Lifetime Assessment of Electrical Insulation

Feilat, E. A.

doi:10.5772/intechopen.72423

Cited by 17 publications

(9 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Next section presents an empirical ALT model that assumes a power law model for the lifetime, which is a generally accepted empirical model to approximate the relation between electric field and time-to-failure over a wide ranges of magnitudes [34]. This model is simple to implement and is particularly suited for polymer-based high voltage devices, as DEAs [35].…”

Section: Lifetime Assessment: Theorymentioning

confidence: 99%

The effects of static pre-stretching on the short and long-term reliability of dielectric elastomer actuators

Iannarelli

Niasar

Ross

2019

Smart Mater. Struct.

View full text Add to dashboard Cite

Pre-stretching membranes in dielectric elastomer actuator (DEA) systems is a widely known technique to improve the dielectric's breakdown strength and therefore enhance the overall device performance. The impact of this approach on the long-term reliability of DEAs is, however, still unknown. In the present work, it is investigated how the elastomer lifetime is affected by the mechanical pre-stretch. Silicone membrane samples with different pre-stretch ratios were prepared and the respective DC dielectric strengths were measured for both short and prolonged tests using methodologies inherited from high voltage assessment technology. It is shown that, despite an absolute beneficial increase of the dielectric strength for the tensioned membranes, pre-stretching has a detrimental effect on the system's useful life. In all the studied cases, the pre-stretched specimens showed a shorter expected lifetime compared to new, relaxed membranes. The results suggest a careful selection of the relative electric field to be applied to DEAs system for long and reliable lifetime.

show abstract

Section: Lifetime Assessment: Theorymentioning

confidence: 99%

The effects of static pre-stretching on the short and long-term reliability of dielectric elastomer actuators

Iannarelli

Niasar

Ross

2019

Smart Mater. Struct.

View full text Add to dashboard Cite

show abstract

“…We also assume that 𝑑 𝑡 evolves as a Markov chain, and its parameters are 𝛼 and 𝛽. Following the study in [32], the probability of an insulation breakdown under temperature stress follows a Weibull distribution. Precisely,…”

Section: Machine Overheatingmentioning

confidence: 99%

The Age of Incorrect Information: an Enabler of Semantics-Empowered Communication

Maatouk¹,

Assaad²,

Ephremides³

2020

Preprint

View full text Add to dashboard Cite

In this paper, we introduce the Age of Incorrect Information (AoII) as an enabler for semantics-empowered communication, a newly advocated communication paradigm centered around data's role and its usefulness to the communication's goal. First, we shed light on how the traditional communication paradigm, with its role-blind approach to data, is vulnerable to performance bottlenecks. Next, we highlight the shortcomings of several proposed performance measures destined to deal with the traditional communication paradigm's limitations, namely the Age of Information (AoI) and the error-based metrics. We also show how the AoII addresses these shortcomings and captures more meaningfully the purpose of data. Afterward, we consider the problem of minimizing the average AoII in a transmitter-receiver pair scenario where packets are sent over an unreliable channel subject to a transmission rate constraint. We prove that the optimal transmission strategy is a randomized threshold policy, and we propose a low complexity algorithm that finds both the optimal threshold and the randomization parameter. Furthermore, we provide a theoretical comparison between the AoII framework and the standard error-based metrics counterpart. Interestingly, we show that the AoII-optimal policy is also erroroptimal for the adopted information source model. At the same time, the converse is not necessarily true. Finally, we implement our proposed policy in various real-life applications, such as video streaming, and we showcase its performance advantages compared to both the error-optimal and the AoI-optimal policies.

show abstract

“…moisture, pressure, etc. ), are individually applied at greater level than that usually encountered in service conditions [12]. Then, the lifetime at normal operations is extrapolated from the data collected in abnormal circumstances, using a lifetime probability distribution (e.g.…”

Section: Considerations and Study Assessmentmentioning

confidence: 99%

“…For each collected time-to-failure , the Weibull CDF is estimated by the median rank estimator, according to the Benard's approximation (7) [12], where is the insulation breakdown and is the samples' population.…”

Section: = • − • (3)mentioning

confidence: 99%

See 1 more Smart Citation

Reliability Oriented Design of Low Voltage Electrical Machines Based On Accelerated Thermal Aging Tests

Giangrande

Madonna

Galea

2020

2020 International Symposium on Power Electronics, Electrical Drives, Automation and Motion (SPEEDAM)

View full text Add to dashboard Cite

In transport applications, electrical machines are required to be highly reliable, in order to fulfill the intended mission profile over the expected lifetime. This task has been conventionally addressed through the adoption of safety-factors that might lead to an over-engineered electrical machine. Only recently, few works have started championing a paradigm shift towards physics of failure methodologies, which allow to achieve an appropriate trade-off between optimal performance and demanded reliability figures. Thus, this paper proposes a reliability-oriented approach for low-voltage electrical machines and outlines its critical implementation steps. Accelerated thermal aging tests are preliminarily performed on custom-built specimens to assess the aging trend of the turn-to-turn insulation system. The thermal endurance graph at several percentile values is then determined and a lifetime model suitable for variable duty motors is developed. Finally, this model is used to predict the turn-to-turn insulation cycles-to-failure of an electrical machine installed on full-electric vehicle.

show abstract

Lifetime Assessment of Electrical Insulation

Cited by 17 publications

References 36 publications

The effects of static pre-stretching on the short and long-term reliability of dielectric elastomer actuators

The effects of static pre-stretching on the short and long-term reliability of dielectric elastomer actuators

The Age of Incorrect Information: an Enabler of Semantics-Empowered Communication

Reliability Oriented Design of Low Voltage Electrical Machines Based On Accelerated Thermal Aging Tests

Contact Info

Product

Resources

About