A shunt capacitor detection method based on intelligent substation

摘要

Focused on the problems that capacitor branches parameters cannot be calculated with unknown neutral point voltage, a shunt capacitor detection method based on intelligent substation is proposed in this paper. Using the information from intelligent substation, basic equation of shunt capacitor is firstly constructed in consideration of capacitor operating characteristics. Then, basic balance equation is solved with branch parameters rotated symmetry, and the largest change with initial capacitance group is figured out as a positive solution; Based on the calculation results shunt capacitor fault on-line monitoring method is accomplished not affected by the connection mode. Simulation results show that this method can alarm the fault phase capacitor correctly, not affected by the parameters initial deviation and external faults, and greatly improved the reliability of the shunt capacitors operation.