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  • One of the most important components of its role in power generation systems is generators. The Generator is a power generating machine,generated by receiving mechanical power and converting it to electricity. Any interference in the generator may interfere with the operation of the power plant system. Therefore, in a generator at the center of the plant would be equipped with a protective device that can protect the generator in order to avoid unwanted interference. One of them is by using Over Voltage Relay. Over voltage relay is a relay that works based on an increase in voltage reaching or exceeding its setting value.From analysis of protection system in the turbin generator quantity 118,2Vdc, produce voltage 7044 Vac in the no load condition. By giving load in quantity 2772 KW, so the voltage will be 6815 Vac.As much as using the load so the voltage which is plant will be so small. So it must be done by using voltage relay.