Master Installation Design and Transformer Need Analysis in Faculty of Engineering Udayana University Denpasar

—Faculty of Engineering, Udayana University, PB. Sudirman Denpasar has 5 building units (buildings A, B, C, D, AF). Currently the AF building is undergoing renovation and is planned to be on 4 floors. The entire building will be equipped with the installation of 2 elevator units. The construction of the two new buildings and the installation of the 2 elevator units caused new problems of electricity shortages, changes in safety settings, unbalanced loads, and changes in the size of the main cable and the needs of the transformer and its capacity. The AF building and building A are supplied from sources on the transformer which are joined with other faculties, while Buildings B, C, D and E are fed by one transformer No. 124303818 with a capacity of 160 kVA. The plan to build an Alumni Building does not yet have electricity. Based on the analysis of the design, the total amount of power needed in all buildings in the Sudirman Denpasar Faculty of Engineering is the result of the AF Building planning = 134,280 watts, the Alumni Building planning results (building area and building functions are considered equal = 134,280 watts), so the total needs power to the two buildings = 271 560 Watt with a load deviation of 65%, then 0.65 x 271 560 W = 176 514 Watt. Then the total power requirement of the entire building is 259,340 watts. The measurement result of Cos ⱷ 0.92, then P (kVA) = 281,891,3043 Ampere = 281,8913 kVA. So that the transformer needs that must be prepared by the Faculty of Engineering to meet the power requirements at the Faculty of Engineering, Udayana University Denpasar with 80% transformer efficiency is a 350 kVA transformer with a placement position around the Faculty of Engineering area.

I. INTRODUCTION 1 The Faculty of Engineering of Udayana University Denpasar has 5 building units (buildings A, B, C, D, AF). Currently the AF building is undergoing renovation and is planned to be on 4 floors. The entire building will be equipped with the installation of 2 elevator units. The construction of the two new buildings and the installation of the 2 elevator units caused new problems of electricity shortages, changes in safety settings, unbalanced loads, and changes in the size of the main cable and the needs of the transformer and its capacity. The AF building and building A are supplied from sources on the transformer which are joined with other faculties, while Buildings B, C, D and E are fed by one transformer No. 124303818 with a capacity of 160 kVA. The Alumni Building plan does not yet have a electricity source Corresponding author I G N Janardana -janardana@unud.ac.id Based on these problems, the Faculty of Engineering of Udayana University is very urgent to review the need for electric power that is able to burden all the electrical system devices to avoid repeated blackouts and power quality is maintained. Then in this study an analysis of power requirements will be carried out due to the construction of the AF building and the alumni building of the Faculty of Engineering, Udayana University along with the addition of elevators. The existence of an elevator is a substitute for the function of the stairs in reaching each floor in a multi-storey building, therefore the existence of an elevator cannot be ruled out considering it can make energy and time efficient.

Power requirements for equipment
In its operation, a building will certainly be equipped with supporting equipment such as computers, LCD, Wi-Fi and others. Everything requires electrical power which is very necessary to be calculated so that electrical power remains available adequately.

6 Earthing System
Earthing system is a series / network starting from ground poles / electrodes, connecting conductors to ground terminals which function to channel excess current to earth, so that the equipment can avoid the effects of lightning and other foreign voltages [11] :

7 Types of Electric Power Quality Problems
Problems power quality such as symptoms of transition ( Transient ), the symptoms of changes in variables (voltage, current, etc.) that occurred during the transition from soft operating conditions ( steady state ) to another state [12] .

Research Location
The study was conducted at the Faculty of Engineering, Udayana University, Denpasar and the Electrical Installation Laboratory. Currently, it is planned to build an AF building and an alumni building with almost the same area. The entire load at the Denpasar Engineering Faculty is supplied from two transformers, namely at the secretariat building and building A is supplied from the source at the transformer which is incorporated with other Faculties, while Buildings B, C, D and E are supplied by one transformer No. 124303818 series with a capacity of 160 kVA.

Analysis of Electrical Power Requirements in AF Building Plans, Alumni Building and Lift Plans
The Faculty of Engineering of Udayana University is currently planning the construction of a building located on Jalan PB. Sudirman Denpasar . The building was built on an area of 384m 2 and planned to be built with 4 floors .
Based on data from the measurements of the building's existing electric power, the total real power needed in buildings A, B, C and the combined buildings D and E is 82,826 watts or 82,826 kW. The measurement data is real data with the condition of all equipment operating. The results of the analysis of the new building plan using formula 1, formula 2 and the planned elevator specification data obtained the total number of loads in all buildings in the Sudirman Denpasar Faculty of Engineering are as

Grounding System
The Udayana University Faculty of Engineering Campus Denpasar with sandy clay texture . The earthing system installed at this time is the rod type. Based on the measurement results, the soil resistance value = 0.23 ohms, so that the ground ρ is 28.89 Ohm-meters. The results of the analysis to get the earth resistance value <3 Ohm, obtained type 2 (two) rods with s <L obtained depth of 8 meters each with a distance between the electrodes of 2 meters obtained earth resistance value 2.4940 ohms.
V. CONCLUSION AND RECOMMENDATION

Conclusion
Based on the analysis of the design it was concluded that the total amount of power needed in all buildings in the Sudirman Denpasar Faculty of Engineering is the result of the AF Building planning = 134,280 watts, the Alumni Building planning results (building area and building functions are considered equal = 134,280 watts), so the total power requirements of the two buildings = 271 560 Watt with a load deviation of 65%, then 0.65 x 271 560 W = 176 514 Watt. Then the total power requirement of the entire building is 259,340 watts. The measurement result of Cos ⱷ 0.92, then P (kVA) = 281,891,3043 Ampere = 281,8913 kVA. So that the transformer needs that must be prepared by the Faculty of Engineering to meet the power requirements at the Faculty of Engineering, Udayana University Denpasar with 80% transformer efficiency is a 350 kVA transformer with a placement position around the Faculty of Engineering area.

Recommendation
Based on the results of research to keep maintaining the quality of electric power after electric power is fulfilled, it can be recommended to conduct data collection of load data on a periodic basis for subsequent load growth.