What are the thermal characteristics of the 3GI3 (EPR) insulation compound used in high-voltage VDE cables?
In the strict hierarchy of VDE standards, 3GI3 represents a specific high-performance grade of Ethylene Propylene Rubber (EPR) insulation. Defined under DIN VDE 0207 Part 20, this compound is engineered specifically for Medium Voltage (MV) and High Voltage (HV) applications. Unlike standard rubber (like 3GI1) or thermoplastics (like PVC), 3GI3 is a cross-linked elastomer designed to withstand high continuous operating temperatures (90°C), extreme short-circuit heat (250°C), and the damaging effects of ozone in high-field environments.
在严格的 VDE 标准体系中，3GI3 代表一种特定高性能等级的乙丙橡胶 (EPR) 绝缘材料。根据 DIN VDE 0207 第 20 部分 定义，该化合物专为中压 (MV) 和高压 (HV) 应用而设计。与标准橡胶（如 3GI1）或热塑性塑料（如 PVC）不同，3GI3 是一种交联弹性体，旨在承受高连续工作温度 (90°C)、极端短路热 (250°C) 以及高场环境中臭氧的破坏作用。
