The SZ11-200–2500/10 series consists of 10 kV three-phase, double-winding, oil-immersed on-load tap-changing distribution transformers. As a high-performance oil filled distribution transformers, the “S” in the model denotes three-phase, ‘Z’ denotes on-load tap-changing, and “11” represents the performance level code. The rated capacity ranges from 200 to 2500 kVA. It is designed to meet the voltage stabilization and efficient power distribution needs of power grids, industrial and mining facilities, and infrastructure projects.
| Rated0 Capacity (KVA) | Voltage Combination | Conn- ection Label | No- Load Loss (W) | Load Loss- es (W) | Short Circuit Impe- dance (%) | No- Load Current (A) | Lpa Noise Level dB) | Weight | Overall Dimension | Rail Cauge (mm) | ||||
| H.V. (KV) | High Voltage Tap Range (%) | L.V. (KV) | Core | Oil | Total | L×W×H | ||||||||
| 200 | 6 6.3 10 10.5 11 | ±4 ×2.5% | 0.4 | Yyn0 or Dyn11 | 385 | 2910 | 4 | 0.9 | 44 | 590 | 230 | 1000 | 1700×750×1200 | 450x600 |
| 250 | 450 | 3420 | 0.9 | 44 | 720 | 270 | 1200 | 1750×770×1250 | 500x700 | |||||
| 315 | 540 | 4100 | 0.8 | 46 | 810 | 300 | 1350 | 1800×790×1300 | 550x550 | |||||
| 400 | 640 | 4960 | 0.7 | 46 | 950 | 330 | 1550 | 1850×810×1350 | 550x800 | |||||
| 500 | 770 | 5900 | 0.7 | 48 | 1220 | 380 | 1850 | 1900×830×1400 | 600x800 | |||||
| 630 | 960 | 7270 | 4.5 | 0.65 | 48 | 1320 | 400 | 1950 | 1950×850×1450 | 600x800 | ||||
| 800 | 1120 | 8890 | 0.6 | 50 | 1500 | 460 | 2150 | 2000×870×1500 | 660x950 | |||||
| 1000 | 1360 | 10430 | 0.55 | 50 | 1670 | 530 | 2550 | 2050×890×1550 | 610x950 | |||||
| 1250 | 1560 | 12400 | 0.5 | 51 | 2020 | 580 | 3050 | 2100×910×1600 | 750x950 | |||||
| 1600 | 1920 | 14800 | 0.5 | 51 | 2380 | 660 | 3600 | 2150×930×1650 | 750x950 | |||||
| 2000 | 2020 | 17820 | 5.5 | 0.5 | 52 | 2880 | 710 | 4250 | 2250×990×1750 | 800x1050 | ||||
| 2500 | 2380 | 20700 | 0.5 | 54 | 3280 | 780 | 4900 | 2300×1050×1800 | 1070x1707 | |||||
As a high-quality oil-immersed transformer, this product features a fully staggered-step core with high-permeability cold-rolled silicon steel sheets, which optimizes the magnetic circuit distribution. No-load losses are reduced by approximately 20% compared to traditional oil-immersed transformers, with a corresponding decrease in no-load current. The high-voltage windings use oxygen-free copper electromagnetic wire, which features low resistivity and excellent conductivity. Combined with a new core insulation structure, this reduces load losses by over 10%, significantly lowering long-term energy consumption and delivering the core advantage of low operating costs. Long-term use can result in substantial savings on electricity bills.
As an oil immersed power transformer, this product features comprehensive safety upgrades. It is equipped with a 9-tap on-load tap changer, with a high-voltage tap range covering ±3×2.5% (suitable for 10kV grid fluctuation scenarios). Voltage can be adjusted manually, electrically, or automatically under load, ensuring the output voltage remains stable within the qualified range. This prevents equipment failures caused by voltage fluctuations, comprehensively safeguarding electrical safety, and perfectly addressing various scenarios with significant voltage fluctuations and frequent load changes.
This low losses transformer features a fully sealed corrugated tank design that completely isolates the insulating oil from the air, eliminating leakage and effectively extending the equipment’s service life. This achieves the core feature of maintenance-free operation, significantly reducing operational labor and material costs; The core employs a plate-pulling structure combined with end-face adhesive curing of silicon steel sheets, forming an integrated rigid structure. Coupled with high-strength clamps and support beams, this significantly enhances short-circuit resistance. The body and tank are supported by laminated wood, providing strong resistance to impact during both transportation and operation. Installation and commissioning can be performed without lifting the core for maintenance, further reinforcing the maintenance-free advantage while ensuring long-term safe and stable operation of the equipment.
This product fully complies with all relevant standards and is suitable for both indoor and outdoor installation. It features low noise and stable heat dissipation. As a low-loss, low-operating-cost, maintenance-free three phase oil immersed transformer, it is suitable for a wide range of applications and offers outstanding value for money.
Nanjing South Railway Station
As a critical control project within the Beijing–Shanghai High-Speed Railway—a strategic national priority—Nanjing South Station exerts a positive and profound influence on the development of China's transportation sector, the enhancement of the city's image, and the improvement of the living and working conditions of its people.
Beijing-Tianjin-Hebei Data Center
Tiantong Enterprise possesses the capability to install 220kV power transmission and transformation equipment, and maintains a service system backed by proprietary intellectual property rights. The company provides installation, operation, commissioning, and maintenance services for complete sets of power equipment and their associated accessories, demonstrating strong competitiveness within the fields of power installation and maintenance.
Oil-immersed transformers are utilized in a wide variety of scenarios—including 35kV main step-down substations, step-up stations for wind and solar energy projects, power supply systems for large industrial plants and mines, urban high-voltage distribution networks, port and mining power systems, heavy-load centers in the metallurgical and chemical industries, and electrified railway hubs—to facilitate efficient medium-to-high voltage conversion and ensure stable power station operation with minimal electromagnetic interference.
Power and New Energy Industries
Industrial Manufacturers
Infrastructure and Municipal Sectors
Mining, Oil, and Gas Industries
Tiantong Enterprise was established in 1993 and is headquartered in the Sujiatun District of Shenyang City, covering an area of 135,000 square meters. The company possesses three production bases, fixed assets exceeding 300 million RMB, and over 100 pieces of specialized production equipment, demonstrating substantial strength. Exports account for 20% of its annual sales, with products shipped to numerous countries, including Saudi Arabia, Iraq, Kazakhstan, Uzbekistan, Russia, Indonesia, Vietnam, and Nigeria.
Tiantong Industrial Oil-Immersed Transformers have been selected by numerous leading enterprises in China, including State Grid, PetroChina, Sinopec, Sinohydro, Wanda Group, Vanke, China Resources Land, and Poly Developments. These partnerships reflect our proven product reliability, strict quality standards, and ability to support demanding power distribution projects across utility, industrial, commercial, and infrastructure sectors.
Every Tiantong oil-immersed transformer undergoes strict quality inspections throughout production, from silicon steel core verification and winding assembly to tank fabrication and final testing. Before shipment, each unit is tested for insulation resistance, turns ratio, winding resistance, no-load loss, load loss, impedance voltage, and dielectric withstand performance. Oil quality, sealing integrity, and protection device operation are also verified to ensure safe, reliable, and long-term operation in demanding power distribution applications.
To ensure the safe arrival of the 35kV oil-immersed transformer at the project site, a specialized export packaging scheme is employed; critical components—such as bushings, radiators, and control devices—undergo treatments to protect against shock, moisture, and corrosion. Transport may be conducted with the unit either oil-filled or under nitrogen protection, and the equipment is secured to a robust steel base fitted with rigid support structures.
We facilitate sea, land, and multimodal transport, offering logistics services under FOB, CIF, and Door-to-Door terms. Furthermore, we provide assistance with export documentation, transport insurance, customs clearance procedures, and on-site installation guidance.
We support customized parameter adjustments (such as special voltage combinations and upgraded protection ratings) and provide end-to-end technical support (including product selection consultation, installation guidance, and operation and maintenance training); Strict pre-delivery factory testing (including withstand voltage, loss, and turns ratio) ensures that oil-immersed transformers meet safety standards and deliver core advantages such as low losses, low operating costs, and maintenance-free operation. The products are tailored for overseas export scenarios (including support for customs clearance, Proforma Invoices, and other foreign trade services).
Our factory is in Shenyang City, Liaoning Province.We are a professional factory with more than 30 years experience in the field of High and low Voltage switchgears, Substation ,Transformers,Cable distribution box and various Electrical equipment. Our factory is the excellent supplier of State Grid Corporation od China. *We have more than 30 years to produce different kinds of transformers. *Our factory continue to insist to customers oriented and seek development of technology and science *Our products have high quality and the deep love of our customers *Our products have obtained international certifications such as ISO, CE, IEC certification. *We have a strong supply chain and after-sale service.
We offer OEM/ODM service. Our professional technical and quotation team can provice a satisfied project according to your drawing and parameters.
Our MOQ is 1 piece.
It depends on your product requirement and quantity.
Our core business focuses on the research, development, manufacturing, sales, and maintenance services of power equipment, including transformers, high and low voltage switchgear, and pre-assembled substations. We also provide power engineering construction, technical consulting, and self-operated import/export services, delivering one-stop power equipment solutions and supporting services to domestic and international clients. With years of deep involvement in the power equipment industry, we have accumulated extensive industry expertise.
The company was founded in 1993 and is located in Shenyang City, Liaoning Province. The specific address can be found on the “Contact Us” section of our official website, or you may contact customer service for detailed information.
Our company has obtained ISO 9001 Quality Management System Certification, CE Certification, IEC Certificate, ECM Certification, High-Tech Enterprise Certification, Green Environmental Protection Promotion Enterprise Certification, Environmental Management System Certification, Occupational Health and Safety Management System Certification, Quality Management System Certification, Smart Factory Certification, multiple invention patents, and utility model patents. All operations comply with relevant industry standards in China and target export markets. Certification documents are available for client verification.
Our products/services are primarily categorized into three main groups: New energy power equipment: such as wind and photovoltaic power generation supporting equipment; and services including: smart construction and maintenance, power construction, installation, and maintenance services, and smart construction and maintenance, power construction, installation, and maintenance services. For specific details, please refer to the “Products/Services” section on our official website or contact a sales consultant for a detailed introduction.
Product/service pricing is determined through comprehensive calculation based on product specifications, material standards, service duration, customization requirements, purchase volume, export logistics costs, and other factors. For a specific quote, please contact our sales consultant. After providing your detailed requirements, we will issue a comprehensive quotation proposal. Our pricing is transparent with no hidden fees.
Yes. For clients requiring customization, we can assign a dedicated team to develop a bespoke solution based on your specific needs. This includes: - Electrical equipment functionality, appearance, and specifications - International trade service processes, logistics methods, and customs clearance solutions - Service content, execution procedures, and timelines We ensure all personalized requirements are met.
You may learn more through the following methods: ① View detailed descriptions in the “Products/Services” section of our official website; ② Contact customer service to obtain product manuals; ③ Schedule an in-person demonstration or online presentation through customer service, where professionals will address your questions; ④ Contact customer service to obtain multilingual product materials and export compliance documentation.
The core differences lie in energy efficiency ratings and no-load losses. For industrial parks and scenarios with long-term full-load operation, choose the S20 series for sustained energy savings. For rural grids and scenarios with significant load fluctuations, the S13 series offers better cost-effectiveness. Specific selection should consider on-site conditions, capacity requirements, and installation environments. We provide complimentary selection consultation services.
Our products comply with internationally recognized standards and meet local market access requirements worldwide. We hold certifications such as ISO 9001 and can provide all necessary compliance qualifications and certification documents required by the destination country/region to ensure local customs clearance and usage requirements are met. For specific details, please contact our customer service or sales representatives.
We provide full-process technical support. Nationwide logistics distribution includes wooden crate packaging for impact protection. Export products use packaging compliant with international shipping standards to ensure cargo safety. Installation support includes remote video guidance + printed manuals with one-on-one wiring assistance. For complex projects, customized installation services can be arranged based on project requirements.
The procurement process primarily consists of four steps: ① You submit your procurement requirements (specifications, quantity, delivery time, delivery address); ② We issue a quotation and contract; both parties sign the contract after confirming its accuracy; ③ Payment is made according to the contract terms; ④ We deliver the products/provide the services as specified in the contract and complete the acceptance process.
Yes. For bulk purchasing clients, we offer corresponding volume discounts based on purchase quantity, cooperation duration, and other factors. Specific discount levels can be negotiated with our sales consultants.
We provide full-process foreign trade customs declaration services. The standard procedure is as follows: ① The client provides the Proforma Invoice (PI), packing list, and contract; ② Our company prepares the complete set of documents, including the customs declaration form and commodity inspection form; ③ We handle the declaration; ④ After clearance, we arrange sea/air freight. Supported trade terms include: FOB, CIF, EXW, DAP, etc., which can be flexibly selected based on the client's purchasing preferences.
We support small-batch trial orders and sample requests. ① Sample Scope: Standard accessories and small prototypes are available. ② Delivery Methods: Domestic shipments via standard logistics/courier; international shipments via FedEx/EMS. ③ Cost Details: Samples are free of charge; international shipping fees are borne by the customer.
To reduce the impact of exchange rate fluctuations, it is recommended to adopt multi-currency settlement. Additionally, based on the collaboration cycle, parties may negotiate fixed exchange rate settlement arrangements to minimize the effect of exchange rate volatility on their partnership.
You may submit feedback through the following channels: ① Send an email to tt@ttdl.cn. We will respond within 24 hours. ② Contact your assigned sales representative or customer service agent for assistance with reporting and resolution.
Yes. For customers purchasing our products or utilizing our collaborative services, we offer technical training and operational guidance to help them quickly master product usage and service integration techniques. Should you require technical support afterward, you may contact our technical team at any time. We will respond promptly to resolve any technical issues.
① Email or online customer service inquiries: Response within 24 hours; ② Contact your dedicated sales representative: Receive immediate response and expedited handling; ③ We will rapidly diagnose the cause of the failure and provide solutions through remote communication, operational parameters, and failure symptoms; ④ For on-site service, we will coordinate the optimal technical support plan based on the project location and actual circumstances.
Product returns and exchanges are handled according to the terms of the contract signed by both parties. Customers may submit requests through our after-sales service or sales representatives, providing order details, product information, and relevant explanations. We will review and process the request based on contractual agreements and actual circumstances. Note: Customized products and equipment that have been installed or used generally cannot be returned or exchanged; however, repair and technical support services are available. For products involving export, compliance with international trade, logistics, and customs clearance regulations is also required.
You may contact your assigned sales consultant or customer service representative, provide your order details, and inquire about the real-time progress. For export orders, you can simultaneously track customs clearance and logistics updates. We will also regularly update you on order production, delivery, or service execution to ensure you stay informed.
Specific job openings, qualification requirements, and related details are subject to the information published on the company's official website. Please visit the website for further details.
You may contact customer service online or send an email to tt@ttdl.cn. We will respond within 24 hours.
Our company strictly adheres to national privacy protection laws and regulations, establishing a comprehensive customer information protection system. All customer information is used solely for business coordination and service provision. We will never disclose or sell customer information to third parties without authorization, ensuring the security of customer data. For international trade clients, we additionally comply with privacy protection regulations of the target markets.
We strictly adhere to the laws and regulations of target markets. Our production processes comply with the ISO 14001 Environmental Management System; our products meet the RoHS environmental directive; and overseas projects implement local labor standards, ensuring compliant operations and safeguarding clients from compliance risks in their local business activities.
1. Ultra-low loss characteristics, energy-saving and high power efficiency 2. Low energy cost and ultra-low loss, maintenance-free and pollution-free 3. Low operating temperature, slow insulation aging and long service life of transformer 4. High overload capacity and high mechanical strength 5. Good harmonic resistance 6. Investment returns quickly
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1.Low Noise,No Environmental Contamination 2.Low Temperature Rise,High Overload Capacity 3.Strong Sudden Short-Circuit Resistance,Safe and Reliable Running 4.Low Losses,Evident EnergySaving Effects 5.High Insulation Level,Low Local Discharges
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1.Low Noise,No Environmental Contamination 2.Low Temperature Rise,High Overload Capacity 3.Strong Sudden Short-Circuit Resistance,Safe and Reliable Running 4.Low Losses,Evident EnergySaving Effects 5.High Insulation Level,Low Local Discharges
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1.Low Noise,No Environmental Contamination 2.Low Temperature Rise,High Overload Capacity 3.Strong Sudden Short-Circuit Resistance,Safe and Reliable Running 4.Low Losses,Evident EnergySaving Effects 5.High Insulation Level,Low Local Discharges
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1.Reasonable structure 2.Low loss and light weight 3.Low noise 4.High overload capacity 5.Cost saving
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1.Safe,Combustion Resistant/Fire Retardant,Without Pollution,Capable of Direct Installation on Load Center 2.Maintenance Free,Convenient to Install,Low in Composite Operation Cost 3.Excellent inHumidityResistance,Capable of Runing Normall under 100%Humidity,Capable of Being Putinto Operation atterdleness without 4.Pre-drying Treatment 5.LowLoss,LowLocal Discharges,Low Noise,Strong Heat Radiation,Capable ofRunning under 150% Nominal Load with the aid of Forced Air Cooling.
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1、Energy conservation, Stable operation, Highly efficient and Environmentally friendly advantages 2、 Reliable power guarantee for the power distribution system 3、Reduces energy consumption and environmental impact
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The S Series 10kV power transformers are among our company’s core products. Designed specifically for 10kV power distribution systems, they feature high-temperature resistance, low loss, and low noise, while ensuring long-term operational stability.
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1. High-temperature resistance: Enhanced safety at high temperatures, equipped with an efficient cooling system. 2. Low losses: The staggered joint structure effectively reduces the transformer’s no-load losses and no-load current. 3. Low noise: Noise is minimized through a low magnetic flux density design, high-quality high-permeability silicon steel sheets, reliable clamping and bracing measures, and special vibration-damping measures.
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1. Low loss, leak-free operation, low noise, and short-circuit resistance 2. Widely used in urban power grids, industrial and mining enterprises, and new energy power plants 3. Stable, efficient, and reliable voltage transformation and power transmission solutions
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