论文部分内容阅读
电子束轰击炉运行过程会产生高压放电现象,严重时可能损坏高压整流硅堆。通过深入分析,指出其成因是由于高压整流变压器漏感较大和系统采用大电感高压滤波,当高压放电时电子束流剧增,三相桥式整流电路运行于一种强迫延时换相角αp=30°和换相重叠角γ≥60°的故障状态,时间过长必然导致高压整流硅堆热损坏。为此提出3点改进措施:直流高压输出端设置扼流电抗器以抑制电子束流的上升速度;控制电路检测直流高压输出的下降突变信号,快速判断高压放电的发生;高压电源供电回路串接晶闸管,用于软起动及快速切断供电电源。实践证明:对高压整流硅堆损坏的原因分析是正确的,所采取的应对策略是有效的。
E-beam bombardment furnace operation will produce high-pressure discharge phenomenon, may seriously damage the high-voltage rectifier silicon reactor. Through in-depth analysis, it is pointed out that the reason is that the leakage inductance of the high-voltage rectifier transformer is large and the system uses the high-inductance high-voltage filter. When the high voltage discharges, the electron beam current increases sharply, and the three-phase bridge rectifier circuit operates at a forced delay commutation angle αp = 30 ° and commutation overlap angle γ ≥ 60 ° fault state, the time is too long will inevitably lead to high-voltage rectifier silicon heat damage. To this end, three improvements are proposed: a choke reactor is set at the DC high-voltage output to suppress the rising speed of the electron beam; the control circuit detects a sudden change signal of the DC high-voltage output to quickly determine the occurrence of high-voltage discharge; Thyristor for soft start and fast cut off the power supply. Practice has proved that: the reason of high-voltage rectifier silicon damage is correct, the countermeasures adopted are effective.