中压电缆及附件基本原理.pptVIP

* * * * * * * * 4 * 4 * 4 * 4 * 4 * Cold shrink requires NO HEAT, FLAMES, OR TORCH----requires NO SPECIAL TRAINING------and in most products DOES NOT REQUIRE ADHESIVES to seal. These statements are obviously directed at heat shrinkable products (i.e. Raychem) If needed, understand the following information if a customer asks or says they have used cold shrink and needed adhesiveto seal. Note: The exception to no adhesives is the 5620K series indoor termination kits. We supply a tube of glue to seal the base of the termination where the ground strap exits. This will not be needed with QTIII. We also supply 2228 mastic in the SJ rejacketing kits because the cold shrink must fit over the large splice body and seal on the cable. In some cases this range is too great for the tube to shrink down enough. * Whether the cold shrink product is a termination or tubular product, cold shrink provides a live seal so it is always trying to get back to it抯 original size, providing a tight seal and interface. This is most important in medium voltage cable accessories (splices and terminations) as a tight, positive interface is necessary for long term reliability. It is important for our low voltage tubing (8420 series) for an effective moisture seal. Use the EPDM tube you installed and try to lift the tube away from the cable. Show the firmness of the rubber and the tight fit provided. * * Copyright ? 3M 2010. All Rights Reserved. 3M中国有限公司 西南技术中心 高翔 Copyright ? 3M 2010. All Rights Reserved. 主要内容 1. 中压电缆及附件基本原理 20′ 2. 3M冷缩终端的分类及安装工艺要点 30′ 3. 3M冷缩中间接头分类及安装工艺要点 30′ 4. 3M可插拔式电缆终端的安装工艺要点 20′ 5. 常见故障及分析 20′ 6. 安装过程演示 7. 提问及自由讨论 Copyright ? 3M 2010. All Rights Reserved. 中压电缆及附件基本原理 Copyright ? 3M 2010. All Rights Reserved. Copyright ? 3M 2010. All Rights Reserved. 1. 导 体 2. 导体屏蔽 3. 主绝缘 6. 护套 4. 5. 绝缘屏蔽 (4) 外半导电层 (5) 铜带屏蔽 屏蔽电缆的基本结构 以上为单芯中压屏蔽电缆的典型结构。中、高压电缆与一般低压电缆的主要区别是其完善的屏蔽结构，即具有导体屏蔽和绝缘屏蔽两层屏蔽结构，这两层屏蔽层与电缆附件的关系非常密切。 Copy