Study on Impulse Characteristics of Wind Turbine Grounding Network Based on Field circuit Method
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摘要: 在雷击过程中, 雷电流沿风电机组塔筒注入接地网, 会引起接地网的地电位升高。为更好地研究雷击产生的暂态过电压对风电机组及其输变电设备产生的影响, 采用场路结合的思想建立接地网暂态电路模型, 对雷击引起的地电位升高进行系统仿真计算。计算结果表明:由于雷电流波头频率很高, 与电阻相比接地体本身的电感效应非常明显, 将引起接地网的地电位大幅度升高;暂态过电压将对地下传输、通信和控制电缆最外层绝缘造成破坏, 严重时甚至会造成局部放电。Abstract: When lightning happens, lightning current enters grounding systems through the tower, which will cause ground potential rises. In order to study the effect of transient over voltage and its effect on wind turbines and other power equipments more effectively, a grounding transient circuit model is built based on the idea of field circuit method, and the rise of ground potential caused by lightning is simulated in this paper. The calculation result shows that inductance effect of grounding is more obvious than that of resistor due to high frequency of lightning current, which increases the grounding potential of grounding network. In addition, transient over voltage will destroy the insulating layer of the transmission, communication, and control cable, and over voltage will also cause partial discharge.
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Keywords:
- lightning /
- wind power /
- over voltage /
- grounding /
- insulating layer
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