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Fully sealed transformer

Understanding Fully Sealed Transformers

In demanding electrical distribution environments, reliability and longevity are paramount. The fully sealed oil immersed transformer represents a significant advancement in transformer technology, designed to operate with exceptional efficiency and minimal maintenance. Unlike conventional units, these transformers are completely sealed from the atmosphere, preventing the ingress of moisture and oxygen. This design fundamentally eliminates the need for a conservator tank and breather, protecting the insulating oil from degradation. For applications prioritizing durability and reduced lifecycle costs, this technology is often compared to and builds upon the foundation of the reliable S11-M oil immersed transformer, offering enhanced environmental protection and operational stability.


Technical Specifications and Design Advantages

The core of the Fully Sealed Transformer is its hermetic construction. The tank is welded shut after filling with high-grade, dehydrated, and degassed mineral oil. As the transformer operates and the oil temperature fluctuates, a specially designed corrugated or flexible tank wall allows for expansion and contraction without exposing the internal components to air. This permanent seal offers several key benefits: it prevents oil aging from oxidation, maintains consistent dielectric strength, and reduces fire risk by eliminating a direct air-oil interface. The design inherently supports a longer service life and is particularly well-suited for installations in humid, coastal, or polluted areas where atmospheric contamination is a concern.

Key Product Parameters

Standard Technical Data Table

Rated Capacity (kVA) High Voltage (kV) Low Voltage (kV) No-load Loss (W) Load Loss (W) No-load Current (%) Impedance (%)
100 11 0.4 170 1650 1.2 4
315 11 0.4 380 3650 1.0 4
630 11 0.4 660 6200 0.9 4.5
1000 11 0.4 970 10300 0.8 4.5
1600 11 0.4 1400 14500 0.7 5

The performance data above illustrates the high efficiency and low loss characteristics of the Fully Sealed Transformer. The combination of advanced core material and a pristine, uncontaminated insulation system ensures these units meet and exceed modern efficiency standards. This makes them an excellent choice for utility distributors, industrial complexes, and commercial facilities looking to minimize electrical losses and enhance grid reliability over a multi-decade lifespan.

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