The oil-immersed transformer is a new type of high-performance transformer with a more reasonable structure and better performance. It uses oil as the main insulation medium and relies on oil as the cooling medium, such as oil-cooled self-cooling, oil-cooled air-cooling, oil-cooled water-cooling, and forced oil circulation, etc. The main components of the transformer include the iron core, windings, oil tank, oil reservoir, respirator, explosion-proof tube (pressure release valve), heat sink, insulation bushing, tap changer, gas relay, thermometer, and oil purifier, etc.
Due to the long-term immersion of the silicon steel sheets in the transformer, oil can seep into the interlayers, and the transformer oil has elasticity to act as a buffer. Therefore, the oil-immersed transformer has low noise. However, the voltage regulating switch is inside the oil tank. When adjusting the voltage, the contact condition of the switch cannot be seen outside. If the contact is not good, it is equivalent to a break in that circuit. If the contact is poor, when the load is too large, the switch is prone to burn out.
Transformer normal service conditions
1.The height above the sea level is below 1000m;
2.Highest air temperature +40ºC;
3.Highest daily average air temperature+30ºC;
4.Highest annual average air temperature +20ºC;
5.Lowest outdoor air temperature -25ºC.
(defines in detail when transformer in special service conditions )
Type of cooling
(1) Oil-immersed transformers usually adopt three cooling methods: oil-immersed self-cooling, oil-immersed air-cooling, and forced oil circulation.
The oil-immersed self-cooling method relies on the natural convection of oil to dissipate heat.
(2). The oil-immersed air-cooling method is based on the oil-immersed self-cooling method, and additional fans are added to blow air into the oil tank and oil pipes to enhance the heat dissipation effect. Forced oil circulation uses an oil pump to extract the hot oil from the transformer, cool it outside the transformer, and then send it back into the transformer.
Structure Function
In the main substation of the urban rail transit power supply system, the main transformer usually adopts a three-phase oil-immersed transformer. The oil-immersed transformer mainly consists of the core, windings, oil tank, voltage regulating device, radiator, oil reservoir, gas relay, insulation bushing, explosion-proof tube, etc.
1. Core
The core is composed of silicon steel sheets stacked together with good magnetic conductivity. It forms a magnetic flux closed circuit, and the primary and secondary windings of the transformer are wound on the core.
The transformer core is divided into two structures: core type and shell type. Currently, the widely used transformers are of core type. The core of the core type transformer consists of the core column and the yoke. The core of the oil-immersed transformer has oil channels inside for cooling the core, which facilitates the circulation of transformer oil and also enhances the heat dissipation effect of the equipment.
2. Winding
The winding, also known as the coil, is the conductive circuit of the transformer. It is made by winding copper wire or aluminum wire into multiple layers of cylindrical shapes. The primary and secondary windings are concentrically arranged on the core column and are insulated from each other. The low-voltage winding is usually inside and the high-voltage winding is outside. The insulating material is wrapped around the wire to ensure insulation between the wires and between the wires and the ground.
3. Oil Tank
The oil tank is the outer shell of the oil-immersed transformer. Besides holding oil, it is also used to install other components.
4. Voltage Regulator
The voltage regulator is set up to ensure the stability of the secondary voltage of the transformer. When the power supply voltage fluctuates, the voltage regulator is used to adjust the tap switch of the transformer to ensure the stability of the secondary output voltage. The voltage regulator is divided into on-load voltage regulator and off-load voltage regulator.
5. Radiator
The radiator is installed on the oil tank wall. The upper and lower parts are connected to the oil tank through pipes. When there is a temperature difference between the upper and lower oil temperatures of the transformer, the radiator forms oil convection, and the cooled oil flows back to the oil tank to reduce the temperature of the transformer oil. To improve the cooling effect, measures such as self-cooling, forced air cooling, and forced water cooling can be adopted.
6. Oil Sump
The oil sump is also called the oil tank. Transformer oil will undergo thermal expansion and contraction due to temperature changes, and the oil level will rise or fall accordingly. The function of the oil sump is to provide a buffer for the thermal expansion and contraction of the oil, keeping the oil tank always filled with oil; at the same time, due to the presence of the oil sump, the contact area between the oil and air is reduced, which can slow down the oxidation of the oil.
7. Gas Relay
The gas relay, also known as the gas protection relay, is the main protection device for internal faults of the transformer. It is installed in the middle of the connecting pipe between the oil tank and the oil sump. When a serious fault occurs inside the transformer, the gas relay connects the circuit breaker trip path; when a less serious fault occurs inside the transformer, the gas relay connects the fault signal circuit.
8. Insulation Bushing
The high and low insulation bushings are located on the top cover of the transformer oil tank. For oil-immersed transformers, porcelain insulation bushings are generally used. The insulation bushing's function is to maintain good insulation between the high and low voltage windings leads and the oil tank, and to fix the leads.
9. Explosion-proof Tube
The explosion-proof tube, also known as the safety air passage, is installed on the transformer's oil tank. Its outlet is sealed with a glass explosion-proof membrane. When a serious fault occurs inside the transformer and the gas relay fails, the gas inside the oil tank will break through the glass explosion-proof membrane from the safety air passage and prevent the transformer from exploding.
Our Advantages
1.The insulation performance is excellent, which can reduce the insulation distance and lower the cost.
2.The transformer oil has a low viscosity and good heat transfer performance.
3.It can effectively protect the core and windings from the influence of moisture in the air.
4.It protects the insulating paper and insulating paperboard from the action of oxygen, reduces the aging of insulating materials, and extends the lifespan of the transformer.
5.Low maintenance cost and low noise level
Product Parameters
Introducing the S9-M(30-2500)/10 3-phase oil-immersed distribution transformer. This state-of-the-art equipment is meticulously engineered for optimal energy efficiency and minimal energy loss, ensuring top-tier performance for all your electrical distribution needs. Experience unparalleled reliability and long-lasting durability, making it the quintessential solution for modern electrical grids.
Rated
capacity(kVA) |
High voltage(kV) |
Tap range |
Low voltage(kV) |
connected group label |
No-load
loss(w) |
Load loss
(75ºC)(W) |
No-load current(%) |
| 30 |
6
6.3
6.6
10
10.5
11 |
±2*2.5
±5 |
0.4 |
Dyn11
Yyn0
Yzn11 |
80 |
630/600 |
1.5 |
| 50 |
100 |
910/870 |
1.3 |
| 63 |
110 |
1090/1040 |
1.2 |
| 80 |
130 |
1310/1250 |
1.2 |
| 100 |
150 |
1580/1500 |
1.1 |
| 125 |
170 |
1890/1800 |
1.1 |
| 160 |
200 |
2310/2200 |
1.0 |
| 200 |
240 |
2730/2600 |
1.0 |
| 250 |
290 |
3200/3050 |
0.9 |
| 315 |
340 |
3830/3650 |
0.9 |
| 400 |
410 |
4520/4300 |
0.8 |
| 500 |
480 |
5410/5150 |
0.8 |
| 630 |
Dyn11
Yyn0 |
570 |
6200 |
0.6 |
| 800 |
700 |
7500 |
0.6 |
| 1000 |
830 |
10300 |
0.6 |
| 1250 |
970 |
12000 |
0.5 |
| 1600 |
1170 |
14500 |
0.5 |
| 2000 |
1550 |
18300 |
0.4 |
| 2500 |
1830 |
21200 |
0.4 |
NOTICE!
Important: To ensure that we deliver a product that flawlessly aligns with your requirements and surpasses your expectations, please provide the following information before placing your order:
1. Specify the type of prefabricated substation you require;
2. Provide the transformer model along with its capacity needs;
3. Detail the main wiring scheme for both your high and low voltage circuits;
4. Outline the specific types and parameters for any necessary electrical components;
5. Indicate your preferred shell color;
6. List the names, quantities, and any additional stipulations for spare parts and accessories;
Two-year warranty
More than three certifications
15 years of accumulated experience
Packaging & Shipping
Product Recommendation
ABOUT OUR COMPANY
Golden Triangle Power Technology Co., Ltd. (stock name: Golden Triangle; stock code: 837424), established in November 2009, stands as a luminary of innovation and proficiency in the field of power products. Our unwavering dedication is evident through meticulous research, groundbreaking development, and unmatched production capabilities. We proudly present a diverse range of advanced solutions, from three-dimensional coil core transformers and amorphous alloy core transformers to the revolutionary amorphous three-dimensional coil core transformers. Moreover, our extensive portfolio includes state-of-the-art photovoltaic substations, energy storage devices, high and low voltage switchgear, and an array of intelligent substations. As a vibrant production service-led company, we seamlessly integrate construction EPC, delivering excellence to sectors like State Grid, Southern Power Grid, railroads, mines, major infrastructure works, metallurgy, roads, bridges, and sophisticated real estate management systems-ensuring our products empower the backbone of modern infrastructure.
Golden Triangle sets itself apart with a prestigious array of certifications that emphasize our steadfast dedication to quality and excellence. These include ISO9001:2015 for quality management, ISO14001:2015 for environmental responsibility, and ISO45001:2008 for occupational health and safety. Our esteemed certifications also encompass the PCCC energy-saving product certification, the mandatory 'CCC' national product certification, and the respected CQC China quality certification. Our AAA credit rating underscores our financial credibility. As a nationally recognized high-tech enterprise, we are honored to be a provincial 'specialized, special, and new' SME and are ranked among the top 100 technological enterprises with outstanding growth potential in our province. Our accolades extend to recognition as a provincial scientific and technological SME and a municipal green factory. We operate advanced provincial high-tech enterprise R&D hubs, academician workstations, and an innovation workstation for doctors. Our robust intellectual property portfolio, boasting 3 invention patents and 51 utility model patents, showcases our passion for innovation and technological leadership.
Our pioneering products are prominently featured in the 'Energy Saving and People Benefiting Project' promotion catalog, as well as the 'Recommended Catalog of Energy Saving Electromechanical Equipment' compiled by the Ministry of Industry and Information Technology, the Ministry of Finance, and the National Development and Reform Commission. Golden Triangle proudly holds the distinction of being the inaugural power industry enterprise in Wenzhou to receive direct subsidies from the Ministry of Finance for product sales. Our products have been awarded national accolades, including national industrial energy-saving technical equipment products and the pioneering first set of products in vital provincial equipment manufacturing fields. Our commitment to exemplary production standards is showcased by the 'SCB13-RL solid triangle iron-core dry-type transformer' and 'SBH16-RL solid triangle rolled iron core amorphous transformer,' both recognized as 'Zhejiang manufacturing quality standards.' Our significant role in drafting 10 standards, such as the 'GB/T32825-2016 National Standard for Three-phase Dry-type Three-dimensional Wound Core Distribution Transformer,' highlights our unwavering commitment to energy conservation, emissions reduction, and advancing green energy technologies within China's power industry.
THE HONOR OF COMPANY
In the ever-shifting and fiercely competitive market landscape, Golden Triangle remains resolute in its core belief: 'quality is the enterprise life.' By diligently implementing the ISO9001:2000 international quality management system, we have embraced a quality policy focused on 'quality excellence, service perfection, and relentless quality improvement' to ensure unparalleled customer satisfaction. Our participation in the pioneering 'energy-saving and Huimin engineering energy-efficient distribution transformer' initiative, endorsed by the National Development and Reform Commission, Ministry of Finance, and Ministry of Industry and Information Technology, during its initial promotion, attests to our dedication to energy efficiency and excellence.
The exhibition we attended
Display area
SEVERAL PICTURES ABOUT COMPANY AND PRODUCTION
- Q: Are you manufacturer?
A: Yes, we are manufacturer. Our factory is in Wenzhou China
- Q: Can I get guarantee of products?
A: Yes, every product is 1 year quality warrantee under customer correct using the products.
- Q: Do you have any Certificate?
A: Yes. Each of our unit has CCC, ISO9001 certificate. All the electric parts with CE certificate, If you need any other Certificate, we can help you to get it.
- Q: How to buy it? What about the delivery?
A: Please contact me by email or online, let me know your situation, I will give you professional solution. We have shipping agent can choosing the cheapest and fastest delivery. FOB, CIF, C&F or EXW are no problem for us.
- Q: What's the payment terms?
A: For small testing orders, we can accept Waster union, T/T and Credit card.
For mass orders, we accept t/t and L/C.
- Q: What about the production?
A: Produce time is 4~6weeks.
- Q: Could you offer some spare parts?
A: Yes, no problem.
- Q: What about the maintenance?
A: All the goods past the test, maintenance is very easy.
Driven by an unwavering ethos of 'quality first, honest service, strict management, and striving for perfection,' Golden Triangle Electric Power Technology Co., Ltd. remains devoted to delivering top-tier technology, supreme quality, and outstanding service to our esteemed clients. We warmly welcome individuals from all walks of life to visit us for guidance and negotiations, fostering a spirit of mutual development. Our goal is to cultivate a 'win-win' relationship, where together, we co-create a promising future filled with endless possibilities!
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