IS200VTCCH1C
IS200VTCCH1C
IS200VTCCH1C
switching of factory power supply);
Low voltage factory power supply system and 400VPC;
High voltage start/backup power supply system (shared by 2 machines);
Diesel generator set and security power supply (monitoring only);
Dc system and UPS system (monitoring only);
Automatic synchronous system;
Power plant quick cutting system.
Electrical main protection safety automatic device because of the requirements of DCS to achieve its function is still a certain degree of difficulty, and to increase considerable cost. In principle, DCS is not required to achieve its functions, still retain its device, but they should have an interface between DCS, conventional way to use a hard interface. The reserved protection automatic special devices are mainly as follows:
Change group protection device;
Automatic quasi-synchronous device (ASS);
Automatic voltage adjusting device (AVR);
Plant power quick cutting device;
Fault recording device.
The electrical systems of auxiliary systems outside the main plant, such as coal transport, water treatment, hydrogen production and electric dust removal, are not included in the DCS system for the time being.
DCS control level and technical requirements for electrical system
The whole process of automatic program control can be realized from boiler ignition to generator grid-connected initial load. (Of course, a limited number of breakpoints can be set after manual analysis and decision to intervene in the operation), or when the unit is shut down, DCS can safely shut down.
The requirements for unit self-start and stop control are:
When the unit starts normally, when the generator reaches the rated speed, DCS will be put into AVR. When the generator voltage reaches the rated value, DCS will be put into the same time device. The synchronization of generator and power grid is automatically realized by the synchronization device. In the synchronization process, AVR and DEH are controlled by DCS. When the synchronization conditions are met, closing instructions are sent to
