Beijing Quartet CSC-285 digital capacitor protection and monitoring device functions: 1) speed off, over-current, inverse time protection. Configuring reflect the phase fault current protection, overcurrent protection and inverse time period of protection. 2) unbalanced current, voltage unbalance protection. Unbalance element is used to protect the capacitor internal fault. 3) Low voltage protection. Apparatus can automatically determine whether the removal of the load when the system voltage is too low, in order to achieve low-voltage control. 4) over-voltage protection. Apparatus can automatically determine whether the removal of the load when the system voltage is too high to protect the capacitive element. 5) non-power protection. It means the body is able to receive from the transformer to the non-power, can have up to four, non-power protection can decide according to the control word trip or alarm. 6) Small current grounding line function. Means having a small current grounding line device, with the monitor master station together constitute a centralized small current grounding line system can also be independently selected from the line, with the jump line selection function. 7) non-power protection. Means the body is able to receive from the capacitor to the non-power, can have up to four-way, two-way trip, two alarms. 8) FC lockout. FC lockout means having to work with an external fuse. 9) monitoring and control functions (optional). a) Ua, Ub, Uc, Ia, Ib, Ic, Uab, Ubc, Uca, P, Q, f and other simulation amount of telemetry; b) 15 Road to open into the remote signal acquisition; c) a variety of events, SOE, Disturbance; d) normal breaker remote control division. 10) Other functional descriptions. PT disconnection device having an alarm control mother and spring break warning alarm feature is not charged.