Turbine overspeed protection is one of the critical areas in turbine control, and electronic trip systems can come useful, especially when the rotation speed is at 10 000 rpm or more. The system was designed as an electronic overspeed trip that can be used on new turbines or could be retrofitted into an already installed system. The range of turbines covered is from small industrial to large power industry turbines.
The system measures the rotation frequency and compares it with an emergency setpoint. When a critical speed is reached, the system sends a digital signal to stop the turbine while taking into account its acceleration. That is, if there is acceleration, the recalculates and reduces setpoint so that the rpms don’t overshoot the critical value.
