220 kV复合外套金属氧化物避雷器在电缆终端台区运行的应用研究

Application of 220 kV Polymer-Housed Metal-Oxide Surge Arrester In Cable Terminal Platform Area

金属氧化物避雷器在运行时氧化锌电阻片沿轴线分布的电压不均匀分布影响避雷器的运行寿命,而电缆台区的避雷器在安装时外部电场条件是有别于变电站避雷器,通过ANSYS-Maxwell软件仿真计算了电缆终端对同相的避雷器电压分布的影响,增大避雷器与电缆终端的安装距离有利于改善避雷器的电压分布的不均匀性;又计算了按GB 50149规定的B1值布置的安装条件下220 kV避雷器的电压分布不均匀系数小于1.15,能满足避雷器使用要求。计算了避雷器与电缆终端之间连接导线的电感对避雷器保护水平的影响,结果表明:雷电冲击的导线电感电压影响较小,陡波冲击的导线电感电压影响显著。

When the Surge arresteris in operation,the voltage unbalance effects along the axis of the zinc oxide resistors is directly affected to the operation life spam of the arrester,and the external electric field conditions of the Surge arresterin the cable platform area are different from those in the substation during installation.The influence of the cable terminal on the electric field of the arrester in the same phase is calculated through the simulation of ANSYS-Maxwell software.Increasing the installation size of the ar⁃rester and the cable head is beneficial to the uniform electric field distribution of the arrester;also investi⁃gated the electric field distribution unevenness coefficient of the 220 kV arrester under the installation condition of the B1 value specified in GB50149,which is less than 1.15,and meet the design require⁃ments of arrester chargeability.In addition,the influence of the inductance of the connecting wire be⁃tween the arrester and the cable head on the protection level of the arrester is calculated.The impact of lightning impact is small,and the inductance voltage of the wire is significant during the steep wave im⁃pact.