高压充油电缆漏油故障定位方法应用及探讨

The Discussion and Application on the Method of the Fault Location for the Leakage of the High-Voltage Oil-Filled Cables

高压充油电缆因其电气性能稳定而广泛应用于输配电领域,但却容易受外力破坏或者其它原因导致渗油漏油。对可能用于充油电缆漏油故障定位的几种方法进行了分析,探讨了其适用范围和各自的优缺点,并进行了改进,拓展了适用范围。对充油电缆发生漏油故障时,压力降与流量的变化关系进行了分析,提出了压力-流量比例的方法,将统计学观念应用于漏油故障定位,以提高定位精度。此外,还对负压波在充油电缆漏油故障定位中应用的可行性进行了探讨。

The high-voltage oil-filled cables are widely used in the field of the power transmission and distribution, with the stable electrical propertieso However, they are easy to be damaged by external force, which could results in a leakage. The possible methods that can be used for the leakage location for the oil-filled cable is analyzed in this paper. Moreover, we have discussed the range of application, both the merit and demerit for each method, and some improving advices for this methods are put forward so as to expand the range of application. The relationship between the pressure drop and the flow is also analyzed, and a new method, pressure-flow ratio is proposed, which apples the statistics concept to the leakage fault location so as to improve the accuracy. Besides, the feasibility of the negative pressure wave used for the fault location for the leakage is also discussed in this paper.