Diesel-electric locomotive ground relays

THE GROUND RELAY as used on a diesel-electric locomotive provides a number of important protective features. It was originally applied to furnish flashover protection, but has become useful in connection with other functions so that it now provides protection on a diesel-electric locomotive for: 1. Armature grounds in either the main generator or traction motors. 2. Accidental power circuit grounds. 3. High-resistance creepage grounds, such as those caused by moisture and dirt. 4. Flashover protection for the generator, motors, and contactors. 5. Ground protection during dynamic braking. 6. Ground protection during engine starting.