The design of insulation systems for transport electrification assets is a growing challenge. Voltage, temperature, specific power, electric field, and thermal stresses are increasing substantially, and, in addition, power supply is going to be entirely controlled by power electronics. Ultra-fast switches, high modulation and carrier frequencies will cause further stress, and thus intrinsic aging, to materials and insulation systems. There is a risk that conventional design criteria and insulating materials used for a long time, and which have operational experience return, will not be able to guarantee specified performances and reliability. In addition to that, unpredictable aging processes and rates could cause unexpected and uncontrollable formation or growth of defects able to incept extrinsic aging mechanisms, as partial discharges, PD, that can dramatically reduce insulation life. This may cause concerns about long-term performance, safety, reliability of electrical and electronics components. A possible countermeasure is to conceive a redundant design, not in terms of larger insulation thickness or surface, but focusing on reliability. Indeed, an optimized design, driven by PD-free criteria, but upgraded using insulating materials which can effectively withstand the degradation action of PD, could be the most appropriate choice for electrified transportation asset components, when premature and unexpected insulation failure can be critical. This paper presents testing procedures for rapid evaluation of the capability of insulating materials to withstand PD. Surface erosion tests can provide PD-endurance evaluation of candidate materials in faster, and more informative, way than conventional accelerated life test carried out till breakdown of the test object, thus making easier the choice of appropriate insulating materials for reliable insulation design.
An Accelerated Testing Procedure to Evaluate and Compare the Resistance to Partial Discharges of Insulating Materials for Electrified Transportation Assets
21.06.2023
2391258 byte
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
Electrified Transportation Network
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