This paper explores the problem of overheating of solar modules as a result of exposure to sunlight. An increase in temperature above the standard leads to the degradation of solar modules and their premature decommissioning. Cooling the working surface is a key factor that must be considered in order to achieve higher efficiency in the operation of solar photovoltaic systems. Based on the considered methods of cooling and removing excess heat from the surfaces of the modules, an inexpensive and technologically advanced method for protecting solar modules from overheating using holographic films was proposed. The article presents the results of comparative laboratory tests of solar modules using such a holographic thermal protection. It is shown that when using a film, the SM performance does not change, and in some cases even gets better. The surface temperature of the module depends on the angle of its inclination to the horizon, which must be taken into account when choosing the location of installation of solar power plants. The experiments confirmed the assumption of effective protection of the modules from overheating using holographic thermal protection and showed its promise.
The reliability and operation safety of electrical equipment, as well as the level of electrical and fire safety at mining enterprises are directly related to the state of electrical networks insulation, and particularly the value of the total insulation resistance relative to the ground. Controlling these parameters in the electrical equipment operation allows increasing the efficiency and reliability of such equipment. The paper concentrates on the current problem of selecting methods to monitor the isolation parameters of the network phases relative to the ground in the distribution electric networks with an isolated neutral. It briefly describes “Zeravshan” joint venture, the isolation control system developed for it and the results of its computer model based operability tests. Studies have shown that at rated load in the network, the error in determining the total insulation resistance is under 20%, which proves the operability of the proposed network phase isolation monitoring system relative to the ground. Thus, the implementation of the developed insulation parameter monitoring system in distribution networks operation will improve the reliability and safety of power supply.
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