Transformer Fault Analysis Using Event Oscillography

C. Labuschagne, N. Fischer
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引用次数: 3

Abstract

Transformer differential protection operates on Kirchhoff's well-known law that states, "the sum of currents entering and leaving a point is zero". Although Kirchhoff's law is well understood, the implementation of the law in transformer differential protection involves many practical considerations such as current transformer (CT) polarity, phase-angle correction, zero-sequence removal, and CT grounding. Still, even correctly implemented transformer differential protection misoperates occasionally, resulting from conditions such as CT saturation during heavy through faults. Whereas electromechanical and electronic relays provide no or very little fault information, numerical relays provide an abundance of information. However, the analyst must still select the correct fault information from this abundance of information to perform useful fault analysis. This paper demonstrates how to begin analysis of such events by using real-life oscillographic data and going through a step-by-step analysis of the relay algorithm using a mathematical relay model. Relay engineers can use this paper as a reference for analyzing transformer oscillography in a systematic and logical manner
用事件示波器分析变压器故障
变压器差动保护的工作原理是基尔霍夫著名的定律,即“进入和离开一个点的电流总和为零”。虽然基尔霍夫定律很好理解,但在变压器差动保护中实施该定律涉及许多实际考虑因素,如电流互感器(CT)极性、相角校正、零序去除和CT接地。尽管如此,即使正确实施变压器差动保护,偶尔也会出现误操作,这是由于在严重故障期间CT饱和等情况造成的。机电继电器和电子继电器不提供或提供很少的故障信息,而数字继电器提供了丰富的信息。然而,分析人员仍然必须从这些丰富的信息中选择正确的故障信息来执行有用的故障分析。本文演示了如何通过使用现实生活中的示波器数据开始分析此类事件,并使用数学继电器模型逐步分析继电器算法。本文可为继电器工程师系统、合理地分析变压器示波器提供参考
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