动态直流干扰下固态去耦合器的应用

Application Technology of Solid State Decoupler under Dynamic DC Interference

目前管道交流排流防护中经常使用隔离电压为-2 V/+2 V的固态去耦合器,但在动态直流干扰下,管道电位会严重负向偏移,有可能会导致固态去耦合器负向导通,引入直流杂散电流。研究发现:在动态干扰下,固态去耦合器中确实有负向导通电流,而且管道发生负向导通后,管道阴保电位不能满足要求,管道受到动态直流干扰。增大排流器负向导通阈值可以明显减小负向电流。

At present,solid state decoupling devices with an isolation voltage of-2 V/+2 V are often used in pipeline AC drainage protection.However,under dynamic DC interference,the pipeline potential will seriously shift in the negative direction,which may lead to negative conduction of the solid state decoupling device and introduce DC stray current.Research had found that under dynamic interference,there was indeed negative conduction current in the solid-state decoupling device,and after negative conduction occurred in the pipeline,the cathodic protection potential of the pipeline could not meet the requirements,and the pipeline was subject to dynamic DC interference.Increasing the negative conduction threshold of the current collector could significantly reduce the negative current.