315 Kva Dry Type Transformer

The 315 kVA Dry Type Transformer represents the current benchmark for medium-capacity indoor distribution, aligned with the IEC 60076 R10 preferred number series. It is engineered to deliver superior energy efficiency, complying with modern Eco-design regulations (Tier 1 / Tier 2) to minimize no-load core losses during off-peak hours.

For projects where the single-line diagram specifies a legacy 300 kva dry type transformer, this 315 kVA unit serves as the superior technical alternative. It not only covers the required load but provides a 5% extra capacity margin. This aligns better with modern standard circuit breaker ratings (e.g., 630A ACB), optimizing the protection coordination curve.

Designed specifically as a versatile dry type substation transformer, this unit is often the "heart" of prefabricated compact substations (CSS) or indoor electrical rooms.

 

• No Oil Containment Needed: Unlike liquid-filled units that require complex concrete catch basins to contain potential spills, this dry unit can be installed directly on a simple flat floor. This simplifies the civil engineering requirements for the substation significantly.

 

• Close-Coupling: The terminal layout is optimized for direct coupling with Low Voltage (LV) distribution boards or Medium Voltage (MV) ring main units, reducing cabling complexity and saving valuable floor space in tight utility rooms.

315 kVA dry transformer low voltage busbar terminals for easy

substation coupling.

This unit operates as an open-ventilated air insulated dry type transformer. We utilize high-grade Nomex® or Aramid paper insulation, which is vacuum-pressure impregnated (VPI) with high-temperature varnish.

• Thermal Endurance: This insulation system is rated for Class H (180°C) operation. It can withstand significant thermal spikes without degrading, offering a high overload capability during peak demand windows.

• Maintenance Visibility: The "open coil" design allows maintenance teams to visually inspect the windings for dust accumulation or obstruction during routine shutdowns-something impossible with solid cast resin blocks.

Technical Parameter	Specification Data
Rated Power	315 kVA (IEC Standard)
Legacy Compatibility	Replaces 300 kVA units
Primary Voltage	10kV / 11kV / 6.6kV
Secondary Voltage	400V / 415V
Insulation Class	Class H (180°C)
Cooling Method	AN (Air Natural)
Impedance Voltage	4.0% (Standard)
Efficiency Standard	Eco-design Tier 2 (Low Loss)

Stacking silicon steel laminations for low-loss eco-design dry

type transformer cores.

• Commercial Basements: Installed in the main utility room of office towers where fire codes prohibit oil transformers.
• Package Substations (CSS): Integrated into outdoor metal kiosks for supplying power to residential estates or EV charging hubs.
• Light Industrial Retrofits: Replacing aging 300 kva dry type transformer units to improve site energy efficiency ratings.

315 kVA dry type transformer integrated into an outdoor

prefabricated compact substation.