220kV电缆末端避雷器能量吸收特性研究

Study on The Energy Absorption Properties of Surge Arrester at 220 kV Cable End

以220千伏电缆为研究对象,在末端单相接地的情况下,应用PSCAD/EMTDC软件,对一些参数,如:接地电阻,引线电感,源阻抗比,和避雷器的额定电压等对避雷器吸收能量特性的影响进行了研究,并对避雷器的能量吸收能力的选择进行了讨论。研究结果表明:避雷器吸收的能量受接地电阻和避雷器额定电压的影响较为显著,源阻抗比影响较小,引线电感基本无影响。同时,计算结果还表明,额定电压越低,避雷器承受的能量更多,对其能量吸收能力的要求越高。

For the 220 kV cable, under the situation of the end single-phase grounding, the influence of some parameters, such as grounding resistance, lead inductance, source impedance ratio, and the arrester rated voltage, on the arrester energy absorption characteristics are studied by the PSCAD/EMTDC software, the selection for energy absorption capacity of surge arresters are discussed. The lower rated voltage is, the more energy the arrester withstand, and the higher the requirements of its energy absorption capacity.