IEEE 1564-2014

IEEE 1564-2014 is a technical guide for voltage sag indices, helping engineers describe and compare short-duration voltage dips in power systems. It is relevant to power, energy, and industrial applications where voltage quality can affect equipment performance and process continuity. By defining consistent ways to characterize sag events, this standard supports clearer analysis, better communication between stakeholders, and more dependable power quality reporting for systems, components, circuits, and devices.

About IEEE 1564-2014

This guide focuses on voltage sag indices and the methods commonly used to quantify and interpret them. IEEE 1564-2014 gives a structured framework for describing sag magnitude, duration, and related characteristics so that measurements can be compared more consistently across studies or sites. For engineers working with power quality, the document is useful when evaluating disturbance data, selecting metrics, or documenting system behavior. Its role is to improve clarity in the assessment of voltage sag performance.

Where is IEEE 1564-2014 used?

IEEE 1564-2014 is typically used in utility studies, industrial power quality assessments, and equipment-sensitive facilities where voltage sags can interrupt operations or trigger nuisance trips. It is also relevant in testing and monitoring workflows that examine supply quality for motors, drives, controls, and other electrical loads. In these settings, the guide helps teams apply the same indices when reviewing recorded events, comparing feeder performance, or documenting compliance-related observations for power and energy systems.

Importance in practice

In practice, IEEE 1564-2014 matters because voltage sag data can be difficult to compare without a common reference. Using a consistent guide supports more reliable testing, design review, and procurement decisions, especially where power quality affects production continuity or equipment tolerance. It can also reduce misunderstandings between utilities, consultants, and facility teams by aligning how events are measured and reported. For organizations managing disturbance performance, this improves consistency and lowers the risk of inconsistent interpretation.

• Voltage sag index definitions
• Power quality measurement context
• Event comparison and reporting
• Industrial and utility applications