苏通GIL综合管廊声传播特性仿真研究

苏州-南通气体绝缘金属封闭式输电线路(Gas-Insulated metal-enclosed transmission Line,GIL)综合管廊工程是目前世界上电压等级最高、输送容量最大、技术水平最高的超长距离GIL创新工程。通过分析管廊内部结构,建立了其物理模型,根据声学理论,结合管廊布置方式提出两种计算模型,采用有限元方法对苏通GIL综合管廊的声场分布进行计算,并能为管廊内的故障声波定位提供参考。研究结果表明:对于非均匀声源,管廊的平面波截止频率在15 Hz附近。若声源频率低于15 Hz,声波在传播过程中快速转化为一维平面波,可采用"到达时间差法"(Time Difference of Arrival,TDOA)进行定位;如果声源频率高于15 Hz,则需对声波信号做进一步的时域和频域分析以确定适合的定位算法。

Simulation study of acoustic propagation characteristics in Suzhou-Nantong GIL multi-utility tunnel

The Suzhou-Nantong GIL multi-utility tunnel is an innovative engineering project using super long distance GIL with so far the highest voltage level, the largest transmission capacity and the highest technological level in the world. By analyzing the internal structure of the multi-utility tunnel, the physical model of the multi-utility tunnel is built, and two calculating models are put forward based on the acoustic theory and the layout mode of the multi-utility tunnel. The finite element method is applied to calculating the sound field distribution of the multi-utility tunnel, and it can provide a reference for locating the fault position in the tunnel. The results show that for nonuniform sound source, the cut-off frequency of the plane wave in the multi-utility tunnel is around 15 Hz. If the frequency of sound source is below 15 Hz, the sound wave can be rapidly transformed into plane wave during its propagation. Therefore, the fault position can be simply located by TODA (Time Difference of Arrival) method. If the frequency of sound source is higher than 15 Hz, the sound signal should be further analyzed in time domain and frequency domain to determine the appropriate location algorithm.