|Analysis for lightning protection in building electrical systems by using FDTD methods
|Chen, Mingli (BSE)
Building -- Protection
Hong Kong Polytechnic University -- Dissertations
|Department of Building Services Engineering
|73 pages : color illustrations
|Lightning is an electromagnetic phenomenon that occurs frequently in nature. Its huge energy can cause damage to life, and various types of safety accidents such as interruption of power supply and damage to equipment in buildings. This dissertation is mainly illustrating the effects of different lightning protection measures in building when suffered a lightning strike by using FDTD method. To establish a reliable numerical analysis model, the building model and the electrical system model are built in the XFDTD software and a 20kA lightning current with Heidler waveform is simulated. The building is an isolated brick structure. The power supply system uses TN-C system. To analyze different lightning protection systems, 4 kinds of different situations are simulated. First is the building without any protection. We got the result that in the same circuit, the farther away from the lightning current and the closer to the grounding body, the smaller the induced current. However, for electrical appliances, the induced current still can cause damage. Then the lightning rod and the grounding conduct is installed. Moreover, surge protection device (SPD) is introduced into the system. By analyzing SPDs on the source side or the loads side, we find that the peak current in the loads are differently dropped. In general, we concluded that SPD is an effective protection measure for building electrical system. However, when SPD is only installed on the source side, not all the loads can be protected. Therefore, all the high-risk loads should be equipped with SPD.
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