Research On Solution For DC System To Prevent AC Intrusion

The substation DC system plays an important role in the substation auxiliary equipment.But due to the particularity of substation DC system in substation is more vulnerable to lightning wave invasion than other occasions,AC DC ground penetration,interference,the interference may not only damage the two equipment,may also cause the circuit breaker misoperation a serious accident.The existing DC system of substation by the lightning arrester,DC insulation monitoring device,solves the lightning wave invasion and DC grounding problem,but for the solution of the AC invasion effectively.Based on the DC system and preventing the exchange of invasive research on science and technology scheme project,through the project as responsible for research participants experience,the research methods and ideas were to study design and overall.Firstly analyzes the operation status of the DC system insulation of DC power grid and the existing central supervision problems and deficiencies,the domestic anti intrusion AC DC system technology analysis,put forward the necessity and feasibility to carry out anti AC invasion Scheme Research of DC system.Then the anti invasion scheme of AC DC system target as the base,and put forward the technical scheme for preventing the exchange of intrusion,formulated the technical idea of a new type of insulation monitoring device design,detailed design,new type insulation monitoring device DC system technical requirements,functional requirements,design ideas,the main technical indicators,design principle and design scheme of the AC invasion.The characteristics of DC are studied emphatically.Finally,the application of the new insulation monitoring device is discussed.