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    30 September 2026, Volume 0 Issue 9
    Overview
    Thoughts on Digitalization and Intelligent Transformation Pathways for Low-Voltage Electrical Apparatus in the Context of New Power Systems
    Gao Xiaotian, Hu Min
    2026, 0(9):  1-10.  doi:10.16628/j.cnki.2095-8188.2026.09.001
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    Low-voltage electrical apparatus are essential basic equipment for the development of new power systems.To address the constraints facing the industry in product sensing,complex protection and control,data interoperability,model training,and the engineering deployment and trustworthiness of large language models,literature synthesis,comparative case analysis,typical scenario analysis and life-cycle framework mapping are employed to review the foundations of digital transformation in the industry and to establish a full-life-cycle technological pathway encompassing intelligent design,intelligent manufacturing,intelligent products,and intelligent operation.The analysis indicates that industrial intelligence should be built on seamless data integration,supported by the fusion of mechanism-based models,data-driven models,and knowledge-based models.Large language models and industrial AI agents shall exert a cross-cutting effect across the whole life cycle,while standardization should provide guidance.These elements enable a closed-loop data system based on coordinated device-edge-cloud collaboration.Accordingly,a three-stage development pathway is proposed for the industry,ultimately leading to the adoption of digital twins,edge intelligence,domain-specific large language models,industrial AI agents,and software-defined products. During this transformation,the industry should advance the development of shared testbeds,security frameworks,and a standards system.

    Research & Analysis
    Design of Signal Intermittent Fault Monitoring System for Electrical Connectors
    Chen Hongcheng, Zhang Chao, Liao Yuchen, Zhang Yinnan, He Yubin, Ren Wanbin
    2026, 0(9):  11-16.  doi:10.16628/j.cnki.2095-8188.2026.09.002
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    Electrical connectors are highly susceptible to signal intermittent faults under stress environments such as vibration,shock,and temperature variation.Therefore,to accurately evaluate the influence of environmental stress levels on the reliability of electrical connectors,a system architecture integrating continuous monitoring of 8-channel contact resistance and intermittent fault signals is proposed.The designed four-wire measurement circuit enables accurate measurement and high-speed acquisition of resistance in the range of 1 mΩ to 10 Ω,and the designed FPGA-based intermittent fault monitoring circuit enables precise capture of intermittent fault events with a minimum duration of 100 ns.The proposed system is characterized by independent acquisition,synchronous transmission,and parallel analysis of multi-channel signals.Test results demonstrate that the developed monitoring system can meet the requirements of reliability test evaluation and failure mechanism research of electrical connectors.

    Fault Diagnosis of Air-Type AC Contactors Based on Sound-Vibration Fusion and Improved Temporal Convolutional Network
    Zhang Guoyue, Kang Fengnian, Cheng Xian, Qin Cong, Wang Haiyan, Zhu Zhihao
    2026, 0(9):  17-28.  doi:10.16628/j.cnki.2095-8188.2026.09.003
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    To address the problems that single diagnostic signals of air-type AC contactors are easily disturbed and difficult to extract features from,a fault diagnosis method based on sound-vibration fusion and an improved temporal convolutional network (TCN) is proposed.The sound and vibration signals are denoised using parameter-optimized feature mode decomposition (FMD) and an improved wavelet threshold algorithm,and a fault database is established.According to the closing mechanical characteristics,the signals are divided into three stages for time-domain and local energy feature extraction,followed by t-SNE-based dimensionality reduction and visualization.Based on TCN,bidirectional gated recurrent unit (BiGRU) and attention mechanisms are introduced to construct an improved TCN composite diagnostic model for enhancing long-term dependency modeling,bidirectional dynamic feature extraction and representation of key fault segments.Experimental results show that the diagnostic accuracies for three contactors reach 97.33%,94.67%,and 96.00%,respectively,outperforming traditional models and demonstrating the effectiveness and engineering applicability of the proposed method.

    Analysis of Key Factors and Influence Laws of Internal Resistance of Lithium-Ion Battery Based on Pulse Power Test
    Wang Lina, Xu Zhiqiang, Tan Liping, Zhang Wenyuan, He Yushuang
    2026, 0(9):  29-39.  doi:10.16628/j.cnki.2095-8188.2026.09.004
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    The internal resistance of lithium-ion battery is the core index to evaluate the working state of the battery.The existing model is difficult to reflect the dynamic change law of internal resistance,and lacks the quantitative relationship between internal resistance and health status.In order to reveal the influence of charge-discharge rate,state of charge (SOC) and electrode thickness on internal resistance,a one-dimensional electrochemical simulation model of graphite/NMC111 lithium-ion battery is constructed.Based on the hybrid pulse power characteristic (HPPC) test standard,the simulation is carried out in the range of 0.50C-2.00C,10%-90% SOC and 25-65 μm electrode thickness.The variation of ohmic internal resistance and polarization internal resistance is analyzed by voltage loss decomposition method.The results show that the increase of electrode thickness will significantly increase the ohmic internal resistance and polarization internal resistance.The internal resistance of the battery is strongly nonlinear with SOC,and rises sharply in the range of low SOC (≤25%) and high SOC (≥90%).The increase of discharge rate will accelerate the growth of concentration polarization internal resistance.The research results provide a theoretical basis for battery structure optimization and BMS parameter design.

    Distribution System Technology
    Key Technologies and Experimental Validation of Intelligent Primary-Secondary Integrated Eco-Friendly Gas-Insulated Ring Main Units for New-Generation Distribution Networks
    Wang Jian, Wang Jie
    2026, 0(9):  40-46.  doi:10.16628/j.cnki.2095-8188.2026.09.005
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    To address insufficient insulation margin,electric-field distortion,and limited anti-interference capability of eco-friendly gas-insulated ring main units in new-generation distribution networks,the overall architecture of intelligent primary-secondary integrated eco-friendly gas-insulated ring main units is constructed.Electric-field equalization,coordinated built-in sensor layout,measurement-chain anti-interference optimization,and coordinated control between the three-position switch and circuit breaker are adopted to integrate insulation design,measurement,and fault interlocking.Type tests and real-type single-phase grounding tests show that the prototype achieves Class 0.5 metering accuracy,a basic phase-voltage error of 0%,incoming and outgoing phase-current errors of -0.15% to +0.30% and -0.15% to +0.60%,respectively,a grounding fault identification accuracy of 100%,and an interlocking response time of less than 100 ms,meeting engineering application requirements.

    Research on Homologous Design and Synergistic Mechanism of Heat Dissipation and Waterproofing for Outdoor Low-Voltage Distribution Boxes
    Su Yadong, Zhang Huaxu, Li Jianjun, Chen Haowen, Zhou Yan, Kong Fantai
    2026, 0(9):  47-53.  doi:10.16628/j.cnki.2095-8188.2026.09.006
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    Aiming at the common industry problem of difficulty in balancing efficient heat dissipation and high-level protection of outdoor low-voltage distribution boxes,the inherent contradiction and limitations of traditional single-layer cabinet design are quantitatively revealed,and collaborative optimization research is carried out.The concept of heat dissipation-waterproofing homologous design is proposed,and a double-layer hollow composite cabinet structure based on the chimney effect is constructed,a synergistic mechanism model of heat-moisture coupling and rainwater retention is established,structural parameters are optimized through simulation and orthogonal tests,and the scheme performance via multi-dimensional tests is verified.The results show that the protection rating of the scheme reaches IP45,the core temperature rise under full load is reduced by 42.7% compared with the industry benchmark,the maximum temperature difference inside the cabinet is controlled within 6.8 ℃,the average annual maintenance frequency is reduced by 87.5%,the average annual failure outage time of a single device is reduced by 92%,and there is no condensation,rainwater ingress or overheating fault during the whole process.A technical path can be provided for the high-reliability design of end-user outdoor power distribution equipment in new-type power systems.

    Construction and Application of Intelligent Anti-Misoperation Knowledge Graph for Substation Switching Operations
    Liu Jiaming, Qiao Jibin, Liu Dong
    2026, 0(9):  54-64.  doi:10.16628/j.cnki.2095-8188.2026.09.007
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    To address the problems that current operation tickets lack effective anti-misoperation verification means and suffer from low intelligence level,a knowledge-graph construction method for intelligent anti-misoperation of substation switching operations is proposed.Firstly,using professional corpus data of power grid equipment,a deep learning model training method is adopted to construct a power grid equipment connection relationship graph,an error prevention regulation graph,and a historical operation ticket graph,and automatically fuse them to form an intelligent error prevention knowledge graph.Then,experiments are designed to verify the effectiveness of the error prevention model,with an F1 value of 80% and an accuracy rate of 95%.Finally,the intelligent anti-misoperation knowledge graph is managed with high-level visualization by adopting the Neo4j graph database,and the corresponding whole-process application workflow is provided,which effectively improves operators’ emergency-handling capabilities when encountering switching-operation faults.

    Research on Multi-Dimensional Carrying Capacity Assessment Method for Electric Vehicle Integration into Distribution Networks Considering Spatiotemporal Coupling
    Bao Yude
    2026, 0(9):  65-75.  doi:10.16628/j.cnki.2095-8188.2026.09.008
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    To address the security challenges posed by the integration of Electric Vehicles (EVs) into distribution networks and the limitations of existing assessment methods in spatiotemporal dynamics and multi-constraint coordination, a multi-dimensional carrying capacity assessment method for EVs considering spatiotemporal coupling and operational constraints is proposed. The method constructs a spatiotemporal probabilistic model for EV charging demand based on trip chain-geographic information, using a bimodal Weibull mixture distribution and a hierarchical Poisson point process to achieve spatiotemporal coupling. An assessment framework integrating voltage security, line thermal stability, and protection coordination is established, employing an improved sequential Monte Carlo simulation for dynamic verification. A three-dimensional index system encompassing technical, economic, and resilience aspects is built, and the entropy-weight-TOPSIS algorithm is introduced to generate a comprehensive carrying capacity index. Simulations show that with unupdated protection settings, the comprehensive carrying capacity is 37.2%. After optimizing protection settings, the physical limits of grid equipment become the core limiting factor. Implementing an orderly charging strategy can increase the carrying capacity to 41.8%. The research provides a theoretical basis for the precise planning and operation of distribution networks with high-penetration EV integration.

    Electrical Design & Discussion
    Research on DC 1 500 V High-Breaking Non-Polar Miniature DC Circuit Breaker
    Yu Xiaoting, Tang Ting, Gu Xiang, Sun Binpeng
    2026, 0(9):  76-82.  doi:10.16628/j.cnki.2095-8188.2026.09.009
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    With the rapid progress of new energy technology,the system voltage is increasing,and the breaking performance of DC circuit breaker is more stringent.DC miniature circuit breaker plays an important role in DC systems,which provides overload,short circuit and other protection for DC loads.The key interruption challenges of DC miniature circuit breakers are focused on,and performance enhancement research is conducted.Using series double break point to increase contact distance,“V” type dislocated arc extinguishing chamber and high performance gas-generating material to optimize air flow channel and arc extinguishing system,combining with simulation to enhance the rapid arc transfer capability.The test results show that the critical load current,electrical life,short-circuit breaking capacity and other key indicators are qualified.The research can provide technical reference for the design and application of high-voltage DC miniature circuit breakers.

    A Voltage Disturbance Differential Method for Online Monitoring of HVDC Fuse Status
    Yang Rui
    2026, 0(9):  83-87.  doi:10.16628/j.cnki.2095-8188.2026.09.010
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    Aiming at the difficulty in online monitoring of protective fuse status for rectifier modules of HVDC systems in data centers, an online monitoring method based on the voltage disturbance differential technique is proposed. This method requires no extra hardware and is realized via controller software upgrade. By adopting intelligent inspection and the “timed+dynamic” composite strategy, controllable voltage disturbances are actively injected.The output voltage of rectifier modules and bus voltage are compared through differential calculation to realize accurate identification of fuse status. Experimental results demonstrate that fuse status can be identified within 1-3 s with 100% accuracy.The bus-voltage fluctuation is superior to the ±1.0% specified in GB/T 38833—2020, and no attenuation occurs in system load-carrying capacity. Featuring high compatibility and practicality, this technology can be seamlessly integrated into the operation- and- maintenance platform to replace manual inspection.It improves the power-supply reliability and operation-automation level of HVDC systems, and provides support for intelligent operation- and- maintenance of AI computing data center HVDC systems.