Modern Efficiency & Capacity Standards
The 315 kVA Dry Type Transformer is the current IEC-standard capacity for medium-sized indoor distribution - and the direct upgrade path for any project still specifying a legacy 300 kva dry type transformer on the single-line diagram.
- Complies with Eco-design Tier 1 / Tier 2 efficiency requirements (lower no-load core loss)
- Provides approx. 5% extra capacity margin over the legacy 300kVA rating
- Matches standard 630A ACB breaker ratings - no re-engineering of downstream protection needed
Substation Integration Logic
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.
Air Insulated Technology (Class H)
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 Data Sheet
| Parameter | Value |
|---|---|
|
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) |
| Primary Voltage | 10kV (standard, up to 35kV custom) |
| No-load Loss | 280 W |
| Load Loss (120°C) | 3290 W |
| No-load Current | 0.9% |
| Noise Level | 59 dB(A) |
| Total Weight | 2120 kg |
| Dimension (IP00) | 1400 × 1150 × 1480 mm |
| Dimension (IP20) | 1800 × 1200 × 1620 mm |
| Track Spacing | 660 × 1070 mm |
Typical Application Context
- 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.
Testing & Quality Assurance
Every 315kVA dry type transformer is manufactured under a strict quality management system and undergoes comprehensive factory testing before shipment. From raw material inspection to final electrical performance verification, each production stage is carefully controlled to ensure consistent quality, safety, and long-term reliability.
Our engineering team performs routine tests in accordance with IEC 60076-11, while additional type tests or special tests can be arranged upon customer request. Detailed test reports are available for every transformer delivered.
Standard Factory Tests
Each transformer is subjected to a complete series of routine inspections, including:
Visual inspection and dimensional verification
Winding resistance measurement
Voltage ratio and vector group verification
No-load loss and excitation current test
Load loss and short-circuit impedance test
Applied voltage withstand test
Induced over-voltage test
Insulation resistance measurement
Partial discharge test (when specified)
Temperature sensor functional inspection
Final operational and nameplate verification
All electrical parameters are checked to ensure compliance with the approved technical specification before shipment.
Optional Type Tests
For projects requiring additional validation, the following tests can also be provided:
Temperature rise test
Lightning impulse withstand test
Short-circuit withstand verification
Sound level measurement
Seismic performance verification
Protection degree (IP) verification
Every transformer is supplied with a factory test report, quality inspection records, and product documentation to support installation, commissioning, and project acceptance.
Packaging & Shipping
To ensure that every 315kVA cast resin dry type transformer arrives at the installation site in perfect condition, we apply export-grade packaging and handling procedures designed for international transportation.
Before packing, each transformer undergoes a final appearance inspection. All accessories, mounting hardware, technical documents, and optional components are checked and packed together to prevent loss during transit.
Export Packaging
Depending on customer requirements and transportation methods, the transformer can be packed using:
Heavy-duty wooden crates for full protection
Steel pallet or steel skid packaging
Fumigation-free plywood cases for export
Moisture-proof wrapping with protective film
Shock-resistant internal fixing for safe transportation
Additional corrosion protection can be applied for long-distance sea freight or tropical climates.
Safe Transportation
Each transformer is securely fastened to prevent movement during loading, unloading, and ocean transportation. Lifting points and center-of-gravity markings are clearly identified to facilitate safe handling by cranes and forklifts.
Shipping methods include:
Ocean freight (FCL/LCL)
Railway transportation
Road transportation
Air freight for urgent projects (where applicable)
Before delivery, every package is clearly labeled with product information, model number, serial number, gross weight, lifting instructions, and destination markings to simplify logistics management and on-site installation.
Our logistics team works closely with international freight forwarders to ensure timely delivery and safe arrival for projects worldwide.
FAQ
Q: What applications is a 315kVA dry type transformer suitable for?
A: A 315kVA dry type transformer is widely used in commercial buildings, manufacturing plants, hospitals, schools, shopping malls, data centers, renewable energy projects, airports, and utility distribution systems. Thanks to its oil-free cast resin insulation, it is particularly suitable for indoor installations where fire safety, environmental protection, and low maintenance are important.
Q: Can the voltage and specifications be customized?
A: Yes. We provide customized solutions based on your project requirements. Primary and secondary voltages, frequency (50Hz or 60Hz), vector group, impedance voltage, enclosure protection level (IP23, IP54, IP55), temperature rise, cooling method, and winding material (copper or aluminum) can all be tailored to match your application.
Q: What international standards does your 315kVA dry type transformer comply with?
A: Our transformers are designed and manufactured in accordance with internationally recognized standards such as IEC 60076-11. Upon request, products can also be manufactured to comply with UL 1561, IEEE, or other project-specific technical specifications. Every transformer undergoes routine factory testing before shipment to ensure reliable performance and quality.
Q: What is the difference between a dry type transformer and an oil immersed transformer?
A: A dry type transformer uses epoxy resin insulation instead of insulating oil, eliminating the risk of oil leakage and significantly reducing fire hazards. It requires less maintenance and is ideal for indoor environments, while oil immersed transformers are generally preferred for higher-capacity outdoor distribution applications. The best choice depends on the installation environment, maintenance requirements, and project budget.
Q: What information should I provide when requesting a quotation?
A: To recommend the most suitable transformer, please provide the transformer capacity, primary voltage, secondary voltage, frequency, installation location (indoor or outdoor), cooling method, enclosure protection level, applicable standards, and any special project requirements. Our engineering team will prepare a customized technical proposal and quotation based on your specifications.
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