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Influence of electrical joint compound on electrical contact overheating energy consumption is studied in this paper. The high current test were made under different current(400A、600A、800A and 1000A). Aluminum-aluminum connections are selected to conduct contact resistance test and temperature rise test. The results show that contact resistance is reduced about 50%, and the temperature of electrical connection decreased 20°C. The results show that there is remarkable effect after applying the compound. Electrical joint compound can reduce overheating defects and increase the reliability of electrical connection. Introduction Overheating of electrical contact is a very common phenomenon during the service of transmission and transformation equipment. It occurs at the connection joints of network [1-3] and super high voltage equipment and super current lines [4]. The overheating defects are always a serious problem in electric network. The overheating of electrical contact not only increases wastage, but also causes a transformation accident. With the increase of running load, the overheating defects of electrical contact become more frequency and serious. Many researchers studied the formation of the overheating defects, electrical contact materials, corrosion mode, equipment degradation, incorrect operation, service environmental, et al [5-7]. Moreover, some researchers proposed the prevention methods to reduce overheating, which are useful in the safety of network [8]. However, they only focused on practical phenomenon and lacking the analysis of mechanisms. In this paper we investigated the application of electrical joint compound, which demonstrated to be one of the most effective materials to solve overheating problem. Experimental materials and methods Wire clip is chosen according to the standard requirement and the size is 100 mm×60mm. Fig. 1 shows the sketch of tested samples. Punch two holes in the top of aluminum wire clip and fix every two board together with bolt. According to the samples were painted with electrical joint compound or without, the samples are classified into two categories: A: Polish the contact surface and clean with alcohol, then put them together and tighten up with nut. B: Polish the contact surface and clean with alcohol, evenly paint the surface with 0.2mm-thick electrical joint compound; put the surface together and tighten up with nut. 2nd International Workshop on Materials Engineering and Computer Sciences (IWMECS 2015) © 2015. The authors Published by Atlantis Press 128 Fig. 1 Sketch of tested samples. The experimental electric current is set at 400A, 600A, 800A, 1000A, respectively. Two holes in the top of aluminum wire clip were used to fix two boards together with bolt. The contact resistance is measured using digital micro-ohmmeter, and the schematic of measure method is showed in Fig. 2. Fig.2 Schematic of high current test Experimental results and discussion The temperature rise rate of electrical contact can directly indicate the heat loss and electric energy loss. This experiment found the relationship between temperature of electrical contact and working time, as shown in Fig. 3 and Fig. 4. The highest temperatures of electrical contact with and without electrical compound are shown in the Fig. 5. It can be seen from the Fig. 3 and Fig. 4, the temperature increase with the time, while the higer the current is, the higer the temperature rise rate is. For example, for the samples of A, the temperature of electrical contact rise slowly during 20 minutes from 21.0°C to 22.8°Cunder the condition of 400A, while the temperature rises rapidly during 20 minutes from 21.0°C to 64.9°C under the condition of 1000A. With further extension of time, the temperature of A and B samples arrive at 40.2°C and 230.5°C by the end of the test. After test, the color of localized pitting area becomes dark. However, there is no significant change in contact surface of sample. For the samples B, it can be seen that the temperature is about 44°C under the condition of 400A, which is similar to that of samples A. As for the 1000A, the temperature is 210 °C, which i than that containing electrical joint compound, as shown in Fig.5. It means electrical joint

Influence of Electrical Joint Compound on Electrical Contact Overheating of Overhead Line