in the at500z intelligent unlocking system, the intelligent unlocking software and an intelligent unlocking key work together. under the circumstance of abnormality of the error-proof device, equipment polling and maintenance, or cooperation for maintenance, the system can realize controlled management of unlocking objects or range, forbid the error-proof locks beyond the operation authorizations and eliminate the potential safety hazard that people can unlock at will due to the existence of universal unlocking key, further improving the unlocking management of substation error-proof devices.