Relay Protection Composition Block Diagram
On the morning of April 6, at the 220 kV Chengyuan Substation in Tongliao City, Inner Mongolia, Zhao Xinli led team members to verify the 2022 substation secondary system regulations and on-site device conditions item by item, ensuring the accuracy of the operation regulations compilation.
Zhao Xinli is the squad leader of the Secondary Maintenance Squad of Xincheng Substation Maintenance District, Mengdong Tongliao Power Supply Company. Over 35 years of work, he has deeply cultivated the professional field of relay protection, participated in more than 20 new construction (expansion and renovation) projects of substations, handled over a thousand relay protection abnormal alarm defects, and gradually became a technical expert in the relay protection field.
In 1987, Zhao Xinli graduated from Jinzhou Electric Power Technical School and entered the Second Engineering Company of Northeast Electric Power Administration to engage in welding work. In 1991, he came to Zhelimu Electric Power Bureau and began to work in the relay protection specialty.
Relay protection is a highly technical specialty. At the beginning, Zhao Xinli kept books in hand. To improve his knowledge reserve, he consulted the seniors in the team and self-studied advanced mathematics and other university courses. With a certain foundation, he successively self-studied professional courses such as relay protection, high voltage technology, and power system fault analysis, making rapid progress in professional ability and gradually becoming the technical leader of the relay protection specialty in the unit.
In 1998, a flood occurred in the Keyouzhongqi area of Tongliao City. More than half of the equipment in the 220 kV Youzhong Substation was soaked by floodwater and urgently needed replacement. Facing difficulties such as the coordination between the original primary equipment and the newly replaced secondary devices, Zhao Xinli, as the technical leader, reviewed drawings and books, communicated with manufacturers to demonstrate the construction plan, and completed the expansion and renovation project of Youzhong Substation with colleagues in 3 months. After this practical exercise, Zhao Xinli further integrated the characteristics of old and new types of equipment.
The 220 kV Tongliao Substation is a hub substation in the Tongliao area, not only ensuring local power supply but also undertaking the important task of energy transmission to the Northeast Power Grid. In 2006, the Tongliao Substation implemented an expansion and renovation project. As the overall person in charge of the project construction, Zhao Xinli supervised the construction progress at the site during the day, summarized construction experience in the dormitory at night, solved difficult problems encountered in the project construction, and led colleagues to complete the relocation of the main control room, civil engineering cable laying, secondary circuit improvement, and secondary equipment configuration and replacement with high quality.
In his work, Zhao Xinli actively carried out theoretical project research based on his specialty, developed multiple innovative achievements, and put forward many suggestions to reduce the burden on field operators and help the enterprise improve quality and efficiency.
Transformer differential protection testing is one of the routine inspection tests in the relay protection specialty. Due to the different operating characteristics of the differential elements of different types of transformer differential protection devices, when inspecting the slope of the ratio braking characteristic curve of transformer longitudinal differential protection on site, operators often need to recalculate according to the model of the protection device, which not only delays operation time but may also lead to the failure of equipment calibration accuracy to meet the test requirements due to manual calculation errors.
In August 2005, Zhao Xinli produced a slope conversion chart for the ratio braking characteristic curve of transformer longitudinal differential protection through multiple on-site investigations and summaries. Operators only need to input the corresponding equipment data into the table to obtain automatically calculated values. However, after on-site practice, it was found that this method requires preparing computers and other equipment on site, which is inconvenient.
With the popularization of smartphones, Zhao Xinli came up with a new idea to make the algorithm for calculating the transformer differential protection slope into a mobile application. Zhao Xinli, together with technical backbone of Xincheng Substation Maintenance District of Tongliao Power Supply Company, spent 4 months completing the APP prototype design, interface design, development, and testing. In December 2021, the "Calculate Transformer Differential Protection Slope" APP was officially launched.
The "Calculate Transformer Differential Protection Slope" APP is compatible with most mainstream smartphone models, reducing the data calculation amount of relevant operators in Tongliao Power Supply Company by 80%, shortening the on-site inspection time by more than half, and improving work efficiency by about 70% while ensuring data accuracy.
Zhao Xinli summarized his experience and successively published 4 professional papers including "Analysis of Relay Protection Action Behavior Caused by Refusal of 220 kV Line Fault Switch", led the compilation of more than 10 regulations such as "Special Regulations for On-site Operation of Substations", organized 18 professional technical trainings, and participated in 33 preliminary design reviews of projects.
On January 14, at the relay protection training room of the 220 kV Tongliao Substation of Tongliao Power Supply Company, Zhao Xinli, as the main lecturer, taught the trainees the key and difficult problems in relay protection device testing. Zhao Xinli is not only a technical backbone in the unit but also a teacher who imparts knowledge and solves doubts for young employees.
In August 2021, the "Zhao Xinli Senior Technical Engineer Innovation Studio" and "Power System Relay Protection and Secondary Specialty Joint Teaching and Research Office" led by Zhao Xinli were established. Zhao Xinli's work added another item: using these platforms to cultivate innovative teams with strong professional ability and high quality.
As a senior, he plays the role of "passing on, helping, and leading", helping and guiding apprentices to grow quickly, unreservedly explaining the basic principles of relay protection, debugging methods of low-frequency load shedding devices, and other content to young employees, and often compiling difficult problems in work into thinking questions and Q&A for young employees to think independently and analyze boldly, helping them master operational skills proficiently.
Since 2010, Zhao Xinli has successively participated in the revision and review work of the "Skill Level Evaluation Standard Question Bank" of the Human Resources Department of State Grid Corporation of China, developed 3 training courses such as "Power System Operation and Fault Analysis", and provided technical guidance for the development of relay protection series video courseware of State Grid Mengdong Electric Power multiple times. The relay protection skills competition of State Grid Mengdong Electric Power won the first place in the team competition.
From 2020 to now, Zhao Xinli has taught more than 120 class hours of various technical training courses. With his help and guidance, his 5 apprentices respectively hosted 12 quality management topics and respectively won honorary titles such as Outstanding Employee, Advanced Worker, and Supporting Talent of State Grid Mengdong Electric Power. (Yuan Xin, Liu Zeyu)
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