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 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.

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.

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.

The discharge rod is crucial for the safety of working personnel in substations. However, traditional discharge rods have long discharge times and low work efficiency. A rapid discharge rod is designed to achieve rapid discharge of residual voltage in equipment while avoiding damage to the equipment caused by excessive discharge current. On the basis of the traditional RC discharge circuit, inductive elements are added to form RLC and RL discharge circuits. By selecting RLC circuit or RL circuit through metal-oxide-semiconductor field-effect transistor (MOSFET), rapid discharge of equipments can be achieved, thereby improving the work efficiency of operators.

Establishing the correlation between macrolevel indexes and power supply reliability is essential to analyzing the power supply reliability of distribution network on a large scale (provincial and municipal). However, the existing methods rely on the detailed distribution network topology, which is difficult to meet the requirements of regional power supply reliability analysis. This paper firstly establishes a macrolevel index system of power supply reliability for planning, construction, operation and management of distribution networks. Then a calculation method of power supply reliability is proposed by taking into account the automated isolation of distribution networks and pre-scheduled outages. On this foundation, the calculation method of power supply reliability based on the macrolevel index system is proposed by dividing the equivalence assessment sub-models and calculating the parameters of the sub-models. Finally, a case study is carried out to verify the proposed method. The results show that the relative deviation between the calculation results of the proposed method and the actual data is within 11%. The method proposed in this paper can analyze power supply reliability in the region by using only the macrolevel indexes, which provides a certain degree of accuracy and operability for the planning of distribution networks, reliability management and reliability target setting.

Aiming at the problems of dense distribution of elements, similar elements and large number of small-sized elements in power dispatching control system diagrams, which lead to poor recognition effect, an improved you only look once v7 (YOLOv7) element recognition method for the power dispatching control system diagrams is proposed. Firstly, the lightweight dilated reparam block net with cross stage partial and efficient layer aggregation network (DRBNCSPELAN) module is used to replace the efficient layer aggregation network (ELAN) module in the backbone network to capture spatial patterns of different scales simultaneously. Secondly, an information-guided fusion module is proposed to replace the Concat in the neck network, and the sequeeze-and-excitation (SE) attention mechanism is integrated to enhance the global information interaction ability. Then, the minimum point distance intersection over union (MPDIoU) loss function is introduced to improve the recognition effect of the element bounding box. Finally, experimental validation is performed via the power dispatch control system diagram dataset. The results show that compared with the baseline model, the precision, recall and mean average precision of the proposed method are improved by 5.1 percentage points, 3.1 per-centage points and 3.5 percentage points respectively, which is helpful to achieve accurate recognition of elements in the power dispatching control system diagrams.

DC optical current transformer (OCT) is an important equipment in high voltage direct current (HVDC) transmission project. Its safety and stability is of great significance to the power grid. In this paper, the causes of a DC optical current transformer fault at a converter station are analyzed and the possible location of the fault is investigated. Finally, it is determined that the change in the characteristic parameters of the fault is caused by the cracks produced after the long term deterioration of the optical fiber melting point. This work is of certain reference value for fault analysis of the OCT in engineering.

Three-phase grid-connected inverters are usually digitally controlled, and due to the negative damping effect brought about by the digital control delay, grid-connected inverters are prone to interact with the grid impedance (capacitive reactance) to produce high-frequency harmonic resonance when they are connected to the grid, which seriously affects the safe and stable operation of the power system. For the negative damping problem brought about by the controller delay, the low-frequency coupling effect of the inverter is ignored, and a high-frequency impedance model is established to reveal the high-frequency resonance mechanism, and the results show that the negative damping brought about by the delay exists a high-frequency resonance risk in the resonance peak interacting with the grid impedance. To improve the high-frequency resonance stability, based on the idea of passive design of the control loop, an approximate high-frequency passive composite impedance shaping is carried out for the grid-connected current loop control, and the parameter design process is given. An approximate high-frequency negative damping offset is achieved by modifying the control loop to enhance the stable operation capability of the system. Finally, the effectiveness of the proposed method is verified with Matlab/Simulink.

The fault current limiter can effectively limit the fault current level in a very short period of time, so as to prevent excessive short-circuit current from causing potential harm to the safe and stable operation of the power system and electrical equipment. It has become a key equipment to suppress short-circuit current in the power system. In this paper, the working principle of the fault current limiter is summarized firstly. Then, the influence of the installation position of the fault current limiter on the busbar differential protection under different main wiring modes is discussed in depth. The research results show that the action of the fault current limiter may reduce the sensitivity of the busbar differential element. Through the scientific and reasonable arrangement of fault current limiter and the reasonable setting of differential restraint coefficient, it can effectively prevent the rejection of busbar differential protection and ensure the safe and stable operation of power system.