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This paper investigates into the power cable used in HFAC Power Distribution Systems (PDSs) and recommends new cable types that could be used to improve the performance. While using the same materials and trying not to increase the weight per unit length, the cross section of the cable has been modified to minimize the losses observed in HFAC applications. With higher operating frequencies, the skin...
The internal and external semiconductors in the power cable have semiconducting properties and serve as a polymer material to prevent the concentration of electric fields that may occur between the insulator and the conductor and to uniformly distribute the electric field radially. In this paper, we will construct a model cable using commercial and Nano-semiconductor and evaluate long-term reliability...
The core temperature of power cables is a key supervising factor which concerns the operation safety of transmission line. However, direct measurement influences insulation performance due to embedding instruments into the cable. In this paper a measurement method using temperature retrieval is proposed. The finite element models of the cable are established for excavating the implicit relationships...
China is the world's largest cable producer and eccentricity is an important indicator to measure the quality of cable. Lack of online detection technology has been the soft underbelly of China's cable industry development. The online detection technology is monopolized by few enterprises, and domestic online detection equipment all rely on imports which seriously affects the China's cable industry...
Power cable insulation aging affects the safe operation of the power system. Detection and prediction of the insulation aging status makes it possible to replace, repair and maintain the cables in time. Coplanar capacitive sensors are widely used in non-destructive with the advantages of single-side access, adjustable signal strength and tomography capability. In this paper, capacitive sensing for...
This paper present a computer aided design for the underground power cable network. This can be help for finding the ampacity of cable which is based on many parameters such as cable conductor cross-section area, ambient temperature, Soil thermal resistivity, depth of burial, type of duct bank material, conduit material, type of cable installation etc. Moreover this paper examines several commonly...
Design of power cables with distributed fiber-optic temperature sensor is discussed. Typical technical characteristics of the developed systems of temperature monitoring of cable lines are presented. Assessments of the magnitude of possible measurement errors due to the inaccuracy setting parameters of the environment for calculations are given. The experience of application of the fiber optic temperature...
The rising demand for HVDC crosslinked polyethylene (XLPE) cable systems has put many novel products and solutions on the market within the recent years. In order to assess electrical performance of physical interfaces, DC breakdown studies of XLPE cable samples have been performed. For these samples, the surface of the XLPE in the cable ends has been modified using different techniques. Besides changing...
Continuous development of urban areas and extending industrial zones have lately generated an accentuated trend in the transition from aerial electrical lines to cable lines. At the same time with this transition, a number of problems occurred connected to the normal operation of the power cables and their use in powering domestic and industrial electric consumers. This work discusses actual issues...
The optimization of network capacity utilization is becoming increasingly important in an electric distribution network (EDN) with the variation in load demand due to seasonal changes and uptake of new technologies such as photovoltaics, batteries, electric vehicles and distributed generation. The proliferation in the use of these technologies introduces uncertainties in future load demands and increases...
Traditionally, Extra High Voltage (EHV) transmission systems consist exclusively of Overhead lines (OHL) but in the recent years the utilization of High Voltage AC (HVAC) underground power cables (UGC) is increasing due to environmental, political and operational aspects. The application of EHV cables will influence the operation of the transmission system in both steady and transient state. Therefore,...
The Romanian power grid was developed in the 60 and 70 and for that reason some major maintenance works should be done from time to time on the OHL. The mechanical condition of the lines has to be improved by replacing the tower anchors. One of the main concerns in the current strategy CNTEE TRANSELECTRICA S.A. is to ensure a reliable and economical operation of power grids. Higher requirements for...
In Variable Frequency Drive (VFD) systems, long motor leads can have many detrimental effects, including cable charging current, overvoltage at the motor terminals, and voltage stress on power modules. Different types of AC system grounding can also interact with long motor leads to yield undesirable effects on drive operation. Analyzing models of various components of a drive system is useful to...
The safe operation of 110 kV substation is of great significance to ensure the supply reliability of city power grid, and many of the 110 kV substation are facing challenges including aging and high failure rate of electrical equipment, thus live working is an important technical means to ensure the safety operation of electrical equipment in the substation. The electrical equipment layout is compact...
Electrical and electronic equipment used in aerospace applications must be designed to operate over a wide range of environmental conditions that include variations in pressure, temperature, and humidity. Electrical power systems for advanced aircraft utilize voltages well above the traditional levels of 12 to 42 VDC and 115/200 VAC, 400 Hz. Current airborne systems can contain 270 VDC, and bipolar...
Aiming at the overheating problem of cable joint, a 3-D finite element model of a single-core cable joint considering the coupling of electromagnetic field and temperature field has been built. In order to consider the heat losses generated by contact resistance of cable joint, the equivalent conductivity is calculated. The validity of the model and calculation method is verified by the comparison...
The ampacity of underground power cable lines is limited by the maximal allowable temperature of the conductor. Normally the IEC 60287 standard is used for steady state ampacity calculation. The standard employs the concept of thermal equivalent circuit. An alternative to the standard is the finite element (FEA) simulation of electromagnetic and thermal field around cables. This paper presents a systematic...
Jackets furnish mechanical protection for cables during installation and heat cycling. Jackets retard the ingress of water and earth chemicals into the underlying core. Jackets over metallic shields, sheaths and concentric neutral wires also provide protection against corrosion.
Reliability of underground Extra High Voltage (EHV) cable systems is undermined by third party mechanical damages. In order to prevent long and expensive outages, the Italian TSO equipped some cable lines of strategical importance with additional protective structures. The presence of highly permeable and conductive material surrounding the cable installations has risen concerns about potential variations...
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