@thesis{thesis, author={HERMAWAN AGUNG and Makkulau Andi and Yogianto A. Agus}, title ={Simulasi dan analisis stabilitas transien akibat pelepasan beban dan gangguan hubung singkat unit 1 PLTU PT. Indonesia Power Suralaya PGU}, year={2020}, url={http://156.67.221.169/2980/}, abstract={PLTU Suralaya is one of the largest generator units in Indonesia with a 3400MW power supply, when the generator system is faulted due to fault or mechanisms of network systems such as load addition and load Rejection will have a large impact on network stability. Transient stability is the ability of the power system to maintain synchronization when a transient electrical fault occurs. The method This study uses qualitative research approaches. The research related to the transient stability is using models and simulations with the Matlab Simulink application program that uses the unit 1 Suralaya PGU model. Short-circuited occurred on the Bus 500 KV, the timing of the disconnection of frequency fault is unsafe at 0.5 seconds and the safe disconnection time is 90 mili sec based on the standard SPLN No 52-1 1983 on a 500 KV voltage system. Generator voltage is unsafe when CB is open 0.5 second and safe at the time of CB Open 0.09 sec as a result voltage increase at the range is still permitted. The rotor angle is not secure on the CB open 0.5 s and secured on the CB Open 0.09 s the rotor angle oscillates around the initial rotor angle value at the allowable limit.} }