Effect of temperature gradient on space charge behavior in epoxy resin and its nanocomposites

The effect of temperature gradient on space charge behavior is necessary to investigate for HVDC insulation. In this paper, space charge distributions in neat epoxy resin (EP) and EP/SiO 2 nanocomposites (NC) were measured under different DC stresses and temperature gradients. We found that differen...

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Bibliographic Details
Published in:IEEE transactions on dielectrics and electrical insulation 2017-06, Vol.24 (3), p.1537-1546
Main Authors: Dong, Jinhua, Shao, Zhihui, Wang, Yang, Lv, Zepeng, Wang, Xia, Wu, Kai, Li, Wenpeng, Zhang, Chong
Format: Article
Language:English
Subjects:
Anodes
Charge distribution
Charge measurement
Charge transport
Computer simulation
epoxy resin
Epoxy resins
Fillers
HVDC
Insulation
Mathematical models
Nanocomposites
numerical simulation
Simulation
Space charge
Temperature distribution
Temperature effects
temperature gradient
Temperature gradients
Temperature measurement
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Summary:The effect of temperature gradient on space charge behavior is necessary to investigate for HVDC insulation. In this paper, space charge distributions in neat epoxy resin (EP) and EP/SiO 2 nanocomposites (NC) were measured under different DC stresses and temperature gradients. We found that different temperature conditions applied to the electrodes had a great impact on space charge distributions: Only homocharge accumulated near anode at isothermal conditions, on the contrast, at temperature gradient of 60 °C, negative charge injected from cathode (high temperature side) and accumulated in the bulk, heterocharge appeared near anode (low temperature side). Moreover, SiO 2 nano-fillers added to NC could suppress the space charge accumulation significantly, and the pattern of space charge distribution in NC at temperature gradient of 60 °C also shows differently from that of EP. Numerical simulation based on the bipolar charge transport model was employed to study the experimental results. It shows that under temperature gradient, charge extraction plays an important role in heterocharge accumulation near the low temperature side. Moreover, it indicates that unlike the apparently measured conductivity, the charge mobility of NC does not increase rapidly with temperature in the range from 20 °C to 80 °C.
ISSN:1070-9878
1558-4135
DOI:10.1109/TDEI.2017.006138