At the simplest level, all three phases of voltage should always have the same magnitude. This imbalance can lead to stresses in each of the phase circuits in a three-phase power system. Potential faults may be in the cabling to the motor, the terminations at the motor, and potentially the windings themselves. An imbalance in impedance or load distribution can contribute to imbalance across all three of the phases. Three-phase distribution systems often serve single-phase loads.
Instrument to measure and diagnose: Fluke 438-II Power Quality and Motor Analyzer Impact: Motor winding insulation breakdown leads to early motor failure and unplanned downtime For example, a transient may appear on control cables that don’t necessarily cause equipment damage directly but may disrupt operations. Finding the source of these transients can be difficult because of the infrequency of the occurrences and the fact that the symptoms can present themselves in different ways. These transients, which vary in amplitude and frequency, can erode or cause insulation breakdown in motor windings. Adjacent loads turning on or off, power factor correction capacitor banks or even distant weather can generate transient voltages on distribution systems. Transient voltages can come from several sources either inside or outside of the plant. This article demonstrates how to detect the 13 most common causes of winding insulation and bearing failure in advance. Winding insulation breakdown and bearing wear are the two most common causes of motor failure, but those conditions arise for many different reasons. It’s important to remember that the causes of motor and drive issues are not confined to a single domain of expertise–both mechanical and electrical issues can lead to motor failure–and being armed with the right knowledge can mean the difference between costly downtime and improved asset uptime. Motors are used everywhere in industrial environments and they are becoming increasingly complex and technical, sometimes making it a challenge to keep them running at peak performance.
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