Technique study to improve radiographic-testing reliability basing on self-excitation of pulsed power system
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摘要: 强流直线感应加速器（LIA）主要应用于闪光照相试验，对其工作可靠性的要求很高。但LIA中包含了庞大的高电压脉冲功率系统，在充电及等待时期，存在发生自激的可能性，从而导致试验失败，并造成重大经济损失及严重影响。从对Marx等装置发生自激后进行立即监测控制的角度，提出了一种提高闪光照相试验可靠性的方法，并研制了可靠性高、适应各种高压放电装置的无源放电检测探头，采用大规模可编程集成电路作为系统中的逻辑处理单元，提高了系统集成度，降低了线路的复杂程度，降低了系统调试的难度，研制的监测控制器可方便地进行监测路数的扩充，适应多达几十路放电装置的检测与监控。功率系统装置自激后，自激监测控制系统响应速度快，最快可以达到100 ns级，且系统抗干扰能力强，满足在闪光试验环境工作的要求，达到了在一定程度上提高闪光照相试验可靠性的目的。Abstract: The high current linear induction accelerators (LIA) is mainly made for advanced radiography which is the most important test method in hydrokinetics study. The required reliability of the whole test system is very high. The pulsed power system of LIA is very huge and complex. It includes several different kinds of high voltage equipment. There are some possibilities of self-excitaion for the equipment when they are charging or waiting after charged. If self-excitaion happens and no measure is taken, radiographic test would be unsuccessful, and heavy economic loss and bad effect are ineluctable. A method of improving the reliability of advanced radiography is developed based on monitoring the self-excitation of pulsed power system. Passive detector with high reliability for high voltage pulse discharging is first developed based on a certain extent linear principle and several type of detectors are also developed for different discharging equipment. Programmable large scale integrated circuits (LSIs) are adopted to make up of the logic processor in the system to improve the system integration degree, to simplify the circuit and to reduce the debugging difficulty. The monitor and controller system can be easily extended to meet more lines monitor demand. The fast response of the system is about hundred nanoseconds. Its anti-jamming ability can fully meet the demand of the radiographic test environment condition and achieve the goal of improving the the reliability of advanced radiography.
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图 2 功率系统装置自激的判断
Figure 2. Judgement of self-excitation for equipment of pulsed power system
图 4 监控策略改变后的监控能力的提升示意
Figure 4. Improvement after control strategy and technique change
图 5 LIA脉冲功率系统中存在的两种典型的放电波形
Figure 5. Typical discharging waveforms in LIA pulsed power system
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