| 电缆接地箱的应用 |
| 添加时间：2017/7/28 16:03:19 浏览次数： |
| 电缆接地箱的应用 Application of cable grounding box 对于高压单芯电缆系统，应根据实际情况采用合适的电缆护套接地方式。工程应用中对短电缆一般采用金属护套一端接地，另一端经护层保护器接地的方式；对长电缆线路，一般采用电缆护套交叉互联的接线方式。当雷电波或操作波沿线芯流动时，电缆接头金属屏蔽层不接地端将出现过电压，易使护套产生绝缘损坏形成多点接地，出现很大的环形感应电流。为此，应在电缆接头处金属护套不接地点加装电缆护层保护器。 为防止电缆外护套绝缘在单相短路情况下加速老化，长电缆线路宜采用完全交叉互联的保护方式。金属屏蔽层采用混合连接方式时，应在单点接地保护方式电缆段加装回流线路合理地选择该段电缆的长度。 For high-voltage single-core cable system, proper grounding of cable sheath should be adopted according to the actual situation. In engineering applications, short cables are generally grounded on one end of the metal sheath and grounded on the other end of the protective layer. For long cable lines, it is generally used to connect the cable sheath. When ray waves or wave along the core operation flow, cable joint metal shielding layer ground terminal will appear over voltage, easy to produce insulating sheath damage form multipoint earthing, appeared a lot of circular induced current. To this end, the cable sheath shall be installed in the metal sheath at the end of the cable. In order to prevent the insulation of the outer sheath of cable from accelerating aging in single-phase short circuit, the long cable line should adopt the protection mode of complete cross connection. When the metal shielding layer adopts the mixed connection mode, the length of the cable should be rationally selected by the backflow line in the single-point earthing protection mode. |
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