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Author: search.filters.author.Jeenmuang, SiwakornSubject: search.filters.subject.underground cable

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    Dielectric Response Analysis Characteristic of Service-Aged XLPE Cables
    (2024-01-01)
    Thongkong, Patchara
    ;
    Promphanich, Wiboon
    ;
    Udomluksananon, Patt
    ;
    Jeenmuang, Siwakorn
    ;
    Wiangtong, Theerayod
    The main insulation used in plastic underground cables is cross-linked polyethylene (XLPE). The XLPE underground cable which has been utilized in service for a long time, has experienced various stresses, or so-called TEAM stresses. Consequently, the XLPE insulation will be degraded over time and lead to insulation properties degradation. This paper represents the dielectric response analysis technique for characterizing the insulation condition of the service-aged XLPE medium voltage underground cable. The dielectric response analysis was performed on the 22 kV XLPE underground cables that have been in service for more than 10 years and were directly buried. The dielectric response analysis measurement consists of a combination of polarization and depolarization current (PDC) measurement in the time-domain and frequency-domain spectroscopy (FDS) measurement. After that, test results were analyzed to evaluate the insulation condition and compare it to the new 22 kV underground cable. The analyzed dielectric response analysis test results will be reported in this paper.
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    Effect of Longtime Sheath Current on Insulation Screen of 115kV XLPE Underground Cable
    (2024-01-01)
    Jariyanurat, Kittipod
    ;
    Jeenmuang, Siwakorn
    ;
    Udomluksananon, Patt
    ;
    Kerdmanee, Sittipong
    ;
    Lacharochana, Sakda
    Due to the need to extend the life of underground cables that are universally installed and used in power plants in Thailand, The life assessment must be concerned with advanced techniques, both chemical and physical, exactly. The components that needed to be analyzed were divided into two main groups: the insulation and physical systems. One of the most requisites is pyrolysis. Pyrolysis can occur in the underground cable system with many factors, for instance, the ambient temperature, overload, loss of connector, and longtime sheath current. Thus, this paper described the effect of the longtime sheath current on the insulation screen of 115kV XLPE underground power cable. Sheath current that ran into the system for longtime effectively effected to the insulation screen by destroying the structure of chemical properties leading to the short lifetime and getting the high risk to breakdown with the continue use.
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    Effect of Sheath Current on the Lead Sheath of 115kV XLPE Underground Cable
    (2024-01-01)
    Jariyanurat, Kittipod
    ;
    Jeenmuang, Siwakorn
    ;
    Chumpiboon, Komin
    ;
    Kerdmanee, Sittipong
    ;
    Lacharochana, Sakda
    Currently, underground cable systems are extensively employed in power generation and distribution due to their superior reliability, stability, and safety. Given the significant investment and critical role of these systems, it is essential to rigorously assess their lifetime and performance. Key factors affecting the lifespan and life assessment of underground cables include the insulation system and the physical components of the power cable. Among these, sheath current is a notable factor that contributes to cable deterioration. This paper investigates the impact of prolonged sheath current on XLPE power cables, which have been in operation for approximately 25 years, associated with a 115kV generator unit. Specifically, the study focuses on the degradation of the lead sheath due to sheath current exposure. It was observed that the lead sheath exhibited signs of degradation, including tracking, which affected various layers, such as the lead sheath itself, the semi-conductive tape, and the semi-insulation. The research highlights that while sheath current did lead to observable tracking on the lead sheath, the overall impact on the cable's lifetime was minimal. An analysis of the lead sheath's properties, based on fundamental physical characteristics, revealed that long-term exposure to sheath current primarily caused minor physical tracking on the sheath's surface rather than significantly affecting its lifespan. This finding suggests that although sheath current can induce localized degradation, its effect on the overall functional longevity of the lead sheath is relatively limited.