High Voltage6--110kv XLPE Insulation PVC Sheathed Power Cable

 1.Rated Voltage of Cable:

        U0 is the AC rated voltage (effective value) of metal screen,metal armor and metal sheath of conductor used in cable design.The insulation structure design of cable and electric test all adopt U0 as the standard.It reflects the insulation level of cable.

      U is the AC rated voltage (effective value) of phase conductor in cable design.It is not only related to insulation level of cable,but also to system earthing style and cable category in using cable.

     Um is the maximum value of the ''highest system vlotage'' to be borne by equipment.

2.Category of Cable

    According to the sustained time of earthing breakdown,cable is divided into two categories:

    Category1:the sustained time of earthing breakdown does not exceed 1 minute,it requires a system when any phase conductor contacts the earth or earthing conductor,can separate the phase conductor with the system in 1 minute.

   Category 2:the sustained time of each earthing breakdown usually should not exceed 1 hour,the longest not exceeding 8 hours and the accumulated time in a year should not exceed 125 hours.

    For the insulation level of two categories of cable,see the following table.

Table 1 category and rated voltage of cable:

3.The Cable Make-ups:

4.Technical Parameter:

Table 2:At 20s℃,the DC Resistance should not be greater than the largest DC Resistance in the table:

 Packing type:strandard woooden drum

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