Analysis Of Current Into The Ground Of Converter Station Ground Pole Impact Electrical Equipment

The implementation of the state will soon send South West Inner Mongolia region in Central China coal base energy demands in economically developed areas, the State Grid Corporation intends to persons in the territory of Ordos City, the new 800 k V converter station in West Inner Mongolia region, and converter station supporting the grounding electrode planning land of about 1 km2.In Inner Mongolia west converter station grounding of the planned position, grounding electrode and a plurality of the adjacent 500 k V double circuit AC line and the corresponding substations. Power transformers and current transformers as the main power system energy transmission device, the operating status will directly affect the safety and stable operation of the entire power system.AC-DC interaction generated DC bias effect will make the power system transformer and current transformer core saturation, resulting in a large number of harmonics, affect the safe and stable operation of the grid. Aiming DC bias characteristics of research on the current transformer.(1) Mengxi preselected for the current converter station site and Dalateqi quasi flag pole pole site for grounding into the earth-current DC current in the vicinity of the AC transformer windings were calculated and evaluated.(2) DC bias established by PSCAD simulation software simulation model of the three-phase group type transformer DC bias calculated under no-load operating conditions, and to analyze the characteristics of the current transformer in the DC bias magnetic excitation, the article concludes feasible measures to suppress the DC bias.