The Relay Testing Handbook #8D: Testing Differential Protection (87)As modern protective relays become increasingly more powerful and complex, many relay testers continue to use test procedures and philosophies that are based on previous generations of relays and their limitations. Modern relays have very different characteristics that require a different testing philosophy to ensure that they will operate when required. This volume is designed to help you: Understand the basic characteristics of differential protection Review the application and ensure that it has been applied correctly Develop effective and efficient three- and six-phase test procedures that minimize setting changes The following topics are described with realistic, practical examples and detailed instructions: Understanding simple differential protection for motors and generators Defining minimum pickup and slope Determining which settings are most important Understanding transformer differential protection Determining correct phase shifts through transformers Recommended steps to correctly calculate and test differential protection using six channels Recommended steps to correctly calculate and test differential protection using three channels Testing harmonic restraint Tips and tricks to overcome common obstacles This book is included in the hardcover book The Relay Testing Handbook: Principles and Practice, or it can be ordered by itself as a soft-cover book, Adobe Acrobat PDF digital download, or both. Paperback: 160 pages Trim Size: 8.5"x11" Publisher: Valence Electrical Training Services LLC Language: English ISBN-13: 978-1-934348-16-1 LCCN: 2012934623 |
Contents
Percent Differential 87 Element Testing | 39 |
UnrestrainedDifferential Testing | 125 |
Bibliography | 139 |