What transformer specifications and model? Specifications and models of how to develop it?
 
First, the classification
Cooling by Category: Dry (from cold) transformers, oil (from cold) transformer, fluoride (evaporative cooling) transformer.
 
Moisture-proof way by Category: Open-type transformers, potting transformers, sealed transformers.
 
Press the core or coil construction Category: core-type transformer (insert core, C-core, ferrite core), shell-type transformers (insert core, C-core, ferrite core). toroidal transformers, transformer metal foil.
 
Press the Power Phase Classification: single-phase transformers, three-phase transformer, multi-phase transformer.
 
By Application: power transformers, voltage transformers, audio transformers, intermediate frequency transformers, high frequency transformers, pulse transformers.
 
Second, the characteristic parameters of the power transformer
 
1, the operating frequency
Large transformer core loss versus frequency, it should be based on frequency of use to design and use, this frequency, said operating frequency.
 
2, the rated power
At a frequency and a predetermined voltage, the transformer can work long-term, without exceeding the specified temperature rise of output power.
 
3, rated voltage
It refers to the winding of the transformer that allows voltage applied, shall not be greater than a predetermined value at work.
 
4, the voltage ratio
It refers to the ratio of the transformer primary and secondary voltages of a difference than the no-load voltage and load voltage ratio.
 
5, no-load current
When the transformer secondary open primary is still a certain current, this part of the current is called the no-load current. No-load current from magnetizing current (flux generated) and iron loss currents (caused by the core loss) component. For 50Hz power transformer, the load current is substantially equal to magnetizing current.
 
6, load loss
It refers to the transformer secondary open circuit, measured in the primary power loss. The main loss is core loss, followed by loss (copper loss) in the no-load current generated by the primary coil copper resistance, this part of the loss is small.
 
7, efficiency
It refers to the percentage of the secondary power P2 and P1 primary power ratio. Typically larger transformer rated power, the higher the efficiency.
 
8, the insulation resistance
Between the coils of a transformer, insulation between the coils and the core. Insulation resistance and the level of performance, low temperature and moisture level of insulation used in the material.