100 Kva Dry Type Transformer

For projects restricted by strict fire codes-such as populated commercial centers, hospitals, or underground infrastructure-the 100 kVA Dry Type Transformer is the standard solution to bypass the limitations of oil-filled units. By eliminating flammable liquid dielectrics entirely, this unit allows engineers to position the power source directly near the load center (even on upper floors), eliminating the cost and complexity of building fire-proof vaults or oil containment pits.

When sizing equipment, engineers often debate between specific capacities. If your project load calculation suggests a 75 kva dry type transformer, we strongly recommend upgrading to this 100 kVA model. It offers 33% more load capacity for future expansion and handles startup currents (inrush) more effectively, all while occupying virtually the same physical floor space as the smaller 75 kVA unit.

The integrity of this dry type transformer relies on a robust Vacuum Cast Resin process. We mix the epoxy resin with quartz silica flour under high vacuum conditions to create a solid, void-free insulation block around the HV windings.

 

• F1 Fire Resistance: The silica filler acts as a natural flame retardant. Practically, this means the coil is self-extinguishing. If a fire breaks out in the building, the transformer will not propagate the flame or release the thick, toxic smoke that typically hampers evacuation efforts.
• Moisture Immunity: The solid insulation completely seals the conductors. This means the unit can be energized immediately even after months of shutdown in humid environments (95% humidity), without the need for pre-drying (C2 Climatic Class).

100 kVA cast resin transformer coil with smooth void-free epoxy

insulation.

Technical Parameter	Specification Data
Rated Power	100 kVA
Primary Voltage	6kV / 10kV / 11kV
Secondary Voltage	400V / 415V
Insulation Class	Class F (155°C) or Class H (180°C)
Cooling Method	AN (Air Natural)
Enclosure Rating	IP00 (Core only) or IP20/IP23 (With Enclosure)
Sound Level	< 48 dB (Low Noise Design)
Standard	IEC 60076-11

Vacuum casting chamber for manufacturing cast resin dry type

transformers.

• Minimal O&M Burden: Unlike liquid units that require oil sampling and seal monitoring, this unit is essentially a "static" asset. Routine upkeep is drastically reduced, limited only to visual inspections and vacuuming accumulated dust from the air ducts during scheduled shutdowns.
• Acoustic Comfort: Since 100 kVA units are often installed inside occupied buildings, we use precision Step-Lap core stacking to dampen magnetostriction. The resulting noise profile is unobtrusive, often quieter than a standard office HVAC system, ensuring zero disturbance to nearby tenants.

This compact unit is typically found in:

• High-Rise Buildings: Powering elevator banks and lobby lighting where oil units are prohibited by fire codes.
• Underground Transits: Providing auxiliary power for subway lighting and ventilation fans.
• Shopping Malls: Serving as a dedicated node for specific retail zones or HVAC subsystems.

Indoor 100 kVA dry type transformer powering a high-rise

building electrical room.