电缆厂家
耐磨电缆使用特性
耐磨电缆使用特性Operating characteristics
1、 额定电压Rated Voltage
电缆额定电压U0/U(Um)为:0.6/1(1.2)kV
Rated Voltage of cable U0/U(Um)::0.6/1(1.2)kV
其中:Notes:
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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;
Rated A.C. Voltage between conductor and ground/metal screen;
U:电缆设计用的导体间的额定工频电压;
Rated A.C. Voltage between conductors
Um:设备可承受的“很高系统电压“的很大值。
The maximum system voltage which the equipments can be beared
电缆的额定电压应适合电缆所在系统的运行条件。为了便于选择电缆,将系统划分为下列三类:
The rated voltage of cable shall be applicable to system operation condition where the cable lain in. According to cable selecting, the system will be described as 3 types as follow:
——A类:任一相导体与地或接地导体接触时,能在1min内与系统隔离。
System category A —When any phase of cable conductor is contacting with earth conductor, the cable will be isolated with the system.
——B类:可在单相接地故障时作短时运行,但任何情况下不宜超过8h,每年接地故障总持续时间不宜超过125h。
System category B—The system is allowed to run for 8 hours, when the single-phase earth fault is existing. And the total earth-fault time of 1 year won't be above 125 hours.
——C类:包括不属于A类和B类的系统。
System categoryC —They are including all systems besides A and B.
注:在系统接地故障不能立即自动解除时,故障期间加在电缆绝缘上过高的电场强度,会在一定程度上缩短电缆寿命。如系统预期会经常地运行在持久的接地故障状态下,该系统应划为C类。
When the system earth fault can't be removed automatically, the life of cable will be shortened in some degree because of the over-high electric stess beared by cable insulation.
用于三项系统的电缆,U0的推荐值见表1。
The recommended figure of U0 see the book 1, which are suitalbe for the three systems.
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