当长线路高压单芯电缆运行时，由于电磁感应或设备故障，产生过电压，极易击穿电缆外护层套，形成单芯电缆多点接地故障，电缆护层保护器能有效限制电缆金属屏蔽层（金属护套）
When long-line high-voltage single-core cable is in operation, due to electromagnetic induction or equipment failure, overvoltage will occur, which will easily break through the outer sheath of the cable, resulting in multi-point grounding fault of the single-core cable. The cable sheath protector can effectively limit the metal shielding layer (metal sheath) of the cable.
感应电压和设备故障过电压，更好的保护电缆的正常运行。电缆护层保护器主要用于缆护层保护接地箱和电缆护层交叉互联接地箱。
Induction voltage and equipment fault overvoltage can better protect the normal operation of cable. Cable sheath protector is mainly used for cable sheath protection grounding box and cable sheath cross-connected grounding box.
电缆护层保护器的特点如下：
The characteristics of cable sheath protector are as follows:
1 优异的保护特性，有效限制电缆金属屏蔽层（金属护套）感应过电压和故障过电压。
1. Excellent protection characteristics, effectively limit the induction overvoltage and fault overvoltage of metal shield layer (metal sheath) of cable.
2 伏安特性曲线平坦，通流能力大，保护特性好。
2 Volt-ampere characteristic curve is flat, the current capacity is large, and the protection characteristic is good.
3 硅橡胶外套，采用独有的界面粘和技术和整体一次成型工艺，密封性能好，安全防暴，免维护。
Silicone rubber coat, with unique interface adhesion and technology and the whole one-time forming process, has good sealing performance, safety and anti-riot, maintenance-free.