An example of such new features can be found in the adoption of medium voltage protection relays for motor control in IEC 61850, in which it’s possible to use all the benefits of GOOSE messaging between IEDs without losing the interaction with process equipment, such as instrumentation, valves, and inverters.
A real case for this functionality can be given by a conveyor that handles ore, steel or any other goods.
In these cases, it is not uncommon for big medium voltage motors to be required for operation. In the event of failure, replacement is almost never immediate, causing damage and loss of production. Using features from the substation automation environment, like logic selectivity and interlocks, it’s possible to preserve equipment health.
The following figures show that, using IEC 61850, it is possible to switch off motors before over-current effects are detected by CTs, lowering the impact on the motors, thus increasing their life cycle. This reduces the likelihood of damaged windings or more serious problems that would demand replacement
or extended downtime.