In this paper, we make a brief overview of the maintenance procedures and condition monitoring methods. The WKL32 model high pressure pump made in Iran Pump Co, be evaluated by the vibration analysis and sound tests, based on the proactive maintenance procedure. We study the effect of Electric current leakage which is made of using the pump chassis as the welding connection cable (NULL) and check the effect of the ambience temperature on the grease lubricant viscosity and on the corrosion of the pump’ s bearings. Finally, we make appropriate cures according to the proactive maintenance procedure.

The design and application of a fuzzy logic based controller to a leakage current relay was presented in this paper. A novel approach based on fuzzy logic to form the tripping action of leakage current relay was investigated. In addition to the theoretical aspect of fuzzy logic, detection of a leakage current, measurement of the leakage current, determination of its duration, trip opening of faulty cases and detailed system architecture were also introduced. The inspected fuzzy logic technique to control the tripping action of the leakage current relay was intended to improve the performance of conventional leakage current relay control for human safety and system reliability. The relationship between the controlled output of the fuzzy processor and properties of leakage current for the proposed relay was explored by using a graphical output expression. It was observed that the proposed leakage current relay based on fuzzy logic was more reliable than conventional leakage current relay.

This paper deals with results of leakage current measurements on 20 kV porcelain insulators. The measurements were performed in a time frame of one period (50 Hz) and the insulators were contaminated from a compound of salt and kaolin. The study was made via I-U characteristic curves plotted for one cycle of voltage application. The investigation of the observed phenomena showed that the response to the applied voltage is linear at first and thereafter takes the form of current pulses. Partial discharges (streamers), short and long duration arcs are the most likely physical phenomena detected experimentally. This assumption is convincingly supported from calculations of the average energy per pulse, which was found to be close to values reported in the related literature.

Background: The use of Electric current during application of etch-and-rinse adhesive systems has been recently introduced to decrease microleakage. This study investigated the effects of an Electric field produced by an experimental device for the application of a two-step etch-and-rinse adhesive on moist dentin surface.Methods: Sixty freshly extracted human premolars were used for this study. In order to simulate real conditions, the pulpal pressure was set to 35 cm H2O for all the specimens. The teeth were divided into two groups: in group I, etch-and-rinse system (Single Bond) was applied with Electric current while group II, etch-and-rinse system (Single Bond) was applied without Electric current. Specimens were prepared for dye penetration test. The data were analyzed using Mann-Whitney U test.Results: The results showed that group I had less microleakage scores compared to group II (P=0.047).Conclusion: Based on the result of this study, it could be concluded that using Electric current for applying adhesive systems had a significant effect on reducing microleakage.

In this paper, the parameters of Electric field and leakage current (LC) amplitude in polymeric insulator are calculated using finite element method (FEM) and predicted in the neural network. The variable angle and Electrical conductivity of water droplets are changed. Increased Electric field due to the presence of water droplets on the insulator surface causes the insulator breakdown probability. In this paper, for predicting the on the polymeric insulator leakage currents a neural network model was proposed, which could arrange for references to prevent contamination flashover. Through the study of a LC data obtained via the FEM simulation, the characteristics of the LC combined with BP neural network. Simulation results illustrate that enhancement in leakage current and Electric field values are created when the values of the Electrical conductivity and drop contact angle is increased.

In this research, various types of nitride additives were incorporated into titanium diboride attaining dense TiB2-based ceramics by field-assisted sintering technique. The addition of different types of nitride additives, namely Si3N4, BN, AlN, and TiN, significantly improved the sinterability of TiB2, achieving near fully dense ceramics. The X-ray diffraction analysis and microstructural evaluation confirmed the presence of the h-BN compound in all specimens. In the TiB2-Si3N4 ceramic, Si3N4 additive reacted with B2O3 oxide, in-situ generating h-BN, and SiO2 phases. Although the h-BN phase was produced in the TiB2-AlN specimen, the main proportion of AlN remained in the sample as an unreacted ex-situ phase. In terms of the TiB2-TiN ceramic, some of the nitrogen and boron atoms could leave the TiN and TiB2 crystalline structures, contributing to the in-situ formation of h-BN.