General (SG 3 Phase auto transformer)

SG series three - phase dry type auto transformer refers to a kind of transformer,its primary and secondary windings in the same winding. The primary and secondary windings are directly connected in series and self coupled. According to the structure, it can also be subdivided into adjustable voltage type and fixed type. Auto-coupling means electromagnetic coupling. Ordinary transformers transfer energy through electromagnetic coupling of the original and secondary side coils. The original and secondary sides have no direct electrical connection. The original and secondary sides of an autotransformer have direct electrical connection. Its low-voltage coil is part of the high-voltage coil. Protection equipment such as autotransformer will also be used in the protection equipment of communication lines.

Working conditions (SBK series three-phase dry type isolation transformer)

The transformer could operate unfailingly under following condition.

1. Sea level altitude is lower than 2500M

2. Air temperature: not higher than 40ºC, and not lower than -25 ºC

3. Relative humidity: monthly average humidity is 90%.

4. A medium of no explosion hazard in where no air might corrode metal and destroy insulation, or no conductive dust existing.

5. A place of no weather effect.

Precautions

Before purchase, please estimate total capacitance of applicable electric appliance, and choose transformer that has equivalent capacitance to prevent transformer from burning of instantaneous startup.

1. The transformer is designed and produced strictly according to relevant national standard. When using duplex winding and multi-control voltage (tap style), such as BK, JMB transformer please respectively reduce capability according to max voltage radio of primary and secondary voltage, namely, current may not exceed calculated value of max voltage; For transformer that adopts winding to divide power capacity, it is necessary to control power capacity of each winding strictly to prevent transformer from burning. For configuration and character of winding, please refer to figure 1.

2. Before installation, please check if all data listed on nameplate meet your requirement, and perform installation after confirmation.

3. After electrified, radiation (the temperature should not exceed 80℃ ) with iron core and coil of transformer is normal. If the temperature exceed 80℃, or condition of smoking occurs, please shut off power, check capacitance of electric appliance, and adjust it.