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INDONESIA
Jurnal Teknik Elektro
Published by Universitas Trisakti
ISSN : -     EISSN : -     DOI : -
Core Subject : Engineering,
Electrical & Electronics Engineering
Arjuna Subject : -
Articles 3 Documents
 1 
Search results for , issue " Vol 6, No 2 (2007)" : 3 Documents clear
STUDI PENYETELAN RELAI DIFERENSIAL PADA TRANSFORMATOR PT CHEVRON PACIFIC INDONESIA Liem Ek Bien, Liem Ek Bien; Helna, Dita
Jurnal Teknik Elektro Vol 6, No 2 (2007)
Publisher : Jurnal Teknik Elektro

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Abstract

The quality of an electric power system is measured by its continuity of service, good controland maintenance. The good continuity of service can be obtained if all the components ofpower systems can operate well in every situation and condition, either in normal or inabnormal condition. In abnormal condition, the protection system has an important role indetecting every disturbance and disconnecting the disturbed parts from the system. Thepower transformer is the main component in a substation. The disturbances in thetransformer should be isolated so as not to disturb the system during distribution of theelectric power to other load. The differential relay on the power transformer is a protectionrelay to detect internal disturbance. This paper discusses the setting and mismatch error ofdifferential relay in substation of Central Duri at switchgear #3 at PT Chevron PacificIndonesia (PT CPI).Keywords: short circuit, differential relay, power transformer
KAJIAN PENERAPAN FREE SPACE OPTIC (FSO) PADA GEDUNG E DAN FG DI KAMPUS A UNIVERSITAS TRISAKTI Ningsih, Yuli Kurnia; Surjati, Indra; Danubrata, Oky
Jurnal Teknik Elektro Vol 6, No 2 (2007)
Publisher : Jurnal Teknik Elektro

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Abstract

Free Space Optics (FSO) as Data Communication System technology contribute positivelynot only to its users but also to its operators. It is regarded as the development of infraredcommunication that can overcome some drawbacks of wireless data communication such aslosses. This study concerns the implementation of Free Space Optics for cross connectedbuildings with the calculation of link margin factor to determine exactly the resultingperformance under different kinds of weather: sunny, moderate rain and heavy rain. Theresults shown are those for the distance of 35.66 m. The obtained attenuation factors are asfollows: -0.0078452 dB in sunny weather, -0.0156904 dB in light rain; and -0.1412136 dB inheavy rain. These results are still less than the link margin of 32.2228 dB, which means thatFree Space Optics is good enough to be implemented. The result also showed that for thedistance of 118.79 m, the attenuation factor is -0.4704084 dB in heavy rain and still lessthan the link margin of 22.5524 dB. It means that Free Space Optics can be implemented forline of sight communication.Keywords: Free Space Optics (FSO), link margin, weather, attenuation factor
SIMULASI FILTER SALLEN KEY DENGAN SOFTWARE PSPICE Prawiroredjo, Kiki
Jurnal Teknik Elektro Vol 6, No 2 (2007)
Publisher : Jurnal Teknik Elektro

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Abstract

A Sallen–Key filter is a type of active filter, particularly valued for its simplicity. The circuitproduces a 2-pole (12 dB/octave) lowpass or highpass response using two resistors, twocapacitors and a buffer amplifier or operational amplifier. By varying the gain of theamplifier the filter will have a certain type of frequency response such as Bessel, Butterworthor Chebyshev. Higher-order filters can be obtained by cascading two or more stages. Thisfilter topology is also known as a voltage controlled voltage source (VCVS) filter. The opampprovides buffering between filter stages, so that each stage can be designedindependently. PSpice software can be used to simulate the filter circuits and the frequencyresponse can be analyzed before the circuits are built. Designers can change the frequencyresponse easily by changing the values of the components in the filter design by PSpicesoftware. The results of the simulation show that the Bessel response has the lowest outputvoltage and the lowest roll-off, Butterworth frequency response has higher output voltagethan Bessel and as the most stable one but Chebyshev response has the highest outputvoltage and the highest roll-off but not stable.Keywords: Sallen-Key filter, PSpice software, frequency response, lowpass filter, highpassfilter, Operational Amplifier, Bessel, Butterworth, Chebyshev.

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