66kV交流交联聚乙烯电缆线路改为直流运行的直流载流量

发布时间：2018-03-12 06:43

本文选题：直流载流量　切入点：交流XLPE电缆　出处：《高电压技术》2017年05期 　论文类型：期刊论文

【摘要】：将交流电缆线路改为直流运行是提高电缆线路输送功率的有效途径之一,确定交流电缆的直流载流量对电缆的交流改直流运行意义重大。为此,采用解析法和数值法分析了空气中敷设66 kV电压等级交流交联聚乙烯(XLPE)电缆的直流载流量,开展了直流载流试验;同时采用数值法计算了直埋敷设2根平行排列交流电缆的直流载流量,并计算了电缆改为直流运行后的输送功率。计算结果表明:对于空气中敷设的交流电缆,采用解析法和数值法得到的直流载流量与试验测试结果基本一致(780 A);直埋敷设交流电缆的直流载流量约为710 A;当交流电缆改为直流运行的工作电压取57 kV时,其输送功率和原交流系统相等。上述结果验证了解析法在计算高压(66 kV)电缆直流载流量时的适用性,同时为后续66 kV交流电缆线路改为直流运行奠定了基础。
[Abstract]:The conversion of AC cable line to DC operation is one of the effective ways to improve the transmission power of the cable line. It is of great significance to determine the DC current of AC cable for the AC to DC operation. The DC current load of 66 kV AC XLPE cable laid in the air was analyzed by analytical method and numerical method, and the DC current carrying test was carried out. At the same time, a numerical method is used to calculate the DC current of two parallel alternating current cables, and the transmission power after the cable is replaced by direct current. The results show that: for the AC cables laid in the air, The DC current obtained by analytical method and numerical method is basically consistent with the test results. The DC carrier current of direct-buried AC cable is about 710 A. when the working voltage of AC cable is changed to DC operation, the working voltage is 57 kV. The transmission power is equal to that of the original AC system. The above results verify the applicability of the analytical method in the calculation of DC current of high voltage (66 kV) cables and lay a foundation for the subsequent conversion of 66 kV AC cable lines to DC operation.
【作者单位】：东北电力大学电气工程学院;上海电缆研究所;国网辽宁省电力公司经济技术研究院;
【基金】：国家电网公司科技项目(5222JJ14002)~~
【分类号】：TM75

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