Two-Stage Vacuum Oil Purifiers: Key Features & Benefits

A two-stage vacuum oil purifier is a high-efficiency system designed to dehydrate, degas, and remove solid contaminants from various oils, including insulating oil (e.g., transformer oil), turbine oil, hydraulic oil, and lubricating oil. By utilizing two sequential vacuum chambers, it achieves a significantly higher purification level and greater processing efficiency compared to single-stage units.

Core Features & Advantages

1. Enhanced Vacuum Dehydration & Degassing

    Two-Stage Process: Oil passes through primary and secondary vacuum chambers, extending its exposure to vacuum conditions for superior removal of dissolved water and gases.

    Exceptional Results: Effectively reduces water content to ≤5 ppm and gas content to trace levels, making it ideal for oil used in EHV/UHV transformers.

2. Advanced Filtration System

    Multi-Stage Filtration: Typically combines stainless steel mesh pre-filters with high-precision particulate filters to eliminate mechanical impurities, sludge, and fine particles.

    High Cleanliness: Restores oil to target cleanliness levels (e.g., NAS classes), protecting critical machinery components.

3. Reliable Heating & Temperature Control

    Efficient Heating: Employs low-watt-density heaters to uniformly increase oil temperature without causing localized overheating or oil cracking.

    Precise Regulation: Automated temperature control ensures optimal viscosity for vacuum processing while conserving energy.

4. Strong Insulation Recovery

    High Dielectric Strength: Post-treatment, the oil's breakdown voltage is typically restored to ≥70 kV, ensuring reliable insulation performance and equipment safety.

5. Automated Operation & Safety

    Intelligent Control: Features PLC or microprocessor-based automation for continuous monitoring of vacuum, temperature, oil level, and flow rates.

    Built-in Protections: Includes automatic alarms and shutdown functions for safe, unattended operation.

6. High Flow Rates & Versatility

    Large Capacity: Available in a wide range of flow rates, from 600 L/H to 24,000 L/H, to suit various applications.

    Broad Application: Primarily used for critical insulating oil treatment, but is equally effective for purifying turbine, hydraulic, and lubricating oils requiring high dryness.

Typical Applications:

    Purification and pre-filling of oil for high-voltage (HV) and ultra-high-voltage (UHV) power transformers.

    On-site maintenance during transformer installation or servicing at substations, power plants, and industrial facilities.

    Reclaiming off-spec oils to meet stringent operational standards.

Summary:

The two-stage vacuum oil purifier offers superior performance in removing water, gas, and solids compared to single-stage models. It is the preferred solution for preparing and maintaining insulating oil in critical high-voltage applications, ensuring it meets the highest standards for dielectric strength and operational safety.