The effect of short-term (3- and 6-h-long) periodic thermal aging was investigated at three different temperatures on PVC cables and PVC films. Three different temperatures (110, 125, and 140 °C) were used for aging PVC cables and one (110 °C) for PVC films. PVC films were prepared for the investigation containing 0, 30, 40, and 50 weight percent of dioctyl phthalate plasticizer (DOP). The effect of short-term thermal aging was monitored by electrical (dielectric spectrum and voltage response measurement) and mechanical (Shore D hardness) methods. From the loss factor measurements, different deducted quantities were calculated and compared with Shore D hardness, which has been shown to be a parameter reflecting the effect of short-term thermal aging on PVC insulation. The measurements revealed that Shore D hardness is not the best property for monitoring aging. Instead, increasing dissipated power and the shifting behavior of tan δ–frequency curves proved to be the best phenomena for assessing the impact of thermal aging. Simple deducted quantities may provide a basis for following short-term thermal aging.
The main aim of this study is to investigate the ageing process of Low Voltage cables in smart grid. In addition, the behavior of ageing phenomenon has also been investigated. The Low Voltage cable networks were developed decades ago and it is of utmost importance to make comprehensive study over the health of existing Low Voltage cable networks so as to avoid any unprecedented damage. Incessantly increasing energy demand and distributed generation makes it among top priorities to investigate the ageing process of Low Voltage cables.The effect of thermal stress over dielectrics was investigated as a part of research. To be able to determine these effects the measurements were done on PVC insulated (both cores and jacket) cable by measuring tanδ (dissipation factor), capacitance, return voltage of cable and hardness of insulations. In order to determine thermal effects on dielectric, the measurements were done in different ageing temperature ranges i.e. at 110 °C, 125 °C and 140 °C.The results of this study support the expectations. The mechanical and the electrical parameters of cable insulation are affected by thermal stress. The dissipation factor and the hardness are increased while the decay voltage slope ( Sd ) is decreased by ageing.
During the last couple of decades, many nuclear power plant operators are seeking the life extension of the operating nuclear power plants. This makes the condition assessment of major components in the plant an important topic. One such component is low voltage power and instrumentation and control cables, which are more than 1000 km in length and makes their replacement a severe cost burden. Since these cables during service are under high thermal and radiation stress, hence making the condition assessment of them inevitable. The thermal stress as compared to other stresses results in the structural change and hence effecting the electrical integrity of the cable insulation. In this work, the complex permittivity of the XLPE/CSPE based low voltage nuclear power cable will be studied under thermal stress. The potential electrical aging markers from the measurement will help in calculating the expected lifetime of the cable for the case of life extension of the nuclear power plants.
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