Condition-based maintenance of high-voltage machines-a practical application to electrical insulation

Trnka, Pavel; Sirucek, Martin; Svoboda, Michal; Soucek, Jakub

doi:10.1109/mei.2014.6701105

Cited by 14 publications

(7 citation statements)

References 24 publications

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“…Furthermore, the detection of PD cannot analyse the insulating status and predict remaining useful lifetime. Currently, related work on the electrical‐insulation system of power plant generators have been carried out with the combined stress of thermal, electrical, mechanical, and chemical stress to a establish a mature degradation model [160]. In this regard, the electric machines can refer to the degradation model to avoid possible failure in MEA. Wide‐bandgap (WBG)‐based semiconductors (SiC, GaN) are emerged as the shimmering components of next‐generation power device due to its inherent characteristics with higher current density, junction temperature, and switching speed.…”

Section: Problems and Prospectsmentioning

confidence: 99%

A review on insulation challenges towards electrification of aircraft

Jiang

et al. 2023

High Voltage

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Compared to the traditional aircraft, electrification of power system in aircraft has potential to revolutionise the aviation industry. Typically, more-electric aircraft (MEA), even all-electric aircraft has been developed and delivered to decrease the greenhouse gas emission and increase the energy efficiency. The next generation of MEA will operate at high voltage to facilitate the transfer of significant levels of electrical power in an electrified aircraft. However, the higher voltage inevitably leads to an increased risk to the insulation of the electrical components and power system. This study aims to provide a critical overview of the insulation challenges from the perspective of electrified aircraft, typically MEA application. The development of MEA and the special working conditions are explained at the beginning. Then the insulation challenges of power modules, electric machines, aeronautical cables etc. are discussed in detail. Finally, the existing technical barriers and future prospects of insulation for electrified aircraft are summarised. It provides a reference for the future design and test in power system of next generation MEA and related electrified air transportations.

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Section: Problems and Prospectsmentioning

confidence: 99%

A review on insulation challenges towards electrification of aircraft

Jiang

et al. 2023

High Voltage

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“…The electrical aging of HDIM is described by many publications as depending on the Gibbs free energy, bond destruction energy, or cohesion energy associated with internal defect creation due to local and applied electric fields [4,[16][17][18]. The motion of charge carriers between defect sites either with or against an applied electric field can be modeled as a rate process similar to the hopping conductivity models of Miller and Abrahams or the standard Crine aging model which assume a single mean defect energy and density [4,6,19,20]. Static voltage time endurance tests of LDPE strongly suggest a need for the inclusion of multiple defect species [8].…”

Section: Statistical Analysis Of Electrostatic Breakdownsmentioning

confidence: 99%

“…Enhanced understanding of DC aging based on expanded experimental studies is of critical importance not only to understand the physics of highly disordered insulating materials (HDIM), but also for applications in spacecraft charging, high voltage DC power transmission and switching, thin film dielectrics, and semiconductor devices and sensors [1][2][3]. Recent literature on DC power cable aging calls for better models and more data on the details of electrical ageing in HDIM under DC high electric fields, especially with regards to finding a DC equivalent for AC partial discharge diagnostic tests [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Pre-breakdown arcing and electrostatic discharge in dielectrics under high DC electric field stress

Andersen

Dennison

2014

2014 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)

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Highly disordered insulating materials exposed to high electric fields will, over time, degrade and fail, potentially causing catastrophic damage to devices. Step-up to electrostatic discharge (ESD) tests were performed for two common polymer dielectrics, low density polyethylene and polyimide. Prebreakdown transient current spikes or arcs were observed, using both slow and high speed detection. These pre-ESD discharge phenomena are explained in terms of breakdown modes and defect generation on a microscopic scale. The field at which prebreakdown arcing begins was compared to the onset field for electrostatic discharge at which complete breakdown occurs for each material studied. We present evidence that these two threshold fields are the same. Thus, the important parameter to consider in design may not be the maximum field for breakdown, as much as the defect structure in the materials and the field where pre-breakdown arcing begins in a material.

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“…Therefore insulation assessment and monitoring during the operation through simple and inexpensive methods have been a fundamental issue [1][2][3]. On the other side, in most electrical motors and generators the expected stator winding life time depends on the electrical insulation [4].…”

Section: Introductionmentioning

confidence: 99%

Influence of ambient and test conditions on insulation resistance/polarization index in hv electrical machines - a survey

Torkaman

Karimi

2015

IEEE Trans. Dielect. Electr. Insul.

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Ambient and test conditions can affect the analysis results of the insulation system testing in high voltage (HV) electrical machines. In this context, insulation resistance (IR) and polarization index (PI) are two common techniques for winding insulation assessment in offline mode. This paper investigates the influence of main parameters that affects IR/PI tests results. Temperature, humidity, and pressure are the wellknown environmental parameters which could affect dielectric parameters of insulation such as IR and PI. On the other side, test voltage level and voltage polarities connections are two prominent factors in sampling the resistance during the test. Moreover, the insulation resistance value depends on the type of fault and its severity. The variations of insulation resistance with considering the mentioned parameters are evaluated in this paper, to study the possible correlation between IR/PI and changes in other parameters. It was found that with taking the effective parameters into account, the accurate and reliable insulation test interpretation can be achieved in HV electrical machines. A comprehensive review of literature was done and industry experts were surveyed for their ideas and experience under a research project. The main results are summarized in this paper.

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Condition-based maintenance of high-voltage machines-a practical application to electrical insulation

Cited by 14 publications

References 24 publications

A review on insulation challenges towards electrification of aircraft

A review on insulation challenges towards electrification of aircraft

Pre-breakdown arcing and electrostatic discharge in dielectrics under high DC electric field stress

Influence of ambient and test conditions on insulation resistance/polarization index in hv electrical machines - a survey

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