{
  "id": 5121,
  "title": "harmonic features vs. FFT",
  "url": "/competitions/belkin-energy-disaggregation-competition/discussion/5121",
  "author_name": "",
  "post_date": "2013-07-16T21:14:33.283Z",
  "votes": null,
  "comment_count": 1,
  "views": 1886,
  "content": "<p>The harmonic features for Phase 1 and 2 are listed as the fundamental and 5 harmonics for the I and V measurements for the two phases of the circuit. Am I to take that to mean it's a measurement of the signal at 60, 120, 180, 240, 300, 360 Hz?</p>\r\n<p>I read elsewhere that the sampling rate for the FFT was 2 MHz. That gives bin spacing of ~244Hz. That basically means the harmonic features are only affecting the 1st 2 (or so) bins of the FFT?&nbsp;</p>",
  "messages": [
    {
      "id": "27298",
      "postDate": "07/16/2013 21:14:33",
      "content": "<p>The harmonic features for Phase 1 and 2 are listed as the fundamental and 5 harmonics for the I and V measurements for the two phases of the circuit. Am I to take that to mean it's a measurement of the signal at 60, 120, 180, 240, 300, 360 Hz?</p>\r\n<p>I read elsewhere that the sampling rate for the FFT was 2 MHz. That gives bin spacing of ~244Hz. That basically means the harmonic features are only affecting the 1st 2 (or so) bins of the FFT?&nbsp;</p>",
      "rawMarkdown": "",
      "votes": null
    },
    {
      "id": "27308",
      "postDate": "07/17/2013 00:43:26",
      "content": "<p>Yes for the current measurements, the 6 values are the fundamental and first 5 harmonics of the current measurement.</p>\r\n<p>The FFT and 2 Mhz that you are referring to are measured in Voltage domain and have nothing (in this context) to do with the 60Hz current harmonics. This is explained in the competition description, as evident by the figure and also the paper referenced\r\n as [3]. I highly recommend&nbsp;going over that literature to develop an intuition of what these various feature are.</p>\r\n<p>Sidhant</p>",
      "rawMarkdown": "",
      "votes": null
    }
  ],
  "comments": [
    {
      "id": 27308,
      "author_name": "sidhantgupta",
      "author_url": "",
      "post_date": "07/17/2013 00:43:26",
      "content": "<p>Yes for the current measurements, the 6 values are the fundamental and first 5 harmonics of the current measurement.</p>\r\n<p>The FFT and 2 Mhz that you are referring to are measured in Voltage domain and have nothing (in this context) to do with the 60Hz current harmonics. This is explained in the competition description, as evident by the figure and also the paper referenced\r\n as [3]. I highly recommend&nbsp;going over that literature to develop an intuition of what these various feature are.</p>\r\n<p>Sidhant</p>",
      "votes": null,
      "replies": []
    }
  ],
  "raw_markdown_by_id": {
    "27298": "",
    "27308": ""
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  "source": "meta"
}