Study on the Effect of Cable Group Laying Mode on Temperature Field Distribution and Cable Ampacity

Abstract

The reliability and service life of power cables is closely related to the cable ampacity and temperature rise. Therefore, studying the temperature field distribution and the cable ampacity is helpful to improve the construction guidelines of cable manufacturers. Taking a 8.7/15 kV YJV 1 × 400 XLPE three-loop power cable as the research object, cable temperature is calculated by IEC-60287 thermal circuit method and numerical simulation method, respectively. The results show that the numerical simulation method is more in line with the actual measured temperature, and the relative error is only 0.32% compared with the actual measured temperature. The temperature field and air velocity field of cluster cables with different laying methods are analyzed by finite element method. The corresponding cable ampacity are calculated by secant method. The results show that when the cable is laid at the bottom of the cable trench, the cable current is 420 A, which is 87.5% of the regular laying. Under irregular laying mode, the temperature of cable is higher than that of regular laying mode and the cable ampacity is lower than that of regular laying mode. At the same time, a multiparameter online monitoring system is developed to online monitor the temperature, water level and smoke concentration of the cable.

A Multiphysics Analysis of Coupled Electromagnetic-Thermal Phenomena in Cable Lines

“…In many cases it can happen that the individual strands connected in parallel in order to make up a single phase are subject to non-uniform current distribution. This effect may lead to a significant temperature increase in the overloaded strands, sometimes exceeding the long-lasting admissible values, which may lead to shortening of cable insulation service "life" [3] and under certain unfavorable conditions it may lead to cable malfunction or insulation breakdown.…”

“…From the literature review it follows that the analysis of coupled electromagnetic and thermal fields for simpler geometries at in-door conditions has been considered by several authors. It should however be remarked that in practice much more attention is paid to the analysis of buried cables [3,7,10,16].…”

Optimization of Spatial Configuration of Multi-Strand Cable Lines

“…Since 1957, the publication year of the seminal paper by Neher and McGrath [1], much attention was paid by the engineering community to the problems related to computations of current distribution in such systems [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. Current distribution in multi-strand cable systems is uneven due to several factors, to mention skin and proximity effects related to strand geometry [3,5], the conditions of heat exchange with neighborhood [8,18,19], soil inhomogeneity, moisture, installation depth (if the cables are buried) harmonic spectrum of currents flowing through the cables [11], the presence of buried metal objects etc., to mention but a few. Analytical treatment of all these factors is hardly possible [20], therefore numerical methods, in particular the Finite Element and the Finite Volume methods, have found wide use for engineering purposes.…”

“…All these challenges have to be faced by the designers of cable supply systems. Their negligence may lead to serious malfunctions [13,17] or even fires of cable installations [18]. Such a situation has occurred during professional activities of the first author of the paper [16].…”

The Industrial Applicability of PEA Space Charge Measurements, for Performance Optimization of HVDC Power Cables

“…Energy efficiency in both high voltage alternating current (HVAC) and high voltage direct current (HVDC) transmission systems strictly depends on the cable design. One of the most important elements in a cable is the insulation layer [1][2][3]. For this reason, cable manufacturers are continuously testing dielectric materials that can provide the best performances [4,5].…”