When selecting materials for K-factor transformers, it is generally forbidden to use low-temperature wires with low-density insulation such as silk-covered wires. Enameled copper wires or NOMAX copper wires above 180°C should be used to prevent as much as possible the internal collection of wires due to higher harmonics. The skin effect produces local high temperature damage to the insulating layer, which leads to breakdown of the insulating layer and damage to the transformer. The K-factor transformer is designed to reduce the thermal effect as much as possible, which can be achieved through the optimization of the coil design, the thickness-to-width ratio of the wire specification, and the number of parallel coils.
The design impedance of the K-factor transformer must select an appropriate impedance value, use low-loss ultra-thin silicon steel sheets, and the magnetic density should be lower than the design value of ordinary transformers, process production to enhance the structural strength, and reduce the thermal effect of the transformer zero sequence current at the neutral point. , High frequency heat addition effect and output side winding heat addition effect, etc.
Main data
| Product Name | Three phase Isolation transformer |
| Product Model | SG/QZB/SBK/Power transformer/ZSG/SBDG/EPS UPS |
| Winding Material | Enameled copper wire or enameled aluminum wire |
| Capacity | 100VA~5000KVA |
| Input Voltage | 415V or customized |
| Output Voltage | 380V or customized |
| Frequency | 50/60Hz |
| Connection Type | DYN11/YYN0 |
| Insulation Level | F/H |
| Enclosures Protection Level | IP00 or higher |
| Pressure-tight Test | 2500V/min |
| Insulation Resistance | >100MΩ |
| Ground Resistance | 25A<100milliohm |
| Induction Withstand Voltage Test | 125Hz / 830V / 60s |
| Cooling Method | Natural or air cooling |
| Temperature Rise | ≤115K |
| Transformation Ratio | <3% |
| Air Carrying Current | <3% |
| Impedance Voltage | about 4.5% |
| Total Losses | 4% |
| Efficiency | 80%--99% |
| Operating Temperature | -15℃～40℃ (40℃, 90%R.H., 56days) |
| Storage Temperature | -25℃～100℃(40℃, 90%R.H., 56days) |
| Certificate | CE,ISO |
| The technical parameter for reference only, for exactly technical information, please feel free to contact us! |
Production process
FAQ
1. Q: Can I have a sample order?
A: Yes, we welcome sample order to test and check quality.
2. Q: What is the lead time?
A: Sample time 3-7 days, we usually ship by DHL, UPS, FedEx,etc. Mass production time 7-25 days.
3. Q: How long is the warranty?
A: 24 monthes from B/L. If there are any accessory problems,just provide the photos of damaged accessory,then we will provide free service. According to the number of products,we will provide easily damaged accessories for free. we also can provide technical support if you need.
4. Q: Is OEM/ODM available?
A: Yes,it is! We are manufacturer with our own R&D team, we can customize products according to customer's drawing or requirements.
Customized services:
a. Customized color and special function.
b. Customized box.
c. Print customer's logo(MOQ:≥10pcs).
d. Your other ideas about product, we can help you design and put them into production. The above customized services must be confirmed before production.
5. Q: How to control the products quality?
A: Our company owns the core technology ,all kinds of products hold CE certificate. We have professional engineers. Workers are strictly required to make products according to the drawings. Each process has technical instructors.The QC supervisors will regularly inspect the production. We will do products performance tests during production, and comprehensive quality tests when the products is completed.
