Modern relays have very different characteristics that require a different testing philosophy to ensure that they will operate when required. The Relay Testing Handbook: Testing Voltage Protection (59/27/81) provides step-by-step procedures for testing the most common voltage and frequency protective applications.
This volume is designed to help you understand and test: Overvoltage protection (59; Undervoltage protection (27); Over/under frequency protection (81). Each chapter explains the following topics for each element with realistic, practical examples and detailed instructions: Understanding the application; Determining which settings are most important; Recommended steps to correctly plan, perform, and evaluate pickup tests; Recommended steps to correctly plan, perform, and evaluate timing tests; Preventing interference from other settings inside the relay; Tips and tricks to overcome common obstacles. Go to http://valenceonline.com for more information
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