Current recording method, current recording device and current recording system

A current recording device, comprising:

• an acquisition unit, configured to acquire a first current Fourier value and a second current Fourier value, the first current Fourier value being a Fourier value acquired by Fourier transforming an instantaneous value of current at a first end of a power line, the second current Fourier value being a Fourier value acquired by Fourier transforming an instantaneous value of current at a second end of the power line;
• an alignment unit, configured to time-align the first current Fourier value and the second current Fourier value based on a first transmission delay for acquiring the first current Fourier value and a second transmission delay for acquiring the second current Fourier value;
• and
• a storage unit, configured to store the aligned first current Fourier value and second current Fourier value.

A current recording system, comprising:

• a first current recording device, a second current recording device and a server,
• the first current recording device is configured to collect an instantaneous value of current at a first end of a power line, Fourier transform the collected instantaneous value into a first current Fourier value, and transmit the first current Fourier value to the server via a first communication channel between the first current recording device and the server;
• the second current recording device is configured to collect an instantaneous value of current at a second end of the power line, Fourier transform the collected instantaneous value into a second current Fourier value, and transmit the second current Fourier value to the server via a second communication channel between the second current recording device and the server;
• and
• the server is configured to time-align the first current Fourier value and the second current Fourier value based on a transmission delay for the first communication channel and a transmission delay for the second communication channel, and store the aligned first current Fourier value and second current Fourier value into a storage of the server.