200 Kva Dry Type Transformer

The 200 kVA Dry Type Transformer is frequently deployed not just for voltage step-down, but as a critical isolation barrier between the raw utility grid and sensitive electronic loads. Whether powering a specific row of CNC machines or a medical imaging wing, this unit provides galvanic isolation, helping to attenuate common-mode noise and protect downstream assets from grid-side transient spikes.

Utilizing advanced impregnation technology, this vpi dry type transformer offers a high-reliability solution for indoor environments. Unlike cast resin units that form a solid block, the VPI construction allows for slight mechanical flexibility, making the coil significantly more resistant to the thermal shock caused by frequent load cycling or intermittent motor start-ups.

As a strictly air cooled transformer dry type, the design prioritizes unrestricted airflow. The winding geometry includes precisely calculated cooling ducts between the primary and secondary coils.

 

• Mechanism: These ducts utilize the "Chimney Effect," where rising heat naturally draws cooler ambient air from the bottom, circulating it through the winding layers without the need for mechanical fans.
• Maintenance Reality: Since the cooling medium is ambient air, maintenance is straightforward. Operators only need to ensure the bottom ventilation screens are free of dust blockage. There are no dielectric fluids to degrade, eliminating the risk of soil contamination or the need for fire-suppression catch basins.

200 kVA dry transformer coils with vertical cooling ducts for

natural airflow.

Technical Parameter	Specification Data
Rated Power	200 kVA
Technology	VPI (Vacuum Pressure Impregnated)
Insulation Class	Class H (180°C)
Primary Voltage	6kV / 10kV / 400V (Isolation)
Secondary Voltage	400V / 208V / 120V
Cooling	AN (Air Natural)
Winding Material	Aluminum or Copper Conductors
Temperature Rise	120°C (Standard for Class H)
Enclosure	IP23 (Ventilated)

Automatic winding machine manufacturing coils for 200 kVA

dry type transformers.

The longevity of a VPI unit in non-climate-controlled rooms depends on its varnish. We utilize a high-grade polyesterimide varnish that is polymerized at high temperatures.

This creates a glossy, non-hydroscopic surface on the coils. Even in humid operational conditions, the vpi dry type transformer resists moisture absorption. This "seal" prevents the insulation resistance (IR value) from dropping during weekend shutdowns, ensuring the unit is safe to re-energize immediately on Monday mornings without a pre-heating cycle.

• Medical Facilities: Providing isolated 400V/230V power for MRI or CT scanners where oil units are banned due to fire risks.
• Precision Manufacturing: Localized power for robotic assembly cells that require strictly regulated voltage grounding.
• Commercial Infrastructure: Floor-level distribution in office towers where the air cooled transformer dry type design simplifies HVAC planning (heat load is predictable).

200 kVA dry type isolation transformer powering medical

MRI equipment.