High speed switch automatic detection and protection device of direct current electric locomotive

The utility model discloses a high speed switch automatic detection and protection device of a direct current electric locomotive. The device belongs to mining direct current electric locomotive power supply equipment, and especially relates to a leakage or short-circuit protection device of an electric locomotive power supply main circuit. The device is characterized in that an iron frame is insulating against the ground; a high voltage sampling circuit is connected in series between the iron frame and the ground; and a detection protection circuit which is provided with a detection button and is composed of a sampling unit circuit, an execution unit circuit and a test detection unit circuit and a fault display circuit which is provided with a reset button are arranged on the sampling circuit. When a fault occurs, the sampling circuit generates signals; a signal drives a relay to act; a high speed switch is disconnected; the main circuit is protected; and the other signal lights up an LED lamp to give an ala