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GZDW intelligent type all-digital program-control DC screen is a new generation of unattended power system that is developed according to "DL/T459-2000" Ordering Specifications of Electric Power Ministry and "JB/T5777-2000" General Specification and Safety Requirements for D.C Power Supply Equipment of the Power System and combined with years of developing and manufacturing experience of DC power system. The modules, adopting the most advanced edge resonance soft-switching technology, are hot-pluggable, and the isolation design is used between modules, there is a CPU inside the module, and all referred calibration and control of modules are done with 12-digit D/, which avoids parameter drift caused by temperature coefficient and mechanical coefficient inherent in a potentiometer. Furthermore, the built-in E2ROM of modules ensures that the operating parameters of modules are never lost. The monitoring system, designed of building block structure, has a central main monitoring unit, a DC monitoring unit and switching value monitoring unit, and if necessary, a battery patrol unit and an insulation detecting unit are also available, and each unit is connected with central main monitoring unit through RS485 interface. The modularization makes maintenance easy and fast, and the monitoring system also has an RS232 interface of "four-remote" interface standard, which can satisfy the requirements of unattended substations for power plant automation and power system automation.