Study On The Strategies Of10kV Automatic Switchings In Different Operation Mode

Along with growing of Zhongshan power grid and the economy, the load of transformersubstation is heavier. According to the Scheduling rules of Zhongshan power supply bureau,when the transformer overload1.5times, the10kV Automatic Switchings will be out ofservice, and the risk of the10kV bus losing voltage will increase. In addition, the substationsof three transformers operating are more and more, the load would not distribute equably after10kV–Automatic-Switching acted, and it would make some transformers overload, and thenimpact the device of the substations operating safely. With respect to this current situation, thethesis study on the Strategies of10kV Automatic Switchings in Different Operation Mode, inorder to solve specific questions below:1) It may cause the transformers overload after10kV-Automatic-Switching acted in theoverload substations;2)When three step-down transformers supply4buses operating parsely, one transformeroffer two buses load, two10kV-Automatic-Switching operating independently,#2transformerwill overload seriously after two10kV-Automatic-Switchings act;3)Because of special mode of connection, the10kV-Automatic-Switching unable toreserve to supply two buses, and that will cause one of the buses no-voltage;4) The status of10kV-Automatic-Switching artificial judge by dispatchers on the basis ofgrid tide, and to put into or exit by maintenance personnels. Unable to realize putting into orout real-timly.The text research strategy adopt a10kV-Automatic-Switching to replace two10kV-Automatic-Switchings, and implement all of the functions, such as reserving betweentwo buses and spliting load. In the meantime, it accomplish league cutting load. At the sametime, it brings the following benefits.1) Overload league cutting function is achieved in the10kV-Automatic-Switching, thatsimplify the contour of transformers. If the load of#2transformer take sample by two10kV-Automatic-Switchings, it can not judge the overload exactly. It can be solved by one10kV-Automatic-Switching. 2) It saves construction investment and operation and maintenance cost by means ofreducing equipment and signal cables, so it is worthy to be popularized.3) Through the automatic judgment for putting into or stop, it reduce the risk of manualoperation, And timely way need to cooperate, suitable for power grid development trend.