Due to the complex structure of urban distribution networks, which are mostly cable and overhead mixed lines, and the neutral point is often grounded through arc suppression coils, when the system is single-phase grounded, the grounding current at the fault point is often weak, making it difficult to directly select the fault line by steady-state electrical quantities. This article creatively proposes a fault line selection method that combines transient zero sequence current and wavelet decomposition. The method quantifies the fault characteristic values and provides a fault diagnosis logic. Multiple sets of simulation data show that the fault line selection method proposed in this paper is not affected by factors such as distribution network structure, fault point location, closing angle during grounding fault, and resistance of fault point, and has good prospedts for engineering application.

The proposed practical case takes the signal acquisition project of BeiDou satellite system as the demands traction. The teaching case contains the knowledge and theory learned in the backbone courses, such as analog electronics, digital electronics, integrated circuit design, signals and systems, into the design of analog-to-digital conversion (ADC) circuit. It is expected to provide a coherent body of knowledge that will enable the students to use it for learning purposes. The practical case is a comprehensive, design-based experiment. According to the teaching design concept and the task requirements of the three levels (basic tasks, competence enhancement and engineering application), students complete the design of each unit in turn in accordance with the electronic system design process. Through the design of the competence enhancement and engineering application parts, the students' sense of innovation and enterprise is stimulated, their ability to solve practical problems is enhanced and their thinking about system design and engineering application is cultivated.

The concept and technology of online education are applied to experimental teaching, and the research and exploration are conducted on remote intelligent online physical experiment technology. A remote intelligent experiment system has been constructed to achieve deep integration of intelligent software and hardware systems with electronic circuit experimental teaching, and applied to electronic circuit related experimental courses. The characteristics and problems of traditional offline experimental teaching are explored, and the advantages of remote intelligent experiment system in experimental teaching are analyzed. Practice show that it breaks through the limitations of time, space and resources in traditional experimental teaching in universities, and provides students with more flexible and convenient experimental experiences, and plays an important role in improving students’ self-learning and innovation abilities.

In order to actively respond to the new round of scientific and technological revolution and industrial transformation, and explore the innovative teaching design of the curriculum suitable for the cultivation of new engineering talents, taking the electronic design automation (EDA) technology course of electronic information major as an example, this paper proposes a teaching reform plan of “three new integrations, three methods in one, and three views strengthening”. “Three new integrations” organically integrate new EDA development tools, new field programmable gate array (FPGA) devices and new online hardware debugging methods into the traditional teaching content. Combined with the teaching method, the collaborative teaching method of tool platform and the project-driven method, the “three methods in one” teaching mode is established, which not only allows students to master theoretical knowledge, but also helps to improve the practical engineering ability of students. The design of “three views strengthening” experiment cultivates the ability of students to carry out system-level design and innovative design for practical engineering problems. Through this teaching reform, students were organized to participate in the 2023 National College Student Electronic Design Competition and won two second prizes in the Hainan Provincial Division, and a school-level education reform project based on the curriculum reform was approved in the same year.

Joint Sino-foreign education is a new model of higher education reform and an important way of cross-cultural education. The course-based ideological and political education of which is a new task of higher education in the new era. The electrical and electronic engineering course of Ulster College of Shaanxi University of Science and Technology is taken as an example of joint Sino-foreign education to discuss how to combine professional characteristics, dig deeply into ideological and political elements, in order to realize the natural integration of course-based ideological and political education, as well as the imperceptibly cultivation of virtues, and promote the same direction development of knowledge imparting and value leading. This practice not only enriches the connotation of course-based ideological and political education, but also provides reference for the ideological and political education of Sino-foreign cooperative projects under the background of globalization.

In order to effectively cultivate excellent talents who can overcome difficulties in the field of analog electronic technology, so as to effectively support China’s strategic goal of becoming self-reliant and self-improving in science and technology, and to address three major challenges of difficult knowledge system construction, theory and practice disconnection and difficultly persistent active learning in course teaching, this paper takes students as the center, uses information technology to reconstruct teaching content, enrich teaching resources, innovate teaching design and optimize teaching evaluation Thus students’ learning is personalized and efficient, and students’ development becomes comprehensive, which achieves the training goals of knowledge learning, ability training and quality improvement.

In the context of a full credit system, the course Foundations of Mathematics for Artificial Intelligence faces the challenge of linking foundational mathematical knowledge to real-world engineering problems. This paper introduces the teaching philosophy of “integration of theory and practice” and the model of “interest inspiration-project progression-AI coaching-classroom competition”, supported by diverse evaluation mechanisms to ensure course objectives are met. Curriculum reform has led to excellent student performance, with an average score of 3.61, far surpassing the 3-point graduation benchmark, and a 93% pass rate. Surveys show that 100% of students appreciate the course content design and its comprehensive assessment system. Additionally, 92% believe the course model significantly enhanced their learning efficiency.

In grid-forming converters with weak overcurrent capability, it is generally necessary to introduce the current limiter to ensure fault current limiting. However, the synchronization stability of the system is weakened after triggering the current limiter, which is seldom comprehensively considered and addressed in existing studies. To this end, the phasor diagram method is used to reveal the fault current characteristics in this paper. Then, the adverse impact of the current limiter on the synchronization stability of the converter is analyzed based on the power angle characteristic curves and the extended equal area criterion. Thus, a virtual inertia current limiting method for grid-forming converters with enhanced synchronous stability is proposed, which simultaneously solves the fault current limiting and synchronous stability problems of converters by quantitatively controlling the virtual inertia. Finally, the correctness of the theoretical analysis and the effectiveness of the proposed method are verified by Matlab/Simulink simulation experiments.

High impedance fault (HIF) is difficult to detect because of the low fault current amplitude and they can be easily confused with switching events. Existing HIF detection methods mainly rely on fixed time-window data. However, a fixed decision time often fails to balance the accuracy and speed of HIF detection. Thus, a sequence-adaptive HIF detection model is proposed in this paper. Firstly, zero-sequence current data of the faulty feeder are processed into variable-length training set. Then, a gated recurrent unit (GRU) model is trained based on variable-length data and cost-sensitive coefficient method to construct biased models. Two GRU models with opposite propensities are combined into an evaluation model. The test results on the PSCAD/EMTDC simulation platform show that the detection accuracy rate of this proposed model can reach 99.13%, and the detection speed is improved by at least 37.52% compared to the fixed time-window method. Delayed decision-making improves the accuracy of HIF detection and reduces the risk of harm.

Under pressure, the magnetic field outside the ferromagnetic cavity is more complex under the influence of the background magnetic field, which reduces the accuracy of magnetic detection. Therefore, a comprehensive study of the influence of background magnetic fields on spatial magnetic fields is of great significance. In this paper, a magneto-mechanical coupling model for an oxygen tank is developed based on the improved Jiles-Atherton theory, and the composition of the spatial magnetic field is classified. The influence of the background magnetic field on each component of the spatial magnetic field is simulated and calculated. By establishing the relationship between the induced magnetic field and the background magnetic field, and analyzing the influence of the background magnetic field on the magneto-mechanical coupling effect under specified pressure, references are provided for the magnetic detection.