Introduction: An isolation transformer is a special type of transformer whose main function is to isolate the input circuit from the output circuit, helping protect equipment and personnel from electrical interference and electric shock.
CHBEB GROUP has focused on transformer manufacturing for 60 years. Its products cover various types of transformers, including oil-immersed transformers and dry-type transformers, meeting the needs of industrial, renewable energy, power distribution, and other applications. CHBEB specializes in manufacturing various types of three-phase dry-type isolation transformers. Click the link to learn more about our products.
Isolation means that the primary and secondary windings of the transformer are electrically insulated from each other. Transformer isolation separates the current paths of the primary and secondary windings. There are many forms of isolation.
For common low-voltage transformers, the metal winding wires are usually coated with insulating varnish, and then the primary and secondary windings are wound on the same iron core to form a transformer. The wire used for these windings is commonly referred to as “enameled wire” because of the insulating varnish coating. In this case, the primary and secondary windings are insulated from each other by this layer of varnish, thereby achieving isolation.
The working principle of an isolation transformer is the same as that of an ordinary dry-type transformer. It also operates based on the principle of electromagnetic induction. Its main function is to isolate the primary power supply circuit, while the secondary circuit is floating with respect to ground, thereby ensuring electrical safety.
The applications of isolation transformers focus on the needs of “safety protection” and “interference suppression,” covering high-risk or highly sensitive scenarios:
In terms of safety protection, isolation transformers play a significant role. They can effectively isolate the power grid from electrical equipment, thereby greatly reducing the risk of electric shock. In daily life and industrial production, electric shock accidents occur from time to time, and isolation transformers can help prevent such accidents. For example, the typical household voltage is 220 V. After using an isolation transformer, even if a person accidentally comes into contact with the secondary circuit, because there is no direct electrical connection between the secondary and primary sides, the current passing through the human body will be very small and almost negligible, providing maximum protection for personal safety. According to relevant statistics, in places where isolation transformers are used correctly, the incidence of electric shock accidents can be reduced by more than 80%.
In addition, isolation transformers can also provide interference suppression. In complex electrical environments, various interference signals exist in the power grid, which may affect the normal operation of electronic equipment. For example, if precision testing equipment in hospitals or equipment in communication rooms is affected by grid interference, it may lead to inaccurate test results or communication failures. Through their electromagnetic characteristics, isolation transformers can effectively suppress common-mode interference, allowing connected equipment to operate in a relatively stable power supply environment. Practical experience shows that after using isolation transformers, the failure rate of electronic equipment caused by grid interference can be reduced by 60%–70%.
Moreover, isolation transformers can also flexibly adjust voltage. According to actual requirements, isolation transformers can transform the output voltage. Different application scenarios require different voltage levels. For example, some industrial equipment may require a specific lower voltage for operation, and an isolation transformer can easily achieve step-down transformation. In certain special experimental environments, a higher voltage may be required, and an isolation transformer can also meet this requirement.
Three-phase dry-type isolation transformers are one of CHBEB’s flagship products. Manufactured with high-quality materials and advanced process technologies, they offer advantages such as moisture resistance and easy maintenance. They can be installed close to load centers and are suitable for power transmission and distribution applications in subways, high-rise buildings, airports, stations, ports, enterprises, tunnels, and other locations.
Three-phase dry-type isolation transformers not only provide voltage transformation in the power grid, but can also isolate third harmonics from the grid to the equipment, helping protect machines from overheating and reducing the impact on the service life of insulating materials. They are particularly suitable for imported equipment.
Available voltage configurations include 380 V input → 220 V output, 380 V input → any required output voltage, and 220 V input → any required output voltage. The capacity range is from 1 kVA to 1000 kVA, suitable for various AC 50–60 Hz power supply applications with voltages not exceeding 500 V.
Product input and output voltages, voltage levels, connection groups, tap positions, winding capacity distribution, secondary winding configuration, and whether an enclosure is required can all be carefully designed and manufactured according to customer requirements.
|
Model (kVA) |
Overall Dimensions L × W × H (cm) |
Mounting Dimensions (cm) |
Enclosure Dimensions L × W × H (cm) |
Transformer Weight (kg) |
|---|---|---|---|---|
| SG-10 | 42×21×42 | 135×310 | 70×35×77 | 90 |
| SG-20 | 52×24×52 | 155×400 | 70×35×77 | 180 |
| SG-30 | 55×28×65 | 165×400 | 80×40×87 | 220 |
| SG-40 | 61×30×65 | 170×400 | 80×40×87 | 265 |
| SG-50 | 61×30×65 | 175×400 | 100×50×104.5 | 295 |
| SG-60 | 70×32×66 | 190×450 | 100×50×104.5 | 370 |
| SG-70 | 70×32×66 | 190×450 | 100×50×104.5 | 400 |
| SG-80 | 70×35×67 | 195×450 | 100×50×104.5 | 450 |
| SG-100 | 75×35×68 | 210×450 | 100×50×104.5 | 490 |
| SG-120 | 75×35×68 | 215×450 | 100×50×104.5 | 520 |
| SG-150 | 85×37×68 | 230×450 | 120×65×114.5 | 650 |
| SG-200 | 95×45×68 | 290×450 | 120×65×114.5 | 850 |
| SG-250 | 95×45×83 | 290×450 | 120×70×124.5 | 1080 |
| SG-300 | 105×45×95 | 290×450 | 120×70×124.5 | 1350 |
High-Quality Silicon Steel Sheets
High-quality silicon steel cores produced by leading steel manufacturers in the industry are used. They are assembled with large-scale equipment using advanced processes, providing high magnetic permeability and lower core losses.
Pure Oxygen Coil
Class H enameled wire is used, with specially wrapped conductors capable of withstanding temperatures up to 180°C, helping extend the service life of the equipment.
Corrosion-Resistant and Durable
Metal structural components are treated with electroplating and baking paint processes, providing durability, corrosion resistance, and an attractive appearance.
Multi-Ventilation Design
A multi-vent design combined with powerful fan cooling provides better transformer protection and helps extend service life.
Three-phase dry-type isolation transformer diagram
CHBEB’s three-phase dry-type isolation transformers are suitable for AC 50–60 Hz circuits with voltages below 2000 V and can be widely used in precision machine tools, mechanical and electronic equipment, medical equipment, rectifier devices, lighting, and other applications. Product input and output voltages, connection groups, regulating taps, winding capacities, enclosure configurations, and other parameters can all be designed and manufactured according to actual application requirements.
A reliable dry-type isolation transformer depends not only on product parameters, but also on raw materials, design capabilities, manufacturing processes, and quality control. CHBEB GROUP has more than 60 years of transformer manufacturing experience and insists on using silicon steel sheets, copper wire, insulation materials, and electrical accessories supplied by high-quality industry suppliers. Through standardized winding, insulation treatment, assembly, and factory testing, quality is controlled throughout the entire production process.
Relying on its Beijing R&D center and production bases in Yueqing, Zhejiang and Nanjing, Jiangsu, CHBEB can provide transformer solutions covering product selection, technical design, and manufacturing according to the actual requirements of different countries, industries, and projects.
If you are looking for a three-phase dry-type isolation transformer suitable for your project, or have specific requirements for capacity, voltage, winding configuration, enclosure design, or other customized parameters, please contact us. CHBEB can provide selection recommendations, technical solutions, and quotation support based on your actual application conditions and technical requirements, helping you determine a suitable transformer solution more efficiently.
Before purchasing, first estimate the total capacity of the electrical equipment you will use, and select a transformer with the same capacity to ensure that the transformer will not be damaged during instantaneous startup.
Before installation, carefully check whether all data listed on the nameplate meet your requirements. Installation and use should only proceed after confirming that all information is correct.
After the transformer is energized, heating of the transformer core and coils is normal, provided that the temperature rise does not exceed 80°C. However, if the temperature rise is abnormal or the transformer begins to smoke, the power switch should be turned off and the capacitor capacity being used should be checked again.
During transportation, impacts should be avoided as much as possible, and the transformer must not be exposed to moisture. During use, proper maintenance should be carried out to ensure the service life of the transformer.
Yes. Users can request customized special transformer products. The product dimensions may change accordingly or can be determined through consultation based on user requirements.
