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Transformer Introduction
Classified according to the cooling method: dry-type (self-cooling) transformers
Release time:
2022-08-22 10:23
Classified according to the cooling method: dry-type (self-cooling) transformers, oil-immersed (self-cooling) transformers, fluoride (evaporative cooling) transformers.
Classified according to the moistureproof way: open transformer, potting transformer, sealed transformer.
Classified by core or coil structure: core transformer (insert core, C-type core, ferrite core), shell transformer (insert core, C-type core, ferrite core), toroidal transformer, metal foil transformer.
Classified by the number of power supply phases: single-phase transformer, three-phase transformer, multi-phase transformer.
Classified by use: power transformer, voltage regulator transformer, audio transformer, medium frequency transformer, high frequency transformer, pulse transformer.
Working frequency
Transformer core loss is very much related to the frequency, so it should be designed and used according to the frequency of use, this frequency is called the operating frequency.
Rated power
In the specified frequency and voltage, the transformer can work for a long time, without exceeding the specified temperature rise of the output power.
Rated voltage
Refers to the voltage allowed to be applied on the coil of the transformer, which shall not be greater than the specified value when working.
Voltage ratio
Refers to the ratio of primary voltage and secondary voltage of the transformer, there is a difference between no-load voltage ratio and load voltage ratio.
No-load current
Transformer secondary open circuit, the primary still have a certain current, this part of the current is called no-load current. The no-load current consists of magnetizing current (which generates magnetic flux) and iron loss current (caused by iron core loss). For 50Hz power transformers, the no-load current is basically equal to the magnetizing current.
No-load losses
Refers to the transformer secondary open circuit, in the primary power loss measured. The main loss is the core loss, followed by the loss generated by the no-load current on the copper resistance of the primary coil (copper loss), which is very small.
Efficiency
Refers to the secondary power P2 and primary power P1 ratio of the percentage. Usually the same volume, the greater the rated power of the transformer, the higher the efficiency.
Insulation resistance
Indicates the insulation between the coils of a transformer and between the coils and the core. The level of insulation resistance is related to the performance of the insulating materials used, temperature and humidity.
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