Performance of Corona Resistant Insulation for Aerospace

Rumi, Alberto; Marinelli, J. G.; Seri, Paolo; Kohler, Mario; Cavallini, A.

doi:10.1109/eic49891.2021.9612358

Cited by 13 publications

(11 citation statements)

References 10 publications

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“…The CR and NCR wires share very similar values of endurance time within the voltage range explored, which are too short to guarantee operation in presence of PD activity. This result may come from the speculated shift of the electron energy distribution to higher values, with a single electron capable of breaking multiple bonds or capable of breaking chemical bonds previously inaccessible [35].…”

Section: Lifementioning

confidence: 99%

The Challenges of Reliable Dielectrics in Modern Aerospace Applications: The Hazard of Corona Resistant Materials

Rumi

Marinelli

Barater

et al. 2022

IEEE Trans. Transp. Electrific.

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The development of more electrical transportation systems requires rotating machines having higher efficiency and specific power. To date, this is achieved by feeding them with rising supply voltages with higher frequencies. This generalized strategy is introducing several challenges in the correct design of the insulation that is necessary for a reliable system. A major issue to be dealt with are partial discharges (PDs), an aging mechanism that can bring insulation to failure in short times. A solution often proposed by manufacturers involves the use of the so-called corona resistant (CR) materials, which supposedly can withstand PD activity. This article investigates the possibility of using CR magnet wires for electrical machines operating at reduced pressures, such as the actuators for primary control surfaces in more electric aircraft. The results show that CR insulations are characterized by an improved behavior at ground level but are not a viable option at reduced pressures.

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Section: Lifementioning

confidence: 99%

The Challenges of Reliable Dielectrics in Modern Aerospace Applications: The Hazard of Corona Resistant Materials

Rumi

Marinelli

Barater

et al. 2022

IEEE Trans. Transp. Electrific.

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“…Electrons gain more kinetic energy when traversing a longer CFLL, increasing the likelihood of exceeding the bond energies of insulation materials (typically 3-4 eV for Carbon-Carbon and Carbon-Hydrogen bonds). Excessive electron energy can cause erosion through DEA [34]. As a result, maximum damage occurs when both Vfiring and CFLL reach their peaks, as observed at 90°C and RH = 90% in Figs.…”

Section: G Firing Voltagementioning

confidence: 88%

Modeling Humidity Impact on PDIV for Turn-to-Turn Insulation of Inverter-Fed Motors at Different Temperatures

Naderiallaf,

Ji,

Giangrande

et al. 2024

IEEE Trans. Dielect. Electr. Insul.

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This paper models the partial discharge inception voltage (PDIV) as a function of ambient humidity (H) at various temperatures (Ts) using Schumann's streamer inception criterion (SCSIC) for turn-to-turn insulation, which is the most vulnerable part in inverter-fed motors' insulation system. The Schumann constant (i.e., the natural logarithm of the critical electron number defining the Townsend-tostreamer discharge transition, K) varies with H, showing distinct patterns at low and high Ts. The K equations are derived across a wide range of relative humidity (RH) levels (20%, 30%, 40%, 50%, 60%, 70%, 80%, and 90%) at four Ts (25°C, 40°C, 60°C, and 90°C). These equations can be used in finite element analysis software to predict PDIV under varying H with outstanding accuracy. Additionally, a novel approach is presented for partial discharge (PD) phenomenology under H variations at different Ts using SCSIC-derived streamer inception parameters (SIPs): critical field line length (CFLL), air effective ionization coefficient (𝜶 𝐞𝐟𝐟 ), partial discharge (PD) inception field (Einc) and firing voltage (Vfiring). Notably, at high Ts (e.g., 90°C), a transition phase emerges concerning RH, leading to significant SIP changes due to the disappearance of a critical region (CritR) in 𝜶 𝐞𝐟𝐟 at specific electric field intensities. The developed humidity-dependent PDIV model supports insulation designers in achieving PD-free designs that account for H variations and sheds light on SIPs variations concerning H changes.

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“…Due to the fast rise times and elevated voltage levels of transportation motors, for example, insulation systems require stronger withstand voltages; this refers both to enameled wire coatings and impregnation resins [47]. At high altitudes, an aircraft's operation results in exposure of electrical insulation (e.g., cabling, converters, motors, etc.)…”

Section: Insulation Systems Of Transportation Devicesmentioning

confidence: 99%

“…are also of great importance for achieving partial discharge-free and resistant insulation. Taking reduced dielectric withstand at low pressure in air into account, industrial and automotive e-drivemotor power trains need additional testing, and improvements for corona-resistant capabilities (especially with respect to the wiring and winding) should be implemented and executed [47].…”

Section: Insulation Systems Of Transportation Devicesmentioning

confidence: 99%

Effect of Magnetic Field on Partial Discharge Dynamics in Insulation Systems of Transportation Power Devices

Florkowski

2022

IEEE Trans. Transp. Electrific.

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The globally observed trend toward electrically supplied devices is common in the transportation segment. Traditionally, the performance of electrical insulation has been assessed with respect to electric stresses and endurance. In all current-carrying devices, magnetic fields will also be superimposed on electric ones; therefore, the influence of a magnetic field's exposure on partial discharge (PD) dynamics is an actual research topic. This problem is important in the T This article has been accepted for publication in IEEE Transactions on Transportation Electrification.

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Performance of Corona Resistant Insulation for Aerospace

Cited by 13 publications

References 10 publications

The Challenges of Reliable Dielectrics in Modern Aerospace Applications: The Hazard of Corona Resistant Materials

The Challenges of Reliable Dielectrics in Modern Aerospace Applications: The Hazard of Corona Resistant Materials

Modeling Humidity Impact on PDIV for Turn-to-Turn Insulation of Inverter-Fed Motors at Different Temperatures

Effect of Magnetic Field on Partial Discharge Dynamics in Insulation Systems of Transportation Power Devices

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