Maintenance Free Safe 250kVA 11kV to 0.4kV Dry Type Distribution Transformer for Server Room Power Distribution

Engineered for the strict demands of digital infrastructure, this 250kVA 11kV to 0.4kV dry type distribution transformer provides a dedicated power step-down solution within server rooms and IT facilities. Its epoxy-resin encapsulated high-voltage coils eliminate fire and leakage risks associated with liquid-filled units, making it a truly safe choice for placing power directly near sensitive server racks, PDUs, and UPS systems. The transformer is built for continuous, uninterrupted operation, featuring a robust design that minimizes noise, withstands network harmonics, and requires virtually no maintenance over its long service life.

• True Fire-Safe and Environmental Protection: Utilizes flame-retardant, self-extinguishing epoxy-resin insulation that prevents combustion propagation. There is zero risk of oil leaks, making it code-compliant for installation inside populated buildings and directly adjacent to IT hardware.
• Ultra-Low Noise Operation: An optimized magnetic core geometry and high-quality grain-oriented silicon steel keep operating noise significantly below standard levels, ensuring a quiet environment for server rooms.
• Designed for Non-Linear and UPS Loads: The low-voltage foil-wound winding and Dyn11 vector group configuration effectively handle harmonic currents and neutral imbalances generated by modern UPS units without overheating.
• High Overload and Inrush Current Capacity: Fortified to manage the high inrush currents from server power supplies and cooling fans during simultaneous startup, maintaining voltage stability without tripping protection.
• Complete Maintenance-Free Cycle: The hermetically sealed cast coil design blocks moisture and airborne contaminants. There are no liquids to sample or moving parts to lubricate, delivering dependable service for decades with only basic visual inspections.

Addressing Critical Power Needs Through Focused Design

Server rooms and data centers present specific operating conditions that demand specialized electrical design. The high concentration of sensitive microprocessors, UPS battery banks, and precision cooling creates a need for a stable, clean, and never-failing power source. This transformer incorporates several technical measures to guarantee performance under these conditions.

• Reliable Harmonic Tolerance for UPS Systems: Modern double-conversion UPS units inject harmonic currents back into the supply. To counter this, the transformer employs a low-voltage foil winding technique which provides a large, uniform surface area. This construction significantly reduces eddy-current losses and hot spots caused by harmonic frequencies.
• Sustained Voltage Stability During Inrush Events: When multiple server power supply units (PSUs) or peripheral devices start simultaneously, the sudden current draw can cause a significant voltage dip. Our transformer is built with a reinforced core-clamping structure and generously rated conductors, providing exceptional short-term overload strength.
• Installation Proximity to Sensitive Equipment: Removing distance between the transformer and the load reduces low-voltage line losses and improves fault response. The dry type construction means the unit can be safely installed inside the server room or in an adjacent electrical closet.
• Contamination and Moisture Immunity: Precision cooling systems in data centers can create micro-climates of high humidity. The solid epoxy-resin encapsulation seals the high-voltage winding completely, providing unwavering dielectric integrity even if airborne dust or condensation is present.

A: Yes, it is specifically rated for indoor installation. The epoxy-resin insulation is fire-resistant and self-extinguishing, producing no toxic smoke. Without oil, there is no containment pit needed. It can occupy dedicated electrical rooms or secure corners of server halls with minimal clearance, providing power right where it is consumed.

A: Absolutely. It features a Dyn11 vector group and foil-type secondary winding, which is a proven design for withstanding the neutral currents and harmonic heating associated with UPS equipment. This design prevents thermal aging and allows the transformer to operate reliably within your total cost of ownership expectations.

A: The high-voltage coils are cast under vacuum in a solid resin compound. This eliminates air voids that can lead to partial discharge over time. Additionally, the transformer inherently limits fault currents and is highly resilient to short circuits, ensuring that one component short does not translate into a catastrophic fire or complete bus failure affecting your entire critical infrastructure.

A: The scheduled maintenance is minimal. There are no oil samples, gasket replacements, or pumps. We recommend an annual visual inspection to check terminal connections and a periodic dust cleaning if the unit is not inside an IP54 enclosure. The sealed coil surface can simply be wiped down.

A: The noise is remarkably low, achieved through a precision-stepped lap core and high-quality silicon steel. Under natural air cooling, it operates quietly and without any fan noise. If you opt for the AF package for enhanced overload, the fan control is temperature-activated and runs only when required, preserving the acoustic environment.

A: Yes. As a custom transformer manufacturer, we configure enclosure ingress protection, cable entry (top/bottom), and busbar orientation to ensure a seamless interface with your switchgear and busway system. We work directly with EPC projects to meet precise site specifications.