Abstract
For years there have been countless efforts to find an environmental-friendly gas or gas mixtures to minimize SF6. Researchers have been ongoing to find its alternatives where there are few gasses used to minimize SF6, such as carbon dioxide (CO2) and air. This paper aimed to study the effects of field uniformity towards breakdown characteristic of air-CO2 gas mixtures under AC and DC voltage. Two types of electrodes were used in this experiment which are sphere-sphere electrode (D=5cm) and the rod-rod electrode. Other than that, there are five level of gap distances (0.5cm-2.5cm) with three mixing ratios (100% air–0% CO2, 70% air–30% CO2, 50% air-50% CO2) in 2 bar (abs). The results show the breakdown voltage (U50) of the sphere-sphere electrode is higher than the rod-rod electrode under AC and DC voltage. Besides, as the U50 goes higher, the Emax will be decreasing in any mixing ratio under AC and DC voltage. As for the results, the sphere-sphere electrode is more uniform field than the rod-rod electrode. Moreover, the sphere-sphere electrode has shown the highest withstand capacity of breakdown since they have provided less stress to the field gaps.
Highlights
People were concerned about the environmental impact to the world as the result of human activities
SF6 is considered as a greenhouse gas even though it has been extensively applied in large capacity electric power equipment such as gas-insulated switchgear (GIS) and gas circuit breakers (GCB)
This paper aims to investigate the performance of the breakdown voltage (U50) and the electric field of CO2 and air in view to minimize SF6 gas as an insulator in high voltage equipment
Summary
People were concerned about the environmental impact to the world as the result of human activities. SF6 is regarded as the best gas insulation for high voltage application, air is still widely used to ease maintenance of property. Hideto Mashidori examined the sparkover characteristics of air-CO2 mixed gases In his journal, when CO2 concentration increased from 0% to 2%, the sparkover voltage decreased around 20 kV under a positive DC voltage [10]. This paper aims to investigate the performance of the breakdown voltage (U50) and the electric field of CO2 and air in view to minimize SF6 gas as an insulator in high voltage equipment. These gasses will be mixed with three types of mixing ratios and pressure is fixed at 2 bar (abs). Perhaps a gas-insulated transmission line (GIL) with CO2 gas mixtures will be able to replace HVDC cable [14] and solve magnetic field problems in overhead transmission lines [15]
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