Hermetically Sealed Transformer

Fully sealed, maintenance-free oil transformers - the perfect solution for remote, harsh, and coastal environments.

Hermetically Sealed Transformer

ABC Hermetically Sealed Transformers

ABC Hermetically Sealed Transformers are highly specialized power and distribution units manufactured by ABC Transformers Pvt. Ltd. (India). Unlike conventional designs, these transformers are entirely sealed from the external atmosphere - preventing air and moisture from contaminating the internal insulating oil and rendering the system virtually maintenance-free.

The range covers power ratings from 100 kVA to 2.5 MVA and higher, with voltages up to 36 kV and common ratios of 11 kV/433 V and 33 kV/433 V. These units comply with IEC 60076 and are ideal for solar/wind energy systems, industrial plants, refineries, and remote unmanned substations.

Key Specifications

Power Rating100 kVA – 2.5 MVA & higher
VoltageUp to 36 kV
Common Ratios11 kV/433 V · 33 kV/433 V
CoolingONAN / KNAN
StandardIEC 60076
Life Expectancy25–30 years
MaintenanceAlmost none required

Sealed vs. Conservator Type - Comparison

Feature Hermetically Sealed Conservator Type
Atmospheric Contact ✔ Zero contact Contact through a breather
Maintenance ✔ Almost none required Requires oil testing & breather maintenance
Expansion System ✔ Corrugated fins or gas cushion External conservator tank
Life Expectancy ✔ Typically 25–30 years Dependent on regular maintenance

Key Operational Advantages

🔒 Maintenance-Free Lifecycle

Complete isolation from external air prevents oil oxidation and sludge formation - eliminating the need for routine oil testing, purification, and silica gel breather maintenance.

🌡️ Harsh Environment Durability

Engineered to survive severe conditions - providing complete internal protection in coastal, desert, or industrial areas prone to high humidity, salt mist, and corrosive chemicals.

📐 Compact Physical Footprint

The omission of a separate conservator tank reduces unit dimensions, making it ideal for tight spatial installations and compact substations.

⚙️ Advanced Expansion Design

Employs flexible corrugated tank walls or an inert Nitrogen gas cushion to smoothly absorb the natural expansion and contraction of insulating oil during temperature cycles.

Typical Applications

▸Solar & Wind Energy Systems
▸Industrial Plants
▸Oil Refineries
▸Remote Unmanned Substations
▸Coastal & Desert Environments
▸Compact Substations

Enquire About Hermetically Sealed Transformers

Tell us your site conditions and rating requirements - we'll find the perfect sealed unit.

Get a Quote