1. Working frequency
The core loss of a transformer is closely related to the frequency, so it should be designed and used based on the operating frequency, which is called the working frequency.
2. Rated power
The output power of a transformer that can operate for a long time without exceeding the specified temperature rise under the specified frequency and voltage.
3. Rated voltage
It refers to the voltage that is allowed to be applied to the coil of the transformer. During operation, it must not exceed the specified value.
4. Voltage ratio
It refers to the ratio of the primary voltage to the secondary voltage of a transformer, and there is a distinction between the no-load voltage ratio and the load voltage ratio.
5. No-load current
When the secondary of a transformer is open-circuited, there is still a certain current at the primary. This part of the current is called no-load current. No-load current consists of magnetization current (generating magnetic flux) and iron loss current (caused by core loss). For a 50Hz power transformer, the no-load current is basically equal to the magnetization current.
6. No-load loss
It refers to the power loss measured at the primary level when the secondary of the transformer is open-circuited. The main loss is the core loss, followed by the loss (copper loss) generated by the no-load current on the copper resistance of the primary coil. This part of the loss is very small.
7. Efficiency
It refers to the percentage of the ratio of the secondary power P2 to the primary power P1. Generally, the larger the rated power of a transformer is, the higher its efficiency will be.
8. Insulation resistance
It indicates the insulation performance between each coil of the transformer and between each coil and the core. The level of insulation resistance is related to the performance of the insulating material used, the temperature and the degree of humidity.