Abstract
Epoxy resin of saturable reactor for UHVDC converter valves works in high temperature condition for a long term, and it also suffers from bipolar exponential decay pulse voltage erosion. In order to study the electro-thermal aging law of epoxy resin, under the condition of 4.5 kV voltage and temperature 110 centigrade degrees, the electro-thermal aging test of 50 Hz sinusoidal voltage, rising 1.2 μs with pulse width 12 μs and falling 24 μs with pulse width 74 μs is carried out. The results show that with the increase of aging time, the dielectric constant and dielectric loss tangent value of epoxy resin increase obviously in the 10-1~103 Hz frequency range, and the aging degree of pulse voltage is lower than that of sinusoidal voltage. Therefore, the margin of the design according to the sinusoidal voltage aging is higher than that according to the bipolar pulse voltage under normal operating conditions.
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