Partial discharge measurement is one of the most important diagnostic methods to detect local faults in insulation systems. Detection of local faults in low-voltage cables would be attractive for condition assessment of power plant secondary cables. The construction of low-voltage cables is different from the medium and high voltage ones, preventing the direct application of partial discharge detection in high voltage equipment pdf already developed models and methods.
An analysis of partial discharge detection and evaluation methods for low-voltage cable diagnostics are given in this paper. Some laboratory measurement results are also presented and the identified issues are described in this paper. PD are not a root cause for failures of low-voltage cables. PD do incept at their test voltage even in brand new condition. A major identified complication is the large number of discharge sites in the cables.
Wide-band methods are necessary to detect PD in low-voltage cables. Parameters exhibiting changes were found when new and faulty cables were compared. Check if you have access through your login credentials or your institution. This article is about rechargeable lithium-ion batteries. Chemistry, performance, cost and safety characteristics vary across LIB types.
Such batteries are widely used for electric tools, medical equipment, and other roles. NMC in particular is a leading contender for automotive applications. Lithium-ion batteries can pose unique safety hazards since they contain a flammable electrolyte and may be kept pressurized. An expert notes “If a battery cell is charged too quickly, it can cause a short circuit, leading to explosions and fires”. Because of these risks, testing standards are more stringent than those for acid-electrolyte batteries, requiring both a broader range of test conditions and additional battery-specific tests.
International industry standards differentiate between a “cell” and a “battery”. A “cell” is a basic electrochemical unit that contains the electrodes, separator, and electrolyte. Failure” in this case is used in the engineering sense and may include thermal runaway, fire, and explosion as well as more benign events such as loss of charge capacity. In this regard, the simplest “battery” is a single cell. 400 V, made of many individual cells. The term “module” is often used, where a battery pack is made of modules, and modules are composed of individual cells. However, this happens on opposite electrodes during charge vs.
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