Global Procurement Guide for 315 Kva-22/0.4kv Three phase Oil immersed Transformers
Feb 04, 2026
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In worldwide power distribution projects, the 315 kVA-22/0.4kV three phase oil immersed transformer is one of the most specified medium-capacity distribution transformers due to its reliability, energy efficiency, and adaptability across industrial and commercial grids.
As a factory-level transformer manufacturer since 2008, GNEE provides global suppliers, EPC contractors, and end users with actionable procurement strategies, technical compliance analysis, and supplier selection guidance - all focused on optimizing cost, quality, delivery, and service.
In this guide, you'll learn how to qualify suppliers, evaluate technical specifications, mitigate risks in global sourcing, and ensure the transformers delivered meet performance expectations and international standards.
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Transformer Specifications
| Manufacturer | GNEE ELECTRIC |
| Standard on which performance data is based | NF EN; EN 61558-2:2015/2014/548/EC-ecodesign- Tier2 |
| Type | OIL IMMERSED |
| Method of Cooling | ONAN |
| Rated Power | 315 KVA |
| Voltage Ratio | 22kv |
| Frequency | 50/60HZ |
| Tap Changer | 5 |
| HV-Tapping | ±2.5%;±5% |
| Vector Group | Dyn11 or Yyn0 |
| Core Material | CRGO Steel |
| Winding Material | Aluminium or Copper |
| No Load Losses (GB/T S13 series) | 480w |
| Load Losses (GB/T S13 series) | 5150w |
Supplier Qualification for 315 kVA-22/0.4kV Oil Immersed Transformer Procurement
Selecting the right supplier is the first critical step in any global procurement process for 315 kVA-22/0.4kV three phase oil immersed transformers. Buyers must validate manufacturer capabilities, quality systems, compliance, and logistics support.
Core Supplier Qualification Criteria
- Manufacturing Credentials: ISO certifications, transformer output capacity, test lab capabilities, and experience with large-scale transformer orders.
- Product Compliance: IEC, IEEE, ANSI, or regional standards compliance for ratings, insulation, temperature rise, and safety.
- Quality Assurance: Presence of routine and type testing, factory acceptance tests (FAT), and traceability documentation.
- Supply Chain & Logistics: Export packaging, lead times, shipping routes, and after-sales support.
Global sourcing often involves long transit times, so manufacturers with export packaging experience and seasoned logistics planning are valuable partners.
The core advantages of a 315KVA transformer
1. Standards: GB, IEC, GOST, EN, NF, ANSI/IEEE (customizable according to customer standards)
2. Certification: ISO,CE,IEC,SABS,COC,CSA,UL
3. Efficiency: The efficiency of a 315 kva transformer is greater than 99%, which can meet the European 2015/2014/548/EC ecodesign Tier 2 energy efficiency regulations.
4. Maintenance free: IP65 protection level, dustproof and moisture-proof, maintenance free, designed for a lifespan of over 25 years.
5. Environmental protection and sustainable development: FR3 vegetable oil can be selected.
6. Overload capacity: Copper coil 315 kva transformer allows short-term overload to 150% of rated capacity for no more than 2 hours, but requires monitoring of oil temperature (≤ 95 ℃).
Price of 315KVA Transformer
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Shipping, Packaging & Logistics for Global Delivery
For global procurement, shipping and packaging quality are as important as electrical performance. Oil immersed transformers require safe packaging to protect against mechanical damage, moisture, and sea/land transit conditions.
Shipping, Packaging & Logistics for Global Delivery
Key Logistics Tips
- Export Wooden Crates / Film Protection - ensure dense padding and internal bracing.
- Moisture-Barrier Bags & Silica Gel - prevent humidity ingress during long voyages.
- Clear Customs Documentation - HS codes, certificates of origin, test certificates, and warranties.
Choosing a supplier experienced in global delivery significantly reduces customs clearance issues and avoids costly delays.
Conclusion: Successfully Procure the Right 315 kVA-22/0.4kV Oil Immersed Transformer
The global procurement process for 315 kVA-22/0.4kV three phase oil immersed transformers demands careful planning, technical clarity, supplier evaluation, and logistics preparedness.
By following this guide and choosing a seasoned manufacturer like GNEE, you can secure premium quality units, optimized pricing, and reliable global delivery.
Frequently Asked Questions (FAQ) for 315KVA Transformers
What are the typical application scenarios of 315 kva three-phase oil immersed transformers?
*Power distribution for small and medium-sized factories;
*Electricity supply for commercial buildings, hospitals, or schools;
*Voltage conversion of rural power grids or community distribution systems;
*Power distribution at temporary construction sites.
What are the common configurations for its rated input/output voltage?
*High voltage side: 22kV (domestic distribution standard);
*Low voltage side: 400V (three-phase four wire system, line voltage 400V/phase voltage 230V);
How to calculate its rated current?
*High voltage side: I=315kva/22kV/√3=8.27A
*Low voltage side: I=315kva/0.4kV/√3=454.67A
What are the requirements for the surrounding environment during installation?
*Good ventilation, keep away from flammable and explosive materials;
*The basic platform needs to be level and load-bearing (with an oil content of about 200kg);
*Reserved heat dissipation space (with a side distance of ≥ 0.8 meters from the wall and no obstruction at the top);
*Outdoor installation requires the installation of rain covers or fences.
What is the overload capacity of a 315 kva transformer?
*Short term overload (such as within 2 hours) can reach 150% load (copper coil);
*Long term overload will accelerate insulation aging, and it is necessary to avoid operating beyond the rated capacity.
What are the key points to pay attention to in daily maintenance?
*Oil level check: The oil gauge of the oil pillow should be within the marked range;
*Oil temperature monitoring: During normal operation, the top oil temperature is ≤ 65 ° C;
*Leakage inspection: Check for oil leakage in the fuel tank welds and gaskets;
*Regular tests: insulation oil withstand voltage test, winding DC resistance measurement (once a year).
How to determine whether insulation oil needs to be replaced?
*Breakdown voltage: below 30kV (new oil standard ≥ 35kV);
*Excessive acid value:> 0.1mg KOH/g;
*High moisture content:> 20ppm;
*Oil color dark black or with carbide particles (needs to be filtered or oil changed).
Possible causes and solutions for abnormal temperature rise?
*Reason: Overload, blocked radiator, oil circulation failure, internal winding short circuit;
*Solution: Immediately reduce the load and check the load; Clean the heat sink or repair the cooling system; Suspend maintenance for internal faults.
What protective devices must be configured?
*High voltage side: drop out fuse or circuit breaker (overcurrent protection);
*Low voltage side: air switch (short circuit protection);
*Body protection: gas relay, pressure relief valve, thermometer;
*System protection: lightning arrester (lightning protection), grounding device (grounding resistance ≤ 4 Ω).
How to choose energy efficiency level when purchasing?
*Standard: According to local national energy efficiency regulations or customer requirements