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This work explains the classical methods for predicting the performance of the Buchholz relay. The traditional methods use the simulation by giving a phenomenon of incipient fault into the oil-immersed transformer. The Buchholz relay is a type of mechanical relay whose operating mechanism is influenced by oil and gas in the transformer tank tend to move into the expansion tank through the interconnecting piping. This device is a critical component that is integrated into the oil-immersed transformer protection philosophy. An electronic circuit-based simulator that is integrated with a circuit breaker operation control panel was chosen as a means for creating conditions during alarm or trip. The performance measurement provides simulated fault conditions for setting on alarm and trip. The provision of faults simulation in the form of pressing a push-button one time to simulate the existence of an alarm condition. In that condition, the CBs control panel does not operate, but the appointment of an alarm signal. Based on that, the Buzzer sounds and the status check trip is still normal or "no lock-out". Giving full pressure as a form of simulation for trip conditions on the Buchholz relay, the control panel designates the condition of the two CBs (side of 150 kV and 20 kV side) open, and the alarm signal designation also occurs with Buzzer sounding. Hence, the check trip status becomes "lock-out". The Buchholz relay serves to detect the presence of gas caused by local heating or pressure surges in the transformer oil. After giving all of the conditions, the Buccholz relay performance is known.

CLASSICAL METHODS TO PREDICT THE PERFORMANCE OF BUCHHOLZ RELAY BY GIVING THE PHENOMENA OF INCIPIENT FAULT INTO THE OIL IMMERSED TRANSFORMER