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Silicone oil is a promising alternative insulating liquid especially for the sites where fireproofing and environment protection must be considered. In this paper, the chemical and dielectric performance of silicone oil-paper composite insulation system under thermal aging is discussed. Two kinds of oil-paper systems are tested: mineral oil and silicone oil (Shin-Etsu Chemical KF-96-20 Lower viscosity...
Cross-linked polyethylene (XLPE) insulation cable is widely used in distribution power system, so it is important to reasonably estimate cable insulation status. Cable insulation is mainly affected by high temperature and water tree. Therefore, in this paper, we use PDC method to evaluate cable insulation, which is non-destructive due to its low voltage. In order to find out the relationship between...
Power transformer winding clamping pressure is a critical parameter, which is directly related to transformer short circuit ride through capability. Mechanical impacts generated on the winding structure during short circuit faults, switching surges and other high current faults have a significant impact on the winding clamping structure and could lead to reduce the clamping pressure. The change in...
Due to the small ohmic resistance, such as the LFP battery, off-line state-of-health (SOH) estimation based on ohmic techniques faces a great challenge on measurement difficulty. The inaccurate measurement result of the ohmic resistance can cause a severe SOH error. This paper studies the influences of battery external resistance on the off-line SOH estimations using different model parameters in...
Frequency Domain Spectroscopy (FDS) technique has been widely used as a reliable tool to assess the condition of transformer insulation. It has been identified that FDS is largely influenced by ageing condition of insulation system including moisture in solid insulation. Therefore, adequate understanding on the influence of these factors on FDS is necessary to accurately interpret the condition of...
The uptake of Rooftop PV has been extremely rapid in Australia. An advantage is that it can reduce the load supplied by upstream power transformers. This in theory should make the transformer run cooler, and therefore extend the remaining life of its paper insulation. However, power transformers often fail on problems other than aged paper insulation, such as the on-load tap changer. This can be a...
Electrochemical storage devices are spreading in many applications. Nevertheless, the data given by the manufacturers are often few and not homogenous. Using these data a correct sizing for a given application results very difficult and usually the designers makes a rough design in which the expected lifetime is not known and the costs are not optimized. This situation depends, mainly, on the lack...
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