大功率GTO损耗特性的实验研究

Experimental investigation of power loss characteristics of large capacity GTOs

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。

To meet the increasing stringent test requirements for high power gate turn off thyristor(GTO), a large capacity circuit (40MVA/5kV/8kA) was built with fast response instrumentation for GTO tests. A general rule was presented for selecting suitable voltage and current transducers with detailed analysis of the main factors affecting GTO switching waveforms. The parameter arrangements of the main circuit and the Snubber circuit were varied to provide a comprehensive investigation of GTO dynamic power loss characteristics. The improved loss calculation method can improve the accuracy of digital oscilloscopes with a measurement error of less than 5%. The test strategy and the results provide valuable information for both the dynamic switching behavior investigation and the system design of GTO.