Abstract
A medium voltage (MV) cable network is a substantial component of the distribution network. Present management of this grid segment is mainly based on the failure rate analysis, i.e., a rise in the number and kind of faults on the actual line means that its technical condition is getting worse. The efficiency of the power system is low and additional costs of repair works, supply interruption, difficulties in the investment planning and operation and maintenance works are necessary. The aim of the R&D works done in the realised project is to implement the management of the MV cable network based on the estimated condition of the individual cable line, obtained from diagnostic measurements. The diagnostic investigations of the cable lines are the reference. Many years of research work have led to the development of the Health Index based on diagnostic, technical and service data.
Highlights
The analysis has shown that, for 90% of defects of cables, the failure took place when either an increased intensity of partial discharges (PDs) or an increased PD level appeared in the cable as compared to the average PDs’ level in the whole cable line
2 shows the exemplary number failures that occurred within within years in cable depending on year of of 10 years in paper insulated lead covered (PILC) cable lines depending on the year of manufacturing of the cables
The results of the first stage of research work showed the key relationships between the data obtained from diagnostic measurements, technical data and the risk of failure of PILC cables
Summary
Development of the grid management’s efficiency is a challenge to each electric power grid operator. The off-line measurements, carried out with the cable line disconnected from the operating voltage, are possible. In such solutions, external voltage sources are applied. Special opportunities to analyse the aging processes in the individual cable lines can arise from the PD measurements, which enable one to find the localisation of the PD appearance [2,7,8,9] This is one of the tests enabling one to analyse the data as a function of the cable length [10,11,12,13]. Research to develop an integrated system for assessing the degradation of the cable insulation is carried out by Energa-Operator. Within the SORAL project, based on the obtained data, a cable health index for paper insulated lead covered (PILC) and cross-linked polyethylene (XLPE) cables is developed. Research and development works are cofinanced by the Polish government [30]
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