The demand for electricity has increased substantially while the expansion of electricity generation, power transmission is very limited, due to environmental restrictions, consequently some transmission lines, limiting power factor. Power flow in the generation system, covering the area of North Sumatra and Aceh which is managed by PT. PLN (Persero), ETAP 4.0 (Electrical Transient Analizer Program) is a program that can display GUI (Graphical User Interface) with unlimited bus number, ETAP 4.0 is useful for Power flow study. The data required by ETAP 4.0 on a generation system is a one-line diagram, nominal kV, and generator, bus, transformer, transmission, and safety rating. The power flow approach method used is the Newton-Raphson method with maximum iteration of 99 and the accuracy of 0.000001. The problem of power flows under consideration is the normal state system, one transmission is disconnected, one of the plants is not operating. The results of the power flow study for each problem obtained the lowest bus voltage, the highest losses in the transmis. The largest power distributed in power plants, new in high voltage transmission, increases the power of power from power to load, changes in voltage problems and improves system stability. This paper aims to verify the capacitor's ability to improve voltage regulation (voltage stability) in electric power transmission systems, from this capacitor simulated using ETAP 4.0 included in Newton-Raphson model.
In the preparation of furan the raw material used are, Silica Sand, Resin, and Catalyst. Some problem that occurs are high level of water, high level of sour, high level of clay, unsuitable distribution, and low permeability. All those problems above make the power of furan not suitable with the target that has been stated, so that furan can easily be broken, cracked, and do not stand with high temperature and its power becomes weak. The result of this research is that the optimal combination based on the highest TOPSIS score is A1 B2 C3 with the composition of Resin 1.3%, Catalyst 22.5% and new sand 15% + reclaim sand 85%. The coefficient of loss function compression strength is 4.611,11 and 10.375 for the shear strength. The raising quality based on the confirmation experiment is 0.1018 for the compression strength and 0.2339 for the shear strength. The value of S/N in the confirmation experiment for the compression strength is 20.5817 and 23.0480, in which both numbers are in the trust interval limitation that has been decided. It shows that TOPSIS procedure is able to increase furan quality for both responses, that is compression strength response, and shear strength response all at once in one parameter setting.
The aim of this research is to know the fiber laminate adding effect to tensile strength, SEM photo, and hardness of teki grass (cyperus rotundus) composite specimen. Tensile and hardness test specimens were prepared by hand lay-up method with variations of 1, 2, and 3 fiber layers. Test results showed the highest tensile strength occurred in 1 layer fiber of 21.83 MPa and decreased in 2 layers of fiber and 3 layers of fiber of 17.95 MPa and 16.17 MPa. This is caused by random fibers that spread in all directions so that many fibers are not aligned with the tensile force. Addition of the fiber layer results in reduced resin volume so that the bond between fiber and matrix also decreases, which in turn will make the fiber cannot withstand tensile well. Analysis of SEM photographs also proves that the reduced volume of resin causes the bond between fiber and matrix to decrease resulting in cavities in 2 layer and 3 layers of composite. The results of the hardness test show that the addition of fiber layer decreases the hardness value. This is due to the soft grass fiber that is softer than the resin polyester, so that the added layer of fiber will reduce the hardness value.
Drilling is the process of making holes by pressing a rotating drill bit on the workpiece. During the machining process there is interaction between the drilling bit and the workpiece in the drill bit of the workpiece with a hole while the drill bit undergoes friction. Such a friction comes from the chipped surface that flows on the surface of the workpiece that has been cut; as a result, the tool wears out. The wear of the drill bit that occurs due to friction between the drill bit and the workpiece needs to be examined so that the extent of the wear and tear is known. The purpose of this study was to determine wear on the Dormer A100 Brazil drill bit with size (8 mm), rotation speed (260 rpm, 375 rpm and 710 rpm). Tool wear data was collected using a microscope with a magnification of 20x. Tool wear is seen three times during the drilling and the machining process. The result obtained is that the higher the cutting speed, the bigger the wear occurs. Keywords: Dormer A100, gray cast iron, drilling process
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