The growing environmental challenge of electrical energy systems has prompted a substantial increase in renewable energy generation. Such generation systems allow for significant reduction of CO2 emissions compared with a traditional fossil fuel plant. Furthermore, several improvements in power systems network configuration and operation combined with new technologies have enabled reduction of ...

A recent investigation explored a new measuring concept used in partial discharges (PD) measurements gas insulated substations (GIS), consisting of magnetic loop antenna. The sensor’s frequency response was characterized up to some tens MHz. This paper proposes an improved version the sensor with extended bandwidth (BW) one order magnitude higher: resonance, attributed common mode current mount...

In recent years, gas-insulated switchgear (GIS) substations have become widely used in power systems. Due to their compact structure, extremely high oscillation frequencies are prone transient overvoltages or very fast (VFTOs) when the isolating switch circuit breaker is operated. The characteristics of these special processes GIS and effect hybrid reactive compensation (HRPC) on were studied. ...

Power substations in an urban area are interconnected by high voltage underground power cables, resulting also in interconnections of their earthing grids through cable metallic screens/sheaths. Most modern power cables with XLPE insulated core have metallic screens which are practically insulated from ground. These screens can only be (and usually are) grounded at cable ends and therefore do n...

Gas insulated switchgear (GIS) plays a vital role in high voltage transmission of electrical energy due to its advantages of high reliability and performance, compact in dimensions and outstanding compatibility with the environment. It uses sulphur hexafluoride gas as its insulant and coolant because of its high dielectric strength and excellent arc quenching ability. Gas insulated switchgear i...

Abstract: In recent years, SF6 gas insulated switchgear (GIS) has become more widespread in electrical power substations and GIS rated from 66 to 1100kV are working successfully. The GIS is used in closed vessels, isolated from the atmosphere. This gives it intrinsically high insulation reliability because there is no contact with dirt or contaminates. To assure even better reliability, measure...

Air is the most commonly used insulation gas in high voltage applications: Mostly ambient air for overhead power lines and air insulated substations, but also synthetic air in medium voltage metalenclosed switchgear at slightly elevated pressures. Moreover, nitrogen and air have been proposed as suitable alternatives to SF6 in high-voltage insulation and interruption applications of gas insulat...

A time-difference-of-arrival-based partial discharge (PD) location system that utilises prior knowledge of substation layout is presented. We propose a new time delay estimator employs onset detection techniques and demonstrate, through experimental results, it at least 2.8 times more accurate than other conventional estimators. Using substation’s layout, we develop minimum mean-square-error (M...