The complex structure of gas-insulated switchgear (GIS) cable terminals leads to serious electric field concentration, which is a frequent fault position high-voltage system. At present, due the differences in frequency bands sensors, various partial discharge detection technologies have certain their scope application and anti-interference performance, resulting low defect rate GIS terminals. ...

The design of high-voltage (HV) systems is principally dependent on the discharge voltage their insulation. Sphere geometry and semispheroid are extremely important in HV systems, such as ground rods gas-insulated substations (GISs). Hence, this work, a machine learning algorithm proposed to develop model predict characteristics air for sphere geometries. Finite element method (FEM) simulations...

Latent insulation defects introduced in manufacturing process of gas-insulated switchgears can lead to partial discharge during long-time operation, even to insulation fault if partial discharge develops further. Monitoring of decomposed components of SF₆, insulating medium of gas-insulated switchgear, is a feasible method of early-warning to avoid the occurrence of sudden fault. Polyaniline th...

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...

OVERVIEW: Hitachi has developed smaller and more reliable gas-insulated switchgear (GIS) in response to demands for lower costs and stable power supplies. Reliability of this GIS was improved and the enclosure diameter was reduced in order to minimize the installation space by using new analysis techniques and rationalization in insulation design and in temperature rise criteria. Furthermore, t...

Chemical by product diagnostic technique is an efficient, cost-effective and reliable diagnostic technique for gas insulate switchgear condition monitoring in view of its high sensitivity and antiinternal and external electromagnetic interference and noise. In this research paper, coaxial simulated gas insulated switchgear chamber and four different types of artificial defect were designed to c...