Local rapid isolation implementation method

The invention discloses a local rapid isolation implementation method, and the method comprises the steps that a first intelligent device enables an optical fiber to serve as a channel so as to transmit a current to a second intelligent device; the first intelligent device is connected with the second intelligent device through an optical fiber; the first intelligent device calculates the value of the current in the channel through employing a full-wave Fourier algorithm, enables the value of the current to serve as a side collection value and transmits the side collection value to the second intelligent device through employing an optical fiber; the second intelligent device receives the transmitted current, and enables the value of the collected current to serve as a local collection value; the second intelligent device receives the side collection value, calculates and obtains a differential current through employing the side collection value and the local collection value, and judges whether a protection