江苏春晨电缆有限公司生产移动抗拉扁电缆YCB450/750，
35~66kV及以下系统（中性点经消弧线圈接地或不接地)，K=4.0；
35 ~ 66kV and below system (neutral point is grounded or ungrounded through arc suppression coil), k = 4.0;
110~154kV系统（中性点经消弧线圈接地)，K=3.5；移动抗拉扁电缆YCB450/750
110 ~ 154kv system (neutral point is grounded through arc suppression coil), k = 3.5;
110~220kV系统（中性点直接接地)，K=3.0；
110 ~ 220kV system (neutral point is directly grounded), k = 3.0;
330kV (中性点直接接地)，K=2.5；
330kV (neutral point is directly grounded), k = 2.5;
500kV (中性点直接接地)，K=2.18。
500kV (neutral point is directly grounded), k = 2.18.
随着电网电压等级的提高及对雷电过电压的防护措施及避雷器保护性能的不断提高，操作过电压已成为超高压电网绝缘设计的主要依据，对带电作业的安全距离及绝缘工具的绝缘水平起着决定性的作用。
With the improvement of the voltage level of power grid, the protection measures for lightning overvoltage and the protection performance of lightning arrester, the operation overvoltage has become the main basis for the insulation design of UHV power grid, which plays a decisive role in the safe distance of live working and the insulation level of insulation tools.