YJV2*70平方高壓電纜 電力電纜出廠價 返回列表頁

A類系統──該類系統任何一相導體與地和接地導體接觸時，能在1min內與系統分離
B類系統──該類系統僅包括單相接地故障短時運行的條件，接地故障時間應不超過1h, 但在任何情況下，Z長不超過8h每年接地故障總持續時間不超過125h；
C類系統──不屬于A類、B類的系統。
System category A──This category comprises those systems in which any phase conductor that comes in contact with earth or an earth conductor. is disconnected from the system within 1 min.
System category B ──This category comprises those system which,under faultconditions,are operated,are operated for ashorttimewith one phase earthed.This period should not exceed 1 h..Fora longer period, not exceeding 8h on any occasion, can be tolerated.The total duration of earth faults in any year should not exceed 125h.
System categeory C──This category comprises all systems which do not fall into A and B
電纜的型號Type of cable