Study of Electrical Systems in Engineering Faculty Udayana University Bukit Jimbaran

Electrical systems that serve the Dean of electricity load, the electricity load of the Departement of Architecture, Departement of Mechanical Engineering, Departement of Electrical Engineering, Departement of Information Technology, external lighting facilities supplied by transformers with a capacity of 200 KVA. Lately the quality electrical system has begun to decline with frequent interruptions such as the breakdown of electricity to the load, unbalanced load, THD current exceeds the standard, the fuse on the incoming to the parent panel and the fuse on the main panel is often burned, the grounding system resistance value exceeds the standard equipment value, cable temperature exceeds the standard, even voltage rises to 500 volts. The purpose of this study is to determine the causes of disruption of electricity, and produce a new master installation design to improve the system. Based on the results of the analysis, it was found that the importance of channel separation between loads to the Dean building with the Departement of Architecture building with cable capacity for the Dean building of NYY 4 x 95 mm2 and the safety of the NFb 200 Ampere mains. For cables to the building load, the Departement of Architecture installed a new main cable with NYY 4 x 50 mm2 cable size and NFb 150A main safety. It is necessary to replace the main NFb safety at the MDP parent panel which supplies the load to the Departement of Mechanical Engineering building from 160 Ampere to 200 Ampere. The entire phase in each panel does not meet the IEEE 519 2014 standard, so it is very important to install a filter. Ground resistance values on all panels vary above the standard with a value of 12 to 62 ohms. So it needs to be made a new grounding. When using a plate grounding system, the number of plates that need to be planted is 25 sheets with a size of 2m x 1 m with a planting depth of 2 m. Whereas when using a grid type earth system, a grid with a size of 3 meters x 3 meters is needed with a total grid length of 2976 meters and a depth of 3 meters. Index Terms Main electrical installation design, electrical power quality

I. INTRODUCTION 1 Electrical systems that servethe Dean of electricity load, the electricity load of the Departement of Architecture, Departement of Mechanical Engineering, Departement of Electrical Engineering, Departement of Information Technology, external lighting facilities supplied by transformers with a capacity of 200 KVA. Lately the quality electrical system has begun to decline with frequent interruptions such as the breakdown of electricity to the load, unbalanced load, THD current exceeds the standard, the fuse on the incoming to the parent panel and the fuse on the main panel is often burned, the grounding system resistance value exceeds the standard equipment value, cable temperature exceeds the standard, voltage rises to 500 volts. The purpose of this study is to determine the causes of disruption of electricity, and produce a new master installation design to improve the system.
Based on these problems, research on the existing main installation in the electrical system at the Faculty of Engineering, Udayana University Bukit Jimbaran is conducted to avoid the cut off of electricity to the loads and also to improve the quality of electrical power.

State of the Art
In the study "Analysis of the Effect of Load and Harmonics Imbalance on Imposition in Neutral Wire and Transformer Power Loss". The results of the analysis showed that the higher the level of load imbalance and harmonic distortion, the higher the level of loading is treated neutral which results in increased losses of transformer [1].
In the research "Analysis of Grounding System As Building Equipment Security Udayana University Denpasar" obtained results that in sandy clay soil, for earthing resistance value ≤ 3 ohms, earthing type 1 (one) rod requires a minimum depth of 14 meters, type 2 rod s < L depth of at least 8 meters distance between rods 2 meters, earthing type 2 rod S> L minimum depth of 6 meters with spacing between rods 8 meters, type of earthing plate with 3 x 1 meter plate length 2 meters depth and grid type with a total length of 504 electrodes 2.5 meter depth meter [2].
The results of the study "The Effect of Age on Several Bentonite Additive Substances Against Grounding Resistance Value", obtained the volume of bentonite has a significant effect on the resistance value of the rod to a certain volume and is very suitable to be given to rocky soil (hard soil) [3].
Research "Difference in the addition of salt with Bentonite to the value of grounding resistance" shows that there is a difference between salt and bentonite to reduce the value of soil resistance, so that the resistance value of soil type filled with bentonite is smaller and causes the value of soil resistance to be smaller and suitable for on rocky soil [4].
In the study "Damping Harmonics Distortion Using Active Filters with PID Control at the Faculty of Engineering, Udayana University Bukit Jimbaran" stated that the current harmonic distortion (THDi) on the Bukit Jimbaran campus exceeds the IEEE 519 -2014 standard of> 8% causing poor power quality [5].

Power Installation
The

Grounding System
The grounding system is a circuit network starting from the grounding electrode pole, connecting to the earth terminal which serves to channel more current to the earth, so that the equipment can be protected from the influence of lightning and other foreign stresses [6], [8], [9 ]: Plate electrodes are electrodes of metal plate material (intact or perforated) or from gauze wire mounted perpendicular to the ground [10].

Harmonics
Harmonics arises due to the operation of non-linear electricity loads. The height of harmonics results in poor power quality [12], [13], [14]: Two criteria of harmonics are current harmonic distortion (THDI) and harmonic harmonics (THDV).

Types of Problems of Electric Power Quality
The types of problems in the quality of electrical power are like transient symptoms, namely the symptoms of variable changes (voltage, current and others) that occur during the transition from a state of soft operation (steady state) to another state [12].

Research Location
The study was conducted at the Faculty of Engineering of Udayana Hill University in Jimbaran and the Laboratory of Electrical Installation.        Based on the measurement results of loading data at each phase is not balanced, this will affect the emergence of currents in neutral phases that should not have a current flowing and affect harmonics (THD current or THD voltage that does not meet the standards) so that it can reduce power quality. In addition, the existence of a number of buildings that use 1 panel for 2 buildings will affect the reliability of the two buildings. Then the redesign (re-design) of the system is made. Main installation from existing data to new planning data. The total power of 133.15 A, the type of cable used should be NYY 4x70 mm2 with the ability to conduct current of 228 Ampere in order to anticipate the development of the load going forward with the number of equipment that uses electric power supply, because currently the cable operated is also intended to load in the Department of Architecture building, the cable can still be used to serve the Dean building's burden, so it only needs to install one cable to service the building load of the Department of Architecture. The NFB mother body uses 160 Ampere.

Planning
The total load is 162.33 Ampere, the type of cable used is NYY 4x70 mm2 with NFb 200 Amper safety with the ability of Intensity Flow of 228 Ampere. However, with the imminent addition of Lift, we recommend that you keep using the existing 4 x 95 mm2 NYY cable, but the capacity of the lifter must adjust to the size of the cable, only the NFb master safety adjusts, but still must be below the cable KHA. Total load is 23.39 Amper, Cable used is NYY 4 x 10 mm2 and safety of NFb 60 Ampere. However, the Undagi Graha building in the future planning will be used as a second floor building and will be planned for additional lecture rooms and others, then the existing NYY 4x95 mm2 cable and NFb 200 Amper main safety do not need to be changed. Based on the results of special calculations in the load group, cable size and safety capacity above, it can be concluded that to maintain the quality and reliability of the system there are several things to note are:  While the THD value of the voltage still meets the permitted standard (<5%)

Grounding System
Based on the results of the analysis of the two grounding systems namely the plate and grid system to get an grounding resistance value of <1 ohm it can be recommended that, when using a plate grounding system, the number of plates that need to be planted is 25 sheets with a size of 2 x 1 meter with a depth of planting 2 meter. Whereas when using a grid type earth system, a grid with a size of 3 meters x 3 meters is needed with a total grid conductor length of 2976 meters and a 3 meter installation depth. Undagi Graha building are still relatively far above the capacity according to the analysis, but the two loads on the building will be planned to increase the load so the channel is still operated. 4. Ground resistance to all panels (MDP, DP and SDP) has a very large value (> 1 ohm), so it is very important to make a new grounding system. 5. Based on the THD analysis, the entire phase in each panel as in table 9 does not meet the IEEE 519 -2014 standard, so it is very important to install a filter to reduce the THD current to meet IEEE 519 -2014 standards. 6. To get the earthing resistance value <1 ohm can be used plate type or grid type. When using a plate earthing system, the number of plates that need to be planted is 25 sheets with a size of 2 meters x 1 meter with a depth of 2 meters. Where as when using a grid type grounding system, a grid with a size of 3 meters x 3 meters is needed with a total grid length of 2976 meters and a 3 meter installation depth.

Recommendation
Based on the results of the study can be suggested to do research with the treatment of grouping non-linear loads, namely groups of lights, groups of air conditioning systems and groups of other equipment such as: LCD, computers and others to find out the equipment that most influences the increase in THD . As well as installation research in each group in order to be able to make the overall installation design used for making the final image as a reference in maintenance.