概述了双极功率晶体管二次击穿机理。
Second breakdown mechanisms of bipolar power transistor is summarized.
从绝缘油的击穿机理出发，分析了影响绝缘油击穿电压测定值准确度的主要因素，以及判断击穿电压测定值精密性和准确性的原则。
Based on the breakdown mechanism of insulating oil, main influential factors and judging principles on the accuracy of the test results are analyzed as well.
为研究轴承电流产生机理及存在形式，建立模拟轴承内部接触和轴承油层击穿的轴承模型。
A bearing model for investigating the mechanism and form of bearing current is proposed, which simulates the bearing interior contact and oil layer breakdown.
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