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Transformer Evacuation Vacuum Syatems

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Transformer Evacuation Vacuum Syatems

A transformer evacuation vacuum system is crucial for the proper maintenance, installation, and operation of oil-filled power transformers. It effectively removes air, moisture, and gases from both the transformer tank and insulating oil, helping to prevent dielectric failure and ensuring the continued efficiency of the insulation. Here's an overview of the key components and functions of this system:

1. Purpose of the Evacuation Vacuum System:

  • Air and Moisture Removal: Before oil filling, the transformer’s tank needs to be evacuated to remove air and moisture, which can cause partial discharges and reduce insulation strength.
  • Degassing Transformer Oil: Vacuum systems help remove dissolved gases from the insulating oil, improving its dielectric properties.
  • Leak Detection: Ensuring a tight, sealed system by checking for pressure drop under vacuum.

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Preventing dielectric failure and maintaining insulation efficiency

2. Components of a Transformer Evacuation Vacuum System:

  • Vacuum Pump: The core of the system — often rotary vane or roots-type pumps — to create and maintain the vacuum.
  • Vacuum Gauge: Measures the pressure inside the transformer tank to ensure optimal evacuation levels.
  • Moisture Trap: Captures water vapor extracted from the transformer during evacuation.
  • Oil Mist Separator: Prevents oil mist from contaminating the vacuum system and environment.
  • Control Panel: Manages and monitors the system’s operation, pressure levels, and safety functions.


3. Evacuation Process:

  • Preparation: Ensure the transformer tank and pipelines are clean and sealed.
  • Vacuum Creation: The pump reduces pressure in the tank to a specified level (usually below 1 mbar).
  • Holding Time: Maintain vacuum to allow moisture and gas removal from insulation materials.
  • Oil Filling Under Vacuum: Transformer oil is filtered and de-gassed before being introduced to the vacuumed tank, ensuring no air pockets remain.


4. Safety and Efficiency Considerations:

  • Monitoring Pressure Levels: Consistently track vacuum levels to prevent over pressure or leakage.
  • Avoiding Contamination: Ensure oil used is properly filtered and de-gassed before filling.
  • Proper System Sizing: The vacuum pump capacity should match the transformer’s volume and evacuation requirements.

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