SG and SBK series three-phase dry-type transformers are indoor air self-cooling type, suitable for circuits with AC 50HZ-60HZ and voltage below 1000V and 1000V. They are three-phase power transformers commonly used in general circuits or lighting, and can also be used as A- type power supply.
SG SBK series three-phase dry-type transformer can be made into start-up type and protection type, with low loss, low noise, good fire resistance and no pollution to the environment.

Model and meaning
SG and SBK series three-phase/dry-type isolation transformers are a new generation of energy-saving power transformers developed and produced by our factory on the basis of referring to similar international products and combining with China's national conditions. From 100VA to 1000KVA, they conform to JB5555-1991 JB/T55555-2001 GB19212.1-2003 JB/T9529-1999, national standards and international CE certification. The windings are wound in full train. The transformer is vacuum impregnated to make the insulation grade of the transformer reach F or H grade, product performance has reached the advanced level at home and abroad. Three-phase dry-type isolation transformers are widely used in circuits with AC 50HZ to 60HZ and voltage below 660V. They are widely used in imported important equipment, precision machine tools, mechanical and electronic equipment, medical equipment, rectifier devices, lighting factories, industrial and mining enterprises, stations, docks, airports, etc. The various input and output voltages of the product, the connection group, the number and position of the adjustment tap (generally ± 5%), the distribution of winding capacity, the provision of secondary single-phase windings, the use of rectifier circuits, and whether or not to require a shell, etc., can be carefully designed and manufactured according to the requirements of users.

Product Features
The isolation transformer converts the three-wire △ connection into a four-wire Yo system. The shielding further eliminates the noise of high-frequency pulse interference from the transformer. Although the shielded isolation transformer can effectively prevent the interference (pulse and high-frequency noise) from various N-G, the transformer must be properly grounded, very strict, otherwise the anti-common mode interference will have no effect. Our factory can design and produce high-quality isolation transformers for customers.

Technical indicators
1. Input rated voltage: three-phase 380V, three-phase 220V
2. Input and output voltage: (according to customer requirements)
3. Work efficiency: 50HZ-60HZ
4. Efficiency: ≥ 95%
5. Temperature rise:<60
6. Waveform distortion:<0.1%
7. High voltage test: 0.5mA/3800V/one minute without breakdown
8. Insulation resistance: winding-to-ground insulation resistance ≥ 500MΩ primary-to-secondary insulation resistance ≥ 500MΩ

Characteristic advantages
1. High isolation
2.N-G good performance
3. High degree of common mode interference suppression
4. Convert △ to Y or Y to △
5. Voltage tap easy to change
6. According to the user's special performance requirements design

Conditions of use
1. Applicable altitude: ≤ 5000m
2. Ambient temperature:-15 ℃ ~ 45 ℃
3. Relative humidity: ≤ 90%
4. The installation site should be free of gas, steam, chemical deposition, dirt, conductive dust and other explosive, flammable and corrosive substances that seriously affect the insulation strength of the transformer.
5. Those who do not meet the above conditions of use shall be determined through consultation with us.

This product is small in size, beautiful in appearance, very popular with all kinds of machinery manufacturers welcome to use, SG-20KVA, SG-50KVA, SG-100KVA, SG-500KVA, etc., according to the voltage of the user's electrical appliances, the above shell and table air switch according to the size and custom.