MSC Transformers Hermetically sealed Transformer

The Hermetically Sealed Distribution Transformer (100 kVA to 2500 kVA, up to 33 kV) is designed as per IS 1180 (Part 1): 2014, Levels I to III. It features a fully sealed tank without a conservator, minimizing maintenance and preventing moisture ingress. Operating at 50 Hz in a three-phase Dyn11 configuration, it offers high efficiency with OCTC or OLTC options and ONAN cooling. The flexible corrugated tank accommodates oil expansion, enhancing durability. With reduced losses, eco-friendly oil options, and compact design, it’s ideal for reliable, low-maintenance power distribution.

Electrical Details :

Rated Power: 100 kVA to 2500 kVA

Phase: Three Phase

Vector Group: DDO, DYNS, YDS, YNDL, YNO, YD1, D2O, Y211

Tap Changer: OCTC or OLTC (optional)

Impedance: As per IS 1180

Efficiency: High efficiency, star-rating compliant

Losses: Up to 33 kV Class as per BIS 1180 (2014); Part 1, Level I, II, III, Amendment 4

Insulation and Cooling :

Insulation Class: Class A / F

Cooling Type: ONAN

Insulating Oil: Mineral or biodegradable (IS 335 / IEC 60296)

Cooling System: Corrugated tanks or finned radiators

Advantages

Maintenance-Free Operation

No conservator, no silica gel—sealed design ensures minimal maintenance.

Longer Oil Life

Sealed tank design minimizes oxidation, increasing oil lifespan.

Eco-Friendly

Optional use of biodegradable insulating oil for environmental safety.

Compact & Durable Design

Corrugated tanks manage thermal expansion efficiently and reduce footprint.

Hermetically sealed transformers are ideal for reliable, low-maintenance, and efficient power distribution across industrial and utility networks.