YJV8.7/10千伏电力电缆报价
简单介绍
本公司郑重声明: 1、签订产品质量保障书,承诺-不合格产品不出厂。 2、两年内产品质量跟踪服务,并将客户服务记录在档案保存20年。 3、确因产品质量问题,我公司将保修、包退、包换、满足客户要求
YJV8.7/10千伏电力电缆报价的详细介绍
电缆的额定电压应适合于电缆系统的运行状况,用U0/U(Um)kv表示。 U0-电缆设计用的导体对地或金属屏蔽之间的额定工频电压; U-电缆设计用的导体间的额定工频电压; Um-设备可承受的“zui高系统电压”的zui大值。 The rated voltage of the cable for a given applixation shall be suitable for the operating conditions in the system in which the cable is used,and is expressed in the form of U0/U(Um)kv Where: U0-The rated power-frequency voltage between conductors and earth metallic screen ,for which the cable designed; U - The rated power-frequency voltage between conductos, for which the cable designed; Um- The maximum value of the“highest system voltage”for which the equipment may beused. · 三相系统用电缆的U0值推荐如下表: The values of U0 recommened for cable to be used in three-phase systems are listed below:
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A类系统——该类系统任何一相导体与地和接地导体接触时,能在1min内与系统分离 B类系统——该类系统仅包括单相接地故障短时运行的条件,接地故障时间应不超过1h, 但在任何情况下,长不超过8h每年接地故障总持续时间不超过125h; C类系统——不属于A类、B类的系统。 |
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