Varelen Electric Co., Ltd

Conservator vs. Hermetically Sealed Distribution Transformers

2025-02-17

Conservator-type transformers and hermetically sealed transformers. Both serve the same fundamental purpose—stepping down voltage for distribution—but they are different  in design, maintenance requirements also different, and suitability for specific applications. 

hermetically sealed transformer

 

What is the Conservator-Type distribution Transformer?

Three phase conservator-type transformer is a traditional design that uses an external conservator tank to manage the expansion and contraction of transformer oil caused by temperature fluctuations. The conservator is connected to the main tank and partially filled with oil, leaving an air space above it. A breathing system, often equipped with a silica gel breather, allows air to enter and exit the conservator as the oil level changes.

Product Features:

 

What is a Hermetically Sealed type Transformer?

Hermetically sealed oil immersed transformer is a modern, maintenance-free design that eliminates the need for a conservator tank. Instead, the transformer is completely sealed, and oil expansion is managed internally. There are two common designs:

  1. Gas Cushion Design: Uses inert gas (like nitrogen) to accommodate oil expansion.

  2. Diaphragm Design: Employs a flexible diaphragm or bladder to separate oil from air.

Key Features:

 

Which One Should You Choose?

The choice between a conservator-type and hermetically sealed transformer depends on your specific requirements:

  1. Choose a Conservator-Type Transformer  :

    • You need a cost-effective solution for large-scale outdoor installations.

    • You have the resources for regular maintenance and monitoring.

    • The transformer will be installed in a controlled environment with minimal exposure to harsh conditions.

  2. Choose a Hermetically Sealed Transformer  :

    • You require a low-maintenance solution for indoor or urban installations.

    • The transformer will operate in harsh or humid environments.

    • You want a longer lifespan and reduced operational costs.

 

Advantages of Each Design

Conservator-Type Transformers:

Hermetically Sealed Transformers:

 

Conclusion

Both conservator-type and hermetically sealed transformers have their unique advantages and applications. Conservator-type transformers are a cost-effective choice for larger, outdoor installations where maintenance is manageable. On the other hand, three phase hermetically sealed distirbution transformers offer a maintenance-free, reliable solution for indoor or harsh environments.

When you selecting a transformer, consider factors such as installation location, environmental conditions, maintenance capabilities, and long-term operational costs. By understanding the differences between these two designs, you can make an informed decision that ensures optimal performance and longevity for your power system.

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