最新刊期
- 摘要：In complex electromagnetic environments, the weak transient fault characteristic signals of high-voltage circuit breakers are easily overwhelmed by strong power-frequency interference and spatial electromagnetic coupling. To address this issue, this paper proposes a state monitoring method for high-voltage circuit breakers based on quantum sensing and edge intelligence. This method utilizes diamond NV center quantum sensing technology to acquire magnetic field data and solves the spin energy level Hamiltonian to achieve high-precision magnetic measurements; it incorporates a sliding window adaptive threshold filtering mechanism and an exponential weighted smoothing model to eliminate outliers from the raw data stream and perform trend smoothing; finally, the processed data is fed into a convolutional neural network incorporating physical constraints to extract features and learn the complex nonlinear mapping relationship between magnetic field data and equipment status, thereby enabling accurate identification of the operating condition. Experimental results demonstrate that in environments with strong electromagnetic interference, the signal-to-noise ratio of this method remains stable at above 30 dB, the state identification rate reaches 96.2%, and the false alarm rate is only 2.3%; this approach can effectively identify multi-parameter anomalies in high-voltage circuit breakers, providing a feasible solution for the state monitoring of electrical equipment in complex electromagnetic environments.关键词：Quantum Sensing;Edge Intelligence;NV Center;Sliding Window;adaptive threshold;Data Monitoring1|0|0更新时间：2026-10-16
- 摘要：To address the problem of severe electromagnetic interference in the partial discharge (PD) detection of the high-voltage power modules, which are the core components of the converter valve, this paper proposes an anti-interference detection method based on spectral separation for ultra-high frequency (UHF). This method first distinguishes the frequency domain characteristics of the partial discharge signal from the interference signal through spectral analysis. On this basis, a cascaded design scheme of a 500 MHz high-pass filter and a 700 MHz-1.2 GHz band-stop filter is adopted to achieve effective separation of the two types of signals in the frequency domain. Combined with a low-noise amplifier circuit, a complete anti-interference detection system is constructed. Experimental verification shows that this system has high sensitivity and reliability, with a minimum detectable discharge quantity of 10 pC, and the amplitude of the UHF signal is linearly related to the apparent discharge quantity at a ratio of 1.28:1. Moreover, this technology reveals the partial discharge characteristics of the high-voltage power module under square wave voltage: the discharge is mainly concentrated at the edges of the square wave, and the amplitude of the discharge at the falling edge is 1.8 times that of the rising edge; the starting voltage of the partial discharge increases with the frequency. This method has a convenient sensor layout and outstanding anti-interference ability, providing an effective solution for the online monitoring of the insulation state of high-voltage power device packaging.关键词：partial discharge;converter valve;power module;UHF;anti-interference;packaging insulation6|6|0更新时间：2026-10-12
- 摘要：The seismic performance of the coupled system comprising wall bushing, valve hall and firewall in converter stations is critical to operational safety. While existing research predominantly focuses on the seismic behavior of individual components, there is a notable lack of collaborative seismic mitigation strategies for the structural system as a whole. This paper establishes an equivalent theoretical model for the structural system integrating wall bushing, valve hall, and firewall, and conducts parametric optimization analyses for viscous dampers, metallic dampers, and friction dampers. Utilizing ABAQUS finite element models, seven seismic waves were selected to validate the effectiveness of the proposed seismic mitigation schemes and to compare the control efficacy of different damper types. The results indicate that the established equivalent theoretical model aligns well with the finite element analysis outcomes, enabling the rapid optimization of core parameters for various damper types. All three damper types effectively control the dynamic response of the wall bushing; notably, the energy dissipation efficiency of friction dampers is independent of the vibration frequency of the coupled system and presents the optimal seismic control performance, which can reduce the peak stress response of wall-through bushings by 50%-60% and lower the acceleration amplification factor by 30%-40%.关键词：wall bushing;Valve hall structure;Firewall structure;Seismic Damping Mechanism;Dynamic response analysis12|13|0更新时间：2026-09-29
- 摘要：To address the problem that the contact fingers of gas-insulated metal-enclosed transmission lines (GIL) are subject to wear degradation caused by the long-term micro-vibration environment induced by electrodynamic forces during operation, current studies based on high-current test platforms are constrained by site limitations, sensor placement, and economic costs, which hinder flexible parametric investigations. Therefore, an equivalent test platform employing a novel mechanical exciter for GIL was developed based on the equivalence principle derived from the theory of distributed-parameter systems. On this platform, vibration response tests were carried out under two scenarios: current-carrying without excitation, and long-duration excitation without current. The results indicate that the mid-span vibration response characteristics of a simplified beam element under concentrated harmonic load and uniformly distributed harmonic load are consistent. Under current-carrying conditions, the vibration acceleration exhibits a progressive increase with the load current. The vibration responses obtained by the novel excitation method are in good agreement with the measured results under current-carrying conditions. This novel excitation method can be applied to investigate the vibration response characteristics of GIL pipelines and related topics, as long as the structures where the equivalent model is highly similar to the original model and the dynamic response is dominated by the fundamental frequency mode.关键词：Mechanical excitation method;Exciter;GIL pipeline;Vibration response characteristics14|15|0更新时间：2026-09-29
- 摘要：Field insulation testing is the most cost-effective and efficient means of verifying equipment reliability before GIS commissioning. However, current partial discharge (PD) monitoring technologies used in field insulation tests, typically represented by UHF and ultrasonic live detection, have shortcomings in terms of effective monitoring duration, PD sensitivity, and field application criteria. To address these issues, this paper proposes a highly sensitive PD detection method suitable for the entire process of field insulation testing of UHV GIS. The method enables the measurement and analysis of all raw PD signal pulses during the test, and by adopting an approach of “test voltage characteristic acquisition – external triggering of the PD acquisition unit,” it achieves accurate PD pattern measurement under non-power-frequency voltage conditions encountered in field testing. A UHF PD signal denoising algorithm based on coherent averaging is investigated, which can reduce the background high-frequency noise from around 20 mV to below 1 mV in field measurements. The proposed method was applied during the field testing of a 1100 kV GIS at a UHV substation, where it successfully detected an abnormal PD phenomenon caused by metallic foreign objects inside a circuit breaker. Subsequent internal inspection after opening the cover revealed ablation traces from the foreign object, and the defect was eliminated. These results validate the effectiveness of the proposed PD detection method and signal processing approach.关键词：UHV GIS;insulation test;UHF;partial discharge;metal particles;defect location19|24|0更新时间：2026-09-21
- 摘要：Polypropylene, as an environmentally-friendly thermoplastic material, is widely employed in high-voltage cables. However, the cables are prone to form water dendrites when they are in a humid environment for a long period of time, leading to the degradation of their insulating properties. The diffusion of water molecules seriously restricts the rapid advancement of polypropylene. In addition, SiO2 nanoparticles have been proven to enhance the insulating properties of the material, but the mechanisms underlying the impact of water molecule diffusion caused by nanoparticles modified with silane coupling agents remain inadequately studied. To address this, this study employs molecular dynamics simulation techniques to construct interface models of SiO2 nanoparticles/water-containing polypropylene, both unmodified and modified with different coupling agents (KH570 and KH792), aiming to delve into their underlying mechanisms at the molecular level. The results indicate that the effects of various coupling agent modifications results on the diffusion of water molecules are different, among which the KH792-modified SiO2 nanoparticles/water-containing polypropylene interfacial structure has the strongest interaction energy between water molecules and polypropylene with the smallest free volume fraction, which has a better inhibition effect on the movement of water molecules in polypropylene. It provides theoretical support for further research on nanoparticle-modified polypropylene composites materials.关键词：polypropylene;molecular dynamics;nano SiO2;silane coupling agent13|4|0更新时间：2026-09-17
- 摘要：Temperature-rise prediction of the main conductive system of high-voltage DC disconnectors is of great significance for equipment thermal design, hotspot identification, and condition assessment. In this paper, a graded thermal network modeling method oriented toward complex thermal behavior identification is proposed. Based on FEM electro-thermal coupling results, the regional thermal behavior complexity is identified in terms of local heat-source concentration, temperature-rise gradient enhancement, and heat-flow path deflection, thereby enabling graded construction of the thermal network model for the main conductive system. Taking a 408 kV disconnector as the study object, finite-element electro-thermal coupling analysis is carried out to extract the characteristics of current density, temperature field, and heat-flow field. Regional complexity indices are established, and explicit contact thermal resistance, equivalent-parameter thermal networks, and lumped-parameter thermal networks are adopted for graded modeling of different regions. Two current-carrying conditions, namely 5 000A and 8 000A, are selected for comparison, and an 8 000 A DC temperature-rise test is conducted. The results show that the contact–finger interface is the key region for temperature-rise prediction. The graded thermal network is consistent with FEM results in terms of temperature-rise trend and hotspot location. For 15 experimental measurement points, the average relative error is approximately 2.3%, and the maximum relative error is approximately 3.1%, indicating high prediction accuracy. The proposed method can improve the local temperature-rise characterization capability of key contact regions while controlling the scale of the thermal network, thereby providing a reference for temperature-rise prediction and thermal design optimization of high-voltage DC disconnectors.关键词：High-voltage DC disconnector;temperature-rise prediction;complex thermal behavior;graded thermal network;FEM13|0|0更新时间：2026-09-07
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Research on multi-objective control strategy of power conversion system under asymmetric voltage sag
摘要：When asymmetrical voltage dips occur in the power grid, it will adversely affect the safe grid integration of energy storage. A multi-objective control strategy for power conversion system (PCS) under asymmetrical voltage dips is proposed. The strategy takes supporting the grid-connected point voltage to a safe range as the primary objective, and designs two sets of voltage reference values, which can be selected according to the magnitude of the actual negative sequence voltage. Subsequently, the optimal voltage support method is determined by the Lagrange multiplier method, and the constraints of PCS output current and active power fluctuation are considered to ensure the safe operation of the grid-connected system during faults. When supporting the voltage at the grid-connected point to a safe range, the voltage unbalance is further suppressed according to the PCS residual capacity margin to improve the voltage quality. Finally, the effectiveness of the proposed strategy is verified by MATLAB/Simulink. When the voltage transient degree is small, it can not only ensure the voltage support effect, but also better limit the active power fluctuation; when the voltage transient degree is large, it can give the grid-connected system more abundant non-off-grid operation time.关键词：power conversion system;Grid-connected energy storage;asymmetric voltage sag;Voltage Support;active power fluctuation suppression10|0|0更新时间：2026-09-02 - 摘要：With the increasing voltage level of vacuum circuit breakers, the dynamic contact load on the cam of the spring operating mechanism increases, raising the risk of contact fatigue failure. Conventional cam design usually treats contact strength as a post-checking index and lacks profile optimization driven by dynamic contact stress feedback. To address this issue, a closing profile optimization method based on co-simulation and Hertz contact theory is proposed. NURBS control points are used as design variables, the maximum dynamic contact stress is minimized, and contact strength criteria and mechanism motion constraints are imposed. The optimization model is solved by sequential quadratic programming within an Adams-MATLAB co-simulation framework. A 252 kV vacuum circuit breaker is used for verification. The results show that the maximum contact stress decreases from 1287.8 MPa to 1019.6 MPa, and the maximum normal contact force decreases from 87.1 kN to 72.8 kN, with reductions of 20.8% and 16.4%, respectively. The maximum operating pressure angle and follower angular acceleration are also reduced, indicating improved cam transmission characteristics. After 10 000 mechanical endurance cycles, no pitting, peeling, or abnormal wear is observed on the cam working surface. The proposed method reduces the dynamic contact stress while ensuring closing mechanical characteristics, providing a reference for reliability optimization of key transmission components in high-voltage vacuum circuit breakers.关键词：vacuum circuit breaker;cam;Co-simulation;Hertz Contact Theory;SQP18|25|0更新时间：2026-08-27
- 摘要：Potential transformers are frequently exposed to harsh operating conditions. Under various overstresses, local inter-turn short circuit faults may occur in the winding insulation, which affects the metering performance and operation safety of the equipment. However, the existing research on the leakage flux distortion and local overheating caused by the local inter-turn short circuit fault of the potential transformer is relatively insufficient, and it is difficult to reveal the influence of the short circuit position and the number of turns on the distribution of the magnetic-thermal field. In addition, the existing fault identification features mostly focus on single point amplitude or local state, which is difficult to describe the spatial difference of fault response, resulting in limited identification ability of different fault states. In order to solve the above problems, this paper proposes a method for identifying the inter-turn short circuit fault of potential transformer driven by magnetic-thermal axial distribution characteristics: Based on COMSOL finite element software, the field-circuit coupling and magnetic-thermal coupling simulation models are constructed, and the axial distribution sequences of leakage flux and temperature are extracted to construct the magnetic-thermal axial distribution morphological characteristics used to characterize the fault response. Furthermore, the Bayesian optimized extreme gradient boosting ( XGBoost ) model is used to classify and verify the single physical quantity feature and the magnetic-thermal fusion feature to evaluate the effectiveness of the feature system. The simulation results show that the short circuit position mainly affects the axial distribution area of the magnetic-thermal anomaly response, and the number of short circuit turns mainly affects the magnetic flux leakage amplitude and the temperature rise of the hot spot. The model identification effect is the best under the magnetic-thermal fusion feature input, and the accuracy rate is 96.15 %.关键词：potential transformer;Inter-Turn Short Circuit Fault;Magnetic-Thermal Coupling;Axial Distribution Characteristics;fault identification17|20|0更新时间：2026-08-25
- 摘要：The double pulse test is one of the important characterization tests for integrated gate-commutated thyristor (IGCT) and is commonly used to analyze and evaluate the device's dynamic performance. However, the stray inductance of the loop in double pulse test generates an induced voltage when the IGCT is turned off, which together with the bus voltage results in an overvoltage on IGCT. Excessive stray inductance can lead to errors in the dynamic characteristic measurement, or even damage the device.To address this issue, this paper proposes a novel approach to reduce the loop stray inductance and optimize the IGCT double pulse test platform using particle swarm optimization (PSO) algorithm. First, the three-dimensional models of components in the double pulse test loop are developed, including the IGCT fixture, the diode fixture and the clamp capacitor. Their spatial configuration is parameterized for representation. The optimization range for spatial configuration parameters is defined, considering the constraints imposed by connection sequence and insulation spacing. Then, the PSO algorithm is employed to find the optimal spatial configuration of platform with the minimum value of stray inductance. Finally, the circuit simulation verifies that the proposed optimization approach can effectively suppress the overvoltage amplitude when the IGCT is turned off. The physical double pulse test platform is constructed based on the optimized spatial configuration, and the experiments are conducted. Comparing the experimental results and simulation results, it can be observed that the discrepancy between the two remains consistently within a small range, further demonstrating the feasibility of the proposed approach.关键词：IGCT;Double pulse test platform;stray inductance;Spatial configuration;PSO algorithm19|17|0更新时间：2026-08-13
- 摘要：To address the insufficient prediction accuracy of traditional deterministic simulation methods for Very Fast Transient Overvoltage (VFTO), which stems from ignoring the stochasticity of disconnector breakdown voltage, this paper proposes a high-precision probabilistic simulation method driven by measured data. Based on the measured distribution characteristics of breakdown voltage in a 1100 kV gas-insulated switchgear (GIS) disconnector, a dynamic time-slice division and segmented statistical modeling approach is developed to construct a breakdown criterion of "distribution interval bounds + random disturbance." This criterion is embedded into ATP-EMTP to enable efficient simulation of stochastic reignition processes. Experimental results demonstrate that, compared to traditional linear models (Linear Model I and Linear Model II), the proposed method reduces the residual sum of squares (RSS) for VFTO peak prediction from 0.0255 and 0.0517 to 0.0049, and decreases the root mean square error (RMSE) from 0.053 and 0.075 to 0.023. Under full phase angles, the maximum VFTO peak error is significantly reduced from 4.409% and 4.773% to 0.73%, achieving an 86.7% improvement in consistency with measured data. By quantifying the enhancement in simulation accuracy through stochastic modeling, this study reveals the over-conservative design flaws of traditional deterministic models caused by neglecting dispersion, providing a high-confidence simulation tool for insulation optimization in ultra-high voltage equipment.关键词：Very Fast Transient Overvoltage (VFTO);Ultra-High Voltage Gas-Insulated Switchgear (GIS);disconnector;Stochastic Breakdown Voltage;Probabilistic Simulation9|11|0更新时间：2026-08-13
- 摘要：To enhance the detection efficiency and positioning accuracy of high-voltage cable outer sheath grounding fault, and address the limitations of traditional positioning methods that rely on power outage operation, positioning delay and high implementation complexity, a live positioning method based on sheath circulating current characteristics is proposed. Taking single-ended protective grounding and cross-connected grounding as examples, the formation mechanism of sheath current is analyzed theoretically, and the electromagnetic transient model of three-phase single-core cable is built and validated based on PSCAD / EMTDC. By simulating the dynamic process of the outer sheath grounding fault, the distribution characteristics of the sheath current varying with the fault location are analyzed. A polynomial fitting method is employed to establish the sheath current-fault location characteristic equation, which, combined with current inversion at the direct grounding end, enables real-time online fault location. Engineering case studies have verified the feasibility of the proposed method. For single-end grounding systems, fault location can be achieved through single-point current measurement, while cross-connected systems require synchronous current monitoring at both ends to identify fault sections and determine precise locations, without power outage and low operation complexity. The proposed method provides an effective technical reference for on-line detection and rapid location of high-voltage cable outer sheath grounding fault, and has important engineering application value.关键词：high-voltage cable;sheath circulation;grounding fault;characteristic equation;live positioning21|31|0更新时间：2026-07-17
- 摘要：To investigate the correlation between gas generation and capacitive screen micro-discharge in oil-immersed upright current transformers, failure analysis was performed on two out of three 220kV current transformers (same model) that experienced bellows expansion tank cover failures in a regional power grid. The faulty units underwent insulation resistance measurement, dielectric loss tangent (tanδ) and capacitance testing, and dissolved gas analysis (DGA). Results revealed that hydrogen (H2), total hydrocarbon content, and ethylene (C2H4) concentrations in the insulating oil exceeded warning thresholds, accompanied by elevated dielectric loss values. Post-disassembly inspections identified significant wrinkling in the insulation paper surrounding the primary winding and across capacitive screen layers, indicating critical manufacturing defects. Using COMSOL Multiphysics 6.3, finite element models were developed to simulate the primary winding’s external insulation structure, oil-paper interfaces, and wrinkled air gaps. Partial discharge processes under these defect conditions were analyzed, confirming that insulation irregularities and capacitive screen deformation induced localized electric field concentrations. Combined with experimental and dissection findings, the root cause was attributed to progressive micro-discharges at wrinkled regions, exacerbated by degraded oil insulation properties, ultimately leading to gas accumulation and structural failure.关键词：Current Transformer (CT);dissection;Dissolved Gas Analysis (DGA);finite element;Partial Discharge (PD)37|62|0更新时间：2026-07-06
- 摘要：The circuit breaker of the converter station filter group has the characteristics of frequent operation，harsh operating environment，and high failure rate，and its reliability urgently needs to be improved. This article proposes a reliability centered maintenance strategy for filter group circuit breakers. Firstly，the fault characteristics of filter group circuit breakers are analyzed to obtain equipment maintenance project requirements mainly focused on arc extinguishing chamber defects; Secondly，establish an optimization model for the operation and maintenance strategy of the converter station filter group circuit breaker with the lowest equipment operation risk as the optimization objective，and calculate the benefits after adding an arc extinguishing chamber maintenance project; Finally，based on the collected on-site operation data of a specific type of circuit breaker，it is proposed that conducting an internal inspection of the opening and closing of this type of circuit breaker after 205 opening and closing operations has the best efficiency. Based on the research results of this article，a reliability centered optimization method for the maintenance strategy of filter group circuit breakers has been summarized，which has certain reference significance for improving the maintenance strategy of filter group circuit breakers in converter stations in the future.关键词：filter group circuit breaker;maintenance strategy;reliability;optimized model;reliability centered maintenance36|71|0更新时间：2026-05-19
- 摘要：As the core components of circuit breaker, electrical contacts need to have excellent electrical conductivity, mechanical properties and anti-melting properties. CuCr alloys are widely used because of high strength and high conductivity, but there are defects such as brittleness enhancement at high temperatures. By constructing a model of CuCrX (X=C, Si) replacement solid solution with different Cr concentrations, the lattice parameters, thermodynamic stability, elastic constants and electronic structure of the alloys were analyzed using CASTEP software. The results show that C doping significantly affects the lattice constant, the lattice distortion increases with the increase of Cr concentration, and significantly improves the thermodynamic stability, but reduces the modulus of elasticity, enhances the brittleness, and its elastic change is favorable to improve the resistance to fusion welding. Si doping has a weak effect on the lattice and enhances the elastic modulus, CuCr₀.₁₆Si₀.₀₃ has the optimal integrated elastic strength, while enhancing brittleness to improve fusion welding resistance. The electronic structure shows that both C and Si doping enhance the electrical conductivity, and the theoretical electrical conductivity of CuCrC is stronger. In terms of bonding characteristics, CuCrC hybridization plays a significant role, and Si-Cr hybridization in CuCrSi enhances the bonding energy and deformation resistance. This study provides a theoretical basis for the optimization of the properties of CuCr-based contact alloys.关键词：First-principles;C/Si single doping;Thermodynamic stability;Elastic properties;Electronic structure63|63|0更新时间：2026-04-24
- 摘要：Ultrasonic signal measurement is one of the effective on-line detection methods of partial discharge in gas insulated equipment. The optical fiber interferometer sensing system has the advantages of high sensitivity and anti-electromagnetic interference, so it is suitable for partial discharge ultrasonic detection, but it is easily disturbed by environmental noise and affects the signal measurement. In this paper, firstly, the sensing principle of ultrasonic signal of optical fiber interferometer is defined, the phase change of sensing light under the action of ultrasonic signal is quantified, and the cause of phase fading is analyzed, secondly, the methods of high frequency carrier modulation and downconversion demodulation are introduced into the Michelson interferometer topology, which overcomes the influence of environmental noise on the sensing system and realizes the real-time demodulation of ultrasonic signal. Then, an ultrasonic measurement platform is built in the laboratory to verify the accuracy of the down conversion demodulation method. Finally, based on the research system, field testing experiments are carried out on the GIS equipment of a 1000 kV substation, the partial discharge ultrasonic waveforms were successfully captured. The ultrasonic sensing system proposed in this paper offers a sensitive and reliable approach for detecting partial discharge in gas-insulated equipment.关键词：GIS;partial discharge;ultrasonic sensing;optical fiber interferometer;frequency down conversion52|62|0更新时间：2026-04-09
- 摘要：Composite insulators are widely used in power grids due to their excellent insulation performance and mechanical strength. However, the hidden defects such as debonding and delamination caused by the sheath-core interface are the main causes of malignant faults such as broken strings and breakdown. The existing detection methods are difficult to meet the high-sensitivity detection requirements of such defects. In this paper, a diagnosis method of interface defects of composite insulators based on nonlinear ultrasound is proposed. The composite insulator samples without defects, debonding and delamination were taken as the research objects. The nonlinear ultrasonic test platform was built and the ultrasonic echo signals were collected. The discrete Fourier transform-least squares ( DFT-LS ) method was introduced to extract the nonlinear characteristics in frequency domain, and the interface state was characterized by combining the statistical characteristics in time domain. A defect diagnosis model based on Improved Grey Wolf Optimizer-Support Vector Machine ( IGWO-SVM ) is established. The results show that the DFT-LS algorithm significantly reduces the calculation error of relative nonlinear coefficients in high noise environment and effectively improves the robustness of feature extraction. The IGWO-SVM model is superior to GWO and other similar optimization algorithms in terms of convergence speed and recognition accuracy. The model recognition accuracy reaches 96.7 %, which can realize effective detection and intelligent diagnosis of interface defects of composite insulators.关键词：composite insulator;Interface defect;Nonlinear ultrasonics;Improved Grey Wolf Optimizer;support vector machine46|8|0更新时间：2026-04-08
- 摘要：GIS has the advantages of small space and high insulation performance, and is widely used in power grid. However, the movement of free metal particles in its interior will reduce its insulation stability, leaving hidden dangers for the safe and reliable operation of the equipment. Firstly, the motion behavior of free metal particles and the change of take-off voltage under different working conditions are studied. The results show that vibration excitation can broaden the motion range of metal particles and effectively reduce their take-off voltage by 29.8%, and then three typical motion modes of the particles are established. Secondly, pulse current method was used to measure and analyze the discharge characteristics of metal particles under vibration excitation. The results showed that the application of vibration increased the dispersion of PRPD spectra of metal particles to a certain extent, and the maximum discharge of small size and low density metal particles significantly increased, and the maximum discharge of 0.5mm aluminum particles increased by 146%. And after reaching a certain voltage threshold rapidly increase, easy to cause breakdown; The mechanical vibration excitation has little effect on the partial discharge characteristics of heavy particles such as 1mm copper particles. The research results can provide theoretical support for the detection and analysis of free metal particles in GIS active circuit breakers in practical engineering.关键词：GIS;metal particles;mechanical vibration;partial discharge;Motion law;Take-off voltage;pulse current method;discharge characteristic67|52|0更新时间：2026-04-03
- 摘要：On-site testing of gas-insulated switchgear (GIS) is the final safeguard to ensure safe operation after commissioning. At present, AC withstand voltage tests are widely used in engineering practice; however, significant discrepancies exist between the test conditions and the actual “high-voltage–high-current” combined stresses experienced during GIS operation. As a result, multiple cases have been reported in which severe insulation breakdown occurred shortly after the equipment had successfully passed the AC withstand test. To address the limitations of existing test methods, this paper proposes a combined voltage–current on-site test for GIS, aiming to enhance the detection of insulation defects before commissioning and improve the operational reliability of GIS. A technical approach for applying high voltage and large current simultaneously under field conditions is analyzed, and a novel on-site test method based on resonant voltage and induced current combined excitation is proposed, together with a complete testing procedure. Furthermore, an induction-type high-current test device suitable for field application is developed, and the combined voltage–current test is conducted for the first time on an actual GIS during its handover testing. The results indicate that when applying a large induced current to the GIS internal conductor, conductive loops involving the GIS enclosure, enclosure grounding, and substation grounding grid must be avoided. By coordinating two low-power excitation sources, the proposed method can safely and effectively realize combined voltage–current on-site testing, offering a practical solution to improve the authenticity and effectiveness of GIS handover tests.关键词：GIS;On-site testing;Combined voltage-current test;Handover test;partial discharge;Effectiveness;Induction-type current booster70|75|0更新时间：2026-03-24
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