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首页> 外文会议>2014 IEEE PES Tamp;D Conference and Exposition >Field studies on the Inrush Current for 33/11kV transformer and the effect on voltage interruption during switching operation of 10MW wind farm
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Field studies on the Inrush Current for 33/11kV transformer and the effect on voltage interruption during switching operation of 10MW wind farm

机译：33MW / 11kV变压器励磁涌流的现场研究及对10MW风电场投切运行中电压中断的影响

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摘要

The Inrush Current for transformer switching operation study is an electromagnetic transient analysis (EMT) and are performed in order to investigate the network response after the energized the two 33/11 kV, 7.75MVA transformers in the Layafa S/S. The Inrush current associated with transformer energizing can cause some reactions that may adversely affect other loads in the power networks system, for instance voltage sags or over-voltage phenomena which could cause nuisance tripping for protective devices or loads. Protection devices may mis-interpret these events as fault currents, if the protection devices are not properly coordinated well. In this paper, the inrush current analysis was performed for the generators-transformers of the wind farm switching operation. In the study analysis, the 33/11 kV transformers will not be energized at the same time. Each transformer will be energized at no load condition, with the tap changer set to the maximum step of the HV side (higher voltage) in order to minimize the inrush current values. The simulation analysis was performed which the aid of DigSilent and EMT computer simulation to establish this study while considering the minimum short circuit power in the grid and the Wind Farm disconnection from the system. This paper is based on the field results test of the newly installed wind farm generator-transformer in relation to network interruption on the 33 kV and 11 kV systems during the switching on operation especially transient voltage phenomena.
机译：用于变压器开关运行研究的浪涌电流是一种电磁瞬态分析（EMT），旨在调查Layafa S / S中的两个33/11 kV，7.75MVA变压器通电后的网络响应。与变压器通电相关的浪涌电流会引起一些反应，这些反应可能会对电网系统中的其他负载产生不利影响，例如电压骤降或过电压现象，可能会导致保护设备或负载的误跳闸。如果保护设备未正确协调，则保护设备可能会将这些事件误认为是故障电流。在本文中，对风电场切换操作的发电机-变压器进行了浪涌电流分析。在研究分析中，不会同时给33/11 kV变压器通电。每个变压器将在无负载条件下通电，将分接开关设置为HV侧的最大步进（较高的电压），以最小化浪涌电流值。进行了仿真分析，借助DigSilent和EMT计算机仿真建立了这项研究，同时考虑了电网中的最小短路功率以及风电场与系统的断开连接。本文基于新安装的风电场发电机-变压器与33 kV和11 kV系统在接通操作期间的网络中断（尤其是瞬态电压现象）相关的现场结果测试。

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