In many papers, the good behavior in operation and benefits offered by a certain type of insulator, classic (toughened glass or porcelain) or composite (fiberglass core and silicone rubber) for overhead lines, is often exaggerated and compared only with the disadvantageous characteristics of the other type of insulator. This paper present both the advantages and disadvantages of each of the two...

We examined in this work the effect of the inter-grains distributions as well as the scaling of the complex impedance in order to analyze its frequency dependance for composite metal-insulator films. The dependance of the characteristic frequencies on the inter-grain distribution is shown for large sample sizes. The impedance spectra become statistically stable above sizes of the order 200x200.

one of the important factors influencing outdoor insulators performance is pollution phenomenon. the pollution, especially during humidity condition, reduces superficial resistance of insulator and lead to a flow of leakage currents (lc) on the insulator surface, which may result in total flashover. the lc characteristics are affected by parameters such as nature and severity of pollution. loca...

Stress corrosion experiments were performed on unidirectional ECR-glass/polymer composites with the modified polyester, epoxy and vinyl ester resins for the use in high voltage composite insulator applications. Two types of ECR-glass fibers with low and high seed counts were investigated. The stress corrosion tests were performed in nitric acid under four point bending conditions and the resist...

We introduce a particle-hole-symmetric metallic state of bosons in a magnetic field at odd-integer filling. This state hosts composite fermions whose energy dispersion features a quadratic band touching and corresponding 2π Berry flux protected by particle-hole and discrete rotation symmetries. We also construct an alternative particle-hole symmetric state-distinct in the presence of inversion ...

Insulator detection is an essential task for the safety and reliable operation of intelligent grids. Owing to insulator images including various background interferences, most traditional image-processing methods cannot achieve good performance. Some You Only Look Once (YOLO) networks are employed meet requirements actual applications detection. To a trade-off among accuracy, running time, memo...

annually, a lot of imported heat insulator concretes, are used for which a considerable amount of exchange expenses are allocated. most kinds of these insulator concretes are imported during foundation and installation of the factories accompanied by primary facilities and supplies. even, after a short time the factories began to work, whenever the walls of the insulators are required to be cha...