Abstract
The charging and discharging currents of the cable polyethylene insulation before and after thermal aging were experimentally studied and analyzed. Analysis was carried out on the basis of equivalent Maxwell and Voigt circuits. Thermally stimulated depolarization current in open and shorted circuit and the kinetics of charge accumulation were studied. The nature of the charge accumulated in film by applying a constant electric field and the charge storage mechanism were determined.
Highlights
Polymer composite materials based on polyethylene are widely used in electrical insulation, capacitor and cable technology where the dielectric ability to accumulate and maintain a charge leads to negative phenomena
The absorption current and the charge accumulated in the dielectric decrease in peroxide crosslinked PE (PXLPE) films as shown in [6] and increase in SXLPE films by the factor of ten
Using the initial conditions (3), we get the expressions for the current of electrical insulation in the case of the relaxation polarization model, or Voigt equivalent circuit
Summary
Polymer composite materials based on polyethylene are widely used in electrical insulation, capacitor and cable technology where the dielectric ability to accumulate and maintain a charge leads to negative phenomena. The accumulation of volume charge in the operation of a cable at a constant voltage leads to a distortion of the electric field, thereby reducing the dielectric strength and lifetime of the insulation [1]. The study of the absorption properties of the cable insulation can provide information about the strength of the insulation affected by aging and the dielectric’s ability to store charge. The study of the absorption characteristics of electrical insulation is relevant. As is well known [2]–[4], absorption characteristics include charge current Ich(t) and discharge current Idis(t), self-discharge voltage Us(t) and restored voltage Ur(t). On the basis of experimental curves Ich(t), Idis(t), Us(t), Ur(t), a calculation of the dependence of frequency on the complex impedance Z ( ) and the complex dielectric permittivity ε(ω) over a low frequency range (10−5 s−1 to 1 s−1) was made
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