35KV Oil immersed transformer
Product introduction
On the basis of S9 series, the no-load loss of S11 series products is reduced by 30% on average, and the no-load current is 70-80% lower than that of S9. The core is made of imported high magnetic conductivity, low loss, cold-rolled high-quality silicon steel sheet, which reduces the no-load loss and saves energy significantly.
High safety and reliability, advanced structure, small volume, light weight, low noise, low temperature rise, anti-corrosion, reliable anti leakage measures, to prevent oil leakage.
Product advantages
- All of them are made of high quality grain oriented cold-rolled silicon steel sheets. The iron core is of multi-stage stepped structure, with three or five joints, low air loss and low noise; The coil core is directly wound by special equipment, without joint and angle weight, reducing magnetic resistance and low air loss; The amorphous alloy transformer core is a kind of higher quality core material. Compared with the traditional silicon steel sheet, the average air loss is reduced by 72%, and the no-load current is 50%.
- It is made of high-quality QQ acetal enamelled round copper wire and flat copper coin drawn by oxygen-free copper rod. Its forms include cylinder type, continuous type, new spiral type, split type, etc. it has sufficient electrical strength, mechanical strength and heat dissipation capacity. In order to increase the short-circuit resistance of transformer, higher quality self-adhesive transposed conductor can be used. The coil is made of self-adhesive acetal enamelled flat wire. After being wound into a coil, the enamelled flat wires are mutually bonded to form a rigid coil, which can withstand greater bending stress, thus enhancing the short-circuit resistance of the transformer. The biggest characteristic of the self-adhesive transposed conductor is that it can reduce the loss of the transformer. Because of the multi split conductor and transposition, it can greatly reduce the eddy current loss and circulation loss, reduce the temperature rise of the hot spot of the winding, and make the temperature distribution of the whole winding more uniform.
- It is welded with high-quality steel plate and has elliptical and rectangular structure. The radiator element is chip radiator, expansion radiator or corrugated oil tank. The oil tank has reliable sealing test in the factory. After pickling and phosphating treatment, the inner and outer surfaces are sprayed with three times of primer and one time of finish paint. The product is salt fog proof, damp heat proof and mould proof, which can meet the requirements of metallurgy, petrochemical system and humidity . special requirements for polluted areas, beautiful and reliable operation.
Transformer Structure
Note: Due to continuous product improvement, the dimensions provided in this sample are for reference only. If necessary, our company can design and produce according to user requirements. Please contact the company in time.
| Rated Capacity (kVA) | H.V. winding (kV) | Tapping range of high voltage (%) | L.V. winding (kV) | Vector Group | No-Load Loss(W) | Load Loss (W) | No-load current (%) | Short-circuit impedance (%) | |
| 50 100 125 160 200 250 315 400 500 630 800 1000 1250 1600 2000 2500 | 35 38.5 | ±5% ±2x2.5% | 0.4 | Dyn11 Yyn0 | 130 185 215 225 270 320 385 465 545 665 785 920 1120 1350 1590 1890 | 1200/1140 2010/1910 2370/2260 2820/2680 3320/3160 3950/3760 4750/4530 5740/5470 6910/6580 7860 9400 11500 13900 16600 19700 23200 | 1.3 1.10 1.10 1.00 1.00 0.95 0.95 0.85 0.85 0.65 0.65 0.65 0.6 0.6 0.55 0.55 | 6.5 6.5 6.5 6.5 6.5 6.5 6.5 6.5 6.5 6.5 6.5 6.5 6.5 6.5 6.5 6.5 |
Our Workshop
Company Introduction 
Qingdao Hengfengyou Electrical Engineering Co., Ltd. (hereinafter referred to as Hengfengyou) is a large-scale enterprise group with electricity transmission and distribution as its main business,which integrates scientific research, development, manufacturing and trade. After 30 years rapid economy development in China, Hengfengyou now is a leading R & D, manufacturing and service base for MV
, HV and ultra-HV power distribution equipment in China. At present,we have 50 senior technicians and more than 300 employees, with a complete sales and service system. Our products sell well at home and abroad, and our annual output value adds up to $100 million. .
At present, Hengfengyou has 6 wholly-owned and holding subsidiaries, which are respectively engaged in R & D, manufacturing and service of transformers, switchgear, package/unit substation, pole-mounted high-voltage vacuum circuit breakers, new energy, and electrical engineering.
For a long time, the company has maintained close technical exchanges and cooperation with domestic and foreign universities, scientific research institutes and electric power enterprises.
Hengfengyou independently designed and developed SCB series dry-type transformer and SC series oil immersed transformer. Our product performs with high operation efficiency, and obvious energy conservation. The overall performance index reaches the world's advanced level.
The company also maintains long-term strategic partnership with Schneider, ABB, Simens, Chint and other electric suppliers. We absorbed foreign advanced experience in electrical equipment production and independently designed and developed a series of substation equipment, which realized the automation and intelligence of the substation, and of which the performance has been highly recognized by the user at home and abroad. In the following five years, the company plans to build an intelligent workshop with an annual output of 100000 transformers.Then,the intelligent robot will replace 80% of the existing labor force, which will greatly improve the production efficiency, lower production cost, and produce more energy-saving, environmentally friendly, more safe and reliable the product for the users!
HFY Certificate 
Our Services
1.Pre sale service A. make technical solution B. send quotation, technical data sheet and drawing prepare power transmission plan, testing plan and shipment plan
2. In sale service supervise the manufacturing schedule totally in accordance with the plan b. send photos to customer during every manufacturing process(hold point) c. inform the customer one week before testing. d. quick response within 12 hours any time.
3. After sale service a.All parts are under Two Years Warranty with defects from manufacturer. All spare parts and component can be offered for free from the original manufacturer or HFY. b. Training We will provide free training to your technician free of charge at our factory site in Qingdao, China. The total training period would be 2 working days. All travel and related expensed would be at the purchaser's expense. c. Technical Documents: Original operation and service manuals, the service manual is completed with wiring diagram, block diagram and trouble shooting information. d. Installation Usually, clients can do the installation and operation by themselves when following the detailed English user manual. If clients want our technician do this work, please read the following terms: The initial installation is not included with the professional HFY team member. All installation with the Hengfengyou team must be scheduled at least 4 weeks in advance before actual trip taken. All necessary connectivity must be ready prior the service being scheduled. While Hengfengyou team member arrives at the site for a complete and final installation, two days training course will be provide to the customer for operation and maintenance procedure. The initial installation is provided within 5 working days excluding travel days. The actual installation days may vary, based on different machine mode. Each day of working hour consist at 8 working hours. Any additional day will be charge according to our service fee listed below. When initial installation is being called for the Hengfengyou team required, the surcharge will be made in advance by the purchase at US$100/person/day plus all travel expenses. Travel expenses; local and destination transportation charges (air, train, ferry, bus, taxi or any means of transportation required to arrive to/from destination); accommodation (minimum of 3 star hotel facility) and 3 daily meals.
The Finished Project
Team Show
FAQ
Q1: Is OEM/ODM available?
A1: Yes, it is! Our products can be Customized. We have design and engineer teams,we can customize products according to customers' drawing or requirements.
Q2: What's your MOQ?
A2: One Set.
Q3: How is the delivery time?
A3: It depends your order quantity and it normally takes about 15-20 days.
Q4: How do you control the quality?
A4: We have QC team comply with TQM to ensure the quality. Each step is in compliance to the standards. At the same time, we will take photos and shoot video for you if you need.Every product will be fully assembled and carefully tested before packing and shipping.
Q5: How long is the warranty?
A5: Within one year from the sale date, if there are any accessory problems, you just provide the photos of damaged accessory, then we will provide free accessory. According to the number of products, we will provide easily damaged accessories for free. We also can provide technical support if you need.