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　　Working frequency

　　Transformer core loss has a large relationship with frequency, so it should be designed and used according to the frequency of use. This frequency is called the working frequency.

　　Rated power

　　At a specified frequency and voltage, the transformer can operate for a long period of time without exceeding the output power of the specified temperature rise.

　　Rated voltage

　　Refers to the voltage that is allowed to be applied to the coil of the transformer and must not be greater than the specified value during operation.

　　Voltage ratio

　　Refers to the ratio of the primary voltage to the secondary voltage of the transformer, which has the difference between the no-load voltage ratio and the load-to-voltage ratio.

　　No-load current

　　When the secondary of the transformer is open, there is still a certain current in the primary. This part of the current is called no-load current. The no-load current consists of magnetizing current (generating magnetic flux) and iron loss current (caused by core loss). For a 50 Hz power transformer, the no-load current is substantially equal to the magnetizing current.

　　Load loss

　　Refers to the power loss measured at the primary when the transformer is open secondary. The main loss is the core loss, followed by the loss (copper loss) of the no-load current on the primary coil copper resistance, which is small.

　　Effectiveness

　　Refers to the percentage of the ratio of the secondary power P2 to the primary power P1. Generally, the higher the rated power of the transformer, the higher the efficiency.

　　Insulation resistance

　　It indicates the insulation performance between the coils of the transformer and between the coils and the iron core. The insulation resistance is related to the performance of the insulating material used, the temperature and the degree of humidity.