35kV Oil-immersed Three-phase Doubl- winding Non-excited Voltage Regulation Distribution Transformer Parameters |
Rated Power (kVA) | Vector group | Efficiency Level 1 | Efficiency Level 2 | Efficiency Level 3 | Short Circuit Resistance% |
No-load Loss (kW) | On-load Loss (75℃ kW) | No-load Loss (kW) | On-load Loss (75℃ kW) | No-load Loss (kW) | On-load Loss (75℃ kW) |
3150 | YNd11 | 1.7 | 20.7 | 2.0 | 20.7 | 2.4 | 21.9 | 7 |
4000 | 2.0 | 24.6 | 2.3 | 24.6 | 2.9 | 25.9 |
5000 | 2.4 | 28.2 | 2.8 | 28.2 | 3.5 | 29.7 |
6300 | 2.9 | 31.5 | 3.4 | 31.5 | 4.2 | 33.3 | 8 |
8000 | 4.0 | 34.6 | 4.7 | 34.6 | 5.8 | 36.5 |
10000 | 4.8 | 40.8 | 5.7 | 40.8 | 7.0 | 43.0 |
12500 | 5.5 | 48.4 | 6.5 | 48.4 | 8.0 | 51.1 |
16000 | 6.7 | 59.2 | 7.9 | 59.2 | 9.7 | 62.5 |
20000 | 7.9 | 71.6 | 9.4 | 71.6 | 11.5 | 75.5 |
25000 | 9.4 | 84.6 | 11.1 | 84.6 | 13.6 | 89.3 | 10 |
31500 | 11.1 | 100.8 | 13.1 | 100.8 | 16.2 | 106.4 |
Product Advantages
● Energy Efficiency
The 35kV oil-immersed transformer incorporates advanced energy-saving technology, effectively reducing energy consumption and improving efficiency. The core is constructed from high-quality cold-rolled silicon steel sheets, characterized by low loss, low noise, and high efficiency.
● Low Noise
Utilizing high-quality windings and high-performance materials, the transformer operates with minimal noise. Its robust insulation system and reliable structural design ensure stable long-term operation, further reducing possibility of generating noise.
●High Reliability
The core is made from specially treated, low-loss, low-noise steel, providing excellent corrosion and heat resistance. This allows for reliable operation under harsh environmental conditions. High-quality materials and precise manufacturing ensure the transformer's reliability and longevity.
● Ease of Maintenance
The transformer's design facilitates easy maintenance and repair. An automatic protection system automatically disconnects the power supply in case of faults, preventing potential short circuits and fires caused by damaged components. Simple operations allow maintenance personnel to efficiently service the transformer, enhancing its usability.
Product Characteristics
● The transformer core is made of high magnetic conductivity, grain-oriented cold-rolled silicon steel sheets, ensuring low no-load loss.
● The three-phase windings use concentric coils with corrugated oil ducts. A non-dipping paint process and tight band binding enhance mechanical strength, ensure balanced ampere-turn distribution, and provide excellent short-circuit resistance.
● To prevent displacement during transportation, a positioning structure is added to the core assembly. All fasteners are secured with locking nuts to avoid loosening during long-term operation.
● The transformer adopts a fully sealed design. Vacuum oil filling completely removes internal moisture, isolates the oil from ambient air, prevents oil aging, and improves operational reliability. Pressure relief valves are installed across all capacity sections, and optional gas relays with alarm and trip functions are available for enhanced safety.
● A corrugated oil tank design offers simple manufacturing, high strength, excellent welding performance, and no leakage. The strong oil fluidity also improves heat dissipation.
● Compact, aesthetically pleasing, and space-saving, this transformer is an ideal maintenance-free solution.
Typical Applications
● Utility & Substation Distribution – Heavy-duty service for 35 kV grid distribution.
● Industrial & Mining Facilities – Ideal for onsite 35 kV to low-voltage stepping in industrial loads.
● Renewable Energy Integration – Supports wind farms or solar parks with stable power delivery.
● Urban Infrastructure Projects – Underground or pad-mounted installations for city/regional distribution.
● Oil & Gas or Petrochemical Sites – Delivers robust performance in harsh, high-integration environments.
Why Choose Tianya Electric?
Rich Manufacturing Legacy
Operating since 2007 with a full end-to-end production setup and 6,000 m² facility.
Strict Quality Governance
Multi-stage QC—from supplier approval to pre-shipment testing—ensures 100% defect-free deliveries.
Deep Technical Expertise
A team of 30+ seasoned engineers deliver tailored engineering, site support, and seamless product integration.
Comprehensive Manufacturing Process
In‑house iron core, coils, oil tanks, assembly, vacuum-drying, testing, and packaging—all under one roof for maximal control.
Lifetime Support & After‑Sales
24/7 customer service, technical assistance, rapid spares, renovation, and maintenance available internationally.
Company Services
Custom Solution Design – Voltage, power ratings, cooling methods, accessories, oil types tailored per project.
Technical & Project Consulting – EMC assessments, tap changer planning, loading optimization.
Factory Acceptance Tests – Witnessed dry and wet tests to international ANSI/IEC standards.
International Logistics & Support – Global delivery, customs clearance, and on-site commissioning.
After‑Sales Maintenance – Spare parts supply, oil analysis, refurbishment, and comprehensive troubleshooting.