Oil type transformer 10kV 35kV options are delivered by Xuzhou Tuojie International Trade Co., Ltd. and are designed for dependable operation. Our transformers are more than 98.5% efficient at rated load, and they lose 20 to 30 percent less power when they're not in use than regular transformers. These units are made with premium mineral shielding oil (breakdown voltage >60kV) and high-quality cold-rolled grain-oriented silicon steel cores. They can handle overloads of up to 120% for two hours without breaking. Our voltage converters cover a range of 18 patents and over 120 sets of high-tech equipment, and they can handle loads from 30KVA to 31500KVA.

You get transformers designed by 15 senior engineers and over 30 intermediate technicians. Every unit undergoes rigorous testing in our professional quality inspection laboratory. We've successfully completed hundreds of key projects including Xuzhou Rail Transit Network Control Center and XCMG Group factory power supply upgrades.
Our transformers utilize latest low-loss copper windings combined with enhanced insulation systems. The mineral oil provides dielectric strength of 30-50kV, far exceeding air's 3kV/mm capability. This enables compact construction while maintaining safety margins your operations demand.
Operating temperature range spans -40°C to +40°C ambient conditions. The oil circulation system ensures optimal thermal management with temperature rise limited to 60K for oil and 65K for windings. You can deploy these units at altitudes up to 4000m without performance degradation.
Your peace of mind comes from our ISO9001, ISO14001, and OHSAS 45001 certifications. All products hold National CCC Mandatory Certification. Design compliance covers IEC60076, IEEE, GB, ANSI, and CSA standards.

| Parameter | Specification |
|---|---|
| Product Model | S9 / S11 / S13 Series |
| Type | Oil-immersed |
| Phase | Three Phase |
| Frequency | 50Hz / 60Hz |
| Cooling Method | ONAN / ONAF / AN / AF (optional) |
| Rated Capacity | 30KVA – 31500KVA |
| Primary Voltage | 10kV / 15kV / 20kV / 35kV |
| Secondary Voltage | 0.22kV – 1.14kV |
| Vector Group | Dyn11 / Yyn0 / Yd11 (optional) |
| Insulation Class | F / H (optional) |
| Winding Material | Copper / Aluminum |
| Core Material | Grain-oriented Silicon Steel |
| Design Standard | IEC60076 / ANSI / IEEE / GB / CSA |
| Certifications | ISO9001, ISO14001, OHSAS 45001, CCC |
| Operating Altitude | ≤4000m |
| Ambient Temperature | -40°C ~ +40°C |
| Relative Humidity | ≤95% |
| Protection Rating | IP23 – IP54 |
| Efficiency | >98.5% at rated load |
You benefit from lower initial investment and reduced operating costs. Our transformers deliver superior total cost of ownership compared to dry-type alternatives. The predictable maintenance schedule helps you plan budgets effectively.
Strong overload capacity protects your equipment during peak demand periods. The design life expectancy reaches 30 years under normal operating conditions. You get reliable outdoor performance suitable for substations, industrial facilities, and renewable energy installations.
Our Oil type transformer 10kV 35kV units scale from small distribution applications to ultra-high capacity installations. Whether you need 100KVA for a commercial building or 10MVA for an industrial complex, we provide tailored solutions.
Predictive maintenance capabilities minimize unexpected downtime. Our mature fault diagnosis system helps you identify issues before they become critical. The oil's chemical properties—moisture content below 10ppm and acid value less than 0.01mgKOH/g—ensure long-term stability.
We incorporate eco-friendly insulating fluids that enhance safety and environmental performance. Our 18 patents demonstrate ongoing commitment to technological advancement. You get next-generation solutions that meet evolving industry standards.

We operate CNC automatic winding machines, CNC static vacuum casting machines, automatic foil winding machines, and microcomputer-controlled gradient curing furnaces. This automation ensures consistent quality across every unit.
Your order undergoes comprehensive monitoring at every stage:
No unqualified product leaves our factory. This commitment aligns with ISO9001 quality management system standards.
You receive transformers configured for your specific voltage levels, capacity requirements, and environmental conditions. We accommodate diverse country-specific requirements and regional standards. Our technical team collaborates with you to design optimal solutions.

Rail transit systems benefit from our dual-circuit power supply designs ensuring absolute safety. High-speed railway stations, hospitals, and public facilities rely on uninterrupted power delivery.
Shopping complexes, entertainment venues, and residential developments require reliable voltage transformation. Our projects include Xuzhou Fantawild Adventure and multiple commercial real estate developments.
Manufacturing facilities demand robust fault current handling capabilities. We've supplied product units to XCMG Group, GCL Photovoltaic Industrial Park, and Huaihai Biomedical Industrial Park—all completed ahead of schedule.
Photovoltaic installations and wind farms need transformers that handle variable loads efficiently. Our units provide the reliability renewable energy projects demand.

Q: What makes oil-immersed transformers better than dry-type for outdoor applications?
A: Designs that are soaked in oil offer better thermal control and longer operating life in harsh settings. The mineral oil has great insulating qualities and can put out fires on its own. When you put something outside, you get better extra capacity and less upkeep.
Q: How do I determine the right capacity for my application?
A: Figure out your total linked load and use the right demand factors. Take into account the need for future growth and times of high demand. Our expert team can look over your requirements and suggest the best potential size. Send us your load profile and we'll give you specific advice.
Q: What maintenance schedule should I follow?
A: Do eye checks once a month to look for oil leaks and strange sounds. Every year, check the quality of the oil by measuring the moisture level and breakdown voltage. Every three to five years, you should plan for full repair, which should include checking the insulation and winding resistance. With every package, we include full instructions on how to take care of it.
Q: Can these transformers operate at high altitudes?
A: Yes, our units function reliably up to 4000m altitude. Higher elevations may require derating or special cooling considerations. Consult our engineers for installations above 4000m to ensure proper specifications.
Q: What certifications do your transformers carry?
A: All products meet ISO9001 quality standards, ISO14001 environmental standards, and OHSAS 45001 safety standards. We hold National CCC Mandatory Certification. Design compliance includes IEC60076, IEEE C57 series, GB/T 6451, and ANSI standards depending on your market requirements.
Q: How quickly can you deliver custom configurations?
A: Standard models ship within 4-6 weeks. Custom configurations require 8-12 weeks depending on specifications. We've demonstrated ability to complete projects ahead of schedule while maintaining quality standards. Contact us for specific timeline estimates.
Q: Do you provide installation support?
A: Yes, we offer comprehensive installation guidance and can arrange technical support for complex projects. Our quality management extends through installation and commissioning phases. You receive complete documentation and training for your maintenance teams.
You partner with a company backed by over 20 years of industry experience. Our philosophy—technology first, service paramount, and integrity fundamental—guides every interaction. We prioritize your interests through pragmatic, innovative solutions.
The strong technical team brings deep expertise to your project. From initial consultation through installation and ongoing support, you receive attentive service. We assist with additional product procurement, providing comprehensive electrical solutions beyond transformers alone.

Ready to discuss your power distribution needs? Our team stands ready to provide tailored Oil type transformer 10kV 35kV solutions. Email us at tuojie@electricinchina.com for expert consultation.







