Development of wide area current differential protection IED based on IEC 61850

Nowadays power system structure are becoming more and more complex. Capacity exchanged are increasing day and day, and voltage level of the network are raised continually. Those brings new challenge on network security. Security and stability of network depends on correct and rapid action of relay protection devices. With developed communication network technology, current differential protection can be introduced into wide area network. Duplicated protection can be made up with it and traditional protection. On the other hand, it can be also a now backup protection scheme which has faster action speed than traditional one. Using hierarchical function structure, uniform object model and abstract communication service interface of IEC 61850 as reference, modeling of wide area current differential protection IED is given. The model insures interoperability between IEDs. Hardware of wide area current differential protection IED is designed in this paper too. Plug-in hardware module are designed to constitute IED. The mapping relationship between logical device and plug-in hardware module is also depicted.