申海防爆
基于比较漏电起痕指数 (计算机技术研究所), 增安型电气设备所用固体绝缘材料可分为三级: 我, 二, 和IIa, 如表所示 1.9. 根据GB/T 4207-2012 “固体绝缘材料电漏电起痕指数的测定方法,” a grading of commonly used insulation materials is provided, as detailed in Table 1.10.
| Material level | Compared to Traceability Index (计算机技术研究所) |
|---|---|
| 我 | 600≤CTI |
| 二 | 400≤CTI＜600 |
| IIIa | 175≤＜400 |
Beyond this material classification, the insulation materials must also meet operational temperature requirements. If enhanced-safety electrical equipment operates under permissible abnormal conditions at its rated operational state, its maximum working 温度 should not adversely affect its mechanical and electrical properties. 所以, the stable temperature of the insulation material should be at least 20°C higher than the equipment’s maximum operating temperature, and not lower than 80°C.
| Material level | Insulation material |
|---|---|
| 我 | Glazed ceramics, 云母, 玻璃 |
| 二 | Melamine asbestos arc resistant plastic, silicone organic stone arc resistant plastic, unsaturated polyester group material |
| ⅢA | 聚四氟乙烯塑料, 三聚氰胺玻璃纤维塑料, epoxy glass cloth board with surface treated with arc resistant paint |
Designers can select the appropriate insulation materials based on the working voltage of the electrical equipment and other related requirements. If the aforementioned materials do not meet the design needs, other materials can be tested and graded as per the standard test method (国标/T 4207-2012).
It’s important to note that “固体绝缘材料” refer to materials that are solid during operation. Some materials, which are liquid at the time of supply and solidify upon application, are also considered solid insulation materials, such as insulating varnishes.