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Uncovering Hidden Delta Voltage Unbalance in Three-Phase Systems

This white paper reveals how voltage unbalance, often masked in wye measurements, can cause severe heating and reduced lifespan in motors and VFDs connected in delta. It explains the role of phase angle shifts, demonstrates the phenomenon through lab and field data, and emphasizes the importance of matching measurement configurations to load connections for accurate detection and remediation.

Key topics include:

- Voltage Unbalance Defined
- Problems with Voltage Unbalance
- Theory
- In the Lab
- In the Field

Why utilities should care:
Accurate detection of voltage unbalance prevents costly equipment failures and downtime. Understanding phase angle effects and matching measurement setups to sensitive loads ensures reliable operation, reduces maintenance costs, and extends asset life in three-phase power systems.


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