What Prevents a Generator from Motorizing?

Generator motoring protection can be provided by limit switches or exhaust hood temperature detectors. If you need a large number of these devices, add a reverse power relay. Reverse power relays are common in diesel generators, where unburned fuel is both an explosion hazard and a fire hazard.

What can destroy a generator?

Overheating can be caused by a number of things, such as the generator being overloaded, a winding insulation breakdown due to a fault, or insufficient bearing oil lubrication. Overheating a generator decreases its operational life, and can outright destroy the generator if the problem isn't solved quickly enough.

How will you protect the alternator by motoring action?

Primary motoring protection is provided by reverse-power relays for all types of units. The relay is generally connected to trip the main generator breaker(s), the field breaker(s), and provides a trip signal to the prime mover.