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The Relay Testing Handbook: Principles and Practice

Professional EngineerJourneyman Power System ElectricianElectrical Engineering TechnologistThe Relay Testing HandbookPrinciples and PracticeixTable of ContentsAuthor s Note vAcknowledgments viiChapter 1: Electrical Fundamentals 11. The Three-Phase Electrical System 12. Transformers 273. Instrument Transformers 344. Fault Types 405. Grounding 476. Sequence Components 527. Fault Types and Sequence Components 58 Chapter 2: Introduction to Protective Relays 651. What are Protective Relays? 652. Time Coordination Cur ves (TCC) and Coordination 73 Chapter 3: A Brief Histor y of Protective Relays 831.

Reasons for Relay Testing 95 2. Relay Testing Equipment 98 3. Relay Testing Methods 101 4. Relay Test Procedures 109 Chapter 5: Test Sheets and Documentation 135 ... Chapter 12: Simple Percent Differential (87) Element Testing 247 1. Application 247 2. Settings 257 3. Restrained-Differential Pickup Testing 259 4. Restrained-Differential Timing ...

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Bar Type CTs: Bar type CTs operate on the same principle of donut CTs but have a permanent bar installed as a primary conductor. An example of a bar type CT is shown in “Figure #5 – Bar Type CT.” Wound CTs: Wound CTs have a primary and secondary winding like a normal transformer. These CTs are rare and are usually used at very

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