RMS Measuring Principles in the Application of Protective Relaying and Metering

摘要

There are a variety of protective relays using different measuring techniques to provide protection for equipment and lines. These include electro-mechanical, solid state, and numerical relay platforms. Within each group, various types of front-end filtering exists. Protection Engineers should understand how today's and yesterday's relays differ in their approach to protection so they can better provide protection for feeders and other equipment.