Oil-immersed transformer overtemperature warning method under harmonic condition

Oil-immersed transformer overtemperature warning method under harmonic condition

  • CN 105,699,799 A
  • Filed: 11/28/2014
  • Published: 06/22/2016
  • Est. Priority Date: 11/28/2014
  • Status: Active Application
First Claim
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1. the oil-filled transformer excess temperature method for early warning under a harmonic condition, it is characterised in that:

  • said method comprising the steps of;

    (1) distribution of any harmonic current and the Transformer Winding eddy-current loss of same total current virtual value, stray loss of transformer and the famous value of transformator total load loss are determined;

    (2) relation of transformer load loss, percent harmonic distortion and load factor is determined;

    (3) relation of transformator temperature rise at the hottest point, percent harmonic distortion and load factor is determined;

    (4) threshold value of corresponding warning level is determined。

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