大型直流传动系统数字化改造及典型故障案例
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摘要
某热轧厂粗轧R1上、下辊主电动机均为直流电动机,采用直流模拟调速装置。由于长期运行后模拟控制系统的零漂增大,以及可控硅性能的劣化,R1粗轧机电气传动系统故障频发。于2015年对R1粗轧机电气传动系统进行了数字化改造,直流电动机、电枢整流变压器及励磁整流变压器利旧,对电枢整流器、励磁整流器及控制系统进行了更新,采用西门子6RA80数字直流调速装置,并采用西门子SIMOTION D455控制器,完成直流电动机本体及辅助回路的控制。并结合一典型故障案例介绍了大容量直流传动系统的故障原因分析、处理方法及经验教训。
Both the top and bottom motors of R1 rough mill are DC motors,using the analog control system in a hot mill.Because of the zero drift of analog control system and the degradation of thyristors,R1 mill are often malfunction.The driving system is upgraded in 2015.The DC motors and all power transformers are still in use.Both the rectifiers of the armature and the excitation are upgraded.The Siemens 6 RA80 DC-MASTER and D445 controller were adopted to realize the control of the DC motor body and the auxiliary circuit.The compositions of the new driving system are introduced.The emphasis is on introducing the characteristics and functions of the new driving system.At last,the solving procedure of a typical fault cases is introduced,and the emphasis is on analysing the cause of failure.
Both the top and bottom motors of R1 rough mill are DC motors,using the analog control system in a hot mill.Because of the zero drift of analog control system and the degradation of thyristors,R1 mill are often malfunction.The driving system is upgraded in 2015.The DC motors and all power transformers are still in use.Both the rectifiers of the armature and the excitation are upgraded.The Siemens 6 RA80 DC-MASTER and D445 controller were adopted to realize the control of the DC motor body and the auxiliary circuit.The compositions of the new driving system are introduced.The emphasis is on introducing the characteristics and functions of the new driving system.At last,the solving procedure of a typical fault cases is introduced,and the emphasis is on analysing the cause of failure.
引文
[1] 赵弘,李擎,李华德.负荷观测器在轧机扭振抑制中的应用[J].大电机技术,2006(2):29-31.