Summary
In this paper, first field measurement results of a spatially-resolved diagnostic method for power cables will be presented. This new method, presented for the first time at Jicable’15, uses travelling waves and their interference characteristics to generate local energy losses inside the test object (i.e. power cables). The losses can be measured and provide a qualitative indication of the local physical condition of the cable insulation using a mathematical correlation with additional model calculations. The measurement principle itself and the fundamental approach for laboratory measurements will be briefly introduced. In this laboratory setup power cables were substituted for coaxial signal cables to minimize the required effort and space without losing the general characteristics of coaxial power cables. For the field application, several optimizations and first field measurements had to be performed with the goal of receiving boundary conditions for the operation in field environment, which will be specified in this article. Especially external influences such as multiple reflections caused by cable joints or measurement noise require a further in-depth analysis. The main part of the paper will be focused on a presentation of laboratory tests and first measurement results of medium voltage power cables in the field. The tested cable lines consist of paper-insulated lead covered (PILC), XLPE-insulated cables or are mixed lines of these two cable types. With the aid of this new method, measurement results of single segments of the tested cable lines can be diagnostically interpreted and will be presented in this article. As future work, the field measurements will be continued to improve the results by a further development and optimization of the diagnostic method. Finally, the goal is the development of a prototype system to transfer the functional laboratory setup into field operation and to verify the expected results for different types of cable lines. The combination of this new approach with other diagnostic methods could lead to a nondestructive and powerful diagnostic tool with spatial resolution.
Additional informations
| Publication type | ISH Collection |
|---|---|
| Reference | ISH2017_454 |
| Publication year | |
| Publisher | ISH |
| File size | 820 KB |
| Pages number | 6 |
| Price for non member | Free |
| Price for member | Free |
Authors
C. WEINDL
