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P1668 - IEEE Draft Recommended Practice for Voltage Sag and Interruption Ride-Through Testing for End Use Electrical Equipment Less than 1,000 Volts

The purpose of this recommended practice is to clearly define test methods and ride-through performance for determining electrical and electronics equipment sensitivity to voltage sags. Analysis of real world sags provides the foundation for both the test methods and the criteria, aligning themselves as closely as possible to the end user's electrical environment. The recommended practice will define the characteristics of the voltage sags depths, durations, phase angle, and vectors required to relate to real world based voltage sag events. The recommended practice will show how different voltage sag testing methods can be used to simulate real world sags. End users will be able to use the recommended practice in their purchase specifications to ensure the required level of performance. In addition, end users can use the voltage sag criteria as a performance benchmark for existing equipment.This document is a non-industry specific recommended practice for voltage sag ride-through performance and compliance testing for all electrical and electronic equipment connected to low voltage power systems that can experience malfunction or shutdown as a result of reductions in supply voltage lasting less than one minute. The recommended practice includes defining minimum voltage sag immunity requirements based on actual voltage sag data. A section dedicated to the detailed analysis of voltage sags experienced by end users provides insight into real-world voltage sags. Testing procedures and test equipment requirements are clearly defined within this document to reflect this electrical environment including single-phase, phase-to-phase, three-phase, and unbalanced voltage sags. The recommended practice also defines certification and test reporting requirements, including voltage sag ride-through equipment characterization.
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