The S13 Oil Immersed Transformer 10kV-35kV from Xuzhou Tuojie delivers exceptional energy efficiency for your industrial and commercial needs. Compared to older models, this modern three-phase transformer has 30% less no-load loss and an efficiency rate of over 98.5% at full load. Our S13 line has fully sealed tanks that can last 25 to 30 years and come in capacities ranging from 30KVA to 31500KVA. We make transformers that lower your costs and work reliably in harsh settings. We have over 120 sets of advanced production tools and 18 patents to back up our innovations.

You need a transformer that works hard without driving up your energy bills. Our S13 series delivers exactly that.
Your electricity costs matter. That's why we've engineered these transformers to cut no-load losses by 30% and reduce no-load current by 70-85% compared to older designs. This translates directly to lower monthly operating expenses. Over the 25-year lifespan, you'll see substantial savings that far exceed the initial investment.
Whether you're operating in extreme temperatures or high-humidity coastal environments, these transformers perform consistently. The fully sealed oil tank design prevents oil-air contact, extending service life even in challenging conditions. With IP55 protection rating and the ability to withstand 45° tilt, you get peace of mind in any installation scenario.
We've incorporated 3D oil flow circulation that keeps your transformer running cool under heavy loads. The vertical oil channels reduce winding temperatures significantly, preventing hotspots that shorten equipment life. This matters when you're running near capacity during peak demand periods.

Here's what you're getting with our S13 Oil Immersed Transformer 10kV-35kV:
| Specification | Details |
|---|---|
| Product Model | S13 Series |
| Type | Oil-immersed |
| Phase | Three Phase |
| Frequency | 50Hz / 60Hz |
| Cooling Method | ONAN / ONAF / AN / AF (optional) |
| Rated Capacity | 30KVA – 31500KVA |
| Primary Voltage | 10 / 15 / 20 / 35kV |
| Secondary Voltage | 0.22 – 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 |
| Altitude | ≤4000m |
| Ambient Temperature | -40°C ~ +40°C |
| Humidity | ≤95% |
The improved efficiency isn't just a technical specification. It means real money saved every month you operate this transformer. Combined with reduced maintenance requirements and extended lifespan, you're looking at a solution that pays for itself.
Our innovative frame design improves core clamping and short-circuit resistance. You get a transformer that handles electrical faults without catastrophic failure. The robust construction withstands up to 25 times rated current during short-circuit events.
Nobody wants a noisy transformer humming outside their facility. We've minimized operational noise through optimized core design and advanced damping techniques. Your neighbors will thank you.
Space costs money. The corrugated oil tank design reduces the footprint compared to traditional transformers with external radiators. You get more power in less space, leaving room for other critical equipment.

Running heavy machinery in steel mills, chemical plants, or mining operations? This transformer handles continuous high-load operation without breaking a sweat. It resists electromagnetic interference and mechanical vibrations common in industrial settings.
Shopping centers, office complexes, and residential developments need reliable power distribution. Our S13 transformers provide stable voltage regulation within ±2.5% from no-load to full-load conditions. Your tenants get consistent power quality.
Connecting wind farms or solar installations to the grid? The advanced magnetic circuit design handles variable load conditions and power factor variations inherent in renewable sources. You maintain grid stability even with fluctuating generation.
Utility companies choose our transformers for substations in challenging environments. The enhanced sealing and corrosion-resistant materials excel in coastal regions with high humidity and salt spray exposure.

We don't take shortcuts when it comes to quality. Every transformer undergoes rigorous testing before leaving our factory.
Your transformer passes through multiple inspection stages. We verify no-load losses, load losses, and impedance voltage through precision measurement. Insulation resistance and dielectric strength testing ensure electrical safety. Partial discharge testing confirms insulation quality below 10pC at 1.5 times rated voltage.
Our production facility operates over 120 sets of advanced machinery, including CNC automatic winding machines and microcomputer-controlled gradient curing furnaces. This equipment ensures consistency and precision in every unit we produce.
With 15 senior engineers, over 30 intermediate technicians, and 17 senior technicians, you're backed by deep technical expertise. We've solved complex power distribution challenges across hundreds of projects.

We've delivered transformers for major projects you'd recognize. The Xuzhou Rail Transit Network Control Center relies on our dual-circuit power supply designs for absolute safety. XCMG Group upgraded their factory power supply with our equipment. These aren't just installations – they're partnerships built on trust and performance.
Q: How much can I actually save on energy costs?
You'll typically see 20-30% reduction in no-load losses compared to older S11 series transformers. For a medium-sized facility running 24/7, this translates to thousands of dollars annually. The exact savings depend on your local electricity rates and load patterns.
Q: What maintenance does this transformer require?
We recommend dissolved gas analysis every 12 months and oil quality testing every 24 months. Comprehensive electrical testing should happen every 60 months. These intervals can adjust based on your loading patterns and environmental conditions.
Q: Can it handle power quality issues like harmonics?
Absolutely. The advanced magnetic circuit design accommodates non-linear loads with K-factor ratings up to K-13. This makes it suitable for modern facilities with lots of electronic equipment that generates harmonics.
Q: How long will this transformer last?
With proper loading management and preventive maintenance, expect 25-30 years of reliable operation. The fully sealed design prevents oil degradation, which is the primary factor limiting transformer lifespan.
Q: What happens if my load varies significantly throughout the day?
The enhanced voltage regulation maintains stability within ±2.5% from no-load to full-load conditions. The thermal management system handles load variations without excessive temperature swings that could shorten insulation life.
Q: Is it suitable for high-altitude installations?
Yes, our S13 transformers operate reliably at altitudes up to 4000 meters. We adjust cooling system sizing and electrical clearances for high-altitude applications where you specify this requirement.
You're not just buying a transformer. You're partnering with a company that stands behind its products.
We operate under ISO9001, ISO14001, and OHSAS 45001 management systems. Our "zero defects" quality philosophy means we catch problems before they reach your site. Every transformer is customized to meet your specific environmental conditions and electrical requirements.
Need additional electrical equipment? We assist with comprehensive procurement, providing one-stop power distribution solutions. This saves you time coordinating with multiple vendors.

Get a customized quote for your specific application. Contact us at tuojie@electricinchina.com to discuss your S13 Oil Immersed Transformer 10kV-35kV requirements.







