This book comprehensively implements condition maintenance of power grid transmission and transformation equipment, which is a key production task established by Inner Mongolia Electric Power Company during the "Twelfth Five-Year Plan" period, and is a major change in the company's production management methods. The establishment of a standardized production management system is of great significance to realize the intensive, refined and standardized management of Inner Mongolia power grid production and improve the asset management level of Inner Mongolia power grid. This management manual is based on the functions of the Inner Mongolia Electric Power Company's production management information system (MIS system for short) and focuses on the overall idea of condition maintenance work. It provides comprehensive and detailed system operation instructions and power transmission and transformation equipment ledger entry specifications for the relevant parts of the production MIS system in an end-user-oriented manner to meet the needs of relevant users of each power supply unit to correctly use the production MIS system. This management manual includes two parts: production management information system operation instructions and power transmission and transformation primary equipment ledger entry specifications. The operation instructions of the production management information system include four parts: basic information part, entry of basic equipment information, equipment status maintenance and online monitoring. The basic information part includes three chapters: system configuration requirements, basic function description, and permission configuration. The entry of basic equipment information involves the entry of primary equipment ledger, the entry of auxiliary equipment ledger, the entry of equipment defect records, the entry of equipment maintenance records, the entry of equipment test records, the entry of equipment test reports and the entry of adverse working conditions. Equipment status maintenance involves dynamic evaluation, periodic evaluation, triggered evaluation and real-time evaluation. Online monitoring includes the entry of the online monitoring device account and the entry of the station control system. The entry specifications for primary equipment for power transmission and transformation include naming rules for substations, bays, equipment, auxiliary equipment and lines.