Applied Science and Engineering Journal for Advanced Research

Study on Effect of Metallic Particle Contamination on the Break Down Voltage in Air Insulated System

Sreenath K, B. Rajesh Kamath — Mon, 24 Jul 2023 00:00:00 +0000

The development of compressed gas insulated switchgear (GIS) and gas insulated transmission line (GITL) have progressed rapidly worldwide because of the excellent insulating and arc quenching properties of Sulphur Hexa Fluoride (SF6) gas. However, free conducting particles lower the corona onset and breakdown voltage of these systems. Under the action of the applied electric field in a coaxial geometry, conducting particles acquire charge and lift off from the outer enclosure when the electrostatic force from the electric field becomes equal or larger than the force due to gravity. Metallic particles move randomly in gas insulated systems under the action of electric field. The particle may remain in mid-gap or stay around the central conductor for several voltage cycles. Particle movement therefore plays a crucial role in determining the voltages withstand capability of GIS/GITL systems.
Metallic conductors in gas insulated system are protected with a dielectric covering to mitigate the problem of particle initiated breakdown. Dielectric covering reduces the effect of surface roughness of conductors/duct and also increases the dielectric strength of the insulation system. Several researchers have developed computational models for particle movement in co-axial electrode system. These models however make assumptions about the particle charging process and charge exchange mechanism when a moving particle returns to the dielectric coated enclosure. Many experimental techniques have been proposed by researchers to explain the movement of particles in a co-axial bus-duct system. The experimental observations are also compared with the computational model. However, particle contamination in GIS is not fully understood and explained satisfactorily. Though SF6 is accepted universally as the best gaseous dielectric, it is considered to be a Greenhouse Gas. Hence research worldwide focuses on alternatives to SF6 gas without making much compromise on dielectric and other properties. In this context, use of SF6-N2 gas mixtures, containing less than 10% of SF6 gas is seen as a viable alternative for GITL. Hence the present study was taken up with this motivation.

A Review of the Bioaerosols in the Air-Conditioners Building

Nur Baitul Izati Rasli, Nor Azam Ramli — Tue, 25 Jul 2023 00:00:00 +0000

Bioaerosol is one of the sources that influence poor indoor air quality. Most buildings have air-conditioners (A.C.) to cool down the indoor building. However, the microorganism tends to grow, especially on the air conditioner filter, which may cause health problems called sick building syndrome and other bacterial diseases. Besides, temperature variation, relative humidity, and human occupancy in the A.C. building can also influence bioaerosol growth. Staphylococcus and Micrococcus were the most dominant genera detected in the A.C. building worldwide. Therefore, A.C. buildings need periodic services to avoid the spread of bioaerosol growth as it leads to adverse indoor air quality and to maintain human health.

Data Clustering and Techniques with Weights Over Data Stream

Abhishek Verma — Thu, 27 Jul 2023 00:00:00 +0000

Data mining refers to extract and identify useful information from large sets of data. This term is really a misnomer. Thus, data mining should be named as knowledge mining which rely stress on mining from vast sets of data . An enormous quantity of data is present in the information industry. This data is meaningless until it is converted into useful form of information or help the industries in their business. It is essential to analyze this plenty of data and extract the valuable information from it. In data mining, extraction of information is not only the process to be performed it also involves various other process such as cleaning, integration, data transformation, data mining, pattern evaluation and presentation. When all these processes are completed one will be able to use this valuable information in many applications such as Fraud Detection, Market Analysis, Production Control, Science Exploration, etc.(Dhaka et al.,2018)

This paper introduces the significance use of data mining techniques such as clustering, association-rules, sequential pattern, statistics analysis, characteristics rules and so on can be used to find out the useful knowledge. Finally, various tools has been explained in this paper.

Development of Concrete using a Pull Out Test

Shridhar Sangave, Vittahal Rao — Fri, 28 Jul 2023 00:00:00 +0000

In civil engineering, fiber reinforced polymer (FRP) bars are commonly employed. As an alternative to reinforcement steel due to their numerous advantages, including great weight-to-strength ratio, light weight, ease of handling electromagnetic neutrality, and lack of rust. Furthermore, as production machinery develops and more becomes industrialized, FRP has evolved into a cost-effective and competitive structural material. This work examines flexural presentation of fiber-reinforced polymer (FRP) bars and concrete reinforced (RC) after beams conditioning for 6, 9, and 12 months simulated seawater in a wet-dry environment cycling. The purpose of this study is to introduce advancements in the research on FRP-reinforced concrete structures based on recent research. The bond presentation of FRP bars flexural behaviour, concrete, compression behaviour, and concrete of ductility structures reinforced with FRP bars in the last few years around the world are among the topics covered in this study. steel-FRP composite bars (SFCBs) and Basalt FRP (BFRP) are the two types of FRP bars used. For comparison, steel bars are used. During the conditioning, the beams are subjected to a steady load. There are a full of 24 simple-supported rays that being verified.

Artificial Intelligence Approach for the Control of SPMSG Based Grid Connected WECS

Nataraja. C, Dr. G. S. Sheshadri, Dr. Shilpa G N — Fri, 28 Jul 2023 00:00:00 +0000

In India, power plant requirement is rapidly increasing as non-conventional sources are in current need. Government financial aid plays important role for generator plant execution because of its tedious procedure. If the utilization of wind power production has to be doubled, then machines, turbines and converters are essential in two numbers. The research work includes parallel connection of two machines using star-delta-star transformer fashion resulting in six-phase permanent synchronous machine. This arrangement is more economical as the number of converters are reduced thereby increasing the efficiency by minimizing the switching losses. Initially rectifier setup is used wherein high frequency AC is converted to low frequency and maximum power point tracking is done with the aid of a converter. It is DC-DC conversion by decoupled DQ strategy. Later, it is again converted back to three phase AC so as to synchronize it to the grid. The system response is analysed by conventional PI controller by reducing the noise in the real & reactive power generation. Further, ANFIS-PI controller is implemented to improve the response of PI controller which is much essential for wind power generation. The MATLAB simulated results of PI controller system response and ANFIS-PI controller is presented in this paper.