Oil Immersed Self Cooled Transformer

I. Product Introduction

The S18 series transformers are a new generation of high-efficiency and energy-saving distribution transformers, covering two mainstream types: oil-immersed (S18) and dry-type (SCB18). They are mainly used in 10kV and 35kV power distribution network systems and serve as core power equipment connecting high-voltage power grids and terminal power consumption. The series has been comprehensively optimized in material selection, structural design and process upgrading, with the core positioning of "high energy efficiency, high reliability, low loss and easy operation and maintenance". It strictly complies with national standards such as the GB1094 series and GB20052-2020 "Minimum Allowable Values of Energy Efficiency and Energy Efficiency Levels for Power Transformers". Adapting to the diversified power demand under the "dual carbon" policy, such as power grid energy-saving renovation, industrial upgrading and commercial supporting facilities, it can effectively reduce power loss and improve power supply stability, making it an ideal replacement for traditional transformers.

Among them, the oil-immersed S18 transformer focuses on outdoor and large-scale industrial scenarios, adopting a fully sealed structural design to eliminate oil leakage hazards and adapt to complex outdoor environments; the dry-type SCB18 transformer takes epoxy resin casting technology as the core, with no oil and no explosion risk, focusing on indoor and sensitive scenario adaptation. Together, the two form a full-scenario high-efficiency power distribution solution, balancing energy saving and practicality, and widely serving multiple fields such as power, industry, commerce and people's livelihood.

2. Specifications and Parameters(Customizable)

The specifications and parameters of the S18 series transformers cover two types: oil-immersed (S18) and dry-type (SCB18). The core parameters are as follows, which can be customized and adjusted according to actual power demand to ensure adaptation to the load requirements of different scenarios:

(I) General Basic Parameters

· Voltage Level: 10kV/0.4kV (mainstream), 35kV/10.5kV (optional for oil-immersed type), complying with the requirements of national power distribution network standard voltage levels;

· Frequency: 50Hz, adapting to the domestic power frequency power system with strong operation stability;

· Connection Group Label: YD11, Dyn11 (conventional), which can be customized and adjusted according to power grid requirements to ensure the matching of power transmission;

· Short-Circuit Impedance: 6%, 7% (conventional), optimized design to improve short-circuit resistance and avoid damage to equipment caused by short-circuit impact;

· Energy Efficiency Level: The oil-immersed S18 is grade 3 energy efficiency, and the dry-type SCB18 reaches grade 1 energy efficiency (NX1), both superior to the national standard limit value, with outstanding energy-saving effect;

· Insulation Level: Grade A (insulating oil) for oil-immersed type, Grade F (epoxy resin) for dry-type, with excellent insulation performance and long-term stable operation;

· Service Life: ≥30 years, the fully sealed structure and high-quality material selection greatly extend the service cycle of the equipment and reduce the replacement cost.

(II) Specific Parameters of Oil-Immersed S18

· Rated Capacity: 200kVA-31500kVA, among which 200kVA is suitable for small-scale power consumption scenarios, and 3150kVA-31500kVA is suitable for large-scale industrial, substation and other scenarios;

· Cooling Method: AN/ON (oil-immersed self-cooling/forced oil circulation cooling), corrugated oil tank heat dissipation design, low temperature rise and small footprint, suitable for long-term outdoor operation;

· Voltage Regulation Method: No-load voltage regulation (conventional), on-load voltage regulation (optional). The on-load voltage regulation model can automatically switch taps under load to stabilize the secondary output voltage;

· Loss Parameters: No-load loss is 15%-25% lower than that of the traditional S13 series, and load loss is 10%-15% lower, with significant power saving effect in long-term operation;

· Noise Level: ≤60dB, optimized through low magnetic flux density design and shock absorption technology, the noise is lower than the national standard requirement, reducing environmental interference;

· Protection Level: IP54 (conventional for outdoor use), the surface of the oil tank is treated with phosphating + three-proof paint coating, which is moisture-proof, mildew-proof and salt-spray proof, adapting to harsh environments;

· Core Materials: High-permeability cold-rolled silicon steel sheet iron core and oxygen-free copper winding, improving magnetic conductivity and electrical conductivity, and reducing loss.

(III) Specific Parameters of Dry-Type SCB18

· Rated Capacity: 30kVA-2500kVA, suitable for indoor small and medium-sized power consumption scenarios, such as high-rise buildings and data centers;

· Cooling Method: AN (self-cooling), AF (forced air cooling). The forced air cooling model can realize capacity expansion operation, adapting to high load fluctuation scenarios;

· Voltage Regulation Method: No-load voltage regulation, voltage regulation range ±2×2.5%, meeting the requirements of different voltage fluctuations and ensuring power supply quality;

· Loss Parameters: No-load loss is 10%-15% lower than that of the SCB14 series, meeting the grade 1 energy efficiency (NX1) standard, with significant annual power saving;

· Noise Level: ≤55dB, no mechanical vibration noise due to oil-free operation, suitable for sensitive scenarios such as residential areas and hospitals;

· Protection Level: IP20-IP54 (customizable), epoxy resin cast winding, moisture-proof and dust-proof, with small partial discharge;

· Core Materials: High-permeability silicon steel sheet iron core and full copper foil winding, the winding is equipped with heat dissipation air channels, with good thermal stability and strong overload capacity.

(IV) Other Optional Parameters

Customizable intelligent monitoring modules (temperature, partial discharge, load online monitoring) are available, supporting access to intelligent cloud platforms such as TYT.FURTURE; the protection level, voltage regulation method and capacity specification can be adjusted according to scenario requirements to adapt to the use requirements of special environments (such as high humidity, dusty, coastal and chemical scenarios).

3. Main Features

The S18 series transformers integrate the three core advantages of materials, processes and structures. The oil-immersed and dry-type models have their own focuses, and at the same time have general core highlights, balancing energy saving, reliability and convenience. The specific features are as follows:

(I) General Core Features

1. High Efficiency and Energy Saving, Adapting to Dual Carbon: The whole series adopts high-permeability cold-rolled silicon steel sheets and full copper windings, with optimized magnetic circuit design, and the loss is much lower than the national standard. Among them, the dry-type SCB18 reaches grade 1 energy efficiency (NX1), and the oil-immersed S18 is grade 3 energy efficiency. Long-term operation can greatly save electricity bills, with a short investment payback period, which is in line with the "dual carbon" policy and power grid energy-saving renovation needs, helping to reduce carbon emissions.

2. Safe and Reliable, Stable Operation: Adopting ampere-turn balance design, the winding has high mechanical strength, the iron core clamping parts are calculated for strength and stiffness, and the winding spacers are densified, with outstanding short-circuit resistance. It can withstand sudden short-circuit impact, avoid thermal and mechanical damage; the partial discharge is small, and there is no magnetic leakage and overheating phenomenon, ensuring long-term stable operation and reducing the risk of unplanned shutdown.

3. Low Noise and Environmental Protection, Strong Compliance: Through the optimization of low magnetic flux density design, high-quality silicon steel sheet selection and shock absorption technology, the noise is 3-5dB lower than the national standard, ≤60dB for oil-immersed type and ≤55dB for dry-type, reducing environmental interference; the dry-type has no insulating oil and no explosion risk, and the oil-immersed type adopts environmentally friendly transformer oil and fully sealed design, with no leakage, no pollution and recyclable materials, complying with environmental protection standards.

4. Easy Maintenance and Long Service Life: The whole series adopts maintenance-free/less maintenance design. The dry-type transformer basically requires no maintenance. The fully sealed structure of the oil-immersed type cancels the oil conservator, eliminates oil leakage, reduces the frequency of oil inspection and oil change, and lowers the operation and maintenance cost; the fasteners of the oil tank adopt locknuts, which can withstand the impact of long-distance transportation without loosening, and the overall service life of the equipment can reach more than 30 years.

5. Intelligent Adaptation, Flexible Adjustment: It can be equipped with intelligent temperature control and online monitoring modules to realize real-time monitoring of temperature, partial discharge and load, over-temperature alarm/trip, support cloud platform access, and facilitate remote operation and maintenance; the voltage regulation method can be adjusted according to power grid voltage fluctuations, adapting to different load scenarios, with flexible installation and adapting to various power distribution layouts.

(II) Exclusive Features of Oil-Immersed S18

1. Fully Sealed and Leakage-Free: The oil tank and seals adopt high-quality one-time forming acrylate rubber, which has passed positive pressure and negative pressure double leak test to ensure no oil leakage, avoid insulation oil deterioration and insulation moisture aging, and adapt to long-term outdoor operation.

2. Strong Environmental Adaptability: The surface of the oil tank is treated with phosphating + three-proof paint coating, which is moisture-proof, mildew-proof and salt-spray proof. It can operate stably in harsh environments such as -15℃～+40℃, high humidity, dusty, coastal and petrochemical, adapting to complex industrial scenarios such as metallurgy and mining.

3. Efficient Heat Dissipation, Adapting to Large Loads: The fin plate of the corrugated oil tank body is used as a heat dissipation and cooling element, which can expand and contract with the increase and decrease of transformer oil, with high heat dissipation efficiency and low temperature rise design. It is suitable for large capacity requirements of 3150kVA-31500kVA and can be used in power plants, substations and other scenarios.

(III) Exclusive Features of Dry-Type SCB18

1. Fire and Explosion Proof, Safe and Secure: Epoxy resin vacuum cast winding, no oil and no ignition point, eliminating explosion risk. It can be installed in densely populated or sensitive areas such as indoors, basements and load centers, such as hospitals, office buildings and data centers.

2. Compact Structure, Space Saving: Under the same capacity, the volume is 30%-40% smaller than that of the oil-immersed type, with light weight, no need for a special oil pit, and can be directly installed in floor power distribution rooms and basements, adapting to space-constrained scenarios such as high-rise buildings and urban power grid renovation.

3. Excellent Heat Dissipation, Strong Overload Capacity: The winding is equipped with its own heat dissipation air channels, and the forced air cooling model can realize capacity expansion operation, which can adapt to short-term high load fluctuations, with good thermal stability and small partial discharge, adapting to scenarios with high requirements for power supply stability such as data centers and precision electronic equipment.

IV. Application Scenarios

With the differentiated advantages of oil-immersed and dry-type models, the S18 series transformers cover all scenarios such as outdoor, indoor, industrial, commercial and people's livelihood, adapting to different voltage levels, load requirements and environmental requirements. The specific application scenarios are as follows:

(I) Application Scenarios of Oil-Immersed S18

1. Power System: 35kV/10kV substations and outdoor power distribution stations, as core equipment of the power distribution network, connecting high-voltage power grids and terminal power consumption. They are suitable for the upgrading and renovation of urban and rural power grids, and can replace traditional high-loss transformers to reduce power grid loss.

2. Large-Scale Industrial Scenarios: Enterprises such as metallurgy, mining, petrochemical, chemical industry and nuclear power plants, adapting to high load and harsh environment requirements, can withstand load impact under complex working conditions, and provide stable high-voltage power supply for production equipment, such as large-scale production lines and heavy machinery supporting facilities.

3. Outdoor Public Facilities: Large outdoor public facilities such as highways, railways, airports and ports, adapting to long-term outdoor operation, withstanding high and low temperatures, wind and rain, salt spray and other environments, providing stable power supply for lighting, monitoring and equipment operation.

4. Large-Scale Commercial and Parks: Industrial parks, industrial parks and large commercial complexes (outdoor power distribution areas), providing centralized power distribution for multiple enterprises and merchants in the park, adapting to large capacity and long-cycle operation requirements, and reducing the operation and maintenance cost of the park.

(II) Application Scenarios of Dry-Type SCB18

1. Urban Buildings: High-rise buildings, office buildings, apartments and residential districts, installed in indoor power distribution rooms and basements, with no oil and no explosion risk, low noise, no impact on residents' lives and office environment, providing power supply for lighting, air conditioning, elevators and other equipment in the building.

2. Sensitive Places: Densely populated places with high requirements for safety and environmental protection, such as hospitals, theaters, hotels, schools and libraries, with no oil pollution and no noise interference, can be installed near the load center to ensure safe and reliable power supply.

3. Precision Electronics and Data Centers: Data centers, precision instrument workshops and electronic factories, adapting to high stability and low loss requirements, can withstand short-term high load fluctuations, provide stable power supply for servers and precision instruments, and avoid equipment damage caused by voltage fluctuations.

4. Underground and Special Spaces: Underground spaces such as tunnels, subways and underground power stations, adapting to high humidity and closed environments, with excellent moisture-proof and dust-proof performance, can operate stably for a long time, providing reliable power distribution for underground facilities.

5. Urban Power Grid Renovation: Space-constrained areas such as old urban areas and city centers, with compact structure and no need for oil pits, can replace traditional oil-immersed transformers to realize nearby power distribution, shorten the power supply radius and improve power supply quality.

(III) General Adaptation Scenarios

In addition to the above exclusive scenarios, the S18 series transformers can be widely used in new energy supporting facilities (such as photovoltaic and wind power supporting power distribution), rural power grid upgrading, temporary power supply (such as construction site temporary power distribution) and other scenarios. According to the load capacity, environmental conditions and safety requirements of different scenarios, customized specifications can be made to realize efficient, stable and energy-saving power distribution services, helping the power upgrading of all walks of life.

4.company profile

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.