Main Functions And Features
1. The transformer core is made of imported high-quality cold-rolled silicon steel sheet, which greatly reduces no-load loss and no-load current. The core is tightly bound to ensure the compactness and reduce noise.
2. The high and low voltage windings are made of oxygen-free copper. The low voltage winding of 500KVA and below is of double-layer cylinder structure, of 630kVA and above adopt double helix or four helix structure. High-voltage winding adopts multi-layer cylinder structure.
3. Dyn11 is used in the transformer connection group to reduce the influence of harmonics on the power grid and improve the quality of power supply.
4. The transformer is a fully sealed structure, with three coats of primer and one coat of finish paint applied on the inner and outer surfaces. The product is salt fog proof, moisture proof and fungus-proofing, beautiful, durable and reliable
5. The measured noise value is lower than the standard and maintenance free under normal operation.
Transformer Structure
20kV Power Transformer Table parameter
| (KVA)Rated capaci | Voltage Combination | Connection Group Symbol | No-load Loss(W) | Load Loss (W)75ºC | No-load Current (%) | Short-circuit Impedance(%) | ||
| High Voltage (KV) | Tapping ranges of High Voltage | Low Voltage(KV) | ||||||
| 30 | 20 | ±5% ±2×2.5% | 0.4 | Dyn11 Yzn11 Yyn0 | 100 | 690/660 | 2.1 | 5.5 |
| 50 | 130 | 1010/960 | 2.0 | |||||
| 63 | 150 | 1200/1150 | 1.9 | |||||
| 80 | 180 | 1440/1370 | 1.8 | |||||
| 100 | 200 | 1730/1650 | 1.6 | |||||
| 125 | 240 | 2080/1980 | 1.5 | |||||
| 160 | 290 | 2540/2420 | 1.4 | |||||
| 200 | 340 | 3000/2860 | 1.3 | |||||
| 250 | 400 | 3520/3350 | 1.2 | |||||
| 315 | 480 | 4210/4010 | 1.1 | |||||
| 400 | 570 | 4970/4730 | 1.0 | |||||
| 500 | 680 | 5940/5660 | 1.0 | |||||
| 630 | 810 | 6820 | 0.9 | 6.0 | ||||
| 800 | 980 | 8250 | 0.8 | |||||
| 1000 | 1150 | 11330 | 0.7 | |||||
| 1250 | 1380 | 13200 | 0.7 | |||||
| 1600 | 1660 | 15950 | 0.6 | |||||
| 2000 | 1950 | 19140 | 0.6 | |||||
| 2500 | 2340 | 22220 | 0.6 | |||||
Our Workshop
Company Introduction 
1.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. .
2.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.
3.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.