In static load tests vibrating wire strain gages are generally used. The advantage of vibrating wire sensors over more conventional electrical resistance or semi-conductor types lies mainly in the sensor output, which is a frequency rather than a voltage or resistance. The frequency output is easier to transmit over long cables and is unaffected by voltage drops such as those which can be broug...

Abstract As of today, the problem lack non-destructive methods for assessing state and determining residual life insulation electrical cables is relevant cable lines in operation, especially that have exhausted their service life. The research presented framework this article aimed at creating a technique insulation. study was carried out using computer simulation basic theoretical laws physics...

In South Africa, electricity is supplied through thousands-of-kilometers of overhead power cables, which is owned by Eskom the national energy supplier. Currently monitoring of these overhead power cables are done by means of helicopter inspection flights and foot patrols, which are infrequent and expensive. In this paper, the authors present the design of a prototype power line crawler (inspec...

8.17 Some Mechanical Principles Introduction Electric power can be transmitted or dis tributed either by means of underground cables or by overhead lines. The underground* cables are rarely used for power transmission due to two main reasons. Firstly, power is generally transmitted over long distances to load centres. Obviously, the installation costs for underground transmission will be very h...

Polyolefins have been widely used in the electrical insulation and cable industry in recent years. One of the main usages of these materials is dielectric insulation in coaxial cables. Low attenuation and high signal transmission speed are among the desired features in coaxial cables. The role of polyethylene foam on signal transmission speed in the coaxial cables is the main focus of this stud...

Until recently the electrical power industry has relied solely on traditional technologies copper and iron as cables, transformers and machines as the mainstream solution for the generation, transmission and distribution of power. Whilst use of these materials and technologies is here to stay, improvements in power semiconductor technology mean that the industry is moving into a position where ...

Partial discharges are caused by various defects such as voids, shield protrusions, contaminants, advanced stages of water tree, etc and known the main cause of breakdown in insulation materials. Partial discharge (PD) location is a powerful and useful tool for the maintenance and operation of electrical power distribution cables. This paper describes the application of two digital signal-proce...