Influence of Molecular Chain Side Group on the Electrical Properties of Silicone Rubber and Mechanism Analysis

Wei, Yanhui; Yang, Jingjing; Li, Guochang; Zhou, Xuguang; Hao, Chuncheng; Liu, Qingquan

doi:10.1109/tdei.2022.3175443

Cited by 8 publications

(7 citation statements)

References 19 publications

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“…The specific analysis is as follows: The TSDC curves of different materials can be studied to obtain the quantity of trapped space charge, as shown in Equation .

Q_{TSC} = \frac{60}{β} \int_{T 0}^{T 1} I (T) dT

where β is the heating rate, K/min; T 0 and T 1 are the starting temperature and ending temperature, respectively, K; I ( T ) is the current during the test, pA. The calculation results of the space charge quantity are shown in Figure 5 32 …”

Section: Experimental Results and Analysismentioning

confidence: 99%

“…The number of space charges inside the insulation specimen is closely related to the trap parameters. The trap energy level can be calculated by evaluating the experimentally measured TSDC curves 32 …”

Section: Experimental Results and Analysismentioning

confidence: 99%

“…The trap energy level can be calculated by evaluating the experimentally measured TSDC curves. 32 The relationship between the current and the trap energy level is shown in Equation (2).…”

Section: Space Charge and Trap Properties Analysismentioning

confidence: 99%

“…On the contrary, EPDM/PP and SEBS/PP composites are of the smallest spherulite, with a relatively large number of free electrons inside the system, and relatively low volume resistivity. 32…”

Section: Volume Resistivity Analysismentioning

confidence: 99%

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The influence and mechanism of elastomer types on electrical and mechanical properties of polypropylene insulation materials for high voltage cables

Li,

Chen,

Liu

et al. 2023

J of Applied Polymer Sci

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Polypropylene (PP) becomes a superior candidate material for new environmentally friendly cable main insulation with its excellent heat resistance, electrical properties, and degradability. However, in practical application, PP material is aging and vulnerable and its toughness is poor. The mechanical properties of PP material can be improved by elastomer modification, but the effects of different elastomers on the comprehensive properties of composite specimens are quite different. In this paper, the electrical and mechanical properties of different types of elastomer‐modified PP composites are compared and analyzed by combining experimental and molecular simulation (MS) methods. The experimental results show that the SEBS/PP composite material has the lowest trap energy levels among all kinds of composite materials, its space charge accumulation is 1.96 × 10−9C, and the mechanical and rheological properties improvement of the composite is the most remarkable. Meanwhile, the volume resistivity is reduced by two orders of magnitude compared with pure PP. However, the breakdown strength of all kinds of composite materials decreases by different degrees after the modification. The solubility parameters (δ) and the free volume are further investigated by the molecular simulation, which shows that the δ of SEBS is similar to that of PP, which represents the best compatibility. Moreover, the SEBS/PP composite material has the strongest inter‐molecular force and the most excellent toughness improvement for PP. This work provides a theoretical basis for elastomer selection in PP modification.

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“…The specific analysis is as follows: The TSDC curves of different materials can be studied to obtain the quantity of trapped space charge, as shown in Equation .

Q_{TSC} = \frac{60}{β} \int_{T 0}^{T 1} I (T) dT

Section: Experimental Results and Analysismentioning

confidence: 99%

Section: Experimental Results and Analysismentioning

confidence: 99%

“…The trap energy level can be calculated by evaluating the experimentally measured TSDC curves. 32 The relationship between the current and the trap energy level is shown in Equation (2).…”

Section: Space Charge and Trap Properties Analysismentioning

confidence: 99%

Section: Volume Resistivity Analysismentioning

confidence: 99%

See 2 more Smart Citations

The influence and mechanism of elastomer types on electrical and mechanical properties of polypropylene insulation materials for high voltage cables

Li,

Chen,

Liu

et al. 2023

J of Applied Polymer Sci

Self Cite

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show abstract

“…In this case, the electrical conductivity of EPDM increases with the increase in temperature, leading to an increase in the polarization current. According to the Oven theory of the thermally stimulated current [19], [20], the depth of the charge trap is deepened with the increase in temperature. Heat promotes the detrapping of charges in deeper traps during depolarization processes, resulting in an increase in the depolarization current.…”

Section: A Pdc Of Epdmmentioning

confidence: 99%

Dielectric Loss of EPDM Insulation Subjected to Thermal Stress and Pressure

Lei

Fabiani

et al. 2022

IEEE Access

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The insulation performance of ethylene propylene diene monomers (EPDMs) subjected to multi-stresses in the field is always obscure. To understand the effects of temperature and pressure on the performance of the EPDMs used as insulators for power cables, in this work, focuses were on the dielectric losses of EPDMs under the temperature range of 30-120°C and pressure range of 2-8 bar. The polarization and depolarization currents and the dielectric loss factor of EPDMs under the above conditions have been first measured. The relationship between the depolarization current and dielectric loss factor has been studied based on the correlation of the depolarization charge and the dielectric loss factor at low-frequency. The experimental results showed that the conduction currents and the dielectric loss factor increase with the increase in temperature, but the effect of pressure on the dielectric properties of EPDM is more complicated. There is a strong correlation between the depolarization charge and low-frequency dielectric loss factor, both of which can reflect the change law of the EPDMs' performance. Moreover, the asymmetry coefficient of the dielectric loss factor at low-frequency can be a supplement with regard to describing the deterioration degree of EPDM insulation. The evaluation chart of the insulation performance of the EPDMs has been advanced according to the asymmetry coefficient and the total dielectric loss calculated by the polarization and depolarization currents.

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Study on the field aging characteristics of composite insulators based on experiment and molecular dynamics simulation

Wang²,

Hao³

et al. 2023

Electr Eng

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Influence of Molecular Chain Side Group on the Electrical Properties of Silicone Rubber and Mechanism Analysis

Cited by 8 publications

References 19 publications

The influence and mechanism of elastomer types on electrical and mechanical properties of polypropylene insulation materials for high voltage cables

The influence and mechanism of elastomer types on electrical and mechanical properties of polypropylene insulation materials for high voltage cables

Dielectric Loss of EPDM Insulation Subjected to Thermal Stress and Pressure

Study on the field aging characteristics of composite insulators based on experiment and molecular dynamics simulation

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