Synchronization and protection integration device for hydro-generator based on alternating-current sampling

The utility model discloses a synchronization and protection integration device for a hydro-generator based on alternating-current sampling, and the device comprises a power circuit, an alternating-current sampling circuit, a main CPU, a CPU interface circuit, a communication circuit, a key circuit, a display circuit, and a phase angle difference judgment circuit. The power circuit, the alternating-current sampling circuit, the CPU interface circuit, the communication circuit, the key circuit and the display circuit are respectively connected to the main CPU. The device is small in size, is convenient to install, is accurate in data sampling, is short in time of protection operation and accurate in protection operation, is quicker and more stable in grid connection, has a strong in fault memorizing capability, can quickly achieve fault elimination, and is wider in application environment.