Search Results: 'undervoltage'


2 results for "undervoltage"
The Relay Testing Handbook: Principles and Practice By Chris Werstiuk
Hardcover: $159.95
Ships in 6-8 business days.
This hardback book includes most of the volumes in the The Relay Testing Handbook series and includes: Electrical fundamentals; Relay testing fundamentals; How to translate digital logic used by... More > relay manufacturers into familiar concepts; and Best practices for creating and implementing test plans. Entire chapters are dedicated to the most commonly used protective elements including: Overvoltage, undervoltage, and frequency (59/27/81); Time, instantaneous, and directional overcurrent (51/50/67); Simple and transformer differential (87) testing with three or six current channels; and Line distance (21) testing using realistic test plans to minimize setting changes. Each protective element chapter includes: A description of operation written for a relay tester, not for a design engineer; Step-by-step test techniques that maximize your effectiveness and efficiency; Realistic examples from various relay manufacturers and models. Go to for more information.< Less
The Relay Testing Handbook #5: Testing Voltage Protection (59/27/81) By Chris Werstiuk
Paperback: $23.95
Ships in 3-5 business days
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... More > (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 for more information< Less