Power transformer characteristic parameters

2019-04-24 14:29:06 JuKe Technology (DongGuan) Co., Ltd. Read

Power Transformers

The power transformer is a soft magnetic electromagnetic component whose functions are power transmission, voltage conversion and insulation isolation. It is widely used in power supply technology and power electronics technology.
According to the size of the transmission power, the power transformer can be divided into several files: 10kVA or more for high power, 10kVA to 0.5kVA for medium power, 0.5kVA to 25VA for low power, and 25VA for micropower. The transmission power is different, and the design of the power transformer is different. It should be self-evident.

Power Transformer  is used in almost all electronic products. It has a simple principle but different winding requirements depending on the application (different applications). The functions of the transformer mainly include: voltage conversion; impedance transformation; isolation; voltage regulation (magnetic saturation transformer), etc., and the core shape commonly used in transformers generally has E-type and C-type iron cores.

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Power transformer characteristic parameters

1, 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.
2, rated power
At a specified frequency and voltage, the transformer can operate for long periods of time without exceeding the output power of the specified temperature rise.
3, 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.
4, 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.
5, 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.
6, no-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.
7, efficiency
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.
8, 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.