CINRAD/SC天气雷达发射系统反峰过流故障与排除

概述CINRAD/SC新一代天气雷达发射系统调制器的组成和工作原理,以新一代天气雷达一次＂反峰过流＂故障为例,根据故障检查方法和排除故障的全过程,对故障产生原因进行分析。结果表明：＂反峰过流＂故障主要原因为发射系统的脉冲变压器次级匝间短路,造成调制器失配,反峰电流激增,烧毁保护电阻,引起电流继电器动作,形成＂反峰电流保护＂并切断高压,输出＂反峰过流＂故障。更换脉冲变压器铁芯及绕组,注入新的25号变压器油,开机测试,各项技术指标均正常,故障排除,保障了雷达系统的正常运行。

Trouble and incident removal of inverse peak current overflowing of CINRAD/SC weather radar transmitting system

The constituents and primary working principles of the modulator in transmitting system of the CINRAD/SC new generation weather radar were introduced.The inspection method of trouble and troubleshooting process were described by using an incident of ＂inverse peak current overflowing＂ as a case study,and its reason was analyzed.The results indicate that the main reason of this trouble is pulse transformer turn-to-turn short circuit of transmitting system,which leads to mismatch the modulator,and then inverse peak current overflowing increases rapidly.Thus protection resistance is damaged and makes the current relay working,which comes into being ＂inverse peak current protection＂ and high voltage is cut off,finally it results in the trouble of ＂inverse peak current overflowing＂.Replacing the pulse transformer iron core and winding,injecting new No.25 transformer oil,various technical indicators are normal after booting test.The troubleshooting method ensures the normal operation of radar system.