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Detecting and Managing Voltage Unbalance for Improved Equipment Reliability
This white paper examines the causes, measurement, and impacts of voltage unbalance in three-phase power systems. It demonstrates how even small voltage deviations can significantly increase motor heating, reduce equipment lifespan, and introduce harmful harmonics in DC converters. The paper highlights the ease of measuring voltage unbalance using standard RMS voltage data and PMI’s ProVision software, providing actionable insights for monitoring and mitigating unbalance issues.
Key topics include:
- Introduction to Voltage Unbalance
- Causes of Voltage Unbalance in Polyphase Systems
- Calculating Voltage Unbalance
- Impacts on Motors and DC Converters
- Measurement Techniques Using PMI Recorders and ProVision
- Interpreting and Visualizing Unbalance Data
- Industry Standards and Recommended Limits
Why utilities should care:
Understanding and monitoring voltage unbalance is crucial for minimizing equipment failures, reducing maintenance costs, and ensuring compliance with industry standards. Accurate measurement enables proactive mitigation of risks associated with motor overheating and harmonic distortion.
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