Real-time Monitoring Of The Short-circuit Current Software Development And Its Application

Due to the increasing requirement for the electric power, the installed capacity of generators raises abruptly as well as the ratio of the bulk unit and the amount of auto-transfers used in the power system. Consequently, in some area short-circuit current level is approaching to or have already exceed the breakers' abrupt capacity. However, the higher-rate voltage girder has not yet widely been used.The excess of the short-circuit current is one of the hidden troubles of the power system safe operation. At present, considering the circumstance that short-circuit current limiters and the higher-rate voltage breakers have not yet advanced, the most efficient means to control the short-circuit current is changing the structure of the power network. Nevertheless, the frequent switch operation results in the alternation of the topology in the power system, which might render the excess of the short-circuit current in some breakers. Given the mentioned above, it is necessary to monitor the condition of the breakers in the power system and check it by the standard of interrupting capacity of the breakers.The auto-check of short-circuit current application, which has operated for nearly one year in the ZheJiang electric pool and has been authenticated in Feb. 2006, was developed under the collaboration of ZheJiang University power system automation research center and ZheJiang electric power company dispatching and communication center. In this thesis, the fundamental developing process of this application is introduced laconically, and the importance is attached to the operation circumstances of this application in ZheJiang Province electric network after its implement.