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"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."

"Pada skripsi ini akan dibahas desain (rancang bangun) dari sebuah perangkat penguji catu daya personal computer tipe ATX. Perangkat ini akan digunakan untuk menguji kemampuan sebuah catu daya ATX dalam menangani beban yang bervariasi. Perangkat ini hanya menguji keluaran catu daya pada rel 3,3 Volt, 5 Volt, dan 12 Volt. Masing-masing rel tegangan keluaran dihubungkan dengan sebuah beban variabel. Arus dan tegangan yang mengalir pada beban akan diukur oleh sensor arus dan tegangan. Pengaturan beban variabel dan monitoring arus dan tegangan, dikendalikan dari sebuah komputer melalui perantaraan sebuah microcontroller. Hasil pengujian yang berupa arus dan tegangan akan dibandingkan dengan standar yang dikeluarkan oleh Intel Corporation. Catu daya ATX yang baik akan dapat melewati proses pengujian yang dilakukan dengan alat ini dengan baik. Hasil pengujian menunjukkan bahwa di pasaran, masih terdapat catu daya ATX yang tidak memenuhi standar dan memiliki kapasitas yang tidak sesuai dengan kapasitas yang tertera pada labelnya.

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This final project describe a design of a Power Supply Tester for testing ATX-type Personal Computer (PC) Power Supply. This instrument is use to test the power handling capability of a PC Power Supply when driving loads that varied. This instrument only test three main rails in the power supply output ' 3,3 Volts rail, 5 Volts rail, and 12 Volts rail. Each rail is attached to a variable load. Voltage and current flowing into the load is sensed using current and voltage sensor. The variable load and current & voltage sensors is controlled using computer via a microcontroller.

The result of the testing process ' which are current and voltage from the tested power supply, will be compared with a standard from Intel Corporation. A good power supply will passed this test with a good result. The result from this experiment shows that unqualified ATX power supplies are still exist in the market."