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This compilation includes packages #1-4 from The Relay Testing Handbook that discuss the generic principals of relay testing for modern digital relays. This compilation describes: 1. Electrical fundamentals that all relay testers should understand including phasors, transformer connections and operation, symmetrical components, and grounding. 2. Relay testing fundamentals including different test philosophies and test techniques. 3. Test sheets and documentation that should be included in every relay testing report 4. The most commonly applied digital logic interfaces with detailed instructions and plenty of examples to help the tester convert and understand different logic from different manufacturers. 5. A step-by-step procedure that will allow the reader to create and implement a protective relay test plan. Get more information at http://valenceonline.com/book.php