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<p><em>In the electric power system, the transmission system is a pathway to transmit electrical energy from the generator to the substation or from the substation to another substation which allows power losses and large voltage drops if the transmission length is relatively far and the overload is very high. affect the reliability of the transmission system. Analysis of power losses and voltage drop on the 150 KV high voltage transmission system at the Pati substation to the Jekulo substation. The analysis was carried out by conducting a survey at the research location then doing manual calculations and calculations using ETAP 12.6.0 software. The research method used was that the researcher collected voltage and current data at 10.00 and 19.00 WIB in one month and the transmission system supporting equipment specifications to be simulated in ETAP 12.6.0 from Pati and Jekulo substations in order to make comparisons between manual calculations and ETAP. 12.6.0.The conclusion of this study is the calculation of power losses manual calculation and simulation of ETAP 12.6.0 has a difference of 2.5% with the value of manual calculation power losses of 685.5 KW and the power losses from The simulation results reached 266.6 KW and the calculation of the presentation of power losses in the transmission line of GI Pati - GI Jekulo reached 6.8% exceeding the service percentage variation limit due to losses according to SPLN No. 72 of 1987 a maximum of 5% at least -10%.</em></p>

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<p><em> In the construction of multi-storey buildings, every aspect must be considered in accordance with the rules set out in the Act. Article 7 Paragraph 3 of Law 28/02 states that building construction must meet four aspects, namely safety, health, comfort, and convenience. To support the realization of these aspects, it is necessary to have a building utility. The Joint Lecture Building (GKB) of Sultan Agung Islamic University in Semarang, is a building that has 10 floors and is a busy building because it is used by several faculties, such as the PGSD Faculty, Language Faculty, Communication Faculty, and Nursing Faculty. In the operation of the GKB building, there are several complaints that occur in the GKB such as electricity that often goes out, some rooms have less lighting / dark, queues of elevator users are piling up and visually, the GKB building has the potential of being struck by lightning because it has high above average.</em></p><p><em>Seeing these conditions, the authors conducted a study to evaluate the reliability of buildings based on the utility of the building with methods that have been used in other studies, namely the scoring method that is based on visual inspection and by adding measurement methods, and calculations. From these results found the reliability value of the GKB building on the criterion of health scores got a score of 81, the health and comfort criteria scored 99, the ease criterion scored a score of 98. So the reliability of the GKB building got a score of 92 and was included in the unfit category.</em></p>