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首页> 外文会议>2016 IEEE International Conference on High Voltage Engineering and Application >The study of very fast transient over voltages (VFTO) for the project of 400/220kV GIS substation with one and half circuit breaker configuration
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The study of very fast transient over voltages (VFTO) for the project of 400/220kV GIS substation with one and half circuit breaker configuration

机译：具有一半和一半断路器配置的400 / 220kV GIS变电站项目的超快速瞬态过电压（VFTO）的研究

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摘要

Gas insulated switchgears (GIS) are playing an important role in today's power systems. These are being used in many transmission and distribution substations because of their compactness and durability. The basic insulation coordination levels are well defined in the international standards. The ratio of lightning impulse withstand voltage level to per unit voltage varies for different system voltages. This ratio decreases when we go for extra high voltages. Therefore the insulation for extra high voltages should be carefully designed to avoid the dielectric failures. Very fast transient over voltages (VFTO) which are caused by the switching operations are the important factors to be considered in the design of GIS. The disconnector (DS) operation is slow when compared to the circuit breaker operation. Therefore, DS switching is the main source for generating VFTO in GIS. The transients are characterized by their short duration and very high frequencies. VFTO study has been carried out for the project 400/220kV GIS Substation in accordance with the methodology and guidelines as per CIGRE WG D1.03 - TB 519 [1] recommendations, IEEE standard 1313.2-1999 [2], IEC 60071-2 [3], IEC 60071-4 [4], and IEEE technical papers presented in various forums. Accordingly the study has been carried out to assess overvoltages at various surge impedance transition points. The results of this study are represented in this paper.
机译：气体绝缘开关设备（GIS）在当今的电力系统中起着重要的作用。由于它们的紧凑性和耐用性，它们被用于许多输配电变电站。基本绝缘协调级别在国际标准中已明确定义。雷电冲击耐受电压水平与每单位电压的比率随系统电压的不同而变化。当我们追求更高的电压时，该比率会降低。因此，应对超高压绝缘进行精心设计，以避免介电故障。由开关操作引起的非常快速的瞬态过电压（VFTO）是GIS设计中要考虑的重要因素。与断路器操作相比，隔离开关（DS）的运行速度较慢。因此，DS切换是在GIS中生成VFTO的主要来源。瞬变的特点是持续时间短且频率很高。根据CIGRE WG D1.03-TB 519 [1]建议，IEEE标准1313.2-1999 [2]，IEC 60071-2 [CI]的方法和指南，已对400 / 220kV GIS变电站项目进行了VFTO研究。 3]，IEC 60071-4 [4]和在各种论坛上发表的IEEE技术论文。因此，已经进行了研究以评估在各种浪涌阻抗转变点处的过电压。这项研究的结果在本文中进行了介绍。

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