Yawei S11-S13 series 10KV to 35KV step up and step down distribution transformers are designed and produced in accordance with international and national standards, ensuring that the product's technical level and quality standards are in line with international standards.Whether you need a specific size, temperature rating, or mounting configuration, we work closely with you to create transformers with the proper magnetic topology for your application.
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Description
Technical Parameters
Jiangsu Yawei Transformer Co.,Ltd. is one of the leading manufacturers and suppliers of distribution transformers in China. Please feel free to buy high quality distribution transformers from our factory. Customized orders are welcome.
company profile
In the epicenter of contemporary industry, transformer factories stand as a vital link in the chain of power transmission, distinguished by their meticulous craftsmanship and state-of-the-art machinery. Within our facility, meticulously crafted transformers form the backbone of electrical systems and epitomize the march of industrial advancement.
Products Description
S11-S13 10-35kV transformer features:
1. Economical and environmental friendly with good performance
The transformer products in the S11-S13 series exhibit lower losses and currents compared to the S9 series. This is due to the continuously wound iron core, which has a circular cross-section, allowing full utilization of the silicon steel sheet's orientation. The iron core structure remains naturally tightened, eliminating the need for clamps that could degrade performance. As a result, the no-load loss is reduced by 20-45%, and the no-load current decreases by 60%-80%.
2. Longer life of the transformer
The fuel tank features a fully sealed design. It can be secured with bolts or welded at its edges, preventing any contact between the insulating oil and the air. This design slows the aging process of the insulating properties, thereby extending its service life.
3. Low noise
The noise has been decreased by over 10 decibels. The transformer core is a seamless unit with a compact structure, resulting in an operational noise reduction of 7-10 dB. This makes it highly suitable for installation in buildings and residential areas.
4. Reliable operation
The components within the fuel tank have been enhanced, increasing reliability and elevating the technological standard to ensure a secure seal.
5. The transformer is small in size
The S11 and S13 models utilize corrugated plate radiators. As the oil temperature fluctuates, the corrugated plates expand and contract, effectively taking on the function of an oil conservator.
Product certificate
1.Quality management system GB/T 19001-2016 ISO 9001: 2015
The operation of the whole YAWEI system is strictly controlled and managed. This ensures the quality of products and material in all stages, from receiving customer requests to design, materials, production, installation, testing, packaging, delivery, after-sales, all of which operate under strict and logically linked processes.
2.Certificate of compliance of UL and CUL
YaWei pad mounted transformer have been evaluated by UL in accordance with the U.S and Canada Standard(s). Our transformer certified by UL based on Canadian standards (CSA standards).
3.Accreditation certificate CE
Standard: EN 60076-1:2011.EN 60076-2:2011EN 60076-14:2013 confirms that YAWEI technical quality meets the requirements of all specific international standards for testing and calibration laboratories. All YAWEI products are fully tested in a qualified testing room before leaving the factory, ensuring stable quality and providing absolute peace of mind for customers.
Transformer General Technical Parameters
Technical Data Of SZ11 Series 35kV Low-loss And On-load Regulation Transformer
Rated Capacity
(kVA)
Voltage Combined
Vector-group
No-load Loss
75 °C
Load Loss
(W)
No Load
Loss
(W)
Short-
circuit Impendance
(%)
HV
(kV)
Tapping Ranges (%)
LV
(kV)
2000
35
±3 x 2.5%
6.3
10.5
Yd11
2300
19240
0.80
6.5
2500
2720
20640
0.80
3150
35
38.5
±3 x 2.5%
6.3
10.5
3230
24710
0.72
7.0
4000
3870
29160
0.72
5000
4640
34200
0.68
6300
5630
46770
0.68
6.3
8000
35
38.5
±3 x 2.5%
6.3
6.6
10.5
11
Ynd11
7870
40610
0.60
10000
9280
48050
0.60
12500
10940
56860
0.56
8.0
16000
13170
70320
0.54
20000
15570
82780
0.54
Transformer Testing
Transformer Packing and Shipping
Yawei Transformer boasts over 30 years of experience in transformer manufacturing and export, making them highly adept in the intricacies of transformer packaging and transportation.
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Q: 1.What happens when a distribution transformer fails?
A: When a distribution transformer fails, several consequences can occur: Power Outage: The most immediate and noticeable impact is a power outage in the area served by the transformer. This can affect homes, businesses, and public services. Equipment Damage: If the transformer failure is due to an internal fault, it can cause damage to the transformer itself, which might require repair or replacement. This can be costly and time-consuming. Electrical Surges: At the moment of failure, there could be electrical surges that may damage connected electrical devices and appliances in the nearby area. Fire Hazard: In some cases, transformer failures can lead to fires, especially if the transformer uses oil for cooling and insulation. Leaking oil can ignite if it comes into contact with hot surfaces or electrical arcs. Environmental Hazards: If the transformer contains toxic materials like PCBs (polychlorinated biphenyls, which are now banned in many countries but may still be found in older transformers), a failure could lead to environmental contamination. Network Instability: The failure of a transformer can impact the stability of the electrical grid, especially if it is a key transformer in the network. This might lead to voltage fluctuations or affect the reliability of the grid in that area. Economic Impact: Beyond the cost of repairing or replacing the transformer, businesses affected by the power outage may suffer economic losses due to interrupted operations. Safety Risks: There is a risk to public safety, especially if the transformer is in a populated area. Explosions or fires can pose immediate danger to people nearby. Utility companies usually have contingency plans to address transformer failures, including the use of mobile transformers and rapid response teams to minimize downtime and restore power as quickly as possible. Regular maintenance and monitoring of transformers are also critical in preventing such failures.
Q: 2.What is the difference between a substation and a distribution transformer?
A: A substation and a distribution transformer are both crucial components of the electrical power distribution system, but they serve different functions and have distinct characteristics: Purpose and Function: Substation: A substation is a part of the electrical generation, transmission, and distribution system where voltage is transformed from high to low or the reverse using transformers. Substations contain various high-voltage equipment like circuit breakers, switches, and transformers, and they play a key role in controlling and protecting the power transmission system. Distribution Transformer: A distribution transformer is a specific type of transformer used to step down the voltage for the final delivery of electricity to end-users (like homes and businesses). It typically reduces the voltage from the primary distribution level to the level used by customers (for example, from 11kV or 33kV down to 230/400V). Location: Substation: Substations are usually located at a key point in the power grid, often where transmission lines connect to distribution lines. They can be found in both urban and rural areas and are usually enclosed by fencing for safety and security. Distribution Transformer: Distribution transformers are more widely distributed and are found closer to end-users. They can be seen mounted on utility poles (pole-mounted transformers) or on the ground in residential areas (pad-mounted transformers). Size and Capacity: Substation: Substations are larger and more complex, housing multiple transformers and other electrical equipment. They are designed to handle higher power levels for transmission over long distances. Distribution Transformer: These are smaller in size compared to the transformers found in substations. They are designed for lower power levels suitable for distribution to end-users. Complexity: Substation: A substation is a complex facility with various types of high-voltage equipment and is usually manned and monitored by trained personnel. It includes protective devices, switching gear, and control equipment. Distribution Transformer: These are relatively simpler and are designed for automatic operation without direct human intervention under normal operating conditions. Scope of Service: Substation: It serves a broader area and is a critical node in the power distribution network, impacting large regions or entire cities. Distribution Transformer: It typically serves a much smaller area, like a neighborhood or a few buildings. In summary, substations are key nodes in the electrical grid that perform a range of functions including voltage transformation, while distribution transformers are specific components within the grid that primarily focus on reducing voltage to levels usable by end consumers.
Q: 3.Why do distribution transformers burn?
A: Distribution transformers can burn or fail due to several reasons, ranging from electrical faults to external factors. Here are some of the common causes: Overloading: One of the most common reasons for transformer burnout is overloading. When a transformer is subjected to a load greater than its rated capacity for an extended period, it overheats. This can cause the insulation materials to degrade or even catch fire, leading to a burnout. Electrical Faults: Short circuits or faults in the electrical network can lead to excessive current flow through the transformer. This can cause overheating and potentially lead to a fire. Faults can be due to external damage, such as when power lines are damaged by storms or accidents. Aging and Wear: Over time, transformers undergo wear and tear. Aging insulation, corroding components, and mechanical wear can lead to failures. Older transformers are particularly prone to breakdowns if they haven't been properly maintained. Poor Maintenance: Lack of regular maintenance can lead to a buildup of dust, moisture, and rust, which can degrade a transformer's performance and lead to overheating and eventual burnout. Manufacturing Defects: In some cases, manufacturing defects in transformers can lead to early failures. These defects might include issues with winding, insulation, or other components. External Damage: Transformers can be damaged by external factors like lightning strikes, vandalism, or environmental conditions (like flooding or extreme temperatures) that can lead to failures. Moisture and Contamination: Moisture ingress can cause short circuits in transformers. Similarly, contamination from pollutants, animals, or other foreign objects can lead to electrical faults. Cooling System Failure: Transformers rely on cooling systems (like oil or air cooling) to dissipate heat. If the cooling system fails, the transformer can overheat and burn out. When a transformer burns, it can pose a serious risk of fire, especially if it uses oil as a cooling and insulating medium. Modern transformers are equipped with protective devices to minimize these risks, and regular maintenance is crucial to ensure their safe and efficient operation.
Q: 4.How to install a distribution transformer?
A: Installing a distribution transformer is a complex task that requires careful planning and adherence to safety standards and regulations. It typically involves the following steps and considerations: Site Selection and Preparation: Choose a suitable location considering accessibility for maintenance, proximity to load centers, and safety. Prepare the site, ensuring it's level and stable. For pole-mounted transformers, select a sturdy pole at an appropriate location. Compliance with Standards: Ensure the installation complies with local electrical codes and standards. Obtain necessary permits and approvals from local authorities or power companies. Safety Precautions: Follow strict safety protocols to protect installers and the public. Ensure all personnel are trained and equipped with appropriate safety gear. Transportation and Handling: Transport the transformer to the site with care to avoid damage. Use proper lifting equipment and techniques to position the transformer. Mounting the Transformer: For pole-mounted transformers, use a crane or hoist to lift and secure the transformer to the pole. For pad-mounted transformers, place them on a prepared concrete pad that can support the weight. Electrical Connections: Connect the primary and secondary windings according to the network's voltage requirements. Ensure all connections are tight and properly insulated. Grounding: Properly ground the transformer to prevent electrical hazards and ensure safe operation. Cooling System: If the transformer has an active cooling system (like oil or fans), check and ensure it is functioning correctly. Testing: Perform tests to ensure the transformer is operating correctly before energizing it. This might include insulation resistance tests, turns ratio tests, and checking for any physical defects. Energizing: Once installed and tested, the transformer can be energized. This should be done following standard operating procedures and with caution. Final Inspection and Documentation: Conduct a final inspection to ensure everything is installed correctly. Document the installation process and any relevant electrical readings for future reference. Regular Maintenance: Establish a schedule for regular maintenance to ensure the transformer's longevity and reliability. It's important to note that the installation of a distribution transformer should only be carried out by qualified electrical professionals due to the high risks involved, including electrical hazards and potential for serious injury or property damage. Additionally, the specific steps and requirements can vary depending on the type of transformer, local regulations, and the specific conditions of the installation site.
Q: 5.What is the maximum efficiency of a distribution transformer?
A: The maximum efficiency of a distribution transformer varies based on its design, size, and operating conditions. However, modern distribution transformers typically achieve high levels of efficiency, often in the range of 95% to 99%. This efficiency refers to the transformer's ability to convert input electrical power to output electrical power with minimal losses. Several factors influence the efficiency of a distribution transformer: Core Material and Design: The core is usually made of high-grade silicon steel, which reduces hysteresis losses (losses due to the magnetization and demagnetization of the core). Winding Material: Copper windings are commonly used for their low resistance, which reduces copper losses (I²R losses due to the resistance of the winding). Transformer Size and Rating: Larger transformers generally have higher efficiency because their ratio of surface area to volume is lower, reducing relative losses. The efficiency also varies with the load; transformers are most efficient at or near their rated capacity. Load Conditions: Transformers are most efficient when they operate close to their designed load. Operating a transformer significantly under or over its rated capacity can lead to inefficiencies. Cooling Systems: Effective cooling systems help maintain operational efficiency by managing the heat generated by the transformer. Quality of Manufacturing: Precision in manufacturing reduces losses due to imperfections in the core and windings. To maximize efficiency, it's crucial to select a transformer with the appropriate rating for its intended use. Additionally, advancements in materials and manufacturing techniques continue to push the boundaries of transformer efficiency. It's important to note that while maximum efficiency is an important aspect of a transformer's performance, other factors like durability, reliability, and maintenance requirements are also crucial for overall performance assessment.
