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This paper includes the results of an investigation of high-voltage pulse effects on insulators of a 10-kV power line. Experiments have been performed by means of equipment that simulates the simultaneous effect of a pulse disturbance and a power line operating voltage. Critical levels of insulator flashover have been determined. These levels are dependent on the pulse disturbance duration, and a number of other effects. The electric characteristics of insulators degrade when high-voltage pulses are injected on an insulator with power ON. As a result, some insulators have been destroyed. The possible reason of destruction is the presence of latent defects. [ABSTRACT FROM AUTHOR]

In this article, the specificity of wastewaters formed at electroplating plants and problem of its treatment is considered. The purpose of this research is to suggest the technological scheme of wastewater treatment, for one of the typical electroplating plants. Standard research methods were used: gravimetrical, photometrical and fluorimetrical methods of liquid analysis to achieve this goal. This article presents the method of electroplating wastewater treatment, based on chemical precipitation, including addition of the various reagents for removing heavy metals from the effluents. Because of the laboratory research, the effects of pollutants removal are 91% (total iron) and 94.6% (suspended solids). These effects were achieved by the technological scheme that includes averaging and mixing several technological effluents, their chemical precipitation with NaOH, Ca(OH)2 and flocculant during an hour.