineering Processes
Implementation Strategy:
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:
relay brand/model options
general protection scheme with generic wiring
relay panel plate configurations
relay setting templates with predetermined logic
Documentation:
The intent of the documentation was to communicate the standards to the design groups for implementation
Application Guides were written which described
What standard schemes were available
Where the standard schemes were to be applied
What kind of protection was intended
The general relay setting philosophy
CAD drawings with multiple layers were also developed to match the standard relay schemes