Does the performance of high-voltage motors get affected by thermal corrosion?

Yes, the performance of high-voltage motors is significantly affected by thermal corrosion. This process, often driven by high temperatures and corrosive environments, leads to a gradual degradation of critical components, ultimately impacting efficiency, reliability, and operational lifespan.

Here is a breakdown of the key effects:

1. Insulation System Degradation

• Accelerated Aging: High temperatures and corrosive agents (e.g., sulfur, chlorine compounds) cause insulation materials to become brittle and lose dielectric strength.

• Increased Risk of Failure: This leads to a higher probability of partial discharge​ and eventual insulation breakdown, resulting in short circuits.

2. Conductor and Connection Damage

• Increased Resistance: Thermal corrosion forms oxides or sulfides on conductors and contact surfaces, increasing resistance at connections.

• Hot Spots: This creates localized overheating, which further accelerates corrosion in a destructive cycle, potentially leading to connection failures.

3. Mechanical Component Wear

• Bearing Damage: Corrosive environments attack bearing surfaces and degrade lubricants, increasing friction, vibration, and the risk of seizure.

• Structural Weakening: Components like the rotor shaft can suffer from stress corrosion cracking, compromising mechanical integrity.

4. Observed Performance Impacts

• Reduced Efficiency: Energy losses increase due to higher resistance and mechanical friction.

• Overheating: Motors run hotter even under normal load conditions.

• Unreliable Operation: Increased vibration, noise, and unexpected shutdowns become more frequent.

In summary, thermal corrosion is a critical failure mechanism that requires proactive mitigation through environmental controls, protective coatings, and rigorous condition monitoring.