Main Article Content
Public and government demands for PLN to serve all people to enjoy electricity with a target of 100% Electrification Ratio. To fulfill the Electrification Ratio, of course, it is necessary to increase the capacity of the distribution transformer with the addition of an insert transformer and a new transformer. So that the increasing number of connections to customers' homes or buildings will result in overload or unbalance loading of the distribution transformer. The problem is the number of transformers 3,938 units at PLN UP3 Padang with limited load measuring officers only 70 teams, there is still a transformer failure of 0.41% in 2019. This is because the load measurement is done directly (manually on site) so it requires large human resources and costs. Under these conditions, a realtime online load measurement system is needed. This study uses the Root Couse Problem Solving (RCPS) methodology and system and equipment design by creating a transformer load monitoring system both unbalance and overload online Real Time. With this System and Equipment, the substation load in realtime with a speed of 2 seconds, the condition of the transformer is known. Telemetering function by sending load data so that the risk of damage to the transformer can be reduced because this tool is an early warning against unbalanced loads, single phase outages and so on. So that PLN can maintain life time and recovery time in maintaining the quality of its service.
 E. Julianto, “Studi Pengaruh Ketidakseimbangan Pembebanan Transformator Distribusi 20KV PT PLN (PERSERO) Cabang Pontianak,” J. Tek. Elektro, 2016.
 IAQ, “Root Cause Analysis and Problem Solving,” Mind Tools, 2014.
 B. Vo, E. Kongar, and M. F. Suarez-Barraza, “Root-Cause Problem Solving in an Industry 4.0 Con,” IEEE Eng. Manag. Rev., 2020.
 “Studi Eksplorasi Arus Pada Kawat Netral Akibat Ketidakseimbangan Arus Beban Pada Unit Transformator Distribusi Di Universitas Negeri Semarang,” Edu Elektr. J., 2014.
 S. Samsurizal and B. Hadinoto, “Studi Analisis Dampak Overload Transformator Terhadap Kualitas Daya Di PT. PLN(Persero) Up3 Pondok Gede,” KILAT, 2020.
 L. Frisila and C. G. Irianto, “Perancangan Prototipe Real Time Monitoring Beban Transformator Distribusi 20 KV Berbasis Mikrokontroler,” JETri, 2017.
 R. H. Yeh, K. C. Kao, and W. L. Chang, “Preventive-maintenance policy for leased products under various maintenance costs,” Expert Syst. Appl., 2011.
 F. Scatiggio and M. Pompili, “Health index: The TERNA’s practical approach for transformers fleet management,” in 2013 IEEE Electrical Insulation Conference, EIC 2013, 2013.
 A. N. Jahromi, R. Piercy, S. Cress, J. R. R. Service, and W. Fan, “An approach to power transformer asset management using health index,” IEEE Electr. Insul. Mag., 2009.
 A. Azmi, J. Jasni, N. Azis, and M. Z. A. A. Kadir, “Evolution of transformer health index in the form of mathematical equation,” Renewable and Sustainable Energy Reviews. 2017.
 S. M. A. Suliman and S. H. Jawad, “Optimization of preventive maintenance schedule and production lot size,” Int. J. Prod. Econ., 2012.
 M. Scheffer et al., “Early-warning signals for critical transitions,” Nature. 2009.
 I. P. G. Kartika, I. K. Wijaya, and I. M. Mataram, “Analisis Beban Takseimbang Terhadap Rugi-Rugi Daya Dan Efisiensi Transformator Kl0005 Jaringan Distribusi Sekunder Pada Penyulang Klungkung,” J. Spektrum, 2018.
 F. Fahrurozi*, Firdaus**, “Analisa Ketidak Seimbangan Beban Terhadap Arus Netral dan Losses Pada Transformator Distribusi di Gedung Fakultas Teknik Universitas Riau,” Jom FTEKNIK, 2014.
 U. Franke, H. Holm, and J. König, “The distribution of time to recovery of enterprise IT services,” IEEE Trans. Reliab., 2014.
 G. Nicoll and M. J. Boss, “Transformers,” in Electrical Safety: Systems, Sustainability, and Stewardship, 2014.
 A. H. Al-Badi, A. Elmoudi, I. Metwally, A. Al-Wahaibi, H. Al-Ajmi, and M. Al Bulushi, “Losses reduction in distribution transformers,” in IMECS 2011 - International MultiConference of Engineers and Computer Scientists 2011, 2011.
 T. Nusa, S. R. U. A. Sompie, and E. M. Rumbayan, “Sistem Monitoring Konsumsi Energi Listrik Secara Real Time Berbasis Mikrokontroler,” E-Jurnal Tek. Elektro dan Komput., 2015.
 H. Sultan, “Mikrokontroler Arduino,” J. Chem. Inf. Model., 2019.
 N. G. Forero Saboya, “Normas de Comunicación en Serie : RS-232, RS-422 Y RS-485,” Rev. Ingenio Libr., 2012.
 C. McInnes, “Command and control,” in Routledge Handbook of Air Power, 2018.
 E. E. Putri, “SMS Gateway,” Indones. J. Netw. Secur., 2015.
 V. K. A. V. T. Katankar, “Short Message Service using SMS Gateway,” Int. J. Comput. Sci. Eng., 2010.
 J. Letkowski, “Doing database design with MySQL,” J. Technol. Res., 2014.
 M. J. M. Pelgrom, Analog-to-digital conversion. 2010.
 Ishak, “Memanfaatkan Komunikasi Port RS-232 Untuk Perancangan Mengoptimalkan Sistem Jembatan Timbangan Digital,” Saintikom, 2010.
 Z. M. Fadlullah, M. M. Fouda, N. Kato, X. Shen, and Y. Nozaki, “An early warning system against malicious activities for smart grid communications,” IEEE Netw., 2011.
 W. B. Prasetyo, “Pengaruh kualitas pelayanan, kepercayaan dan kepuasan terhadap loyalitas pelanggan (studi pada swalayan luwes purwodadi ),” J. Manaj. Pemasar., 2013.