Single-phase induction motors are a type of electric machine that are widely used in people’s lives due to it has advantages such as lower prices, simple maintenance and construction. However, the single-phase induction motor also has a weakness, which is difficulty in setting up the rotation. The rotation setting of a single-phase induction motor can be affected by changes in the input frequency and changes in the input voltage. In this study is to design the control of a single-phase induction motor in a commonly used fan. The speed of the single-phase induction motor is regulated based on the number of visitors, using artificial intelligence namely fuzzy logic. The fuzzy logic controller can be group visitors to the room to determine the speed of the fan. The visitors are divided into three groups, namely “many” to indicate the maximum speed, “medium” for medium speed and “few” for low speed. Therefore, this research may contribute as an energy-saving solution using artificial intelligence.
Minimizing losses in electric network should be considered the placing a shunt capacitor, the voltage level on each bus, the size and number of shunt capacitors to be used, and the supply of maximum and minimum of generator power. This paper is conducted the determination of location and size of shunt capacitor to be allocated in electric power transmission networks. The simulation using Genetic Algorithms (GA) method was applied to solve the problem of reactive power compensation optimation. To find out amount of compensation for voltage drop and power losses that occur in the system, a load flow analysis was performed using the Newton-Raphson method. The result of capacitor placement and capacitor capacity were shown the highest voltage conditions on bus 4 of 1.050 Mvar and the lowest on bus 24 of 9.69 Mvar. The optimization system was revealed the total losses system of 12.793 MW with a total generation cost of 15447.44 $/h for the capacitor reduction size of 18.8 Mvar. Therefore, the system can save 6.2 Mvar’s capacitors.
Motor induksi dikelompokkan ke dalam jenis beban tak linier. Beban tak linier akan menghasilkan suatu harmonisa. Prinsip – prinsip induksi elektromagnetik membuat motor induksi mempunyai sifat kejenuhan atau saturasi, yaitu suatu keadaan di mana pada kondisi tertentu, arus listrik yang dihasilkan tidak sebanding dengan kenaikan tegangan yang diberikan pada motor, dan bahkan akan cenderung tetap.Harmonisa berpengaruh pada sistem tenaga listrik. Saluran pada jaringan transmisi akan mengalami peningkatan impedansi sehingga meningkatkan rugi-rugi tembaga dan fluks. Pada transformator daya, harmonisa akan menyebabkan peningkatan rugi-rugi besi, arus bocor dan stress pada isolasi. Hal ini akan mengakibatkan pemanasan berlebihan pada transformator daya tersebut. Pada sisi konsumen listrik, pengaruh harmonisa ini adalah menyebabkan peralatan listrik akan bekerja dengan tidak semestinya. Dari sisi konsumen listrik (motor induksi), untuk mengetahui faktor-faktor dominan yang mempengaruhi tingkat harmonisa yang dihasilkan oleh motor induksi tiga fasa tersebut maka perlu dilakukan penelitian ini. Penelitian ini bertujuan untuk menganalisis tingkat harmonisa (THD) yang dihasilkan akibat pengaruh tegangan masuk yang diberikan pada motor induksi tiga phasa dan menganalisis tingkat harmonisa (THD) yang dihasilkan akibat pengaruh beban pada motor induksi tiga phasa tersebut.Semakin besar tegangan yang diberikan pada motor induksi tiga phasa, maka semakin turun THDnya. Dimana THD terendah didapatkan pada saat motor diberikan tegangan nominal dari motor induksi tiga phasa tersebut dengan THD tegangan 2% dan THD arus 4,6%. Semakin besar beban yang diberikan pada motor induksi tiga phasa, maka semakin turun THDnya. Dimana THD terendah didapatkan pada saat motor diberikan beban dibawah daya keluar nominal dari motor induksi tiga phasa tersebut dengan THD tegangan 1,9% dan THD arus 2,7%.
The goal of the retrofit at Zamrud substation is to transform a 28 MVA power transformer’s neutral point grounding system from direct grounding to grounding using a 20 Ohm Neutral Grounding Resistor (NGR). The amount of short-circuit current produced will fluctuate with the installation of NGR. It is necessary to re-setting the Ground Fault Relay (GFR) on Zamrud substation. To estimate the value of the short-circuit current after installing the NGR, the impedance matrix approach is used to calculate it. According to the results, LG’s largest short-circuit current is 397.83 A and its smallest is 313.55 A. Meanwhile LLG has a maximum short-circuit current of 5.334.30 A and a minimum short-circuit current of 943.31 A. Therefore, after NGR installation, the value of the relay setting is as follows: GFR pickup current on the transformer grounding GFR relay is 234.29 A, GFR pickup current on the neutral feeder 1 is 19.96 A, GFR pickup current on the neutral feeder 2 is 30.42 A, and GFR pickup current on the neutral feeder 3 is 38.40 A.
This research was conducted at Madrasah Ibtidaiyah Negeri I (MIN 1), a state Islamic elementary school in Pekanbaru. The school is located on Jalan Sumatra Pekanbaru. The school consists of 21 classrooms, one teacher’s room, one administration' room. 1 Principal's office, 1 Vice Principal room, and one emergency room. The buildings use electricity as the source of energy for daily activities, such as for lighting, computer, printers, scanners, water pump, air conditioners and many more. From the data of the research, the electricity is not become a problem for schools, because of the fewer uses of power in educational activities — the use of electrical energy only for lighting the classrooms if the weather not good. The electricity mostly used for office and administration activities such as for the computer, printers, air conditioning, and teaching activities. From the data and the electrical used by MIN 1 Pekanbaru are not too high.
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