Mississippi State University
Intro to Electrical & Computer Engineering
Power System Application Laboratory
(PSAL)September 25, 2003
Schweitzer Engineering Laboratory, Inc.
SEL Project
Motivation
• Brief Overview of power engineering
• Show that power engineering relates to many areas of ECE
• Show that power engineering has high tech applications of technology
• Educate & Recruit ECE students in the area of power
Power =
Utility
Power > Utility
Our Society Requires Energy
12%more
25%more
35%more
44%more
0%
10%
20%
30%
40%
50%
60%
2005 2010 2015 2020
By 2020, U.S. Electricity Needs Will Increase by 44%
Source: U.S. Department of Energy
50% of U.S. Electricity Supplied by Coal
20% of U.S. Electricity Supplied by Nuclear Energy
16% of U.S. Electricity Supplied by Natural Gas
7% of U.S. Electricity Supplied by Hydroelectric
3% of U.S. Electricity Supplied by Oil
2% of U.S. Electricity Supplied by Renewables
The Main Interconnections of the U.S. Electric Power Grid
Power Flow
Power Substation
High Voltage Transmission Lines
Transmission Substation
Power Plant
Undergraduate Power Related Courses:
Fundamentals of Energy Systems
Power Transmission
Power Distribution
High Voltage
Insulation Coordination in Electric Power Systems
Power Systems Relaying and Controls
For more information:
Website: www.ece.msstate.com
What is Protective Relaying?
Protective Relaying is one of several features of the power system design that is concerned with minimizing damage to equipment and interruptions to service when
electrical failures occur.
Primary Function: Cause the prompt removal of any element of a power system when it starts to operate in any abnormal manner
Secondary Function: Provide indication of the location and type of failure
Types of Protective Relays
• Electromechanical
• Solid State
• Digital (Microprocessor)
Protective Relay Requirements
• Measure Power System Voltage, Current, and Breaker Position
• Detect Power System Fault– Short circuit via overcurrrent, current differential,
impedance, undervoltage, etc.
• Trip Breaker– Isolate fault portion of the power system
• Communicate with Computer Systems• Communicate with Humans
Protective Relay Requirements
• Dependable – Always operates for power system faults in the zone of
protection
• Secure– Does not operate during normal power system
conditions or for faults outside the zone of protection
• Fast– Detects and clears faults in milliseconds
• Accurate– << 5% error over a wide range of fault conditions
Generating Demonstrations and Laboratories
Using A Power Relaying Test System
Mike Collum, Schweitzer Engineering Labs (SEL)
Noel N. Schulz,
Haibin Wang,
Yanfeng Gong,
Nick Amann, &
Derrick Cherry
Mississippi State University
Allison Robinson,
Mississippi School of Math & Science
(MSMS)
System Data Flow DiagramSystem Data Flow Diagram
All the Data flows are bi-directional
• Use PC to change the setting or get results from Adaptive Multi-Channel Source (AMS) through serial communication link
• AMS & Relay interact via serial communication
Check out…
Broken Relays
Demos