长距离电力电缆多谐振系统耐压试验方法的优化

Optimization of Multiple Resonance Systems Withstand Voltage Test Method for Long Distance Power Cable

随着城市建设的快速发展以及供电需求的不断增加,越来越多的长距离、大截面高压电力电缆线路被投入使用,传统现场使用的单台耐压试验设备已无法满足电力电缆线路竣工验收及交接试验的容量要求。为此,在总结交联聚乙烯（XLPE）电力电缆竣工验收耐压试验方法和标准的基础上,提出了多谐振系统串并联接线方式的优化方法,并以某谐振系统进行的国内3条电力电缆线路耐压试验为案例进行了计算分析。研究结果表明：对于3个案例的耐压试验而言,其最优的接线方式分别是采用2台设备并联、单台设备、4台设备混联;采用最优接线方式时的谐振频率计算值与实测值之间的绝对误差分别为1.13、0.79、0.65 Hz;并且单台设备电流计算值与实测值之间的绝对误差分别为0.53、2.20、1.20 A。综上所述,多谐振系统接线方式优化方法在保证一定精度的同时,可实现长距离电力电缆变频耐压试验方案的优化。

With the rapid development of unban construction and increasing demand of electric power, a growing number of long-distance and large cross-section high-voltage cable lines are used. Traditional single withstand voltage test equipment is unable to meet capacitance of the cable lines for completion acceptance and handover testing. Therefore, we put forward an optimized series-parallel connection method for variable-frequency multi-resonant withstand voltage testbased on concluding the test-methods and criteria of cross-linked polyethylene（XLPE） power cables. Moreover, taking a type of variable-frequency multi-resonant withstand voltage test system for instance, we presented three domestic withstand voltage test cases. The results show that case one with two systems parallel connection, case two with single system and case three with four systems series-parallel connection are the best plans for the three cases of the withstand test. The absolute errors between the calculated value of resonant frequency value and the measured value are 1.13, 0.79, 0.65 Hz, respectively, and the absolute errors between the current calculated value and the actual value are 0.53, 2.20, 1.20 A, respectively. The cases prove that the optimized method of multi-resonant system connection can optimize withstand voltage test schemes for long-distance high-voltage power cable lines with the low error.