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, a marvel of modern engineering in the realm of 3-phase oil-immersed distribution transformers. This cutting-edge equipment is crafted with precision to deliver exceptional energy efficiency and significantly reduce energy loss. It guarantees superior performance for all your electrical distribution demands. Experience a new standard of reliability and long-lasting durability, making it the ideal choice for today's sophisticated 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: Kindly provide the following essential details before placing your order. This will enable us to deliver a product that not only meets but surpasses your expectations and requirements:
1. The specific type of prefabricated substation required;
2. The transformer model along with its capacity specifics;
3. The primary wiring scheme details for both high and low voltage circuits;
4. Comprehensive specifications and parameters of any required electrical components;
5. Your preferred color choice for the shell;
6. The names, quantities, and any additional specifications for spare parts and accessories needed;
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) was founded in November 2009 and stands as a beacon of innovation and expertise in the power products arena. Our unwavering dedication is reflected in our meticulous research, pioneering development, and unparalleled production of cutting-edge power solutions. Revel in our diverse portfolio, featuring advanced three-dimensional coil core transformers, amorphous alloy core transformers, and the trailblazing amorphous three-dimensional coil core transformers. Our extensive offerings include state-of-the-art photovoltaic substations, energy storage equipment, high and low voltage switchgear, and a comprehensive range of intelligent substations. As a dynamic production service-driven enterprise, we masterfully integrate construction EPC, serving a vast array of sectors like State Grid, Southern Power Grid, railways, mines, expansive infrastructure projects, metallurgy, roads and bridges, as well as sophisticated real estate management systems. Our products are the backbone of modern infrastructure, supporting societal progress.
Golden Triangle proudly distinguishes itself with an extensive suite of prestigious certifications, a testament to our unwavering commitment to quality and excellence. We hold ISO9001:2015 for quality management, ISO14001:2015 for environmental stewardship, and ISO45001:2008 for occupational health and safety. Our certifications extend to the PCCC energy-saving product certification, the essential 'CCC' national mandatory product certification, and the esteemed CQC China quality certification. Our sterling AAA credit rating attests to our financial integrity and stability. As a celebrated national high-tech enterprise, we are recognized as a provincial 'specialized, special and new' SME, ranking among the top 100 technological enterprises with outstanding growth potential in our province. Our accolades include being recognized as a provincial scientific and technological SME and a municipal green factory. We operate sophisticated provincial high-tech enterprise R&D centers, academician workstations, and a doctor innovation workstation. Our intellectual property portfolio is robust, boasting 3 invention patents and 51 utility model patents, showcasing our relentless dedication to innovation and technological leadership.
Our innovative products proudly feature in the 'Energy Saving and People Benefiting Project' promotion catalog, as well as the 'Recommended Catalog of Energy Saving Electromechanical Equipment,' curated by the Ministry of Industry and Information Technology, the Ministry of Finance, and the National Development and Reform Commission. Golden Triangle holds the distinguished honor of being the first power industry enterprise in Wenzhou to receive direct subsidies from the Ministry of Finance for product sales. Our products are celebrated with national titles, including national industrial energy-saving technical equipment products and pioneering first set products in key provincial equipment manufacturing fields. Our adherence to exemplary production standards is evident with products like 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 pivotal role in drafting 10 standards, such as the 'GB/T32825-2016 National Standard for Three-phase Dry-type Three-dimensional Wound Core Distribution Transformer,' underscores our unwavering commitment to promoting energy conservation, reducing emissions, and advancing green energy technologies within China's power industry.
THE HONOR OF COMPANY
In the ever-evolving, fiercely competitive market landscape, Golden Triangle remains resolutely committed to the core belief that 'quality is the enterprise life.' By rigorously implementing the ISO9001:2000 international quality management system, we have enshrined a quality policy centered on 'quality excellence, service perfection, and relentless quality improvement' to ensure unparalleled customer satisfaction. Our inclusion 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 inaugural promotion, stands as a testament to our commitment 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!
Audited Supplier 
){kind=link}