微机控制同步电动机失步保护装置的研讨

Investigation of Technique and Equipment for Desynchroning Protection of Cynchromotor with Microcomputer Control

分析了同步电动机产生失步的原因，研制了微机控制的同步电动机失步保护装置。其原理以转子励磁回路中出现交变电流为依据，设置起动闭锁环节和同步振荡记忆闭锁环节，当同步电动机发生同步振荡时，失步保护装置能迅速识别，并进行记忆闭锁；当失步运行时，失步保护装置能做出灵敏、迅速可靠的动作。

Taking an investigation aim at the desynchronizing failure during the operationof the synchromotors due to external causco、the origin of the desynchronizing with excitationas well as without excition is analysed.The technique and equipment developed for micro-computer controlled decynchronizing protection of cynchronous motors possesses fine selec-tivity,sensibility,mobility,and reliability.Its operation principle is as follows:the occurenceof oscillatory current in the excitation circuit of the rotor will be taken as a criterion for set-ting up blocking lind of start and memory blocking link of synchronous oscillation.The oc-curence of synchronous oscillation in the synchromotor should be identified immediately bythe protection equipment and the memory blocking should be implemented.When the motoroperates in desynchronous regime,the equipment of desynchronous protection should act sen-sitively,quickly,and reliably.