Electrical relay protection control system and control method for compressor motor

The invention discloses an electrical relay protection control system and control method for a compressor motor, and belongs to the technical field of electrical relay protection. Comprising a main starting loop, a frequency converter protection device, a plurality of front-end motors, starting loops corresponding to the plurality of front-end motors, front-end differential protection devices corresponding to the plurality of front-end motors, front-end operation loops corresponding to the plurality of front-end motors, a tail-end motor, a tail-end motor operation loop and a tail-end frequency conversion differential protection device. And the main starting loop is connected with the tail end motor operation loop through a cable. The front-end motors are connected with the main starting loop through the starting loops, and the front-end operation loops of the front-end motors are provided with the front-end differential protection devices so as to protect power frequency stable operation of the front-end moto