Grid Frequency Measurements of the Japanese (Tokyo area) Power System during 2017

Grid frequency measured for 42 days during 2017 in Japan, with sampling rate of 3 samples per second.<br>Data provided includes one column with the UNIX timestamp in milliseconds and one column with the frequency measurement in Hz.2017年在日本测量的电网频率数据，时长42天，采样率为每秒3次。 提供的数据包含一列毫秒级UNIX时间戳（UNIX timestamp）和一列以赫兹（Hz）为单位的频率测量值。