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为适应大功率门极关断晶闸管 ( GTO)不断增长的实验要求 ,建立了较大容量 ( 4 0 MVA/ 5 k V/ 8k A)的实验电路和快响应的测试设备 ,给出了选取电压和电流传感器的一般原则 ,并详细分析了影响 GTO开关波形的各种因素。基于所建实验系统 ,通过改变主电路和吸收电路的参数配置 ,系统研究了不同工况下 GTO的动态损耗特性。通过分析提出了开通和关断损耗的改进计算方法 ,在获得较高准确度( 95 % )的同时可降低对示波器测量分辨率的要求。实验方法和结果为 GTO的动态开关特性研究和应用系统设计提供了参考依据。
In order to meet the growing requirement of GTO, a large capacity (40 MVA / 5 k V / 8 k A) experimental circuit and fast response test equipment are established. The selected voltage And the general principle of the current sensor, and a detailed analysis of the various factors that affect the GTO switching waveform. Based on the experimental system built, the dynamic loss characteristics of GTO under different operating conditions are studied systematically by changing the parameter configuration of the main circuit and the absorption circuit. Through the analysis, an improved calculation method of turn-on and turn-off loss is proposed, which can reduce the measurement resolution of the oscilloscope while obtaining high accuracy (95%). The experimental methods and results provide reference for the research of GTO dynamic switching characteristics and application system design.