Space charge measurement in LPDE films under temperature gradient and DC stress

Chen, X; Wang, X; Wu, Kai; Peng, Zongren; Cheng, Yujia; Tu, Demin

doi:10.1109/tdei.2010.5658231

Cited by 93 publications

(41 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The space charge characteristics of the original LDPE and the fluorinated samples were measured with pulsed electro acoustic (PEA) method detailed in Ref. 10. The anode was semi-conducting (SC) electrode produced by loading carbon black into LDPE and the cathode was aluminum (Al) electrode.…”

Section: Samples and Experimentsmentioning

confidence: 99%

Space charge characteristics of fluorinated polyethylene: Different effects of fluorine and oxygen

Zhao

Nie

2018

AIP Advances

View full text Add to dashboard Cite

Direct fluorination are proved having obvious effect on space charge characteristics of polyethylene. It is believed that fluorine has a positive effect on suppressing space charge injection while oxygen impurity has a negative effect. However, the mechanism for the opposite effect of fluorine and oxygen is still not clear. In this paper, the different effects of fluorine and oxygen on space charge characteristics of fluorinated low density polyethylene (LDPE) are investigated on the basis of dielectric property, chemical constitutes and trap performance of surface fluorinated layers. The results show that direct fluorination has obvious effect on chemical constitutes and dielectric properties of surface fluorinated layer. Introduced fluorine is the main factor for suppressing charge injection from the electrodes, because it seriously changes the chemical constitutes and further the trap properties of the surface fluorinated layer. While introduction of oxygen results in heterocharges and makes space charge distribution complex, due to the ionization of generated small groups like C=O containing groups. Moreover, direct fluorination will result in cleavage of some LDPE molecules whatever there is oxygen impurity or not.

show abstract

Section: Samples and Experimentsmentioning

confidence: 99%

Space charge characteristics of fluorinated polyethylene: Different effects of fluorine and oxygen

Zhao

Nie

2018

AIP Advances

View full text Add to dashboard Cite

show abstract

“…Here, q is the thermal flux. With the above parameters, the simulated temperature drop across the sample is ΔT = 1.3 K. (13,15) Here, the temperature drop at the Al electrode is ignored because of its high thermal conductivity. The thermal conductivities of XLPE, EPR, and the semiconductive layer are the same at 0.3 W/m•K.…”

Section: Finite Element Simulation Of Thermal Gradient In Sample Usinmentioning

confidence: 99%

“…If the thermal gradient is as large as ΔT = 20, 40, and 60 K, (13) the electric field on the side of the electrode warmed by a heater may decrease. However, there were no notable increase in electric conductivity and decrease in electric field on the warmed electrode side at ΔT = 1.2 K in this experiment.…”

Section: Heterocharge Accumulation In the Bulk And Positive Homochargmentioning

confidence: 99%

Space Charge Behavior under Thermal Gradient in Cross-linked Polyethylene and Ethylene-Propylene Rubber

2017

Sensors and Materials

View full text Add to dashboard Cite

The direct observation of space charge injection, transport, accumulation, and recombination in solid dielectrics, as well as their spatial evolution over time, is of considerable importance in the investigation of design stress and the aging mechanism of engineering dielectrics under a high electric field. In a high-voltage direct current (HVDC) power cable with an expected temperature gradient at operating temperature and electric field, the spatial variation of the ratio of two electromagnetic constitutive parameters of the cable dielectric, the permittivity vs conductivity, acquires the presence of space charge across the insulation. Such a space charge distribution depends strongly on the temperature and electric field coefficients of these electromagnetic constitutive parameters. In addition, the injection of charges across the conductor/ insulation interface and the subsequent transport, trapping and detrapping of these charges over various chemical and physical defects further enhance the electric field distortion and aging of cable dielectrics. Numerous studies have been conducted under a parallel-plate configuration to understand such a space charge effect. However, nearly all of them were conducted under uniform isothermal conditions. The ability to perform a space charge profiling study under a thermal gradient in the development phase of new extruded high-voltage direct current cable materials brings in the most value upstream. In this study, through model-aided design, a parallel-plate, pulsed-electroacoustic (PEA) space charge profiling technique is extended to include a thermal gradient in flat dielectric samples. The space charge behavior and dynamics within flat dielectric specimens in the presence of a thermal gradient have been studied extensively through a modified PEA system to provide insights into the high-field aging mechanisms of new materials developed for energy-efficient power devices and renewable integration.

show abstract

“…In previous work [11] a pulsed electroacoustic (PEA) measurement system suitable for temperature gradients and a related correction method were developed in order to simulate the real situation of high voltage cables. Fig.…”

Section: A Space Charge Distribution Of Single Layer Samplesmentioning

confidence: 99%

Study on suppression mechanism of space charge accumulation in nano-doped LDPE

Wang

et al. 2012

2012 Annual Report Conference on Electrical Insulation and Dielectric Phenomena

View full text Add to dashboard Cite

The introduction of nano-fillers into polyethylene can suppress space charge accumulation. The mechanism of this phenomenon hasn't been understood clearly, and has been explained in two different ways, i.e. an interface behavior that reduces charge injection and a bulk property that affects charge migration. In order to investigate which factor determines the space charge behavior in LDPE nano-composites, samples of triple-layer structure are measured. The experimental results show that the nano-fillers can reduce charge injection. However, the reduced charge injection cannot entirely remove the space charge. The bulk property also plays an important role in space charge suppression. Furthermore, a bipolar blocking phenomenon is found in our triple layer sample at high temperature. This can be explained by a shift in the apparent Fermi (charge demarcation) level near the electrode due to the trapping of injected charge, which increases the interface barrier.

show abstract

Space charge measurement in LPDE films under temperature gradient and DC stress

Cited by 93 publications

References 22 publications

Space charge characteristics of fluorinated polyethylene: Different effects of fluorine and oxygen

Space charge characteristics of fluorinated polyethylene: Different effects of fluorine and oxygen

Space Charge Behavior under Thermal Gradient in Cross-linked Polyethylene and Ethylene-Propylene Rubber

Study on suppression mechanism of space charge accumulation in nano-doped LDPE

Contact Info

Product

Resources

About