PS640UX series protection, measurement, & control device is integrated protection,measurement, and control device developed by Guodian Nanjing Automation Co. Ltd. It is applicable to substations and power plants of non-directly grounded system or small resistance grounded system at 110kV and lower voltage levels.PS640UX can be used to protect and control the power substation, and is be widely used to Automobile industry, Building materials industry,  Water conservancy industry, Traffic  Industry, Oil industry, Chemical industry,Coal Industry, Metallurgical Industry and so on.

Main protection functions: