Study of The Electric Field Between Horizontal and Vertical Configuration Pole under 150 KV High Voltage Transmission Line ( SUTT 150 KV )

Distribution of electrical energy from a plant to a substation or from a substation to other substations usually uses a transmission line. In Bali, type of transmission line that is usually implemented is SUTT 150 kV. The magnitude of the applied voltage is an attempt to reduce power loss for long distance distribution. However, distributing electrical energy with increasing stress affects the increase of electric field around the transmission line. The negative impact of electricity distribution has been an environmental problem for PT. PLN (Persero), especially where there is conversion from an open area to be a residential. This problem has been the main reason for conducting this research. IRPA / INIRC recommendation states that exposure time is not limited to the electric field effect in work environment and public area including a residential area at frequency of 50/60 Hz is 5 kV/m. This recommendation is in accordance with SNI 04-6950-2003, on Threshold Limit Values Electric Field under SUTT and high-voltage wires. The first problem of this research is how large the intensity of the electric field between two poles of SUTT 150 kV with vertical and horizontal constructions which are built side by side? The second problem is what the characteristic of the electric field intensity between the two poles which are built side by side? From the analysis, it can be seen that the intensity of the electric field that occurs between the conductor of the vertical and horizontal pole configurations are still below the IRPA/INIRC and SNI 04-6950-2003 recommendation i.e. 1 up to 1.5 kV/m and at a distance of 18 meters to 25 meters there is an interaction of electric field intensity that occurs at these two configurations. Index Terms — Electric Field Intensity, The Value of Threshold Electric Field, SUTT 150 kV, Vertical Configuration, Horizontal Configuration

I. INTRODUCTION 1 Distribution of electricity from plants to substations requires long transmission line, where it can increase power losses. One solution to overcome this problem is by increasing the voltage in transmission line to become high voltage of 150 kV or even more to become 500 kV. This solution is based on concept that by increasing voltage it causes electric current that flows in transmission line to become smaller, where therefore losses is also small.
Distribution of 150 kV high voltage or 500 kV ultra high voltage supplies negative impact for environment due to the construction of electric field around transmission line. This negative impact is an indirect effect from the electric field, which influences psychological aspects such as fear, environmental comfort like closing electromagnetic radiation, or effect caused by touching stuffs containing electricity. These facts have been environmental problems for PT. PLN "Saluran Udara Tegangan Tinggi" (SUTT) and Extra High Voltage Transmission Line i.e. "Saluran Udara Tegangan Ekstra Tinggi" (SUTET).
There are many studies in term of electric and magnetic field intensity. For instance, (Suwitno and Fri Murdiyah, 2010) studied intensity of electric and magnetic field threshod of SUTT 150 kV in transmission line that traverses Kampar and Pekanbaru regency. The results of their research state that for the magnetic and electric field intensity, they obtained result of 0,00009 Tesla and 70 V/m repectively, which are both still below threshold. Other schoolar, (Syafril Ramadan and Hendra Zulkarnain, 2013) examined electric field intensity under 150 kV transmission line between Titi Kuning Substation and Berastagi Substation. This researher also produced results below the defining threshold. Furthermore, there is also study about electric field intensity under 150 kV transmission line on vertical pole configuration. Study in 11 points conducted by (M.S. Ugustra, A.A.N.Amrita, and I.G.N. Janardana, 2014) shows result that the highest electric field occurs in point number 6 that is directly below the transmission line. The value is also below the electric field intensity threshold. After the study in vertical configuration, there is also reference that discusses horizontal configuration conducted by (I.P.H. Wahyudi, A.A.N.Amrita, W.G. Ariastina, 2014). In this study,7 points were examined, where the results show that the highest electric field intensity that is still below threshold, occur in points number 2 and 6, which are drectly below phase R and T of the transmission line. Other than these references there are also studies related to electric field intensity. (I.G.N. Adi Kurniawan, A.A.N.Amrita, I N. Budiastra, 2015) for instance. These people studied electric field intensity under 150 kV with horizontal configuration in settlement area. Results of this study is a recommendation for building elevation in some points that are traversed by the 150 kV line in order to maintain the electric field below the threshold. Other result of this study is that they do not recommend to build terraced houses in the cable arch of transmission line. The last reference stated here is study by (I.N.Y. Prayoga, A.A.N. Amrita, C.G.I.Partha, 2015) which studied electric field intensity under 150 kV with vertical configuration in settlement area. This study also recommends not to build terraced houses in the cable arch of transmission line.
Based on these studies, in this research we examined electric field intensity under SUTT 150 kV between poles of vertical and horizontal configurations. This topic arises due to the facts that the cange of open area to become settlement area to make many building positioned below the vertical and horizontal configuration in the same place.
II. RESEARCH METHODOLOGY Figure 1 shows the flowchart of this research. Measurement is done through two stages: 1) measurement of conductor high from vertical and horizontal poles by using klinometer, and 2) measurement of electric field by using AC Electric Field Meter.    No.