How to choose AC current transformer?

AC current transformer is a kind of thing commonly used by electricians, and it is also something commonly used by scientific researchers. In addition, this kind of equipment is also used in some factories, especially those that need to erect many lines. Because there are so many types of this product, how to choose after all, the following is an introduction to this problem. Such a question should be explained before the introduction. That is, even products of the same type and specification may have many differences. For example, the second winding of the coil may be different, or the maintenance coil may be different. Therefore, before choosing, you should carefully figure out the detailed parameters of the product you are about to purchase, so as not to buy products that do not meet your needs. Generally speaking, several parameters need to be referred to when selecting. The first parameter is the rated current, the second parameter is the secondary output current, and the third parameter is the current mutual inductance ratio. After referring to these parameters in detail, you should also carefully look at the nameplate on the product, especially the accuracy error of the measurement. If the error is not within your allowable range, do not buy it.