Analisis Perbandingan Perhitungan Short Circuit Pada Gardu Induk 150/20 kV (Studi Kasus Pada Gardu Induk Manyar Gresik)

Comparative Analysis of Short Circuit Calculations at 150/20 KV Substation (Case Study at Manyar Gresik Substation)

Penelitian ini bertujuan untuk mengetahui perbedaan besar arus hubung singkat antara perhitungan manual dan simulasi ETAP Power Station serta untuk mengetahui kesesuaian kapasitas pemutus tenaga Gardu Induk Manyar Gresik. Objek penelitian ini adalah mengukur short circuit current yang terjadi pada tiap bus .Penelitian ini memakai hitungan manual dan simulasi ETAP.Hasil perhitungan manual diperoleh dari data lapangan pada  Gardu Induk Manyar Gresik. Untuk hasil totaL gangguan short circuit salah satu fasa ke tanah yaitu 56.773 , Untuk hasil total gangguan short circuit fasa ke fasa yaitu 42.661,Untuk hasil total gangguan short circuit tiga fasa yaitu 49.055. Sedangkan hasil dari simulasi ETAP diperoleh dari data simulasi program software ETAP Power Station. Dengan memasukan data komponen yang sesuai pada Gardu Induk Manyar Gresik. Setelah dilakukan penelitian didapati  ketidaksamaan hasil short circuit current yang berbeda perhitungan manual dan simulasi ETAP dalam tiga keadaan yakni 0.368% kondisi gangguan short circuit current salah satu fase ketanah 0.550 %  kondisi gangguan arus hubung singkat fase ke fase dan terakhir 0.130 % kondisi gangguan short circuit current tiga fase. Kemudian, hasil perhitungan short circuit current tersebut akan dipakai sebagai indikator penentu kesingkronan kapasitas pemutus Gardu Induk Manyar Gresik. Diperoleh bahwa perbedaan rating pemutus yang terpasang lebih besar terhadap hasil pemilihan rating pemutus berdasarkan perhitungan manual. Lalu bisa disimpulkan bahwa pemutus tenaga yang terpasang pada di Gardu Induk Manyar Gresik memiliki kapasitas yang singkron dengan kebutuhan dan masih bisa dipakai. 

Kata kunci: Arus Hubung Singkat, Gangguan Arus, Kapasitas Pemutus Tenaga

This study aims to determine the difference in the magnitude of short circuit curent between manual calculation and simulation of ETAP Power Station and to determine the suitability of the power breaker capacity of the Manyar Gresik Substation. The object of this research is to measure the short circuit current that occurs in each bus. This research uses manual calculations and simulations of the ETAP Power Station software. The results of manual calculations are obtained from field data at the Manyar Gresik Substation. For the total result  short cirrcuit fault one pase to ground is 56,773, for the total result of short circuit fault for phase to phase is 42,661, For the total result of three phase short circuit fault is 49,055. While the results of the ETAP simulation are obtained from the simulation data of the ETAP Power Station software program. By entering the appropriate component data at the Manyar Gresik Substation.he results showed that the differences in the results of short circuit currents that were not significant between manual calculations and simulations of the ETAP Power Station software in three conditions included 0.368% for short circuit faulty conditions one pase to ground 0.550 % for short circuit current fault conditions phase to phase and lastly 0.130 % for three-phase short-circuit current fault. Then, the results of the calculation of the short circuit current will be useed as an indicatory to determine the synchronization of the breaker capacity of the Manyar Gresik Substation. It was found that the difference in the rating of the installed breaker is greater than the result of selecting the breaker rating based on manual calculations. So it can beconclude that the circuit breaker installed at the Manyar Gresik Substation has a capacity that is in sync with the neds and is still suiitable for use.

Keywords: Short Circuit Current, Current Disturbance, Breaker Capacity