basic structure:
Power transformers are mainly composed of iron cores and coils. Among them, the iron core is made of laminated silicon steel sheets with high magnetic permeability, which is used to concentrate the magnetic field and conduct magnetic induction lines. The coil is divided into two parts, one is the input coil (also called the primary coil), and the other is the output coil (also called the secondary coil). The coil is wrapped with insulating material to prevent current leakage.
working principle:
The working principle of power transformers is based on the law of electromagnetic induction. When AC current is passed through the high-voltage winding, the generated magnetic field will induce electromagnetic lines of force in the iron core, which in turn induces current in the low-voltage winding. According to the law of electromagnetic induction, the relationship between the current and the magnetic field in the high-voltage winding can be expressed by the formula U1=N1*dΦ/dt, where U1 is the high-voltage winding voltage, N1 is the number of high-voltage winding turns, Φ is the magnetic flux, and dt is the differential of time. According to this formula, when the high-voltage winding voltage or the number of turns of the high-voltage winding changes, the magnetic flux will also change, causing the voltage in the low-voltage winding to change.
Classification:
1. Classification according to voltage level: According to the rated voltage level of the transformer, it can be divided into high-voltage transformer, medium-voltage transformer and low-voltage transformer.
2. Classification according to use: According to the use of transformers, they can be divided into transmission transformers, distribution transformers and industrial transformers.
3. Classification according to cooling method: According to the cooling method of the transformer, it can be divided into natural cooling transformer and forced cooling transformer. Free-cooled transformers dissipate heat through natural convection, while forced-cooled transformers dissipate heat through fans or water cooling systems.
4. Classification according to winding structure: According to the winding structure of the transformer, it can be divided into single-phase transformer and three-phase transformer. Single-phase transformers are suitable for small-capacity applications, while three-phase transformers are suitable for large-capacity applications.
5. Classification according to wiring method: According to the wiring method of the transformer, it can be divided into star connection and delta connection. Star connection is suitable for symmetrical loads, while delta connection is suitable for asymmetrical loads.
Power supply:
There are two power supply modes of power transformers: single-phase power supply and three-phase power supply. Single-phase power supply is suitable for single-phase loads, such as residential electricity. Three-phase power supply is suitable for large industrial and commercial power supplies and can provide greater power.
power transformer
