Current Carrying Capacity Of Power Cable Research Articles

Simulation and Calculation of Temperature Field and Current-Carrying Capacity of Power Cables under Different Laying Methods

Precisely determining how cables distribute their current-carrying capacity and temperature field is crucial for the dependable and cost-effective functioning of power grids. Firstly, the power cable structure and the advantages and disadvantages of different laying methods are analyzed in detail. Secondly, the theoretical model of current-carrying capacity calculation and temperature field of power cables, including heat convection, heat conduction, and heat radiation, is constructed, and the method for calculating cable current-carrying capacity, relying on the double-point chordal interception method, is suggested. Then, the COMSOL multiphysics 6.2 finite element simulation software is utilized to create a simulation model that aligns with the real cable laying technique. Finally, the current-carrying capacity and temperature field of power cables are simulated and analyzed for different arrangements of power cables in three laying modes, namely directly buried, row pipe, and trench. The simulation results show that the cable laying method greatly affects the cable’s carrying capacity; the more centralized the cable distribution, the smaller the flow. The method can be realized in different ways of laying power cables in the real-time rapid calculation of flow as the actual laying of power cables has an important reference and reference significance.

Impact of thermal backfill parameters on current-carrying capacity of power cables installed in the ground

Impact of thermal backfill parameters on current-carrying capacity of power cables installed in the ground

Research on the Method of Improving the Current-carrying Capacity of Power Cable

The inadvertent current carrying capacity of power cable is bound to be affected by many factors, such as air temperature, ground temperature, backfill sand, soil covering depth, grounding mode, soil thermal resistance coefficient, number of circuits, ventilation design, laying mode, groundwater, metal sheath circulation, layout mode, solar radiation, surrounding heat source . This paper analyzes the common factors in the work, and expounds the mode of flow promotion through the analysis and numerical calculation of power cable ampacity. It also compares the effects of the two methods, hoping to provide new ideas for the follow-up research on related issues.

Design of Power Cable Lines Partially Exposed to Direct Solar Radiation—Special Aspects

Power cable lines are usually buried in the ground. However, in some cases, their ending sections are mounted along the supports of overhead lines. This leads to a situation where the cables are exposed to direct solar radiation and, consequentially, overheat. The paper presents the advanced computer modelling of power cables’ heating, considering their insolation as well as the effect of wind. The temperature and current-carrying capacity of power cables—during exposure to direct solar radiation—are evaluated. An effective method of limiting the unfavourable impact of the sun is discussed. In the presence of solar radiation, the proposed method enables a significant increase in the power cables current-carrying capacity.

Investigation on dielectric breakdown behavior of thermally aged cross-linked polyethylene cable insulation

With the rapid development of industry and the increasing demand of power supply, the rated voltage class and current-carrying capacity of power cables become higher and higher, causing the severer service and testing conditions for high voltage (HV) power cables. Therefore, the requirement of the quality of cable insulating materials also becomes increasingly higher. The dielectric breakdown strength is one of the most important indices characterizing the quality and present status of insulating materials, and insulating materials and systems undergo dielectric breakdown tests during development and service. A lot of research results on the dielectric breakdown characterization of polyethylene (PE) and cross-linked polyethylene (XLPE) have been reported up to now, however, few systematic investigations about the dielectric breakdown behaviors of the thermally-aged XLPE cable insulation have been reported in details. Generally, the behaviors of dielectric breakdown for HV insulating materials and structures have been known to obey some statistical distributions, including the Weibull statistical distribution. The changes of the parameters characterizing the Weibull statistical distribution, e.g. the scale and shape parameters may be closely related with those of the physical and chemical properties of the insulating materials considered. This paper aims to investigate the behaviors of the changes of the Weibull statistical parameters for XLPE cable specimens with the different degrees of thermal aging and to elucidate their mechanisms. The investigation results show that the dielectric breakdown characteristics of thermally aged XLPE cable insulating materials also fit well with the Weibull statistical distribution and the changes of their Weibull statistical parameters are very sensitive to the degree of thermal aging, which can be effectively used for the diagnosis of PE or XLPE cable insulation and the analysis of its degradation mechanisms.