Autotransformer
1.Scope of application
Autotransformer is an electric power device that realizes voltage conversion on the same winding for primary and secondary. Different taps are used to realize voltage increase and voltage reduction. The voltage of the tap with less than the common coil is reduced, and the voltage of the tap with more than the common coil is increased. Usually, there are 2 to 3 sets of taps on the secondary side of the autotransformer, such as the secondary voltage is 80%, 65%, 40% of the primary voltage, etc.
Autotransformers can be divided into voltage regulating type and fixed type according to their structure. The primary and secondary windings have the dual characteristics of electromagnetic coupling and direct conduction. Compared with ordinary transformers, their structure is more compact, with lower loss and high efficiency, and they are suitable for scenes without electrical isolation.
2. Operation environment
1) Altitude: ≤1000 meters.
2) Ambient temperature: Maximum +45oC, Minimum -30oC.
3) Relative humidity: ≤90% (+25 oC).
4) Max Ground ramp degree: ≤3°.
5) Seismic level: ≤0.3m/s2 at horizontal direction and ≤0.15m/s2 at vertical direction.
6) Installation environment: No obvious and heavy pollution, no explosive and corrosive gas and dust, with good air ventilation and no severe vibration and shock.
7) If the application environment is different from the above standard conditions, please contact for customized designs.
3. Product advantages:
1)High efficiency and energy saving
The shared winding design reduces copper loss and iron loss, and improves energy conversion efficiency by 10%-20%.
2)Compact structure
The volume and weight are only 60%-70% of ordinary transformers of the same capacity, saving installation space.
3)Flexible voltage regulation
Multi-level voltage output (such as 80% and 60% tap voltage reduction) can be achieved through tap design to meet different needs.
4)Cost advantage
The material usage is reduced by about 30%, and the manufacturing cost is significantly reduced.
5)Overload capacity
It can withstand 2 times the rated current for 1 minute, which is suitable for short-term high-load scenarios.
4. Applications
1)Voltage adaptation
Convert grid voltage differences (such as 380V to 220V) to match imported equipment or regional grid requirements.
2)Motor start control
Reduce the motor starting current to 1/K² times of direct start (K is the transformation ratio) to protect the stability of the grid.
3)Power system regulation
In 220kV and above high-voltage grids, it is used as a connecting transformer to optimize the transmission efficiency.
4)Industrial equipment power supply
Provide stable voltage for production lines and medical equipment (such as CT machines) to ensure safe operation of equipment.
