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Protective Relaying

Jim Phillips, P.E. will show you how to work with protective relays and determine optimal settings for protection and coordination in this first part of a two part class. The Class begins with the basics of overcurrent relays and progresses in Part 2 with more advanced topics including differential protection, generator protection, transformer protection and more. Coordination involving network systems where protective devices do not see the same current for the same event will also be addressed.

The Class includes many of the more common relay functions such as overcurrent, synch check, reverse power, differential protection schemes, frequency as well as many other relay functions and schemes. Participants will learn advanced topics such as how to construct protective relay time current curves and manually construct the ANSI C57 thru fault curves.

What You WILL Receive With this Protective Relay Class

  • Training manual containing over 250 pages for both days/parts.
  • Many relay setting example problems
  • Current transformer saturation worksheets
  • Access to Technical articles
  • Transformer Thur-Fault Protection
  • 16 hours of Continuing Education Credit for both days/parts.  8 hours for each day/part

Day One – Protective Relaying

  • INTRODUCTION
    Overcurrent Protection Concepts, Relay Coordination Data Requirements, Selective Coordination Principles, Zones of Protection, Minimizing Outages / Maximizing Reliability
  • SHORT CIRCUIT CONSIDERATIONS
    Three Phase and Line-to-Ground Faults, Short Circuit Calculations, Effect of Current Magnitude on Relay Settings, Relay Reach to End of Line
  • OVERCURRENT RELAY PROTECTION SCHEMES
    Time Current Graphs, Induction Disk Relay, Solid State / Digital Relays, Current Transformer Selection, Circuit Breaker, ANSI Protective Device Numbers
  • CURRENT TRANSFORMERS
    Polarity Markings, Current Transformer Saturation, Excitation Curves, Saturation Calculation Worksheets and Example Problems, Burden, CT Accuracy Class, CT Size vs. Saturation
  • OVERCURRENT RELAYS
    Amp Tap Settings, Time Dial Settings, Instantaneous Settings, Relay Time Margins, Safety Margins, Digital Relays, Electro-Mechanical Induction Disk Over Travel, Drawing Time Current Curves
  • COORDINATION OF RELAYS
    Curve Shapes and Characteristics, Inverse, Very Inverse, Extremely Inverse Characteristics, Coordinating Relays with Other Relays, Determining Optimal Settings, Relay Setting Problems
  • RELAYS FOR CONDUCTOR PROTECTION
    National Electrical Code Requirements, Conductor Damage Curves, Determining Relays Settings for Conductor Protection, Short Circuit Protection
  • GROUND FAULT PROTECTION RELAYS
    Residually Connected Relay Scheme, Zero Sequence Relay Schemes, Effect of Delta Wye Transformer Connection on Coordinating Ground Fault Relays
  • CASE PROBLEM
    Coordinating Protective Relays

Day Two – Protective Relaying

  • INTRODUCTION
    Types of Protection Schemes, Protecting Equipment, Design Criteria, Protection Standards and Defining Protection Requirements, Necessary Data for Determining Appropriate Settings
  • DIRECTIONAL RELAYS
    Relay Operating Principles, Use of Directional Relays, Polarizing Input, Use in Network Systems
  • TRANSFORMER PROTECTION WITH RELAYS
    NEC Article 450, Magnetic Inrush Current, ANSI C57 Thru Fault Curve, ANSI Transformer Protection Requirements, Adjustments for Transformer Winding Configuration, Performing Engineering Calculations and Constructing ANSI C57 Thru Fault Curves for Transformer Protection
  • DIFFERENTIAL PROTECTION CONCEPTS
    Overcurrent Differential Relays, Percentage Differential Relays, Bus Differential Relays, Current Transformer Selection, Saturation Issues, Current Transformer Polarity
  • TRANSFORMER DIFFERENTIAL PROTECTION
    Differential Protection, Percentage Differential Protection, Slope Settings, Delta-Wye Phase Shift Adjustments, Sizing Current Transformers to Compensate for Delta Connected Current Transformers
  • MOTOR PROTECTION
    Motor Protection Requirements, Motor Starting Characteristics, Motor Short Circuit Protection, Overload Protection, Motor Safe Stall Time
  • LOAD SHEDDING
    Local Generation, Loss of Utility, Back Feeding the Utility, Frequency Relays, Reverse Power Relays
  • GENERATOR PROTECTION
    Protection Requirements, 51V Relays, Generator Sub Transient Reactance, Short Circuit Decrement Curves, Synch Check Relay, Frequency, Reverse Power and Other Relay Functions, Generator Protective Schemes and Settings
  • Case Problem
    Transformer Protection – Creating ANSI C57 Thru Fault Curves and Setting Protective Relays

Questions?

For questions, registration information or to discuss holding this class at your location as an on-site training program

Brainfiller, Inc. | P.O. Box 12024 | Scottsdale, AZ 85267

800.874.8883​

480.725.7451

Program Director