35kV Substation Relay Protection System Design And Application

Nowadays,with the precondition of continuous development of power system and the safe and stable operation of power grid,electric power has brought great driving force and benefit to the national economy and social development.However,the power system usually suffer from insulation damage,broken line,overload and so on due to natural and human factors in operation,which will lead to the abnormal operation of power grid.If it can not be effectively controlled in time,it will cause power system shock,power supply stability imbalance,even the power grid collapse,and lead to large power outages,causing serious consequences.In order to prevent accidents,modern intelligent substation electrical equipment install protection device to protect power system,the protection of power system is the technology and equipment that can remove faulty equipment automatic and eliminate the abnormal situation,which is of great significance for the maintenance of power system.The paper uses the real accident cases as the starting point,combined with the original data.Using the equipment connection mode(inner bridge connection and single busbar wiring)studied and compared in detail to determine a suitable connection scheme(35kV side,10 kV side bridge,single parent segment);and analyse the circuit using the two kinds of operation the way(maximum and minimum operation mode)to calculate short-circuit current,protection definite value of equipment and circuit,and have a setting calculation and checking;it research and analyze real accident reason to further enhance the understanding of relay protection in power system.The conclusion is that the arrangement and setting of the power system relay protection can be improved,and put forward her own views on the improvement of power system relay protection sensitivity,and further clarify how to ensure the safety and stability of power grid.