Cable links with a high current load become more usual, especially with wind power generation and third party access to mv cable networks. Analyses of failed medium voltage joints from high loaded cable links in The Netherlands tend to indicate that thermo-mechanical forces play an important role in most failure mechanisms. Theoretically, huge forces can be expected on MV joints, due to the expansion of the conductors. In order to compare the theoretical forces with those that can actually occur during the real life of the accessories, the forces exerted by the widely used stranded compacted and solid aluminium conductors of 240 and 630 mm² were measured. This paper presents the results of those measurements and points out that those forces are never considered during the qualification of the accessories according to the relevant standards.
The permitted ampacity for a MV-cable is currently based on tables [1] which hold into account the placement of the cables and derive the permitted load. These tables are limited to the most used placement setups and load cycles. In recent years it is also possible to simulate the coretemperature of the MV-cable by using simulation software. This software can hold into account more complex burying principles and can simulate the temperature based on different and more complex load cycles. Eandis uses this software to simulate the thermal effects of cables installed at greater depths, using directional drilling. Due to the greater burying depth, the software indicates that the ampacity of the cable is decreased significantly (up to 50% in some cases). By using a fibre optic (FO) cable and measuring device, the theoretical results, as simulated by the software, can be compared with real-time measurements.
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