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"Kompensasi beban untuk sistem penyulang distribusi tiga phasa empat kawat tidak seimbang dapat dilakukan dengan menempatkan dua sistem kompensator (sistem yang terhubung Y yang ditanahkan dan sistem yang terhubung D) secara paralel dengan beban. Metode kompensasi ini memanfaatkan metode Steinmetz[1]. Metode ini dapat menghilangkan arus urutan nol sekaligus arus urutan negatif pada sistem distribusi. Kompensasi hubung Y berfungsi untuk menghilangkan arus urutan nol dan kompensasi hubung delta berfungsi untuk menghilangkan arus urutan negatif.Berdasarkan analisis dan simulasi setelah kompensasi, ternyata metode ini tidak mengkompensasi secara sempurna (ideal) karena arus urutan nol dan arus urutan negatifnya masih mengalir meskipun nilainya kecil yaitu I0 = 0.27 A dan I2 = 0.39A. Setelah kompensasi, arus urutan nol dan arus urutan negatif yang mengalir kecil sekali, yaitu I0 = 0.27 A dan I2 = 0.39 A. Faktor daya sistem meningkat dari 0.92 menjadi 0.99. Rugi daya dapat dikurangi hingga 16.7%. Secara keseluruhan sistem kompensasi ini lebih baik dari sistem konvensional, namun bila ditinjau peralatan kompensatornya, sistem ini lebih mahal.

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Load compensation for unbalanced three phase four wire distribution feeders can be done by insertion of two compensation systems (wye grounded connected system and delta connected system) in parallel to the load. This compensation method based on Steinmetz method[1]. This method can eliminate zero sequence currents and negative sequence currents on distribution systems at the same time. Wye connected compensation is used to eliminate zero sequence currents and delta connected compensation is used to eliminate negative sequence currents.

Based on analysis and simulation after compensation, this method can not compensate ideally because the zero sequence currents and the negative sequence still flow although the magnitude is very small, I0 = 0.27 A dan I2 = 0.39 A. After compensation, the magnitude of zero sequence currents and negative sequence currents is very small I0 = 0.27 A dan I2 = 0.39 A. The system power factor is increasing from 0.92 until 0.99. Power losses can be decreased until 16.7%. Over all this compensation system is better than conventional method, but from the compensator equipment which is used, this compensation system is more expensive than conventional method."

"Indonesia menggunakan sistem tenaga listrik tiga fasa secara keseluruhan yang disalurkan ke konsumen baik dengan 2 kawat maupun 3 kawat fasa dan 1 kawat netral. Dalam jual-beli listrik yang dilakukan, diperlukan alat ukur energi listrik yaitu kWh-meter yang tersedia untuk satu fasa maupun tiga fasa. Pada sistem arus tiga fasa, daya yang disalurkan sama dengan jumlah daya pada masing-masing fasanya, sehingga hasil pengukuran dengan menggunakan kWh-meter satu fasa dan kWh-meter tiga fasa seharusnya sama. Tetapi pada kenyataanya, hasil pengukuran yang didapat tidak selalu sama.Dalam sistem tenaga listrik, kinerja pembangkit dan saluran transmisi tidak variatif atau keadaannya cenderung tetap dalam operasinya. Sedangkan komponen beban merupakan komponen yang paling bersifar variatif atau nilainya berubahubah (impedansi dan faktor daya-nya). Perubahan yang terjadi ini juga berbedabeda pada setiap fasanya, sehingga bukan hanya besar nilai beban yang berubah, tetapi juga menimbulkan ketidakseimbangan.Dengan demikian, karena beban bersifat variatif, maka faktor beban (dalam hal ini ketidakseimbangan beban) menjadi faktor dominan yang mempengaruhi perbedaan hasil pengukuran dengan menggunakan kWh-meter satu fasa dan kWhmeter tiga fasa.

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Nowadays,Indonesia is using three phase wire system to deliver electrical power to their consument. Supply of a electrical power by two wire or three phase wire and one neutral wire. In trading power electricity, we need device that can count how many supply of energy being transferred called kwhmeter. Kwhmeter divided into one phase kwhmeter and three phase kwhmeter. In three phase wire system, the number of electrical power being supplied is equal to the summary of electrical power each phase. So,measurement result by using one phase kwhmeter compare to three phase kwhmeter supposed to be the same. But,in real there's a different measurement result by using one phase compare to three phase kwhmeter.

In Electrical Power System, generator performance and transmission line are not so varied or their condition tend to stable on their operation. Whereas load component is the most varied on their value (impedance and their power factor). The fluctuation happened dissimilar on each phase. So that,not just the value of load impedance changing but it cause unbalanced load.

So that, caused by load are varied, then load factor (unbalanced load) is the dominant factor to influence the diferrence measurement result between one phase kwhmeter and three phase kwhmeter."

"Unbalanced voltage is the condition of three phase voltage that is unbalance either on magnitude or phase angle. One of the factor caused unbalanced voltage is the unbalanced current that is caused by single phase load Single-phase loads are widely used in residential dan lighting systems. Variation on single-phase loading causes currents flowing in phase conductors to be different from one another. Due to this unbalanced currents, there would be unbalanced voltage drop on each phase. In the end unbalanced voltage may supply three-phase loads such us induction motors. On induction motors, unbalanced supply voltage may cause many damage. This paper investigates the ejects of the unbalanced supply voltage on three-phase induction motor with various unbalance factor from 0,35 % until 9,7 %s. Under five different voltage magnitude unbalance conditions, the performance of the induction motor has been analyzed through testing on the laboratory. It is found that the increasing unbalance factor leads to decreasing of motor's rotating speed increasing of load current, and decreasing of motor's efficiency."