We have a 415V DG Set for emergency shutdown of a thermal power plant.
The DG neutral was kept unearthed as per consultant specification for maximum availability. The load is mainly motors and battery charger and UPS. When we run the DG with neutral ungrounded, the phase to earth voltages are heavily unbalanced. And it is changing during the course of running also.
What could be happening?
The DG neutral was kept unearthed as per consultant specification for maximum availability. The load is mainly motors and battery charger and UPS. When we run the DG with neutral ungrounded, the phase to earth voltages are heavily unbalanced. And it is changing during the course of running also.
What could be happening?