Transformers are critical components in power distribution networks, and their longevity depends on effective moisture control. Dry air generators play a vital role in maintaining optimal conditions inside transformer conservators by supplying moisture-free air, preventing insulation degradation and internal corrosion. However, like any mechanical system, dry air generators require regular maintenance to ensure reliable performance.

In this blog, we’ll explore the best maintenance practices to keep your dry air generator running efficiently, ensuring uninterrupted transformer protection.

1. Regular Inspection of Desiccant Material

The desiccant (typically silica gel or molecular sieve) is the heart of the dry air generator, absorbing moisture from the incoming air. Over time, it becomes saturated and loses effectiveness.

Check desiccant color changes (if using color-indicating silica gel).

Monitor dew point readings—rising levels indicate desiccant exhaustion.

Replace or regenerate desiccant as per manufacturer guidelines (usually every 6–12 months).

2. Monitor and Maintain Air Filters

Dust and contaminants can clog filters, reducing airflow and forcing the system to work harder.

Inspect intake filters monthly and clean or replace them if clogged.

Check for oil or moisture contamination in compressed air supply (if applicable).

Use high-efficiency particulate air (HEPA) filters in dusty environments.

3. Verify Proper Airflow and Pressure

Insufficient airflow can lead to inadequate drying, while excessive pressure may damage components.

Check pressure gauges regularly to ensure they match recommended settings.

Inspect tubing and connections for leaks or blockages.

Test blower or compressor performance to confirm consistent airflow.

4. Calibrate and Test Dew Point Sensors

Accurate moisture monitoring is crucial for transformer protection.

Calibrate dew point sensors annually to ensure precise readings.

Compare sensor data with manual hygrometer tests for consistency.

Replace faulty sensors immediately to avoid undetected moisture ingress.

5. Lubricate Moving Parts (If Applicable)

Some dry air generators have motors, fans, or compressors that require lubrication.

Follow manufacturer recommendations for lubrication intervals.

Use only approved lubricants to avoid damaging components.

Check for unusual noises or vibrations, which may indicate wear.

6. Perform Seasonal Maintenance Checks

Environmental conditions affect dry air generator performance.

Increase inspections during monsoon or high-humidity seasons.

Ensure heaters (if equipped) are functional in cold climates to prevent freezing.

Check for corrosion or rust in coastal or industrial areas.

7. Keep a Maintenance Log

Documenting maintenance activities helps track system health and predict failures.

Record filter changes, desiccant replacements, and sensor calibrations.

Note any abnormal readings or corrective actions taken.

Schedule future maintenance based on historical data.

Conclusion

A well-maintained dry air generator is essential for preventing moisture-related transformer failures. By following these best practices—regular desiccant checks, filter maintenance, airflow monitoring, and sensor calibration—you can ensure continuous, reliable operation. Proactive maintenance not only extends the life of your dry air generator but also safeguards your transformers from costly moisture damage.