What are the components of traditional relay protection devices?

There are many types of relay protection, but generally they consist of three parts: 1. Measuring part: measuring the physical quantity of the working state of the protected component and comparing it with the known setting value to determine whether the protection should be activated; 2.

Logic part: According to the size, nature, order of appearance or their combination of the output quantities of the measuring part, the protection device works according to a certain logic program, and finally transmitted to the execution part. 3. Execution part: According to the signal sent by the logic part, finally

Complete the tasks undertaken by the protection device, such as sending a signal, tripping or inaction, etc.