What is the use of a power transformer?Power transformers are of vital importance in the power system. Their core function is to efficiently and safely transmit and distribute electrical energy. If you need power transformers, please contact our company.

I. Core Function: Voltage Conversion 

Upgrading (from power plants to transmission lines) 
Question: The voltage of the electricity generated by power plants is relatively low (usually 10 to 35 kV). If it is transmitted over long distances directly, the current will be too high, which will cause severe heating of the lines and energy loss (the loss formula: P_loss = I^2 * R). 
Solution: The transformer raises the voltage to 110kV to 1000kV, achieving ultra-high voltage. This significantly reduces the current and minimizes transmission losses (for example, if the voltage is increased by 10 times, the current drops to 1/10, and the loss reduces to 1/100). 
Effect: Achieve efficient cross-regional transmission of electrical energy (for example, transferring energy from the Three Gorges Hydropower Station to Shanghai). 
2. Voltage reduction (transmission lines → users) 
Question: Ultra-high voltage electricity cannot be directly used by households or factories (it would damage the equipment). 
Solution: The transformers used in substations reduce the ultra-high voltage to 10kV to 35kV (medium voltage) for the urban power grid; the distribution transformers in residential areas further reduce the voltage to 220V/380V (low voltage) to ensure safe connection to households. 
Effect: Adapts to the requirements of various electrical devices (mobile phone charger: 5V, machine tool: 380V). 

II、Key Value 

1.Energy conservation and consumption reduction: Increasing the voltage for power transmission reduces line losses by approximately 60% to 70%, which is the foundation for the efficient operation of the power grid. 

2. Safe Electricity Usage: Convert dangerous high-voltage electricity into safe low-voltage electricity to avoid the risk of electric shock. 
3. Grid Interconnection: Different voltage levels of power grids are connected through transformers to form a unified national power grid (such as China's ultra-high voltage power grid). 
4. Isolation protection: Isolates the primary/secondary circuits to prevent the spread of fault current and protect the downstream equipment. 

III. Analysis of Technical Principles 

1.Law of Electromagnetic Induction: 
The primary coil is supplied with alternating current → a changing magnetic field is generated → the secondary coil cuts through the magnetic field lines → an induced voltage is produced. 
Voltage ratio = Number of coil turns ratio. By adjusting the number of turns, the voltage can be changed. 
2.No mechanical movement: Energy is transmitted through a magnetic field, with an efficiency of over 98%, far exceeding that of mechanical conversion methods.