The application of OTA and OTV will improve the influence of TA saturation on main equipment protection.

The system study, manufacture of main equipment , development of valve control, station control, DC protection, installation and commissioning have all been undertaken by domestic organizations.

The main causes of the accidents were poor ventilation(22.5%), lack of personal protection equipment(19.8%), lack of safety education (19.8%), and lack of safety work practice(15.3%).