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In electrical engineering, dot marking convention, or alphanumeric marking convention, or both, can be used to denote the same relative instantaneous polarity of two mutually inductive components such as between transformer windings. These markings may be found on transformer cases beside terminals, winding leads, nameplates, schematic and wiring diagrams. The convention is that current entering a transformer at the end of a winding marked with a dot, will tend to produce current exiting other windings at their dotted ends.

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  • Convención del punto (es)
  • Polarity (mutual inductance) (en)
  • 點規定 (zh)
rdfs:comment
  • En el análisis de circuitos, la convención del punto es una convención usada para denotar la polaridad del voltaje de dos componentes mutuamente inductivos, tal como el devanado en un transformador. La polaridad de todos los terminales punteados será la misma en cualquier momento determinado, suponiendo un transformador ideal sin ​ (es)
  • 在電路分析裏,點規定(dot convention)專門設定兩個耦合線圈的互感電壓的正負極性。點規定假設互感 永遠是正值。在使用點規定前,必須先在每一個線圈的某一端標註圓點,稱為「圓點端」,另一端則不標註任何符號。點規定表明: 假若電流進入一個線圈的圓點端,則另一個線圈的圓點端的參考極性是正極;假若電流離開一個線圈的圓點端,則另一個線圈的圓點端的參考極性是負極。 (zh)
  • In electrical engineering, dot marking convention, or alphanumeric marking convention, or both, can be used to denote the same relative instantaneous polarity of two mutually inductive components such as between transformer windings. These markings may be found on transformer cases beside terminals, winding leads, nameplates, schematic and wiring diagrams. The convention is that current entering a transformer at the end of a winding marked with a dot, will tend to produce current exiting other windings at their dotted ends. (en)
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  • http://commons.wikimedia.org/wiki/Special:FilePath/Instrument_Transformer_LV_terminals.jpg
  • http://commons.wikimedia.org/wiki/Special:FilePath/Instrument_Transformer_HV_terminals.jpg
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  • y (en)
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  • July 2022 (en)
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  • En el análisis de circuitos, la convención del punto es una convención usada para denotar la polaridad del voltaje de dos componentes mutuamente inductivos, tal como el devanado en un transformador. La polaridad de todos los terminales punteados será la misma en cualquier momento determinado, suponiendo un transformador ideal sin ​ (es)
  • In electrical engineering, dot marking convention, or alphanumeric marking convention, or both, can be used to denote the same relative instantaneous polarity of two mutually inductive components such as between transformer windings. These markings may be found on transformer cases beside terminals, winding leads, nameplates, schematic and wiring diagrams. The convention is that current entering a transformer at the end of a winding marked with a dot, will tend to produce current exiting other windings at their dotted ends. Maintaining proper polarity is important in power system protection, measurement and control systems. A reversed instrument transformer winding may defeat protective relays, give inaccurate power and energy measurements, or result in display of negative power factor. Reversed connections of paralleled transformer windings will cause circulating currents or an effective short circuit. In signal circuits, reversed connections of transformer windings can result in incorrect operation of amplifiers and speaker systems, or cancellation of signals that are meant to add. (en)
  • 在電路分析裏,點規定(dot convention)專門設定兩個耦合線圈的互感電壓的正負極性。點規定假設互感 永遠是正值。在使用點規定前,必須先在每一個線圈的某一端標註圓點,稱為「圓點端」,另一端則不標註任何符號。點規定表明: 假若電流進入一個線圈的圓點端,則另一個線圈的圓點端的參考極性是正極;假若電流離開一個線圈的圓點端,則另一個線圈的圓點端的參考極性是負極。 (zh)
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