Beijing Quartet CSC-231 Digital Reactor Protection and Control device functions: 1) Instantaneous differential protection. Under severe fault conditions for generating rapid removal of reactors in the reactor zone. 2) the ratio of the differential protection. It means three-stage polyline ratio differential principle, reaction zone fault protection, the second harmonic restraint. 3) overcurrent protection. It means setting two definite time overcurrent protection, current and time of each segment can be independently set value setting. 4) Zero-sequence overcurrent protection. Means specifically set definite time residual overcurrent protection, may be soft cast back plate control. 5) Overload protection. Overload element device operable to trip or alarm. 6) loss of pressure protection. This element prevents the reactor after bus voltage recovery is under attack, this function by Tab atresia. 7) CT break detection and differential protection blocking function. After the CT secondary circuit disconnection, device emits a warning signal, and can choose not blocking or locking differential protection exports. 8) The difference between the current limit alarm function. Differential current limit alarm is not blocking differential protection, this function AC sampling circuit protective device monitoring function. 9) non-power protection. From the motor body to the non-power contacts connected to the switch means input terminals. After receiving the non-power signals, trip or not is determined by the soft platen. If not by means of electricity after the trip, perform event logging, and through a network interface or field bus will be uploaded to the background computer records.