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CEMIG experience in the analysis of transient recovery voltages associated with Transformer-fed faults

机译：CEMIG在分析与变压器故障相关的瞬态恢复电压方面的经验

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This paper presents the transient studies carried out by CEMIG (Companhia Energetica de Minas Gerais - Brazil) to determine the transient recovery voltage (TRV) parameters of 230kV circuit-breakers regarding the clearing of transformer-fed faults. As the frequency transformer response is the dominant feature in the determination of these parameters, it is clear that the transformer modeling is a very important factor in this type of analysis. So, the main focus of the study was to represent the transformers associated with the circuit-breakers under analysis as accurate as possible. TRT results considering different transformer models will be presented, compared and discussed, emphasizing the parameters more sensitive to the transformer model. It is shown that the transformer response is of multi-frequency form and can affect the results in different ways.rnThe circuit-breakers in analysis will be part of a new link that interconnects a very long and weak 138kV sub transmission system to CEMIG main extra - high voltage grid. The necessary steps to upgrade the usual CEMIG circuit-breaker specification will be shown to ensure a reliable operation as far as the TRT parameters are concerned.rnIn the conclusion, it is pointed out the importance of a good agreement between user and transformer/circuit-breaker manufacturer in order to achieve reliable results, especially in cases associated with severe conditions in comparison with IEC circuit-breaker standard. It is also shown that the analysis performed was a good opportunity to enhance CEMIG state-of-the art knowledge in this field to be applied in future studies
机译：本文介绍了由CEMIG（巴西米纳斯吉拉斯州的Energetica de Minas Gerais公司）进行的瞬态研究，以确定与清除变压器馈电故障有关的230kV断路器的瞬态恢复电压（TRV）参数。由于变频器响应是确定这些参数的主要特征，因此很显然，变压器建模是此类分析中非常重要的因素。因此，研究的主要重点是尽可能准确地表示与分析中的断路器相关的变压器。将介绍，比较和讨论考虑不同变压器模型的TRT结果，强调对变压器模型更敏感的参数。结果表明，变压器的响应是多频形式的，并且可能以不同的方式影响结果。分析中的断路器将成为一条新的链接的一部分，该新链接将一个非常长而弱的138kV子输电系统与CEMIG主回路互连。 -高压电网。将展示升级常规CEMIG断路器规范的必要步骤，以确保就TRT参数而言可靠的操作。总结中，指出了用户与变压器/电路之间达成良好协议的重要性。断路器制造商，以便获得可靠的结果，尤其是与IEC断路器标准相比在恶劣条件下的情况。还表明进行的分析是增强该领域CEMIG最新技术知识的好机会，可用于将来的研究

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