Core Viewpoint - The successful operation of China's first "integrated wind-solar-fire-storage" transmission project marks a significant advancement in the country's high-voltage direct current (HVDC) technology, showcasing the development of intelligent protection systems for power grids [1][4]. Group 1: Historical Context and Development - In the 1970s to 1990s, over half of the stability issues in China's power grid were attributed to relay protection defects, with high-end protective equipment being largely imported and costly [2]. - Zheng Yuping, a key figure in the development of relay protection technology, has dedicated over 40 years to advancing this field, transitioning from reliance on foreign technology to achieving self-sufficiency and innovation [2][8]. Group 2: Technological Innovations - Zheng's team developed a high-sensitivity directional protection method for high-voltage lines, leading to the creation of complete protective devices for ultra-high voltage transmission lines, generating over 5 billion yuan in value [2][3]. - The team achieved a market share of over 60% in the large-capacity generator transformer protection market, with products exported to over 20 countries [3]. Group 3: Challenges and Solutions - The complexity of modern power grids presents new challenges for traditional protection technologies, necessitating innovative solutions to ensure safety and reliability [4][5]. - Zheng's team established a differential protection technology system to address the evolving characteristics of complex grid faults, significantly enhancing fault identification and response times [4][5]. Group 4: Future Directions - With the rise of new energy systems, there is a pressing need for updated relay protection technologies to adapt to changing fault characteristics [7]. - Zheng proposed a new relay protection principle based on time-domain equivalent models, aiming to create a system that does not rely on power source characteristics, which is currently being applied in various modern energy scenarios [7].

Company Overview - Beijing Sifang Automation Co., Ltd. was established in 1994 and is primarily engaged in the manufacturing of computers, communications, and other electronic equipment with a registered capital of 832.251 million RMB [2] - Beijing Sifang Jibao Engineering Technology Co., Ltd. was founded in 2003 and focuses on the manufacturing of instruments and meters with a registered capital of 1.05 billion RMB [2] Patent Application - Beijing Sifang Jibao Engineering Technology Co., Ltd. applied for a patent titled "A Method for Automatic Identification of Multi-Bus CT Disconnection and Relay Protection Device," with publication number CN119994780A, on January 2025 [1] - The patent describes a method that includes obtaining multidimensional interval data models from each section within a station, creating a bus-interval two-dimensional grid map, and processing the grid map to identify isolation zones and calculate differential protection currents [1] - This invention aims to effectively identify various types of CT disconnections faced by relay protection devices and accurately locate the specific position of CT disconnections, enhancing the accuracy of CT disconnection judgment in complex bus structures [1] Investment and Business Activities - Beijing Sifang Jibao Engineering Technology Co., Ltd. has made investments in 5 companies and participated in 5,000 bidding projects, holding 792 patents and 13 administrative licenses [2] - Beijing Sifang Automation Co., Ltd. has invested in 21 companies, also participated in 5,000 bidding projects, and holds 1,674 patents along with 42 trademark registrations and 19 administrative licenses [2]