摘要
针对浪涌保护器接地线过长问题,以风电机组变流器网侧SPD为例,首先根据GB 50057—2010标准结合风电机组实际情况,分析网侧SPD选型,然后利用雷电冲击试验平台,对SPD接地线对残压的影响进行研究。结果表明:变流器网侧可选择II级SPD。随着冲击电流的增大,SPD残压会增大。随着接地线长度增加,残压增大。当线长达到1 m时,残压理论计算值5.1kV,高于实际冲击残压4.78kV。变流器工作状态下冲击,会导致SPD残压抬高。
In view of the problem of excessively long grounding wire in SPD,take the SPD of windturbine converters as an example,first of all,according to GB 50057-2010 standard in combination withthe practical situation of wind turbines,the network SPD selection is analyzed,and then lightning shocktest platform is adopted to analyze the influence of SPD grounding wire on the residual voltage. The re-sults show that the type II SPD can be selected on the network of the converter. With the increase of im-pact current,SPD residual voltage will increase. The residual voltage increases as the length of groundwire increases. When the line length reaches 1 m,the theoretical calculation value of residual voltage is5.1kV,which is higher than the actual impact residual voltage 4.78kV. Under the working condition ofthe converter,the residual voltage of SPDs will be pushed up.
引文
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