Nowadays CDMA and GSM modem technology are still widely used by the community, especially in rural areas and small towns that are quite far from the BTS location. This paper designs the Yagi-Uda antenna for CDMA modems on the 800 MHz frequency. The number of elements used is 1 driven, 1 reflector and 16 directors. The antenna design simulation uses NEC-Win Pro 1.6 and Ansoft HFSS 13.0 software. Simulations using NEC-Win get VSWR values 1.59 and S11 -13 dB (uses Matlab). Next, the simulation using Ansoft HFSS obtained the results of VSWR 200000 and S11 -9 dB. The simulation results also show that antenna design already has a directional radiation pattern.
This study aimed to: examine the total power loss of the primary distribution system and the impact of the capacitor bank and express feeder allocation to corrective voltage level on the primary distribution system. Therefore, a case study was taken in the primary distribution of the PLTD (diesel generation) Kelapa Lima Merauke then using Electrical Transient and Analysis Program (ETAP) simulation models to make power flow analyzing. The datas needed is one-line diagram, nominal voltage, generator rating, bus, transformer and transmission / distribution. The results obtained are normal loading power losses of 0.014 MW, voltage level for Feeder of Kota Satu was still stable because in cover range of voltage drop ± 5 %. The other side, corrective voltage level for Feeder of Merkuri from 17.65 kV to 17.75 kV after capasitor bank in amount of 134 kVAr allocated, drop voltage decreased from 13.31 % to 11.25 %, but it still unstable because out of cover range of voltage drop. For that, after using express feeder can be correct voltage level for feeder of Merkuri from 17.65 kV to 19.39 kV or drop voltage decreased from 13.31 % to 3.05 %. Therefore, using express feeder on Merkuri feeder better than capacitor bank allocation.
This research aims to control the speed of an induction motor by exploiting changes in the fundamental frequency. The inverter as the main part of the variable frequency driver (VSD) uses the IRFZ44n Mosfet as a power switch with a full bridge topology to convert the DC source to AC power. Fundamental frequency manipulation takes place during the conversion process. The method used is to change the variable fundamental frequency of the SPWM signal generated by the Arduino nano to control the power switch. Experiments are carried out based on two stages, namely simulation, and experiment. The simulation is performed using the Pspice A/D Lite software to take time sample data (HIGH and LOW) at each frequency change of 13Hz, 25Hz, 38Hz, and 50Hz, then the sample data is input on the Arduino nano as an SPWM signal generator to control the power switch. The results of the variable frequency drive test are the frequencies generated to drive the induction motor at 12.50 Hz, 24.04 Hz, 35.71 Hz, and 48.54 Hz at motor speeds from 227.7 to 1359.6 rpm.
Jaringan distribusi primer merupakan salah satu bagian sistem tenaga listrik dan peranannya sangat penting dalam penyaluran daya listrik dari gardu-gardu induk sisi beban sampai ke pusat beban. Oleh karena itu jaringan distribusi primer harus senantiasa beroperasi dengan baik untuk menjaga kontinuitas penyaluran daya listrik ke konsumen tersebut. Tetapi dalam pengoperasiannya, jaringan distribusi primer tidak luput dari gangguan sehingga harus dilindungi dengan menggunakan sistem proteksi yang baik. Jaringan distribusi primer di PLTD Kelapa Lima Merauke menggunakan sistem pentanahan dengan resistansi rendah 40 Ohm dan rele proteksi yang khusus terpasang untuk mendeteksi arus hubung singkat yang terjadi akibat gangguan hubung singkat satu fasa ke tanah yaitu rele gangguan tanah (ground fault relay/GFR). Tinjauan terhadap rele GFR ditiikberatkan pada penentuan besarnya arus hubung singkat satu fasa ke tanah maksimum yang terjadi pada setiap feeder dengan menggunakan metode analisis berdasarkan konsep literature dan kemudian digunakan sebagai dasar untuk perhitungan setting arus GFR. Hasil analisis menunjukkan bahwa besarnya arus hubung singkat satu fasa ke tanah maksimum yang terbesar yaitu terdapat pada feeder KOTA I dan feeder MERKURI masing-masing sebesar 274,527 Ampere. setting arus rele GFR pada feeder KOTA I dan feeder MERKURI masing-masing sebesar 27,4527 Ampere dan feeder POLDER, KOMPI C, MULI dan KOTA II masing-masing sebesar 26,4222 Ampere. Setting arus ini masih dalam batas interval setting arus yaitu 20 Ampere – 70 Ampere. Kata Kunci: GFR, Feeder.
The purposes of this study are: (1) To estimate the real number of people who live- in Kelurahan Karang Indah; (2) To analyze the pattern of domestic water consumption of Kelurahan Karang Indah community; (3) To analyze the ethnic characteristics of the domestic water consumption patterns; (4) To analyze the adaptation and mitigation community of the clean water. The results showed that the real number of people who live in Kelurahan Karang Indah was two times higher than the statistic data. The water consumed for domestic activities was 51.6 liters/day/capita which is higher than Indonesian National Standar (46 liters/day/capita). There are no significant differences in the patterns of domestic consumption between dry season and rainy season. Awyu people were known for using more water than other tribes especially for bathing, drinking and washing, while for cooking Marind people use more water than other tribes. There is no specific adaptation- in clean water consumptions. The people adaptation for water consumption are indicated by their habit of drinking less water than required, queuing up at night to get clean water and using poor water quality for bathing or washing.
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