Seeking advice on motor protection setting

Ahah, let me give a brief introduction to this sea friend! For the protection setting of motors in operation, the main types include overcurrent protection, stall protection, overload protection, overheat protection, negative sequence current protection, zero sequence current protection, and low voltage protection. Typically, the overcurrent protection setting can be set at around 1.5 times the motor’s rated current, with the timing adjusted to avoid the motor’s startup period ； The stall protection is typically set at around 3 times the motor’s rated current, with a delay time of about 3 seconds ； Overload protection: the setting value is set at 1.2 times the motor’s rated current, and the operating time is approximately 1.2 times the auto-start time ； Overheat protection is set based on parameters such as the negative-sequence current heating coefficient, heating time constant, and heat dissipation time constant of the microcomputer-based comprehensive protection system ； Negative sequence current protection is usually deactivated during motor startup and activated after startup is complete (this is achieved through the built-in functions of the microcomputer-based protection system). The setting value is typically chosen to be no more than the motor’s rated current, while the delay time is set at around 1.5 seconds ； The low-voltage protection is typically set at 40% of the busbar’s rated voltage, and the delay time must be coordinated with the operating time of the feeders and sectionalizing automatic transfer devices; it is generally chosen to be around 0.05 to 0.75 seconds.