Keywords
equivalent circuit
dielectric loss tangent
water micro-inclusions
treeing
dielectric spectroscopy
relaxation processes полиэтиленовая изоляция
электрическая схема замещения
тангенс угла диэлектрических потерь
водные микровключения
триинги
диэлектрическая спектроскопия
релаксационные процессы
How to Cite
Abstract
It is shown that application of the high-frequency relaxation spectroscopy is expedient at the analysis of processes of appearance of free moisture in the polymeric insulation of power cables. The calculated and experimental frequency dependences of dielectric loss tangent on the degree of humidification of cable insulation are given. It is revealed that at prolonged moistening of insulation the peaks of relaxation losses are displaced into area of higher frequencies and there are the additional maxima corresponding to dispersion of energy dissipation in the new elements of insulation. The range of change of frequency of relaxation losses depends on concentration of free moisture in insulation and its electro-physical and morphological properties. References 19, table 1, figure 5.
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