"This platform is like a large database, which accesses and stores all the information of Liaoning power grid relay protection equipment from commissioning to decommissioning in real time, realizes the online circulation of core business of relay protection equipment operation management and online monitoring and analysis of relevant data, and effectively improves the safety production guarantee ability and professional lean management level." On May 24, Qian Hai, the special responsibility of relay protection in the dispatching and control center of Liaoning Electric Power Co., Ltd. of the State Grid, logged into the relay protection full-service service management platform and opened the platform function modules one by one to check the latest statistical analysis of relay protection equipment operation data, rectification of hidden dangers and defects, on-site operation and renovation of old equipment.

Liaoning Shenyang Power Supply Company's relay protection professional staff used the on-site standardized operation APP to carry out the scheduled inspection of 66 kV Aifujia line protection devices. Photo by Shi Lingfeng

Relay protection is one of the "three lines of defense" for power system security and stability. In October 2022, State Grid Liaoning Electric Power built a full-service service management platform for relay protection, realizing data interaction and information sharing among multiple systems, and improving equipment state perception, predictive diagnosis and reliable operation capabilities. At the same time, the company innovates the integrated management mode of province and land, strengthens the safety control of on-site standardized operation, and ensures the safety, control and control of relay protection operation and inspection.

　　Bring together professional big data to achieve comprehensive integration of business data

"There are many application systems in relay protection specialty, such as relay protection statistical analysis and operation management system, relay protection condition maintenance and auxiliary decision-making system, fixed value notice circulation system, etc." Tian Jingfu, Director of the Relay Protection Division of the Liaoning Electric Power Dispatching and Control Center of the State Grid, said, "Each system is independent in application, and there are certain differences in application scenarios, data management modes, and data interaction modes, which affect the comprehensive application effect."

It is imperative to simplify the complexity and build a unified relay protection management platform. State Grid Liaoning Electric Power to identity uniqueness, channel configuration consistency, device naming standardization, one-time modeling correctness, category refinement professional as the focus, to carry out relay protection basic data governance work. With 46719 problem data cleared, the qualified rate of data quality of all 51770 sets of relay protection devices in Liaoning power grid substation reached 100. The company has solved the problem of independent operation of different application systems of relay protection, formed a unified interface standard, and realized the accuracy of data entry of basic equipment ledger by 100, the integrity rate by 100 and the timeliness rate by 100.

Relying on the results of basic data governance, Liaoning Electric Power of the State Grid has carried out online centralized control of core businesses, and has built a relay protection full-service service management platform with information sharing, reasonable and open structure, efficient and orderly operation, providing power supply employees with services such as equipment information inquiry, technical renovation project management, hidden danger defect management, on-site operation support, drawing and file data retrieval, etc.

Take the project management of relay protection reserve as an example. According to the previous project management requirements, professionals need to export the ledger data of the relay protection statistical analysis system, screen the protection equipment that meets the requirements one by one offline, manually classify and summarize, describe the construction contents, create reserve items, and enter them into multiple application systems. The labor intensity is high and it is difficult to ensure the accuracy of the data. Moreover, the data of different application systems are incompatible and unrelated, and cannot be directly retrieved and used, thus affecting the convergence of later project planning and project implementation.

The relay protection full-service service management platform covers the whole process of pre-project necessity review, project reserve establishment, feasibility study investment estimation, plan distribution adjustment, material and service procurement, preliminary design, on-site start-up to completion final accounts, and can also evaluate the rationality and important urgency of each equipment renovation. During the implementation of the project, the platform can online supervise and manage the procurement of materials and services, preliminary design and on-site construction, and share information with other application systems in real time to ensure that the transformation data of each protection device can be queried, used and traceable.

　Developing Business Application Modules to Improve Professional Management Level

On May 19, at the first-line protection inspection site of 66 kV Shengyang in 220 kV Shengli Substation of Fushun Power Supply Company, the operators completed the inspection of line protection devices and the rectification of potential safety hazards by using the on-site operation and hidden danger defect management function module of the relay protection full-service service management platform.

Before the relay protection full-service service management platform goes online, the establishment of a hidden danger management list, the listing of work plans, and the submission of hidden danger rectification all need to be completed manually offline, which is prone to problems such as inadequate implementation of requirements, omissions in work, and untimely data statistics. State Grid Liaoning Electric Power has developed a hidden danger defect management function module on the platform for the management of the operation safety hidden danger process of relay protection equipment, and has included the relay protection equipment with potential safety hazards found in special hidden danger investigation, various safety inspections and equipment operation inspection into the supervision scope of the hidden danger defect management function module.

The module will calculate the priority of hidden danger treatment based on the level, classification, content, impact degree of defect hidden danger, and at the same time, according to a equipment maintenance plan, automatically associate matching the corresponding interval protection hidden danger defect data, optimize the defect hidden danger management arrangement. After the hidden danger is rectified and the data is uploaded, the platform will automatically fill in the hidden danger handler and completion time. During the spring inspection this year, Liaoning Electric Power of the State Grid relied on the platform to control 41 potential safety hazards of relay protection, 68 familial defects and 209 common defects.

"We have not only developed a hidden danger defect management module for the platform, but also developed functional modules such as equipment management, project management, on-site operation, maintenance plan, data inquiry, etc. in combination with the actual work of relay protection specialty." Qian Hai introduced.

　Full-chain control of mobile terminals to ensure on-site standardized operations

On May 23, in the protection room of 220 kV Aiguo Substation, Yu Xiaolong, a relay protection professional of Shenyang Power Supply Company, used the on-site standardized operation APP to scan the physical ID code pasted on the 66 kV Aiguo Line protection device to verify the information of each device. The relay protection full-service service management platform immediately generates a standardized regular inspection process for relay protection devices corresponding to this operation, including key regular inspection steps such as safety measures tickets, pressure plate confirmation forms, standardized operation instructions, etc. "Now, confirm that the outlet pressure plate of the Aiwu line protection device is in the exit state, and the next operation can be carried out." Yu Xiaolong instructed his colleague Wu Tong to start the regular inspection according to the workflow generated by the platform.

In order to facilitate the use of operators, Liaoning Electric Power of the State Grid relies on the relay protection full-service service management platform to develop on-site standardized operation APP to realize intelligent control of the full-service chain of relay protection equipment maintenance. For on-site operation scenarios such as device inspection, exception handling, protection replacement, patrol inspection, etc., operators can receive task work orders through on-site standardized operation APP scanning codes, and complete processes such as safety measure verification, risk identification and confirmation according to APP guidelines. Operation staff can also use APP to quickly obtain electronic drawings, previous equipment inspection reports and other data. After the job is completed, APP will automatically generate an unmodifiable inspection report.

"Now we don't need to carry paper materials such as field drawings and device instructions. Field operations only need to be completed and confirmed item by item on the mobile terminal to form a regular inspection report in a standardized format." Yu Xiaoguang said, "This can also reduce the pressure of the operation, standardize the operation process, and prevent uncertain factors from affecting the operation."

At present, Liaoning Electric Power of the State Grid has built a technical support system for relay protection based on on-site operation scenarios, continuously carrying out standardized operation, safety measures control and risk identification at dangerous points, thus improving the quality and efficiency of on-site operation and the operation reliability of relay protection equipment. During the spring inspection, the company relies on the platform to ensure the safe and efficient development of 45 relay protection device acceptance, regular inspection and other operations, realizing the process of task work, online data and information, standardization of on-site operation, real-time risk control and intelligent defect diagnosis, and promoting the digital transformation of the traditional on-site operation mode of relay protection.