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为解决供电容量需求不断增加与城市新建配电电缆线路困难的矛盾，需要提高现有配电电缆的输送能力，而合理利用应急负荷载流量可以动态提高电缆输电能力。为此开发了10 kV XLPE电缆应急负荷载流量计算软件；通过现场应急负荷载流量试验，验证了软件计算的正确性。研究电缆线路应急负荷载流量与电缆负荷状态及应急时间的关系，以及应急负荷载流量与敷设回路数的关系，并进行应急载流量的应用研究。结果表明：应急负荷载流量大于持续负荷载流量；给定的应急时间越短，对应的应急负荷载流量越大；当前负荷电流越低，对应的应急负荷载流量越大；随着回路数的增加，应急负荷载流量减小，但短时载流能力的效果更突出。在运行阶段，应急负荷载流量可用于提高电缆的短时载流能力；在电缆线路设计阶段，可以减小电缆截面或回路数，提高电缆线路的经济性；应急负荷载流量应用在电缆应急故障中，可以减少停电转负荷操作，极大提高供电可靠性。

In order to solve the contradiction between the increasing demand of power supply and the difficulty of building new distribution cable lines, we need to increase the transmission capacity of existing distribution cables, and we can increase the cable transmission capacity dynamically by using emergency load ampacity rationally. So a calculation software of emergency ampacity for 10 kV XLPE cable was developed, and the calculation software was proved to be correct by experiments. The relationship among the emergency load ampacity, load state of cable, and emergency time, and the relationship between emergency load ampacity and loops were studied. The application of emergency load ampacity was studied. The results show that the emergency load ampacity is higher than the continuous load ampacity. The shorter the emergency time, the bigger the emergency load ampacity is. The lower the operating current, the bigger the emergency load ampacity is. With the increase of loops, the emergency load ampacity decreases, but the current-carrying capacity at short time is more prominent. At operation stage, emergency load ampacity can be used to improve the current-carrying capacity of cables at short time. At the design stage of cable line, the emergency load ampacity can be used to decrease the cross-section or the number of loops of cable. When the emergency load ampacity is applied in the fault cable, the outage can be reduced, and the reliability of power supply is improved greatly.