If grease comes into contact with a motor winding, what is a possible effect on the winding insulation?

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Multiple Choice

If grease comes into contact with a motor winding, what is a possible effect on the winding insulation?

Explanation:
Grease can chemically attack and soften winding insulation, which reduces its ability to resist electrical stress. Hydrocarbon-based grease can seep into the winding varnish or enamel, degrade the insulation material, and trap moisture and contaminants. This weakens dielectric strength and increases the risk of insulation breakdown under operating voltage, making insulation deterioration a plausible and immediate effect. Grease primarily affects the insulation, not the bearings or causing immediate overheating by itself, and it won’t create a varnished coating on the windings.

Grease can chemically attack and soften winding insulation, which reduces its ability to resist electrical stress. Hydrocarbon-based grease can seep into the winding varnish or enamel, degrade the insulation material, and trap moisture and contaminants. This weakens dielectric strength and increases the risk of insulation breakdown under operating voltage, making insulation deterioration a plausible and immediate effect.

Grease primarily affects the insulation, not the bearings or causing immediate overheating by itself, and it won’t create a varnished coating on the windings.

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