A reliable electricity transmission network has a vital role in modern society. The long service life and the capital intensity emphasize the importance of distribution network design and selecting good quality components. The thesis addresses quality related factors in underground cable connectors. The connections in underground cable connectors are widely established by screwing. The performa...

Abstract—The aim of this paper is to present a parametric study to determine the major factors that influence the calculations of current rating for both air and underground cables. The current carrying capability of the power cables rely largely on the installation conditions and material properties. In this work, the influences on ampacity of conductor size, soil thermal resistivity and ambie...

This paper presents an integrated approach to the maintenance strategy of the medium voltage underground grid of the Greater Lisbon area. This strategy, implemented by EDP Distribuição over the last 6 years, aims to reduce the cable failure rate. This assessment, completed through pilot projects and innovative tests, has also included reviewing and improving cable and accessory technology and a...

I n this paper, we present a robot system for inpipe inspection of underground urban gas pipelines. The robot is configured as an articulated structure like a snake with a tether cable. Two active driving vehicles are located in front and rear of the system, and passive modules such as a control module are chained between the active vehicles. The proposed robot has outstanding mobility oflered ...

The full-wave model of underground cables is presented. The solutions of this model in frequency domain, applied in underground insulated, cable is evaluated. To allow the inclusion of this formulation in EMT programs a rational vector fitting of the propagation constant, characteristic admittance Yc and the propagation function H in frequency domain is presented. The simulations in time domain...

One way to increase distribution network reliability is to replace traditional overhead lines with underground cables. To fully utilize these investments, network owners will have to adjust their reliability engineering methods to suit the new cable networks. In this paper different condition assessment methods as well as improved failure statistics for cable systems are considered. The paper i...

This paper presents a modified Jaya algorithm (MJaya) for optimizing the material costs and electric-thermal performance of an Underground Power Cable System (UPCS). Three power cables arranged in flat formation are considered. XLPE high voltage situated thermal backfill layer ensuring optimal cable system. The dimensions, material, conductor area selected as design variables optimization probl...

With power systems switching to smart grids, real-time and on-line monitoring technologies for underground distribution power cables have become a priority. Most distribution components have been developed with self-diagnostic sensors to realize self-healing, one of the smart grid functions in a distribution network. Nonetheless, implementing a real-time and on-line monitoring system for underg...

The superconductivity was discovered in 1911. In the same year, Sumitomo Electric Wire & Cable Works was established (Foundation was in 1897 as Sumitomo Copper Rolling Works), and laid the first Japan-made high-voltage underground cables. In 2011, we will celebrate the centennial anniversary of the discovery of superconductivity, and a high-temperature superconducting (HTS) power cable will be ...