The analysis of the eddy-current field in the wound core widely used in the field of transformer energy conservation is taken as the theme. Adopting the homogenisation idea to consider the unique geometry of the wound core and features of its equivalent multi-stage circular cross-section magnetic boundary, a homogeneous model consisting of a columnar material with continuous homogeneous electromagnetic

Low temperature plasma stands at the forefront of green and clean energy technologies, showcasing remarkable versatility across a wide array of applications including material processing, water splitting, methane conversion, and plasma medicine. To fully harness the potential of this technology, it is imperative to deepen our understanding of the physics underlying various discharge structures. This

Because DC conductivities of oil-paper materials can be easily affected by electric field and temperature, the electrical properties under electro-thermal coupling of oil-paper materials should be considered when optimising the insulation structure of valve-side winding of the converter transformer. Based on the finite element multi-physical field coupling simulation, the multi-objective optimisation

The micro-defects in epoxy-based insulation materials generate a local high electric field which results in continuous degradation, seriously endangering the insulation system of gas-insulated switchgears. A highly sensitive detection technique is reported for micro-defects of insulation pull rods based on the photon counting (PC) technique. The results demonstrated that for an epoxy-based insulation

The unsatisfactory insulating properties of solid–gas interfaces seriously restrict the development of high-voltage electrical equipment and threaten their power supply stability. Electron-beam irradiation (EBI) can effectively improve the surface flashover voltage of dielectrics. However, the underlying mechanism of EBI in tailoring the surface trap and improving the flashover voltage remains unclear

The moisture generated by the ageing of the oil-paper insulating system can easily lead to the deterioration of the performance of the insulating paper. In order to alleviate the impact of moisture on the performance of the insulating paper,?we developed a kind of lipophilic hydrophobic self-repairing cellulose insulating paper (new insulating paper) based on the ternary system of polytetrafluoroethylene

Dielectric barrier discharges (DBD) are widely utilised non-equilibrium atmospheric pressure plasmas with a diverse range of applications, such as material processing, surface treatment, light sources, pollution control, and medicine. Over the course of several decades, extensive research has been dedicated to the generation of homogeneous DBD (H-DBD), focussing on understanding the transition from

Due to the increasing power system capacity, the interruption of large fault currents has gradually become a major challenge in power systems. At the moment, such currents are interrupted mainly via circuit breakers based on the method of active current commutation. However, these types of circuit breakers tend to be costly and oversized. One possible alternative—a fuse-based circuit breaker with current

The step-up resonant converters are widely adopted to provide high voltage in kV-level for electric propulsion system due to their high efficiency, low mass, modularisation, and high-power density. The bipolar Cockcroft-Walton voltage multiplier (BiCWVM) is a major circuit that steps up the voltage in the resonant converter. However, the diode non-linearity in BiCWVM can introduce self-sustained quasi-periodic

A wireless signal transmission technology based on acoustic carrier is proposed, which overcomes the limitation of electromagnetic signal shielding and shows great potential for in-site monitoring of sliding electrical contact used in gas-insulated switchgear (GIS)/gas-insulated transmission line (GIL). Here, the state parameter of the sliding electrical contact is modulated onto the frequency domain

Hydrogen generated by water electrolysis is considered as one of the most promising protocols to partly replace the roles of traditional fossil fuels. However, high-performance electrocatalyst satisfied with the industrial requirement still faces significant challenges. Low-temperature plasma contains numerous high-energy ions, electrons and other reactive species, which can provide a highly reactive

Bisphenol F epoxy resin (EP) is often used in terminal current lead insulation of superconducting equipment because of its good insulation performance, high mechanical strength, good toughness at cryogenic temperatures, and resistance to cold shock and heat shock. However, due to the wide temperature range of 80–300?K and the strong electric field, the EP-N2 interface is prone to surface flashover

The inspection of the transmission lines is of great significance for the safe and stable transportation of electric power. However, the small-sized and easily confused objects of transmission lines are always difficult to detect accurately. In this article, a new network based on the combination of the cross-domain interactive (CDI) enhanced pyramid network and the knowledge graph relational reasoning

In recent years, many accidents occurred worldwide owing to Buchholz relay maloperation and failure to act in time, which significantly compromised the security of power systems. To address this problem, an experiment based on a 25 MVA/110 kV oil-immersed power transformer setup was performed to characterize the response of a Buchholz relay; gas-generation faults of different severity inside the transformer's

Integration of wind farms into the power system could potentially lead to wideband oscillations (WBOs), threatening the stability of power system. Due to the high dimensionality of large-scale wind farms, the equivalent model should be constructed to facilitate the analysis of WBOs. This article proposes a data-driven time-frequency-domain equivalent modeling method of wind farms. The equivalent model

Icing on transmission lines greatly threatens the operation and security of power systems. In this study, a novel durable anti-icing aluminum (Al) conductor is first proposed for its robust anti-icing properties and improved electrical performance. The novel Al conductor with optimized nanopores structure fabricated by anodization presented excellent superhydrophobicity with a contact angle of 176

To improve the measurement accuracy of high-frequency traveling wave signals, eliminate the measurement errors of the existing measuring device caused by its complex distribution parameters, an induction fault traveling wave measurement method based on tunnel magnetoresistance (TMR) is proposed. A new type of induction current traveling wave sensor is designed and developed in this study. The influence

Accurately locating the fault helps in the rapid restoration of the isolated line back into the system. This article proposes a novel communication-based multi-terminal method to locate the fault in a radial medium voltage DC (MVDC) microgrid. A time-domain based algorithm is proposed which applies to an MVDC system with different possible combinations of lines and cables. Terminal measurements of

The lifetime model of turn-to-turn insulation in inverter-fed motors is studied. A lifetime model has been built by considering the effect of inverter-generated high voltage rise rate (dv/dt up to 20?V/ns). This model is followed by the generalised probabilistic model, in which the lifetime is proportional to the nth power of the voltage rise rate. Moreover, by investigating the effect of voltage rise

Trace hydrogen sulphide (H2S) could reflect the severity of insulation faults in gas-insulated switchgear (GIS), therefore, accurate and fast detection of low-concentration H2S is important for on-line monitoring, fault diagnosis, and state evaluation in GIS. Ag-Ti3C2Tx chemiresistive-type sensors were fabricated via drop-coating with self-reduction synthesised Ag-doped Ti3C2Tx. The as-prepared sensors

Resonance mode analysis (RMA) is a promising approach for harmonic power quality and stability studies because it enables the characterization of resonances. However, RMA requires the determination of the eigenpair decomposition of the nodal admittance matrix over the frequency scan, which is a high time-consuming task. Alternative RMA based on the power iteration (PI) method reduces this computational

A methodology to determine and preserve Existence of Equilibrium Point (EoEP) is proposed for a power grid dominated by Renewable Energy Sources (RESs). Starting from phasor-domain circuit analysis, a sufficient criterion of assessment in determining EoEP is derived with the theorem of implicit function and analytic continuation. As an outcome of assessment, an indicator, namely the Generalized Short

This article discusses the usage of electric vehicles (EVs) to enable vehicle-to-grid (V2G) in DC charging stations. The V2G-enabled DC charging station is equipped with bidirectional DC/DC converters for both DC chargers and the energy storage system (ESS) and a three-phase two-level AC/DC voltage source converter for connecting to the low-voltage grid. A proposed controller with a state-of-charge

The local nonlinear loads impact performance of a microgrid (MG), as they degrade the system power quality (PQ). This degradation is more in a diesel generator (DG) based standalone MG than grid-connected MG. Therefore, this article introduces an enhanced adaptive multilayer complex coefficient filter (EAMCCF) control for PQ enhancement of a MG comprising a solar photovoltaic (SPV) array, battery energy

This issue of IEEE Vehicular Technology Magazine includes 10 open-call articles addressing nonterrestrial networks (NTNs), artificial intelligence/machine learning (AI/ML) for millimeter-wave (mm-wave) wireless communications, the convergence of the metaverse and mobility systems, free-space optical (FSO) vehicle-to-everything (V2X) communications, maneuver coordination for cooperative driving and

This time of year is special for the IEEE Vehicular Technology Society (VTS). We will recognize this year’s VTS Award recipients at the 98th Annual IEEE Vehicular Technology Conference held in Hong Kong (VTC2023-Fall). We will also bring together engineers, researchers, and other professionals at the 2023 IEEE Vehicle Power and Propulsion Conference (VPPC) to be held in Milan, Italy. I hope we will

As the world anticipates the arrival of 6G networks, the spotlight is increasingly turning toward innovative technologies that can push the boundaries of wireless connectivity even further. Among these transformative technologies, Reconfigurable Intelligent Surfaces (RIS) have emerged as a promising solution that holds immense potential to revolutionize wireless communication in the 6G era.

Reports on public rail transportation projects that are being developed and launched around the world.

Research on the next generation of cellular technology, called 6G , is ramping up rapidly all over the world. Now is the time to influence what should be in and what should be out under the 6G umbrella. The European Union (EU) has earmarked €900 million (～US$974 million) for research and innovation for 6G spread over seven years (2021–2028), and the EU is expecting the industry to invest the same amount

The cyber-physical deep coupling exacerbates the challenge of restoring the load power supply of the distribution network (DN) after a power outage. Serving as interface devices between the DN and the traffic network (TN), mobile energy storage systems (MESSs) play a crucial role in load recovery. To enhance the emergency response, a multi-period dynamic power supply restoration strategy for DN is

This work introduces a comprehensive hydrogen electrolyzer (HE) load modelling framework suitable for general steady-state power system studies such as power flow and optimal power flow. The proposed model captures all relevant nonlinear physical features and operational constraints of the electrolysis stack and downstream hydrogen (H 2 ) system. More specifically, the modelling includes HE active

Ensuring power transmission line reliability is crucial for power system stability. Mechanical joints, critical components of transmission lines, are susceptible to pin defects, leading to severe consequences. We propose an end-to-end lightweight defect detection method, Cross-Scale Spatial Attention Detector (CSSAdet), for accurately identifying pin defects in mechanical joints. CSSAdet integrates

A damping-controllable-commutated converter (DCCC) is proposed to enhance the commutation failure (CF) mitigation capability of line-commutated converter-based high-voltage direct current (LCC-HVDC) systems. The DCCC comprises a main branch and an auxiliary branch, with the main branch consisting of thyristors and a few high-current capacity integrated gate-commutated thyristors ( i -IGCTs) and the

High-voltage circuit breakers (HVCBs) are important components for reliable operation of power systems. Due to irreversible degradation, effective estimation of the aging-dependent failure rates of HVCBs is crucial for fit-for-purpose maintenance strategies. Many data-intensive models previously proposed for the aging-dependent failure rate evaluation cannot be extended to CBs without sufficient aging-related

The diode rectifier- modular multilevel converter (DR-MMC) based hybrid HVDC system is an attractive topology for integrating large-scale offshore wind power. To investigate the interaction stability of the cascaded DR-MMC converter integrating with offshore wind farms, this article proposes the sequence impedance model considering frequency coupling among DR, MMC, controllers and DR commutation process

With the increasing proportion of renewable energy sources in modern power systems, the power flow problem has become more prominent. The traditional phase shift transformer (PST) has the advantages of simple structure, high reliability, and low cost. However, PST can only regulate the active power flow of the line by controlling the phase shift angle, and cannot independently regulate the voltage

Ice monitoring methods were applied for 110?kV and above transmission lines with tangent towers. However, the change in the vertical span is not considered, and a significant difference lies in the tower-conductor structure of 10?kV transmission lines. For this reason, a proposal is made about the ice monitoring method for the 10?kV transmission line with tangent tower in alpine landform, which includes

The laboratory lightning test is essential for assessing the effectiveness of lightning strike protection (LSP). Particularly, direct lightning strike damage can be performed with pulsed current injection into the specimen. This paper focuses on the dynamic process of arc plasma and shock wave behaviour in the vicinity of the ‘strike’ point. A rod-plate discharge load is built for testing aluminium

As voltage measuring devices are widely used in the high voltage power system with a primary-secondary-fusion structure, electronic voltage transformers are directly connected to the primary conductor and would face much more serious electromagnetic environments than general secondary equipment. As a result, they would still experience failures even when general protection measures are adopted to suppress

The Gatchina discharge phenomenon holds significant promise as a laboratory model for simulating ball lightning. However, crucial aspects concerning the plasma components of the resulting afterglow remain unresolved. Notably, the measurement of the electron density, a critical parameter, has not been fully achieved thus far. In this study, microwave diagnostics and video recording were employed during

Ester liquids (ELs), as the alternative transformer liquids to the conventional mineral oils (MOs), have been increasingly used in power transformers with high voltage ratings. Among various properties, the lightning impulse breakdown voltages (LIBDVs) have been studied elaborately in the past 2?decades under different electric field uniformities. The electric field uniformities do have an effect on

Accurate assessment of hot-spot temperature is essential for the safe operation of power transformers. Existing dynamic thermal models cannot estimate hot-spot temperature accurately since some input parameters are roughly determined by transformer capacity and cooling mode while ignoring the effect of winding structure, tank dimensions, and material physical properties. To improve the accuracy of

Rubber-based composites based on ethylene propylene diene monomer (EPDM) with excellent non-linear electrical conductivity are preferred to serve as reinforced insulation in cable accessories, which can self-adaptively regulate electric field distribution and avoid electric field concentration due to the non-linear conductivity. The conductive carbon nanotubes (CNT) are filled into EPDM to improve

Diagnosis and location of partial discharge (PD) are the basis for ensuring the reliable operation of gas-insulated switchgear (GIS). Current PD diagnosis and localization are implemented as two separate tasks and the connection between them is ignored, which is challenging and time-consuming for improving the performance of the model. To address this issue, we propose a dual-task network (DTN) to

Basin-type insulator often has small cracks due to stress concentration. The current method cannot accurately reflect the stress condition of the insulator to find the stress concentration areas. To solve these problems, a method for detecting two-dimensional plane stress (δ1 and δ2) within different depth ranges in a basin-type insulator is proposed based on critically refracted longitudinal (LCR)

Vibration with a frequency of 100?Hz is widely distributed in the power equipment, and it can provide a new way to supply energy for sensors by vibration energy harvesting. The vibration energy harvesting method based on electromagnetic induction principle was studied through the arrayed structure of magnets and coils. Static magnetic field models were established for four magnet array structures and

Due to inefficiency and insecurity of manual insulator inspection, research on intelligent insulator inspection has received widespread attention. Previous deep learning-based defect detection methods rely excessively on Big Data training. However, in reality, defective insulator samples are too scarce to meet the training requirements of traditional neural networks. To overcome this problem, this

In this article, an offshore DC distributed power-collecting and cascaded voltage-boosting (DPCB) system with distributed energy management system (DEMS) is presented for DC energy collection and DC-voltage boosting, which is differ from conventional centralized power-collecting and cascaded voltage-boosting structure applied in HVDC station. And the whole system includes multiple cascaded single active

Line-Commutated Converter (LCC) based High-Voltage Direct Current (HVDC) systems are susceptible to commutation failure (CF) during fault recovery not only for faults at inverter, but also for faults at rectifier side. Although the mechanism of CF under each scenario (fault at inverter and fault at rectifier) have been widely discussed, no existing methods can mitigate CFs under both scenarios. This

Computational screening of single gases to replace SF6 for electrical insulation has been challenged by the difficulty in combining various mutually exclusive properties especially for dielectric performance with liquefaction and environmental properties. To reveal the inherent correlations between dielectric strength (Er), boiling point (Tb), and global warming potential (GWP) of dielectric materials

Accurate assessment of Remaining Useful Lifetime (RUL) of power transformers plays an essential role in improving the reliability of power grid while reducing operating costs. A dynamical RUL prediction technique is proposed in this article through analyzing the individual difference by multi-dimensional fusion of condition monitoring data. Firstly, the on-site Dissolved Gas Analysis (DGA) measurements

Oil-paper insulation material is an essential component for oil-filled transformers, and polyimide (PI) insulation paper is a novel material in the field of electricity. The improvement of insulation class for insulation paper has gained significant attention in recent years. In this study, SiO2 nanoparticles were modified with a silane coupling agent (KH550), and the KH550-SiO2 was added to the fibre

Silicone elastomers are widely used to encapsulate power electronic devices. However, such devices may be subjected to square-wave pulsed voltages with a high rate of change, which can create significant challenges for encapsulation insulation. In this article, the molecular vibration of silicon elastomer at the edge of pulsed electric field is studied. Firstly, the relationship between the intensity

Bretelle dampers are made of slack conductor pieces that are used to mitigate aeolian vibration amplitudes. Under cyclic and dynamic excitation, inter-strand friction in slack conductors causes a significant flexural hysteresis leading to the dissipation of high amounts of energies. The objective of this work is to study the flexural hysteresis of three types of slack conductors based on quasi-static

The fault ride through (FRT) ability of the photovoltaic (PV) DC distribution system (PV-DCDS) is required during an AC system fault. However, due to the inherent calculation delay of grid connected converter (GCC), overcurrent may appear instantly in the fault initial stage (before the controller responding) and might trigger the GCC's instantaneous overcurrent protection, causing the failure of FRT

To reveal the interaction between AC and DC voltage and current of line commutated converter (LCC) based HVDC, a detailed model of LCC in abc frame is developed in this article to capture the nonlinear characteristics using switching functions. Using Fourier transforming, the switching functions are then decomposed into different harmonic components, which significantly reduces the difficulties associated

The rotor winding of variable speed pumped storage generator-motor (VSPSGM) is a special three-phase winding structure, which not only makes the traditional rotor ground fault location method no longer applicable, but also increases the faulty phase selection problem. Therefore, the faulty phase selection and location method of rotor ground fault for VSPSGM is proposed in this article. Firstly, the

Determination of parasitic capacitances is a necessary step in the design process of transformers to be used in power electronic devices. At high switching frequencies, these capacitances together with inductive elements of the circuit cause unwanted oscillations during fast transients such as sharp fronts of square voltage waves appearing in a dual active bridge converter. In the article, parasitic

In bulk power systems, detecting the sources of low-frequency oscillations can be challenging. The energy-based approaches for oscillation source localization are known to have better accuracy compared to others. The dissipating energy flow (DEF) method is one such approach with notable success in localizing real-world oscillation cases. While the mathematical justifications for the method's characterization

A key factor limiting the development of silicone rubber insulating materials is their short service life in harsh operating environments. The establishment of a self-healing system is desired to improve the long-term operational performance of silicone rubber and effectively extend its service life. In this study, poly(urea-formaldehyde) microcapsules containing polydimethylsiloxane healing agents