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Subject: search.filters.subject.Crosslinked polyolefin

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    The preliminary study of partial discharge behavior of crosslinked polyolefin (XLPO) unshielded cable insulation under temperature variations
    (2021-05-19)
    Singhasivanon, Jakawan
    ;
    Jirasuwankul, Nirudh
    An emerging of new material, XLPO, has now been widely used as power cable insulation and it is necessary and compulsory to perform compliant standard test. According to the IEC 60270, partial discharge (PD) test is the promised and nonintrusive method to determine quality of insulation. In this paper, XLPO insulation of the unshielded cable has been preliminary tested by measuring its PD behavior under different temperature exposure. The experimental results illustrate that occurrence of partial discharge inception voltage (PDIV) forms as parabola with a convex trend under temperature variations. It is also found that XLPO is less susceptible to PDIV when compared to PVC insulation under the same conditions.
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    An experimental study on dielectric response of the crosslinked polyolefin (XLPO) insulation of the unshielded cable under electric field and heat flux
    (2021-05-19)
    Singhasivanon, Jakawan
    ;
    Jirasuwankul, Nirudh
    Nowadays, crosslinked polyolefin cables (XLPO cables) are more popular and more famous for electrical insulation. In order to study and analyze the characteristics of insulation. The polarization and depolarization of current measurements (PDC measurement) is one of the advance methods that can compute and provide dielectric reaction parameters. In this paper, aim to study dielectric response of the XLPO insulation of unshielded cables under electric fields and heat fluctuations by measuring permittivity (ϵ′, r), conductivity (σ) and dissipation factors (Tan δ). The experimental results indicate permittivity is rather constant at different field strengths and temperatures and are similarly to XLPE insulation. It is also found that the activation energy of XLPO insulation is 0.77 eV. Future more, action energy in this research can excite electrons or ions in valent band within insulations to change the state from non-conductivity to conductivity.