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Consider a medium voltage distribution system having local generation (e.g., captive power generation) as shown in fig 3.2 which is also synchronized with the grid. During grid disturbance, if plant generators are not successfully isolated from the grid, they also sink with the grid, resulting in significant loss in production and damage to process equipments. The following relays are used to detect such disturbances, its severity and isolate the inplant system from the grid. |
