|Table of Contents|

 The dielectric response characteristics of curing process in
Epoxy-Mica composite insulation
(PDF)

[ISSN:1007-449X/CN:23-1 408/TM]

Issue:
2014年06
Page:
22-28
Research Field:
Publishing date:

Info

Title:
 The dielectric response characteristics of curing process in
Epoxy-Mica composite insulation
Author(s):
 LIU Ji LI Xiu-jing WEI Xin-lao
State Key Laboratory Breeding Base of Dielectrics Engineering,Harbin University of
Science and Technology,Harbin 150080,China
Keywords:
 Epoxy-mica composite insulation dielectric dissipation factor curing dielectric response
PACS:
-
DOI:
-
Abstract:
 For studying the effects of epoxy-mica curing process on the quality of high-capacity generator
insulation,the frequency domain spectroscopy was used for wide frequency dielectric spectroscopy measurements
of the generator bars. The expressions related to the relationship of dielectric dissipation factor
with frequency and temperature were derived according to dielectric response theory,meanwhile,frequency
domain characteristics of dielectric parameters were investigated under the test conditions of different
curing temperature and duration. It is shown that the dielectric response characteristics of insulation
system fully cured in 170 ℃ are superior to that of incompletely cured insulation system in 150 ℃ and
160 ℃. Small molecules crosslink into macromolecules after cured,which greatly reduce the curable polar
molecules. Total loss is less than those with temperature of 150 ℃ and 160 ℃. In addition,there is a
significant convergence trend in the loss scatter plot for each frequency of completely cured samples. It is
concluded that,with increasing degree of curing,small molecules prone to orientated polarization gradually
reduce,and the dielectric loss thus decrease significantly with respect to the incompletely cured samples
in the same frequency. The dielectric properties of epoxy-mica composite insulation is greatly improved
after curing.

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Last Update: 2014-11-26