For the diagnosis of inhomogeneous insulation degradation in electric cables, the estimation of distributed shunt conductance is studied in this paper. Gradual growth of the shunt conductance is a consequence of degradation of the dielectric properties of the insulator. The proposed estimation method is based on voltage and current measurements at a single end of the cable. After the linearizat...

Flat multiconductor cable of the type used for mass insulation displacement connection (i.d.c.) typically has a characteristic impedance (Z0) in the 90 to 150 Ω range. In some applications, it is desirable to have less than half this Z0. A properly configured four-conductor configuration allows us to achieve a low Z0. This technique is extendable to printed-wiring flexible-circuits (flex circui...

Railway power transmission lines (RPTL) are that provide nontraction supply for railways, such as communications and signals along the railway. With advancement of technology, cables being used more widely. Operational experience has shown during operation cables, abnormal heat is often caused by fault factors poor joint crimping severe partial discharge insulation defects, leading to cable bur...

Mass Impregnated PPLP cable, which is applied to various high-voltage direct current (HVDC) projects due its excellent dielectric and temperature properties, has a problem wherein voids are formed inside the butt-gap cavitation. However, there been no previous research into technology for void defect identification insulation diagnosis on HVDC MI-PPLP cables. In this paper, propose an method de...

Knowledge of the spatial distribution and evolution of embedded charge in thin dielectric materials has important applications in semiconductor, high-power electronic device, high-voltage DC power cable insulation, high-energy and plasma physics apparatus, and spacecraft industries. Knowing how, where, and how much charge accumulates and how it redistributes and dissipates can predict destructi...

For the LHC upgrade projects, CERN will rely on the Nb3Sn technology to build high field dipole and quadrupole superconducting magnets. In the frame of this R&D program, cooling studies are carried out to determine the heat extraction from this new type of accelerator magnets and the relevant quench limits. In this paper we present and discuss experimental results of heat transfer through the e...

LDPE and HDPE are common materials used within high voltage insulation systems. These materials will be aged after working under high voltage for a long time. The ageing process of these materials may be affected by external factors. The application of repetitive lightning impulse over-voltages is one of these factors and will be considered in this paper. This paper includes the sample preparat...

The main purpose of this paper is to evaluate electrical tree degradation for cross-linked polyethylene (XLPE) cable insulation for three difference models. In order to show the distribution characteristics using phase resolved partial discharge (PD), we acquire data by using a PD detecting system. These acquired data presented four 2D distributions such as phase angle-average discharge distrib...