Abstract As an important part of the substation, seismic capacity ultra-high voltage (UHV) electrical equipment is related to safe and stable operation substation whole power grid. The UHV gas-insulated transmission lines (GIL) have many structural characteristics, such as long pipeline distance, large span between supports obvious amplification effect supports. Its natural frequency close pred...

The temperature distribution of the tri-post insulator in a ±500 kV direct current gas-insulated transmission lines (DC-GIL) is investigated. influence thermal gradient on electric field characteristics investigated as well. A horizontally installed GIL model applied simulation. and parameters are measured employed. results indicate that gas shows layered pattern while radial pattern. upper pos...

The acoustic emission (AE) is a group of phenomena involving generation of transient elastic (acoustic or vibro-acoustic) waves, resulting from liberation of intermolecular bond energy (deformation, cracking, phase transitions). This fact contributed to elaboration of the acoustic emission method, which is widely used in: (i) diagnostics of cutting tools and machine cutting process, (ii) machin...

The interpretation of the surface charge pattern spacers in gas-insulated transmission lines (GIL) is an interesting and important research topic, which requires a comprehensive understanding behaviors at physical interfaces. Here, we report charging phenomenon presence metal particles inside direct current (DC) GIL. spherical particle on spacer appears as dotted discontinuously distributed spo...

In this paper, an improved finite element (FE) model is proposed to investigate the temperature distribution in gas insulated transmission lines (GILs). The solution of joule losses in eddy current field analysis is indirectly coupled into fluid and thermal fields. As is different from the traditional methods, the surrounding air of the GIL is involved in the model to avoid constant convective ...

Transient voltage generated in ultra-high (UHV) transmission system has a severe impact on the insulation state of gas-insulated lines (GIL). In order to monitor transient process occurring UHV GIL during operation, this paper constructs ultra-wideband (UWB) online monitoring based capacitive division. This been applied an 1100 kilovolt (kV) utility tunnel project. It can be used analyze charac...

Abstract The simulation models of the 500kV gas-insulated transmission lines (GIL) and substation (GIS) systems in a realistic nuclear plant are presented paper. Very Fast Transient Overvoltage (VFTO) which is generated during switching operations, analyzed. Some affecting factors on level VFTO investigated. These location power source, entrance capacitance potential transformer (PT), capacitiv...

SF6 is a gas with excellent dielectric properties and is commonly used in gas-insulated equipment. However it has the high global warming potential. Thus, the development of new gases or gas mixtures for GIS, GIL is strongly desired. For dimensioning the gas insulated systems the support insulators (spacers) are of special interest. Contaminations on the insulator surface can cause field distor...

Accidents always occur in gas-insulated switchgears (GIS) and lines (GIL) since filmed joint electrodes are produced when internal gases react with the electrode’s surface there is a discharge or electricals overheat. To solve problem, this paper analyzed evolution of elements on contact electrode. The reaction SF6 under breakdown currents overheating conditions was obtained, time current effec...

Gas insulated transmission lines (GIL) have a wide application prospect in special occasions such as cross terrain power transmission. Metal particle pollution is an important reason for the low insulation performance of GIL. When micron metal particles (MMPs), which are most common engineering, adhere to insulators or high-voltage electrodes, will be reduced. Based on that, this paper mainly s...