阀型避雷器主要是碳化硅，和间隙组成，目前国内停产
The valve type arrester is mainly composed of silicon carbide and gap.
管型避雷器保护效果不好，市场上早没有了
The protective effect of tubular lightning arrester is not good.
金属氧化物避雷器目前是系统主流产品。主要是氧化锌，保护效果比阀型避雷器好的多
Metal oxide surge arresters are currently the mainstream products of the system. Mainly Zinc Oxide, the protection effect is better than the valve type arrester.