Relay protective device, construction machine, relay protection control method and apparatus

A relay protection control apparatus, comprising:

• a memory;
• and
• a processor coupled to the memory, the processor being configured to execute, based on instructions stored in the memory, the following steps applied to a relay protective apparatus:
• acquiring a voltage of an output connection point of a relay protection circuit;
• and
• controlling a pull-in coil and a release coil of the relay protection circuit to be powered alternately to make a contact of the relay protection circuit oscillate, if the voltage of the output connection point of the relay protection circuit is less than a first threshold and not less than a second threshold, wherein the first threshold is less than a standard working voltage of a bistable relay, the second threshold is a minimum allowable working voltage of the bistable relay, and
• the relay protective apparatus comprising:
• a power input connection point;
• a relay protection circuit, comprising a bistable relay and an output connection point, the bistable relay comprising a contact, a pull-in coil and a release coil, an input terminal of the contact, an input terminal of the pull-in coil and an input terminal of the release coil being connected to the power input connection point, an output terminal of the contact being connected to the output connection point;
• and
• a central controller, comprising a first port connected to the output connection point, a second port connected to an output terminal of the pull-in coil, and a third port connected to an output terminal of the release coil.

A non-transitory computer-readable storage medium on which a computer program is stored, which when executed by a processor implements the following steps applied to a relay protective apparatus:

• acquiring a voltage of an output connection point of a relay protection circuit;
• and
• controlling a pull-in coil and a release coil of the relay protection circuit to be powered alternately to make a contact of the relay protection circuit oscillate, if the voltage of the output connection point of the relay protection circuit is less than a first threshold and not less than a second threshold, wherein the first threshold is less than a standard working voltage of a bistable relay, the second threshold is a minimum allowable working voltage of the bistable relay, and
• the relay protective apparatus comprising:
• a power input connection point;
• a relay protection circuit, comprising a bistable relay and an output connection point, the bistable relay comprising a contact, a pull-in coil and a release coil, an input terminal of the contact, an input terminal of the pull-in coil and an input terminal of the release coil being connected to the power input connection point, an output terminal of the contact being connected to the output connection point;
• and
• a central controller, comprising a first port connected to the output connection point, a second port connected to an output terminal of the pull-in coil, and a third port connected to an output terminal of the release coil.