Beijing Quartet CSC-241G Digital Factory (the) transformer protection and monitoring device features: 1) differential protection. Device equipped with differential speed off the protection element and the ratio of differential protection element, the ratio of the differential operating characteristic properties of a conventional three-fold, namely to ensure that the external faults not malfunction, but also ensure the removal of internal faults sensitivity, differential protection phase action. Criteria for the use of second harmonic inrush current principle or door braking. 2) overcurrent protection. Device equipped with current quick break and overcurrent protection components. 3) Overload protection. 4) Overload element device operable to trip or alarm. Current acceleration protection. Manual or automatic input transformer to the fault, the fault current to accelerate the removal of protective action. 5) Zero-sequence current protection. Means for detecting a neutral point of the transformer CT or high, the low-pressure side of the zero-sequence current. High side zero sequence current protection using definite time mode, the low pressure side of the zero-sequence current can be definite time or inverse time mode as necessary. 6) Low voltage protection. Apparatus can automatically determine whether the load shedding system voltage is low, in order to achieve low-voltage control. 7) The zero-sequence voltage protection. Zero sequence voltage monitoring external zero-sequence voltage element size, motion and alarm. 8) 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. 9) Other functional descriptions. Disconnection detection device has a CT, PT disconnection detection, control mother break alarm, poor flow limit alarm and spring, not energy storage alarm function.