Hermetically Sealed Transformer

Product Introduction

1.Rron core：sheets with high magnetic conductivity, full diagonal seams, step overlap, and polyester tapebinding structure to meet the requirements of transformers with low no  load loss and low noise level.By adding vibration isolation pads between the body and the oil tank, the transmission of iron corevibration to the oil tank is more effectively reduced.

2.Winding: high quality oxygen free copper with lower resistivity is selected and wound onhorizontal winding machines and large CNC vertical winding machines with advanced axial and radialcompression devices. Reasonable transposition between parallel wires and the use of magnetic shield  ing to guide leakage flux when necessary have effectively reduced transformer load losses. Reasonablydesign the insulation structure to improve the transformer's ability to withstand overvoltage; Optimiz  ing the distribution of winding turns, increasing radial support and axial compression of windings, usingpre densification treatment with cushion blocks, overall winding assembly, and constant voltage dryingprocesses, greatly improve the ability of transformers to resist impact current.

3.Oil tank: adopts bell jar or cylinder structure, carbon dioxide protection welding process, selectssealing materials, and mechanically processes the rubber gasket limit groove. Combined with strict leaktesting procedures, these measures minimize the possibility of transformer leakage.

4. The use of newtype plate radiators or air coolers greatly improves the appearance quality of transformers.The use of cold pressing equipment to achieve cold pressing connection of leads has improvedthe cleanliness of the device body; Vacuum treatment and vacuum oiling of transformers effectivelyreduce the level of partial discharge and i

mprove the reliability of transformer operation.

5.The "six directional positioning" structure is adopted between the transformer body and the oiltank to ensure that the transformer has strong resistance to transportation impact and earthquake

6.Surface treatment and coating: fine treatment is carried out on the surface of the fuel tank,including seven processes such as acid washing and phosphating, and sprayed with special anti  corrosion paint to ensure that the coating does not peel off and the steel structural components are notcorroded.

Product Parameters(Customizable)

It is the mainstream energy-saving model of 10kV class three-phase oil-immersed non-excitation voltage regulation distribution transformers. The following are the complete national standard specifications and parameters (in accordance with GB 20052-2020 and GB/T 6451-2015).

1. Model Meaning (S11-M-630/10)

     S: Three-phase

     11: Performance level (loss level)

     M: Fully sealed structure (omitted for non-sealed)

     630: Rated capacity (kVA)

     10: Rated voltage of high-voltage side (kV)

2. General Technical Parameters

     Voltage combination: 10±5%/0.4kV (commonly used), 6/0.4kV, 35/0.4kV

     Connection group symbol: Dyn11 (priority), Yyn0

     Frequency: 50Hz

     Cooling method: ONAN (oil-immersed self-cooling)

     Voltage regulation method: Non-excitation voltage regulation, ±5% or ±2×2.5%

     Insulation level: High voltage LI75kV/AC35kV; Low voltage LI20kV/AC8kV

     Temperature rise limit: Top oil 55K, winding 65K (resistance method)

     Operating conditions: Outdoor/indoor, altitude ≤1000m, ambient temperature -25℃~+40℃

3.Core Loss and Impedance Parameters (10/0.4kV, National Standard Values)

| Rated Capacity (kVA) | No-load Loss (W) | Load Loss (W) | No-load Current (%) | Short-circuit Impedance (%) |

| 30             | 100          | 630          | 1.1          | 4.0          |

| 50             | 130          | 910          | 1.0          | 4.0          |

| 80             | 180          | 1310         | 1.0          | 4.0          |

| 100            | 200          | 1580         | 0.9          | 4.0          |

| 125            | 240          | 1980         | 1.5          | 5.5          |

| 160            | 290          | 2420         | 1.4          | 5.5          |

| 200            | 330          | 2860         | 1.3          | 5.5          |

| 250            | 400          | 3450         | 1.2          | 4.0          |

| 315            | 480          | 4150         | 1.1          | 4.0          |

| 400            | 570          | 4950         | 1.1          | 4.0          |

| 500            | 680          | 5900         | 1.0          | 4.0          |

| 630            | 810          | 7200         | 1.0          | 4.5          |

| 800            | 980          | 8800         | 0.9          | 4.5          |

| 1000           | 1150         | 10800        | 0.9          | 4.5          |

| 1250           | 1360         | 13000        | 0.9          | 4.5          |

| 1600           | 1640         | 16000        | 0.8          | 5.0          |

| 2000           | 1940         | 19500        | 0.8          | 5.0          |

| 2500           | 2270         | 23500        | 0.8          | 5.0    

35kV Class S11 Main Parameters (Example)

   500kVA: No-load loss 680W, Load loss 6910W, Short-circuit impedance 6.5%

   1000kVA: No-load loss 1150W, Load loss 13800W, Short-circuit impedance 6.5%      

Product Features

·  Excellent Energy-Saving Performance

Compared with traditional S9 series, the no-load loss is reduced by about 30%, which greatly saves power consumption and operation cost.

·  Low No-Load Loss

Adopts high-quality high-permeability silicon steel sheet and optimized core structure, with low power consumption even under light load.

·  Low Noise

Optimized magnetic circuit and core stacking structure ensure low noise during operation, suitable for residential areas, factories and other occasions.

·  High Reliability & Long Service Life

Fully sealed structure (S11M) effectively prevents oil leakage and moisture, slows down insulation aging, and requires less maintenance.

·  Wide Application

Suitable for 10kV/0.4kV, 6kV, 35kV power systems.

Wide capacity range: 30–2500kVA.

Can be used indoors and outdoors.

·  Safe and Stable Operation

Good short-circuit withstand capability and overload capacity.

Equipped with gas relay, thermometer, pressure relief device and other protections.

Product Advantages

1.Reasonable structure: Using modern computing technology to analyze the electrical, magnetic,mechanical, and thermal characteristics of transformers, and based on this, designing constructiondrawings to make the product structure more reasonable and complete.

2.Advanced performance: In addition to meeting relevant national standards, the product's perfor-mance can also be specially designed according to user requirements, and the partial discharge level issignificantly lower than the values specified in national standards.

3.Safe and reliable: Based on the analysis of the electrical, magnetic, mechanical, and thermalproperties of the transformer, the winding insulation structure, ampere turn distribution, and coolingsystem are designed to improve the transformer's ability to withstand the impact of overvoltage andshort-circuit current, without worrying about local overheating.

4.Preferred components: Select high-quality domestic or imported components according to userrequirements, further improving the reliability of product operation.

5.Worry free for users: beautiful appearance, no leakage, no hanging center, no maintenance.

Application scenarios

·  Urban and Rural Power Grid

Public distribution transformers for residential quarters, streets, and rural power grids.

·  Industrial and Mining Enterprises

Factory power supply, workshop distribution, small and medium-sized industrial and mining equipment.

·  Commercial and Public Buildings

Shopping malls, supermarkets, hospitals, schools, office buildings, hotels.

·  Infrastructure Projects

Roads, bridges, water supply and drainage pumping stations, construction sites.

·  New Energy Supporting Facilities

Photovoltaic power stations, wind power integration, small power generation and distribution systems.

·  Various Outdoor Installations

Pillar-mounted, ground-mounted, box-type substation supporting use.

About Us

Xinda Transformer Co., Ltd. is located at No. 38, Jinsan Road, Fenghuang Industrial Park, Dongchangfu District, Liaocheng City, Shandong Province, China. The company has a registered capital of RMB 150 million and covers an area of approximately 186,667 square meters (280 mu). It is recognized as a National High-Tech Enterprise, a Shandong Province Technology Innovation Demonstration Enterprise, an Excellent Private Technology Enterprise of Shandong Province, a Shandong Model Base for Employment of the Disabled, a Shandong Province Contract-Honoring and Trustworthy Enterprise, a Liaocheng Municipal Enterprise Technology Center, an Excellent Industrial Enterprise of Dongchangfu District, a Science and Technology Innovation Demonstration Enterprise of Dongchangfu District, and a Key Backbone Enterprise of Dongchangfu District.

The annual production capacity is 9,000 MVA. The total construction area of office buildings, R&D facilities, and standardized workshops is 53,000 square meters. Equipped with over 470 sets of advanced production equipment, the company possesses a manufacturing capacity of 10,000 MVA for transformers up to 220 kV, along with complementary switchgear systems. With qualifications in Power Engineering General Contracting and a dedicated technical construction team, Xinda ranks among the leading power transformer manufacturers in China, excelling in R&D, manufacturing, and integrated engineering services.