Abstract The emergence of perovskite semiconductors for field‐effect transistor (FET) applications has received significant research attention due to their excellent electronic properties. rapid development FETs over the last few years been driven by advances in understanding thin‐film morphologies layers and intriguing correlations with charge carrier transport, device performance, stability. Here we summarize progress morphological engineering aimed at improving electrical parameters FETs....

Extra high-voltage converter transformer resin impregnated paper (RIP) bushing is used as the outlet device of transformer, its safe operation directly related to reliability power system. Under long-term effects high current, strong mechanical stress and abrasion, contact resistance connection structure inside prone deteriorate. When local overheating increases a certain level, insulation performance will decline may lead penetrating discharge. Therefore, it vital develop strategies for...

As the transmission capacity of gas insulated line (GIL) increases, synergistic improvement in dielectric and mechanical strengths GIL insulators is urgently needed for development advanced power systems. Mechanical defects equipment are prone to induce discharges during high voltage operations, which need be mitigated. In this paper, strains on insulator surface measured by fiber Bragg grating (FBG) strain sensors hydrostatic tests. An abnormal change detected near interface between center...

Metal particle contamination can seriously affect the reliability of gas-insulated metal enclose transmission line (GIL) and cause insulation failure. In this article, we investigate motion patterns based on entity model GIL by using finite element simulation. Analysis characteristics particles at different locations is presented charged mechanism dynamic equation. The impacts attributes, applied voltage, shielding electrode are studied. It found that under ac concave convex sides basically...

Gas-filled internal crack might appear in thermoset materials like epoxy resin during the equipment manufacturing, which would become a vulnerable local region to initiate electrical tree, thus prone cause insulation failure. The withstand voltage test was carried on samples with artificial cracks based rod-plane electrode arrangement. Simultaneously, surface state variation and tree evolution were observed by an optical microscope conjunction charge-coupled device camera. changes morphology...

Whether the metal particles in dc GIL/GIS can be effectively captured by particle traps affects its safety and stability operation. In this article, a test platform simulation of real structure is set up to study influence law trap on capture rate. The effect key parameters shielding balls rate up-lift studied, surface coating strategy proposed improve trapping efficiency trap. results show that increasing length height particle, while too-large or too-small grid not conducive capture. With...

Abstract The direct current gas insulated transmission line (DC GIL) technique has emerged as a promising solution to achieve carbon neutrality and enable efficient long-distance of renewable energy. However, the stable long-term operation DC GIL insulators poses significant challenge that requires insulating materials capable overcoming charge accumulation issues against multi-fields, including electric, temperature, force. Here, we investigate space dynamics electrical conductivity epoxy...

Potential defects in oil impregnated paper (OIP) bushing during manufacturing or transportation may further deteriorate and develop under long-term operation, affecting the insulation, leading to transformer damage power outage. In this article, scaled models were designed produced according 550kV OIP bushing, typical defects, including plate wrinkle defect, deviation moisture end shield ungrounded set models. Based on a high-voltage experiment platform, 45-day simulated operation was...

In GIS disconnector, the pull rod acts as an insulating support for connecting current-carrying conductor and shell. It bears large voltage strong machinery a long time. During assembly live operation, may be damaged, various defects appear inside outside rod, which affects stable operation of GIS. order to study defects' influence on insulation performance three-dimensional model disconnector was established in this paper. The electric field distribution isolating switch under normal...

Gas insulated metal enclosed transmission line (GIL) is widely used in power because of its prefect security and reliability. Tir-post insulator one the most important component GIL which supports insulation structure. However, defects tri-post will distort electric field distribution, weakened insulation, even cause failure. The safety be threatened by defects. So it necessary to analyze effect law electrical distribution defects, focus on severe place need avoid production process. In this...

Transformer resin impregnated paper(RIP) bushing has been widely applied in power transmission system as a vital part of transformer. The performance is important to the reliability level and stability system. However, voltage increases, heating problem paper increasingly serious. In this paper, 3-D electromagnetic-fluid-thermal method was proposed by applying computational fluid dynamics(CFD) analysis. influence thermal conduction, radiation convection heat transfer were taken into account...

Gas insulated metal enclosed line (GIL) has a lot of advantages on electromagnetic environment, current capacity and stability. As for the unique characteristic GIL, mature products GIL are more preferable to high voltage transmission field in some situations. With level increasing, insulation designs have challenges difficulties. The world's first 1100 kV been building China from Suzhou Nantong. In order ensure safety stability this projects, improve reliability electrical insulted system,...

For a fast changing excitation like lightning impulse voltage which is applied to zinc oxide arrester, its waveform in frequency domain contains many different harmonic components and response the sum of each component. Nevertheless, existing simulation analysis electric power equipment's withstand performance almost doesn't consider effects some materials, varistors, whose permittivity vary with frequency. Moreover, IEC, test arrester's polymeric house without varistors or transformer oil...

Good electrical contact status is an important guarantee for the stable operation of gas insulated line (GIL). Contact resistance and temperature in interface are key parameters which can characterize condition current-carrying system GIL. Generally, conductor metal liner cast with insulator connected by spring contact. The degradation cause severe rise near insulator, will reduce insulation mechanical properties discharge accidents. In this paper, firstly, design demand connecting structure...

UHV AC GIS Basin type insulator is the key component of gas insulated substation (GIS). The stability and reliability operation determines insulation strength level GIS. However, because characteristic switchgear in GIS, very fast transient overvoltage (VFTO) occurs with high frequency, amplitude gradient, which will threaten safety insulation. In past time, electric field distribution VFTO was calculated by traditional method used peak voltage as boundary condition. this paper, a have...

As a vital component of converter transformers, resin impregnated paper (RIP) bushings withstand high voltage and loading current for the long time operation, which makes temperature distribution become one key issue to characterize its status. However, monitoring RIP bushing used be based on infrared observation in past, internal field is difficult analyze evaluate real-time. Therefore, this proposes deep learning surrogate model (DLSM) quickly accurately predict bushing. DLSM consists two...

It is important to solve the problem of metal particle pollution inside DC GIL. Using numerical simulation calculate trajectory particles an method designing traps and drive electrodes. In this paper, a 3D dynamic motion randomly based on quadratic Rodrigues' rotation proposed GIL, considering random reflection. Based model, influence characteristics reflection angle, gravity inclination, size other factors are analyzed. From results, trapping efficiency becomes weaker under effect gravity,...