Research On New Ntertripping Device Of Shangrao Power Supply Company

South is rich in hydropower resources, rapid development of photovoltaic industry, a large number of small power supply access to the nearest 110 kv substation, in order to improve the success rate of the action of high voltage into the line for the cast, domestic widely used in electric power system or main power supply failure occurs by the small power supply side installed low cycle load shedding device to remove the small power, but due to the small power boot capacity such as incomplete uncertain and automatic device, it may cause failure after reclosing is not successful, or have no movement since the shots, seriously affecting the safe and reliable operation of power system.In this paper, aiming at small power supply area for traditional since the existing shortcomings are analyzed, studied the fault characteristic quantity containing small power supply area, prepare the way for working principle on the basis of, on the basis of current mutation quantity, zero sequence voltage and negative sequence voltage, low voltage of fault characteristic, put forward the criterion for cutting device, multiplexing multiple criterion, try to avoid the shortcoming of each criterion, give full play to its advantages, complement each other. Accordingly the new cutting device design and type selection, combines the actual conditions of jiangxi shangrao company, this paper proposes a new suitable for small power supply area in the cutting device of the solutions and measures.New league cutting device is suitable for small power grid of substation, it can detect the grid parameters such as voltage, current, the switch quantity, greatly improving the device fault diagnosis ability, realize power system or main power failure occurs, make a comprehensive judgment, the first removal of small power side line switch, to ensure reclosing or prepare the correct action, is conducive to the safe and stable operation of power system.