Trap energy distribution in polymeric insulating materials through surface potential decay method

Han, Yongsen; Li, Shengtao; Min, Daomin

doi:10.1109/tdei.2017.006886

Cited by 34 publications

(18 citation statements)

References 35 publications

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“…After the 3 min polarization, the sample is transported under the Kelvin probe of the electrostatic voltmeter to measure the decay of the surface potential for 40 min. The trap energy level ( E t ) and trap density N ( E t ) are calculated from the SPD measurement (i.e., V − t characteristics) as follows :

E_{t} = italickT \ln ((), γt)

N ((), E_{t}) = \frac{ε_{0} ε_{r} t}{italickT f_{0} ((), E_{t}) L^{2} q} \frac{dV}{dt}

where k is the Boltzmann constant, 1.38 × 10 −23 J/K; T is the surrounding temperature; γ is the escape frequency of the trapped charge carriers, 4.17 × 10 13 s −1 ; ε 0 is the dielectric constant, 8.85 × 10 −12 F/m; t is the time; f 0 ( E t ) is 1; L is the thickness of the sample, 150 × 10 −6 m; q is the unit electron charge, 1.6 × 10 −19 C.…”

Section: Methodsmentioning

confidence: 99%

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Enhancement of Service Life and Electrical Insulation Properties of Polymeric Cables With the Optimum Content of Aromatic Voltage Stabilizer

Chen

Paramane

Liu

et al. 2020

Polymer Engineering & Sci

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This article presents the possibility of extending the service life of XLPE insulation based on high voltage cables by blending the optimum concentration of the aromatic voltage stabilizer. The insulation performance of XLPE is analyzed by adding the 0.5, 1, and 3 wt% of 3‐aminobenzoic acid voltage stabilizer. The investigated insulation properties include the DC step‐by‐step breakdown to estimate the life exponent, space charge, DC conductivity, surface potential decay, dielectric loss, and dielectric constant measurements. The results illustrate that the 1 wt% voltage stabilizer addition increases the life exponent from 10 up to 15, which is highly suitable for the high voltage cables. Moreover, it exhibits the negligible space charge accumulation and the least electrical field distortion inside the insulation bulk. It also exhibits the lower DC conductivity by one order of magnitude comparing to the pure XLPE. The highest bandgap value of 1 wt% addition further supports its better insulating properties. Furthermore, the dielectric measurements show that the XLPE with 1 wt% voltage stabilizer exhibits the least dielectric constant and dielectric loss. The differential scanning calorimetry and thermogravimetric analysis results show that the thermal properties are significantly improved after the voltage stabilizer addition. POLYM. ENG. SCI., 60:717–731, 2020. © 2020 Society of Plastics Engineers

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E_{t} = italickT \ln ((), γt)

N ((), E_{t}) = \frac{ε_{0} ε_{r} t}{italickT f_{0} ((), E_{t}) L^{2} q} \frac{dV}{dt}

Section: Methodsmentioning

confidence: 99%

“…After the 3 min polarization, the sample is transported under the Kelvin probe of the electrostatic voltmeter to measure the decay of the surface potential for 40 min. The trap energy level (E t ) and trap density N(E t ) are calculated from the SPD measurement (i.e., V − t characteristics) as follows [26]:…”

Section: Electrical Measurementsmentioning

confidence: 99%

Enhancement of Service Life and Electrical Insulation Properties of Polymeric Cables With the Optimum Content of Aromatic Voltage Stabilizer

Chen

Paramane

Liu

et al. 2020

Polymer Engineering & Sci

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“…Equation (5) implies that a deeper trap level has a higher potential barrier in hopping polarization behavior. Moreover, increasing the density of deep traps increases the possibility of trapping during carrier migration, enhances trap trapping effects and reduces the mean free path of carriers [29]. Thus, more energy will be required for hopping polarization with the growth of the deep traps density.…”

Section: Thermal Ion Polarization Behavioursmentioning

confidence: 99%

“…Previous works [29] showed that the increase in the energy level and density of deep traps will have an excellent effect on the breakdown performance of electrical insulating dielectrics. Hence, the effect of deep traps on the breakdown strength of samples will be studied in conjunction with molecular chain displacement in this section.…”

Section: Electrical Breakdown Model Of Coupling Molecular Chain Displmentioning

confidence: 99%

Coupling Effect of Molecular Chain Displacement and Carrier Trap Characteristics on DC Breakdown of HDPE/LDPE Blend Insulation

Fan

Zhong

2020

Polymers

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This work focuses on the coupling effect of molecular chain displacement and trap characteristics on direct current (DC) breakdown properties of high density/low density polyethylene (HDPE/LDPE) blend insulation. Frequency domain spectroscopy (FDS) and isothermal discharge current (IDC) are used to characterize the dielectric relaxation and trap characteristics of HDPE/LDPE blends. A DC breakdown model is proposed to reveal the mechanisms of the molecular chain displacement and carrier trap on the DC breakdown strength. The dielectric relaxation α and δ present segmental motions and thermal ion polarization behaviours of HDPE/LDPE blends, respectively. α dielectric relaxation strength (Δεα) increases as the amount of HDPE increases from 0 to 5 wt%, and then declines with a further increase of HDPE content to 20 wt%. According to the velocity equation, the increase of Δεα will increase the molecular chain displacement, resulting in a larger free volume, which will provide electrons with larger free path λ to form hot electrons. A positive correlation exists between the activation energy of the dielectric relaxation process δ and trap density, and the increase of δ dielectric relaxation strength (Δεδ) will adversely affect the breakdown strength of the specimen. HDPE/LDPE blends with 15 wt% HDPE content have lower Δεα and lowest Δεδ, which decreases the mean free path λ of molecular chain and thermal ion polarization. At the same time, it has the highest deep trap density, thus increasing the probability of hot electrons being captured and improving the DC breakdown strength. It is concluded the breakdown of the dielectric is synergistically affected by the molecular chain displacement and carrier trap.

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“…In this section, we will study lifetime improvement and its mechanism under repetitive impulse voltages, by considering the influence of trap energy distribution on carrier transportation and charge dissipation with voltage reversion. Thus, isothermal surface potential decay (ISPD) [29,30] technique was conducted to study the charge transport characteristics of PI films before and after surface modification, revealing the energy distribution of both electron-type and holetype traps [31].…”

Section: Surface Modification Of Polyimide Filmsmentioning

confidence: 99%

Failure Mechanism and Property Modification of Insulation Material Used in Inverter-Fed Motors

Yang¹,

Wu²

2020

Modern Applications of Electrostatics and Dielectrics

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The insulation system of inverter-fed motors is subjected to repetitive impulse voltages, which are generated by pulse width modulation (PWM) converters, and is expected to withstand partial discharge (PD) activity during service. PD-induced dielectric breakdown becomes one of the most important reasons for premature failures of motor insulation. Therefore, the dielectric properties of insulation material used in inverter-fed motors need to be improved to meet the requirement for rapid development of applications. Many approaches have been proposed to improve dielectric properties of insulation material used in inverter-fed motors. In this chapter, we will discuss the failure mechanism, modification approaches, and their effects on dielectric properties of insulation material of inverter-fed motors.

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Trap energy distribution in polymeric insulating materials through surface potential decay method

Cited by 34 publications

References 35 publications

Enhancement of Service Life and Electrical Insulation Properties of Polymeric Cables With the Optimum Content of Aromatic Voltage Stabilizer

Enhancement of Service Life and Electrical Insulation Properties of Polymeric Cables With the Optimum Content of Aromatic Voltage Stabilizer

Coupling Effect of Molecular Chain Displacement and Carrier Trap Characteristics on DC Breakdown of HDPE/LDPE Blend Insulation

Failure Mechanism and Property Modification of Insulation Material Used in Inverter-Fed Motors

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