Multi-object capability is the next step in the development that changes the way of designing protection and control systems for transmission applications. The 670 series protection and control IEDs are powerful enough to handle several objects with a single IED and to enable many other smart solutions based on functional integration. Multi-object capability has already been utilized by several utilities to increase availability and to optimize cost-performance ratio while maintaining high grid reliability.
From the grid reliability point of view utilizing multi-object capability does not require any compromises either in security or dependability. This capability also provides new interesting ways of designing fully redundant protection and control systems. The availability will increase and cost savings can be achieved during the life cycle of the protection system.
Example: Protection of generating stations
In a single powerful generator protection REG670, it is possible to integrate differential protection for both the generator and the step-up transformer as well as for the auxiliary power transformer together with all other functionality normally required. In this case,
multi-object capability provides a new way to optimize cost-performance ratio of the protection system in relation to the importance of the generating station. This can be done by accommodating the needed functionality in an appropriate number of IEDs to ensure both dependability and security of the system.
Supported by IEC 61850
One important enabler for multi-object capability in addition to powerful hardware and software platforms is the IEC 61850 standard for substation automation. By defining functions as logical nodes with clearly defined output data, the standard provides more freedom and flexibility for allocating the functions needed in protecting the power system objects.