What are two faults detectable by motor circuit analysis?

Motor circuit analysis involves evaluating the electrical parameters of a motor in order to identify various types of faults that may impact its performance. In this context, winding contamination and insulation to ground faults are critical issues that can be detected through motor circuit analysis.

Winding contamination refers to any foreign materials—such as dirt, moisture, or chemicals—that may affect the insulation and functionality of motor windings. These contaminants can lead to increased resistance or create short circuits, subsequently causing overheating or failure of the motor.

Insulation to ground faults occur when the insulation that separates the winding of a motor from its casing or the ground breaks down. This can lead to leakage currents, which are not only dangerous but can also result in electrical failures and reduced operational efficiency.

In contrast, the other options focus on faults or disturbances that are not primarily detected through motor circuit analysis. Vibration and noise disturbances are often monitored through vibration analysis techniques rather than electrical analysis. Thermal overload and mechanical wear typically pertain to the mechanical side of motor operations, and while they can affect performance, they aren't detected through circuit analysis. Air gaps and electrical efficiency focus on operational parameters tied to performance rather than faults.

Thus, winding contamination and insulation to ground faults stand out as key faults that can be effectively detected