求翻译：通过对XLPE电力电缆局部放电在线测试方法的研究，介绍了几种局部放电在线测试方法的原理，结合实际情况对它们进行了分析、比较，分别指出它们的优缺点。是什么意思？

The xlpe power cable line partial discharge test methods, introduced the principle of several line partial discharge test method, the actual situation to them, respectively as compared to point out their advantages and disadvantages.

Through the power cable XLPE partial discharge test methods in the study, and describe a few of these partial discharge test methods in the theory and practice of the analysis, Comparison, and pointed out that they were the advantages and disadvantages.

Through to the XLPE power cable shelf depreciation online test method research, introduced several kind of shelf depreciation online test method principle, the union actual situation has carried on the analysis, the comparison to them, points out their good and bad points separately.

On-line testing method for partial discharge in XLPE power cable through the research, introduced the principle of several on-line partial discharge test methods, analysis, comparison of actual situation they are, respectively, point out their advantages and disadvantages.

正在翻译，请等待...