In this article the electric properties of conducting polymeric compounds with graphite filler was studied to obtain the information of its structural distinctions. It was defined, that the temperature dependences of the electrical resistivity of the investigated composite materials, which had different content of conductive filler, had the posistor properties. Their frequency dependences of dielectric permittivity were found dispersed at low‐frequency area. This phenomenon was explained based on the availability of “built‐in” charges at the boundary region to the particles of graphite of polymeric layer. It was determined by outflow of free charge carries from graphite to localized states in the polymeric matrix. The estimated thickness of “built‐in” charge, in the context of the model of concentric system of conductive particles in dielectric matrix is about a micron.
The general scheme of using self-repairing PolySwitch-type fuses to limit the current in photovoltaic systems of solar arrays and the resulting requirements for their parameters are analyzed. The possibilities of applying modern serial resettable fuses for solving the problem of increasing the reliability of solar panels are studied. In particular, it is established that currently available nomenclature of fuses of the PolySwitch type allows implementing protection of photovoltaic systems of solar arrays against current overloads at the level of photovoltaic modules. At the same time, for the implementation of such protection at the level of solar cells, it is necessary to develop fuses with lower values of electrical resistance in the conducting state and lower tripping currents.
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