EE 5223
Electrical Power System Protection

Spring Semester 2019
EERC L100 - M,W,F  2:05-2:55 pm

Dr. Bruce Mork | Office Hours

Course Syllabus | Text & References | Pre-Req Material | Useful Web Links | Grades to Date | Term Project Teams

Homework Cover Sheet - To be attached to all submitted homework.
Term Project Guidelines |
This Year's Term Projects
Examples of Term Project Reports: Ex1 | Ex2 | Ex3  | Example of Statement of Contributions

Updated Through: Week 14 (revisions as lectures progress)  

Week - Reading
Reference Mat'l

Lecture Notes

  Homework, Tests, Solutions, Deadlines

  1 - Ch. 1,2,3,10
Sub Schematics
Dev Nos | CTs

 Introduction, Startup, Philosphy of System Protection, Bus configurations,  Substation/Equipment Photos
 Bus configurations, Zones of protection, Protection & Operation Strategies
 CTs, Overlapping Zones Assignment #1 (short) | Soln 

2 - Ch. 5

ABB CO-9 Relay

Jan 21st
 MLK Day - No Lecture (Lecture 4 does not exist).
 Protective device numbers,  Instrument Transformers | Basic Info on MR CTs

 Assignment #2 - Probs. 3.1, 3.2, 3.3 | Due Jan 28th, 9am  (short problems, transformer connections)
Assignment #3A - Due: Feb 4th, 9am (in teams of 3: one BSEE and two MSEE).

Radial Prot
3 - G&S Ch.10,

12.5 & 12.6

L7 - Jan 28th

L8 - Jan 30th
L9 - Feb 1st

 Assn #3B: Symm Components - Due Feb 25th, 9am (in teams of 3) | 3-Ph Xfmr Phase Shift Tutorial

 Radial Protection Strategies, Fuse Characteristics, Aside for the Day: CCVTs and PLC.
Assignment #4
- Due Feb 11th, 5:00pm
 Example of radial coordination for ground faults | Video of previous |
Assignment #5 - Due Feb 18th 9am

4 - Ch.3,4
Sequence Conn
Series Unbalance

L10 - Feb 4th
L11 - Feb 6th

Feb 8th

 Effective burden on CT, CT stds, MR CTs, CT equivalent circuit
 Iterative method for CT accuracy calculations, ratio correction factor (RCF)

 Assignment #6 (Aspen Intro) – Due Feb 27th, 5:00pm
(Winter Carnival - Lecture 12 does not exist)

5 - Ch.3, Ch.5

 One-Paragraph Term Project Ideas - Due Feb 22nd 5pm (extension to Feb 25th 9am is possible).
Assignment #7 – Prob 3.4 & 4.1 | Soln - Due Mar 4th, 9:00am

6 - Ch. 3, 5, 6
G&S Ch.10

 L16 - Feb 18th

L17 - Feb 20th
L18 - Feb 22nd

 Misc Topics: Synch Check Relays (25/27), more on reclosing.  Reclosing on 69-kV 3-terminal line
V-I relationships during fault, intro to 67 relay application
 Polarization, Directional Phase & Ground Overcurrent Concepts.
Assignment #8 (due 9am Mar 18th)
 Wrapup on 67 relays, intro to distance relaying.  
7 - Ch. 6, Ch.12

L19 - Feb 25th
L20 - Feb 27th
L21 - Mar 1st

Demeny Notes

Suppl. Video
Suppl. Video
Suppl. Video
 Near-end faults, polarization memory, CCVT subsidence transient, limits of VT connections for zero sequence polarization.
 Basics of impedance protection
 More on distance/impedance protection, intro to differential protection

 Guest Lecture: Kevin Demeny. Topic: Arc Flash Hazards, Mitigation, Protection 
 Tom Ernst, Minn Power. Guest Tutorial on Aspen.  Arc flash hazard issues.  

Help Week7A: including pre-req review on symm components in context of homework 4.1.
Help Week 7B: general review of symm components, Zp <=> Zs, Sequence Networks
 Short Circuit Calcs - Dr. Bohmann Fault Tutorial, repeated from EE5200
 Term Project - Detailed Table of Contents (i.e. work plan) and reference list - due Fri of Week 9.
  8 - Ch.7

Ch. 4,12
L22 - Mar 4th

L23 - (Sp'11)

L24 - (Sp'11)
L22 (Sp'09)

L23 - Mar 6th
L24 - Mar 8th

Suppl. Video

Suppl. Video
 Fault Calcs for 2-winding transformers, 3-lines, phase shifts, Fault Calc Examples
 More on sequence networks - transformer phase shifts, zero sequence behaviors. 

 Fault Calcs, Sequence networks, fault contributions ; Assn#8A - ResonantGrnding - due 9am Mon Mar 20th.

Prof. Høidalen - Protection with isolated ground
 Prof. Høidalen - Protection with resonant grounding  
 Review: Sequence Network example, 3-winding transformers

 Review: Fault current contributioins, V and I at relay.
 Winding currents, zero seq currents in 3-winding xfmr

 Help Week8: observations on fault currents, hints on Hmwk 8, voltage profile along faulted line.
 Impedance Relaying, R-X diagrams, Zone 1, 2, 3, reach, forward & reverse.

 Basic distance relaying concepts; line differential protection, bus protection
 Pos/Neg/Zero squence networks for 3-winding transformers, zero-squence polarizing sources 

March 11-15th
Spring Break - Make a clean break from your work and have fun !

9 - Ch. 12,13

Ch. 4, Ch.9

 Midterm will consist of grades on two upcoming homework sets (worked individually).  Details to come.

Transmission Line relaying - read §6.5.5 - 6.7, §12.12 - §12.16.  Assn#9 - Due 9am Thurs Mar 28th
 Special issues related to line protection: Zone 2 and Zone 3, Ground potential rise
 Line protection issues (cont'd): three-terminal lines, series caps. 
Tom Ernst Guest Lecture (play video) - Setting Relays for Line Prot.,  File 1 | File 2 | File 3

10 - Ch. 4, Ch.9

Help Video

L28 - Mar 25th
L29 - Mar 27th

L30 - Mar 29th

 Assn#10: Probs 4.2, 4.3 a,b,c and 4.4 - Due Mon Apr 1st 9am.  Help: Notes (Video also on Canvas)

 Connection of Differential Relay to delta-wye transformer, phase shift, CT ratio 

 Transformer Protection (87T), zones and CT circuits, thermal ratings
 Transformer alarm/monitoring points, diagnostic tests, LTCs (Load Tap Changers)

 Transformer dissolved gas in oil, C57.104, insulation PF.  Nice cut-away of large transformer.

11 - Ch. 9, Ch.10
  87B Bus Prot - ABB
87B - Basler
587Z - SEL

L31 - Apr 1st

L32 - Apr 3rd

L33 - Apr 5th

 Differential protection of Transformers (87T) 87T Applications Example
 87T applications example, mismatch, CT saturation, Protection of Gnd Xfmrs & Shunt Reactor
 Bus Protection - 87B;
Bus Prot Homework #11 - Prob. 10.1 due Mon Apr 8th 9am
 87B Applications example | video: moderate-Z vs. high-Z. 

 Differential protection of Generators (87G)

12 - Ch. 10
Cap Bank Prot

L34 - Apr 8th
34a | 34b

L35 - Apr 10th
L36 - Apr 12th

 Intro to Cap Bank Protection Applications; Photo of 115-kV Cap Bank (2 banks, w/current-limiting reactor)
 Guest Lecture: Tom Ernst, Minn Power (posted on Canvas)
 Cap Bank  Protection | IEEE C37.99-2012 (download from Xplore)
 Cap Bank Wrapup; Synchronous Switching
 Submit working prototype (preliminary results) and rough draft of project report - Mon Apr 10th, 9am.  

13 - Ch. 8, Archive
Gen Prot  2

L37 - Apr 15th
L38 - Apr 17th

L39 - Apr 19th
Add'l Safety

 Transient Overvoltages due to Shunt Cap Bank Switching: Tutorial | ppt
 Generator Protection Basics - Volts/Hz; Overspeed Desctruction of small hydro - Pic 1 | Pic 2
IEEE 95 TP 102 Gen Protection Guide;
 Safety Issues - CT secondaries, step and touch potential, stray voltage, etc.

 Safety (cont'd); Relay impedance; Generator grounding; Grounding Transformers

14 - Ch. 14
Stability, Reclosing

 Guest Lecture on Electric Vehicle and related protection issues
 Last Homework - complete by end of week (may be possible to request extension to Tues Apr 30th, 5pm if no conflict with finals).
    [ Note: do as individual.  View "Hmwk#12 Office Hr" video / notes for most/much of solution and hints.]
Motor Protection Issues; SCADA overview; Intro to Smart Grid

 Semester Wrapup.   Paper on DSP methods for distance relaying SCADA Protocols;
 Term Project Final Report and ppt presentation - Due April 29th, 9am ET (no extensions granted) 

Finals Week

Mon Apr 29th

Final Exam Timeslot / Term Project Presentations - Location EERC 226 (3:00 - 5:00pm)

Course Description and Learning Goals:

Students who complete this course will have gained a theoretical and applied understanding of power system protection. The performance of
instrument transformers, transducers, protective relays, and circuit breakers is first addressed. These devices are then integrated into coordinated
protective systems for generators, transformers, transmission lines, reactors, capacitor banks, system buses, etc. Although basic protection concepts
are hardware-independent, the application of electromagnetic, solid state, and microprocessor-based relays will also be discussed. Trade-offs
between reliability, selectivity, speed, simplicity, and economy are emphasized. A hands-on lab project, using state of the art equipment, will also be
completed during the course.

Topics Covered (depending on priorities and available time):

Prerequisite Material

Course Text and other Useful References:

Useful Web links and other resources: