Current transformer is an important electrical measurement equipment, which is widely used in current measurement, monitoring and protection of power system. On the current transformer in the "05 level", "05s level" and "02 level", these are about the description of the transformer accuracy level. The accuracy class determines the accuracy of the current transformer measurement.

1. Level 05:

* "Level 05" means that the accuracy level of the current transformer is level 0.5, that is, the error of the current value measured by the transformer does not exceed ± 0.5%.

* This level of current transformer is usually used in situations where high-precision measurement is required, such as laboratory or high-precision industrial equipment. Because of its high accuracy, it can more accurately reflect the actual current situation and ensure the safe and stable operation of the power system.

Class 2. 05s:

* "s" in "05s level" represents the stability error. This means that the stability error of the current transformer does not exceed ± 0.5%. In practical applications, this means that the measured value can remain stable under long-term working conditions, with high reliability and accuracy. This kind of transformer is usually used in the situation of continuous change of load.

3. Level 02:

* "Class 02" means that the accuracy class of the current transformer is ± 0.2. This is a relatively high level of accuracy with small errors. In practical applications, this means that the measured value is more accurate, which is usually used in situations where the measurement accuracy is very high. Due to its high precision performance, the price of current transformers in this class is relatively high. It is widely used in the protection of key power systems or key equipment.

To sum up, "05 level", "05s level" and "02 level" are all indicators to describe the accuracy of current transformers, and there are differences in accuracy, application and price of different levels of current transformers. When choosing a current transformer, it needs to be considered according to the actual measurement needs, application scenarios and budget. At the same time, in addition to the accuracy level, other parameters such as rated current, rated voltage, load, etc. need to be considered to ensure that the selected current transformer can meet actual needs.