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In the field of power system protection and control, more CPU work has is a common way of application, in order to guarantee the reliability of the intelligent sunstation relay protection and control device to run, the need for more internal communication between the CPU data management, exception handling etc. To fully verify, to ensure the power system to the maloperation of the protection device under various conditions will not; Due to the complex operation environment of relay protection device, all the internal communication data processing. Uses in each CPU application design a special detecting module, can under the conditions of without changing the origial wiring layout,to control the application of data between the CPU and various operating condition is verified the correctness of the internal communication between multiple CPU boards, the intelligents sunstation relay protection and control device of all kinds of normal data and abnormal data processing ability adequately testing and verfication ensure the reliability of the protection and control device.