₹12,499.00
Maintenance-friendly hermetically sealed transformers from 50 kVA to 5000 kVA, designed with leakage-tested corrugated tanks and ONAN cooling for reliable operation in demanding environments.
Volta hermetically sealed transformers, also known as corrugated transformers, use a sealed oil-filled tank with welded corrugated fins. The fins increase the cooling surface, support heat dissipation and form an integral part of the tank structure for mechanical strength and durability.
The sealed design eliminates the conservator and silica gel breather, preventing the insulating oil from contacting atmospheric air. This limits oxidation, sludge formation, moisture ingress and oil degradation, helping deliver reliable, virtually maintenance-free operation.
| Parameter | Available Range |
| Capacity | 50 kVA to 5000 kVA |
| Voltage class | 1.1 kV, 2.2 kV, 3.3 kV, 6.6 kV, 6.9 kV, 11 kV, 12.47 kV, 13.2 kV, 13.8 kV, 15 kV, 22 kV, 25 kV, 33 kV, 34.5 kV, 66 kV and 69 kV |
| Low voltage class | 380 V, 400 V, 415 V, 433 V, 440 V, 600 V and 690 V |
| Cooling | ONAN |
| Customisation | Customised voltage classes available according to project requirements |
Minimal maintenance: The sealed design prevents contamination, removing the need for regular oil filtration or dehydrating breathers.
Extended lifespan: Isolation from atmospheric air slows the ageing of the insulating oil and supports a longer service life.
High reliability: Protection against moisture ingress and oil contamination reduces common causes of transformer failure.
Compact size: The design can be smaller than conventional transformers with comparable power ratings.
Suitable for polluted environments: The sealed tank helps protect internal components from dust and other pollutants.
Construction: Sealed oil-filled tank with welded corrugated fins and MS steel construction
Capacity: 50 kVA to 5000 kVA
Voltage class: 1.1 kV to 69 kV across the published voltage-class options
Low voltage class: 380 V, 400 V, 415 V, 433 V, 440 V, 600 V and 690 V
Cooling: ONAN
Customisation: Customised voltage classes according to project requirements
Process industries: Petrochemical, pharmaceutical, textile, plastic, oil and gas plants, and refineries.
Industrial facilities: Automobile, mining, cement, heavy, steel and manufacturing industries.
Commercial and infrastructure: Hospitals, hotels, shopping malls, high-rise buildings, commercial and residential towers, tunnel projects, construction projects and highway projects.
Power and renewable projects: Hydropower, solar, wind-power, generation and transmission projects.
Hermetically sealed transformers use corrugated fins welded into the MS steel tank to create an extended cooling surface. The corrugated construction helps dissipate heat, prevents overheating and contributes mechanical strength. Skilled welding and overpressure testing are used to verify the tank’s leakage resistance and structural integrity.
Unlike a conventional transformer, this design does not require a conservator or silica gel breather. The dielectric insulating fluid remains completely sealed from atmospheric air, limiting oxidation, sludge formation, moisture ingress and contamination. Reduced oil degradation supports long service life and minimal maintenance.
The available capacity range extends from 50 kVA to 5000 kVA. Published voltage classes range from 1.1 kV to 69 kV, with low-voltage classes of 380 V, 400 V, 415 V, 433 V, 440 V, 600 V and 690 V. ONAN cooling is specified, and customised voltage classes are available according to project requirements. Contact Bijali Bazaar with the required ratings and site conditions to identify the appropriate configuration.
Capacity: Required capacity in kVA or MVA
Voltage: Required input and output voltage
Environment: Indoor or outdoor location, pollution level and ambient conditions
Tank: Required enclosure, corrugated-fin arrangement and dimensional limitations
Insulating fluid: Required dielectric fluid specification
Cooling: ONAN cooling requirement
Load: Connected load, duty profile and future expansion allowance
Standards: Applicable technical standards and project requirements
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