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A method for the indication of power transformer saturation

机译：一种指示电力变压器饱和的方法

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DC currents flowing from the earth cause many Hydro-Quebec transformers to saturate due to geomagnetically induced currents (GICs) or monopolar operation of HVDC systems with ground return. The resulting voltage distortion may affect the operation of control systems. This paper offers an explanation of the internal behavior of currents generated in the presence of DC currents. It also contains a harmonic analysis of these currents together with a detailed study of the magnetizing current. In saturation, a transformer core acts as a source of current generating harmonics, some of which will flow directly toward the primary and secondary windings. On the basis of these observations, the paper proposes a measurement method for obtaining the parameters needed to calculate a reliable indicator of the state of saturation of transformers. The method is based on the difference between the primary and secondary currents and on amplitude readings of the second and fourth harmonics.
机译：由于地磁感应电流（GIC）或具有接地回路的HVDC系统的单极运行，从地球流出的DC电流导致许多魁北克水电变压器饱和。产生的电压失真可能会影响控制系统的运行。本文对存在直流电流时产生的电流的内部行为进行了解释。它还包含对这些电流的谐波分析以及对励磁电流的详细研究。在饱和状态下，变压器铁心充当产生谐波的电流源，其中一些谐波将直接流向初级和次级绕组。基于这些观察，本文提出了一种测量方法，用于获得计算变压器饱和状态的可靠指标所需的参数。该方法基于一次电流和二次电流之间的差异以及二次谐波和第四次谐波的幅度读数。

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