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After a long in-service period, the electrical aging phenomenon of Nylon 6 may cause insulation degradation. Most of the researches focus on AC/DC or room temperature conditions. Less attention is paid to the nanosecond pulses conditions. In this paper, frequency effect on the electrical tree growth of nylon 6 was investigated. A solid-state pulse generator MPC50D was used to export nanosecond pulses...
Experiments were carried out to study the evolution of creepage discharge for various aged pressboards under ac constant voltages. White mark, impulsive current, UHF signal, acoustic signal and dissolved gases were measured. The results show that creepage discharge in aged pressboard tends to creep more quickly and easily than in unaged pressboard; average number of discharge experienced a rapid growth...
Intermetallic compounds (IMCs) that grow on the interface between the solder alloy and its bonding pads play a crucial role in the reliability of solder joints. It has been identified that the cracking around the IMC layer is the primary failure mode in lead-free solder joints. Therefore the mechanical behavior of the IMC has attracted great attentions. In this paper, mechanical properties of two...
The relationship between the space charge and the polymer residual life is studied both in domestic and abroad laboratories. An apparatus that can directly measure the space charge distribution in the polymer insulation materials is developed. Then the space charge distribution in the polymer insulation used in PWM inverter fed motors is tested. Effects of different test condition including pole voltage...
The final goal of the paper is to establish a transient moisture equilibrium model for estimating the moisture in paper of the running oil-immersed transformer. To this end, the presented model for oil-paper insulation is improved according to the insulation structure of oil-immersed transformer. The moisture diffusion process is divided into three steps, i.e., between paper and oil, between support...
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