Lightning arrester monitoring device, method and system based on GPS time service ratio correction

The invention relates to a lightning arrester monitoring device, method and system based on GPS time service ratio correction. The method comprises the following steps: synchronously sampling a three-phase voltage PT of a lightning arrester and a leakage current CT of the lightning arrester by using a second pulse signal ofa GPS time service; correcting the three-phase voltage PT and the leakage current CT by adopting a ratio correction method to obtain a corrected three-phase voltage PT and a corrected leakage current CT; determining a power factor angle, a resistive component of the leakagecurrent and a capacitive component of the leakage current according to the corrected three-phase voltage PT and the corrected leakage current CT; and analyzing an operation condition of the lightningarrester in a power grid according to the power factor angle, the resistive component of the leakage current and the capacitive component of the leakage current. In the invention, the measurement is convenient, and measurement