Product Details

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.