The development of today's technology has been developing very rapidly and carry a very big change because with the technology information can be obtained quickly, accurately and not limited by time and place. One o f the growing sectors in technology development is in the field of tourism which contributes to distribute information about the attractions more interactive, especially through Internet technology. Yogyakarta has a variety of tourist attractions that are so beautiful, but not many people know the various tourist attractions in the area. Information on tourist places will be known if given a forum to exchange information on the matter in the form of a website. In order to generate tourism website in accordance with the wishes of users, the necessary methods of User Centered Design (UCD) based to the user. It is intended to provide information for tourists so it will be easier to plan excursions according to what they want without hesitation choose the desired attraction. Tourism information system was built using PHP as a programming language and MySQL as a database manager. This information system design using the UCD that engage users by providing input in the form of a questionnaire. This information system contains the profiles sights, means of transportation used and distance traveled. Other facilities that can be enjoyed for information about travel agents who can serve a trip out of town, and the inn (hotel). To implement this system needs the previous test program testing and system testing and then be evaluated. The information system created is a system that is capable of displaying objects on the map and provide information on the map if the object is selected, the user can view more detailed position of an object to be searched. For site owners can perform additional object data without having to perform the construction site from scratch, in this case both the data on a map or information. By making this system the objects displayed on the map always updates that facilitate and assist the user in doing excursions in Yogyakarta.
Understanding the concepts based on problem solving is not an easy methodology in teaching the impact of power systems stabilizer (PSS) on transient synchronous generator using MATLAB capability. Experiments conducted in simulating sessions play an important role in this teaching. This simulation can simulate power system stability behavior with reasonable accuracy in less time. This transient phenomenon of a power system utilizing synchronous generator and modelling by fully three-phase model with changes in stator flux linkages neglected is analyzed by employed single machine infinite bus taken to the power system. Whereas a power system stabilizer which consist of a wash-out circuit, two stages of compensation, a filter unit, and a limiter, is applied to control voltage and frequency of power systems in transient condition. Proportional-integral-derivative (PID) controller tuned by Ziegler-Nichols’s method is cascaded to conventional PSS in order to enhance the response time of system while providing a better result in damping for oscillation. This gives the clear idea about PSS and PID controller impacts on transient synchronous generator and its enhancement to the students of electrical engineering program, Institut Teknologi Nasional Yogyakarta.
Abstraks Tulisan ini menganalisis arus induksi elektrostatis yang ditimbulkan oleh paparan medan listrik di bawah jaringan SUTET 500 kV. Perhitungan dikerjakan melalui simulasi dengan menggunakan pemogram Matlab yang memakai data paparan medan listrik di bawah jaringan SUTET-500 kV. Hasil analisis akan disandingkan dengan hasil investigasi tim Ombudsman Republik Indonesia (ORI) terhadap insiden black out yang disebabkan oleh kegagalan insulation pada span-tower T.434 – T.435 di dusun Malon, Semarang, Jawa-Tengah. Hasil analisis menunjukan bahwa pada Jarak Bentang Samping (lateral distance) 8 m, 10 m, 12 m, 14 m, 16 m, dan 18 meter merupakan kawasan yang berpotensi breakdown pada medium udara dengan sejumlah arus induksi di dalam ranting bagian atas pohon Sengon dengan kisaran 441.70 mA sampai dengan 4 726.1 mA. Arus Induksi ini bersesuaian dengan medan listrik yang terpapar di bagian ranting pohon Sengon tsb. Fakta ini menunjukan bahwa PT PLN (persero) telah lalai dalam hal malmanajemen pada Right of Way, ROW pada span tower T.434 – T.435, dan analisis arus induksi ini bersesuaian baik (good agreement) dengan hasil investigasi tim Ombudsman. Kata Kunci : ROW, Arus-Induksi, Black-Out, Ombudsman. Abstract This paper analyzes the electrostatic induced current generated by exposure to an electric field of 500 kV extra high voltage (EHV) transmission lines. The computations were carried out using the MatLab software and data of electric field exposure of 500 kV EHV transmission lines were been used. The results of the analysis will be juxtaposed with the results of the investigation of Ombudsman’s Republic of Indonesia (ORI) upon the black out incident which caused by insulation failure in the span-tower of the T.434 - T.435 at Malon hamlet, Semarang, Central Java. The analysis shows that the lateral distance of 8 m, 10 m, 12 m, 14 m, 16 m, and 18 m were an area that have the potential became breakdown-voltage in the air medium accompanied by the flowing induced current in branchs of Sengon's tree. This induced currents have a ranged of 441.70 mA up to 4 726.1 mA which have corresponding to the electric field are in the branchs of Sengon’s tree. This fact shows that PT. PLN (Persero) has been negligent in terms of mal-management of the Right of Way, ROW, in the span tower T.434 - T.435. The analysis of induced currents have in good agreement to the results of investigation of the Ombudsman team. Keywords : ROW, Induced-Current, Black-Out, Ombudsman
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