scholarly journals PENGARUH PENYEIMBANGAN BEBAN TRAFO DISTRIBUSI TERHADAP ARUS NETRAL

2013 ◽  
Vol 5 (1) ◽  
pp. 1-8
Author(s):  
Surfa Yondri ◽  
Tri Artono ◽  
Hengki Purnama Sari

Load balancing is load balancing activities in each phase distribution transformers are not balanced, the goal to reduce the magnitude of the neutral current transformer because inequality between phases. This activity was done by measuring each phase transformer load, calculate the average current in each phase, and shifted the burden of heavily loaded phase to phase which has a lot fewer burdens. Load balancing is done on a regular basis every 6 months. PT. PLN (Persero) Rayon Bukittinggi perform load balancing on the distribution transformer substation 100 KVA Distribution Tabek Gadang Tower 2 times on Wednesday, 15th May 2013 at 19:30 pm and Thursday, 16 May 2013 at 19:30 pm. First, by moving the load phase T to phase S at 18 A. Second, by moving the burden from phase to phase R T at 9 A. and load phase T to S phase by 11 A. load balancing distribution transformers 100 KVA Substation Tabek Gadang Tower is near parity with the transformer neutral currents in 14.18 A.

Author(s):  
Hendro Tanamal ◽  
Afriyastuti Herawati ◽  
Novalio Daratha ◽  
Ika Novia Anggraini

ABSTRAKTransformer IV is one of the 20 kV distribution transformers found at the Sukamerindu Bengkulu Substation (GI). The transformer has a power rating of 30 MVA. In distribution transformers, inter-phase load balancing is needed. If the load is not balanced between the phases, current will flow in neutral wire. In this study the effect of unbalanced load on neutral current in transformer IV Sukamerindu Bengkulu is analyzed. The load is analyzed every hour of the day by observing the amount of current and voltage in each phase. From the results of the analysis it was found that the highest neutral current loss value was 1306.25 watts or 1.30 kW and the lowest was 0.724 kW, with an average neutral current loss that occurred in the IV unit transformer Sukamerindu at 639 watts.


2013 ◽  
Vol 325-326 ◽  
pp. 1152-1156
Author(s):  
Dong Liu ◽  
Yong Liu ◽  
Kuo Zhao ◽  
Min Yi Guo ◽  
Hui Zhao ◽  
...  

This paper develops a control device for distribution transformer neutral current and loss caused by unbalanced loads. Due to multi-objective optimization, its control strategy is designed, considering the reliable operation of distribution transformers and its performance. This device can gather power quality parameters, calculate the optimal regulation and control capacitor switching, which consists of power quality acquisition unit, central processing unit (CPU), capacitor control cabinet and power supply. After simulation and experiment, the result shows device can achieve target by dynamic adjustment.


2019 ◽  
Vol 4 (1) ◽  
Author(s):  
Dian Eka Putra ◽  
Randi Kusniriansya

ABSTRAKKetidak seimbangan beban yang terjadi SUTR terletak etidakteraturan pemasangan sambungan rumah (SR) baik satu fasa maupun tiga fasa pada saluran udara tegangan rendah mengakibatkan beban trasformator distribusi LI 146 menjadi tidak merata, hal ini dikarenakan adanya penumpukan beban pada salah satu fasa, sehingga beban saluran tidak seimbang. Ketidakseimbangan beban menyebabkan menyebabkan terjadinya lossesdaya listrik pada jaringan penghantar netral.Diawali dengan pengukuran setiap fasa SUTR maka didapat lapangan fasa R yang terbesar dengan Arus 41 Amperedan fasa T Arus terkecil sebesar 12.2 A, akibat dari perbedaan yang besar antar fasa minimbulakan arus sebesar 35,5 A. Maka diperlukananalisa perbaikan dilapangan untuk mengurangi besarnya arus netral dan loses yang terjadi maka dilakukan pemerataan beban dengan jalan perbaikan sambungan konduktordan pemindahan disetiap penghantar fasa pada beban berupa sambungan rumah (SR) dan beban lainya lampu penerangan jalan, dari jaringan fasa yang besar ke penghantar fasa yang lebih kecil.penelitian inididapatnilai besar arus netral dan rugi-rugi (losses)penghantar netral sebelum dan setelah dilakukan pemerataan beban saluran udara tegangan rendah (SUTR). Pengukuran dan perhitungan dilakukan pada luar waktu beban puncaktransformator distribusi pada gardu distribusi LI 146 di PT PLN (Persero) ULP Muara Beliti.Berdasarkan hasil perhitungan besar arus netral sebelum dilakukan pemerataan beban yaitu 35,5 A dan rugi-rugi yang terjadi akibat arus netral sebesar 2,265 kW. Namun setelah dilakukan pemerataan beban, besar arus netral berkurang menjadi 24,2 Adikarenakan arus netral berkurang maka rugi-rugi pada penghantar netral ikut berkurang menjadi 0,97 kW. Hal ini berarti bahwa program pemerataan beban dapat meminimalisir besar arus dan rugi-rugi daya (losses) yang timbul disaluran penghantar netral transformator distribusi LI 146.Kata kunci : Ketidakseimbangan beban, Transformator LI 146, Pemerataan beban saluran.ABSTRACThe load imbalance that occurs in SUTR lies in the irregularity of the installation of house connections (SR) both one phase and three phases in the low voltage air ducts causing the distribution load transformer LI 146 to be uneven, this is due to a buildup of load on one phase, so that the load is not balanced. The unbalance of load causes electrical power losses in the neutral conductor network. Beginning with the measurement of each phase of the SUTR, the largest phase R is obtained with a current of 41 Amperedan and T phase The smallest current of 12.2 A, due to a large difference between the phase minimbulakan currents of 35.5 A. Therefore, it is necessary to analyze the improvement in the field to reduce the amount of neutral current and loses that occur then the load equalization is carried out by repairing conductor connections and displacement in each phase conductor at loads in the form of house connections (SR) and other loads of street lighting, from large phase networks to conductors smaller phase. this research can be a large value of neutral current and neutral conductor losses before and after the equalization of low voltage air line loads (SUTR). Measurements and calculations are carried out outside the load time of the distribution transformer at the LI 146 distribution substation at PT PLN (Persero) ULP Muara Beliti. Based on the results of the calculation of neutral currents before equalization of the load ie 35.5 A and the losses incurred due to neutral currents of 2,265 kW. However, after the load is equalized, the neutral current is reduced to 24.2 Adik. Since the neutral current is reduced, the losses on neutral conductors also decrease to 0.97 kW. This means that the load equalization program can minimize the amount of current and power losses that arise in the distribution channel neutral distribution transformer LI 146.Keyword :  Load imbalance, Transformer LI 146, Channel load equalization


Author(s):  
Arfita Yuana Dewi ◽  
Asnal Effendi ◽  
Fahody M Syafar

The Power distribution in a 3-phase system, cannot be separated from the flow of current in the neutral of the transformer, which will cause power losses (losses) where current flows into the neutral conductor and losses that flow into the neutral conductor. This study was conducted to determine the causes and magnitude of power losses that occur due to the occurrence of neutral current flowing in the neutral conductor in a 160kVA distribution transformer. The research location taken is the Distribution Transformer (G187 T) which is located on Jl. Hos Cokroaminoto Wisma Ombilin where load imbalances often occur. From the results, it can be seen that if the neutral wire has a cross-sectional size of 50 mm2, the current that passes through the neutral wire is 6.4% for the day and for the cross-sectional size of the wire is 70 mm2, it can reduce the power flowing to the neutral by a percentage of 4.77%. for the daytime. Efficiency value that occurs is greater at night that is 94.87% while for the day it is 93.44%. For the distribution of each - each phase, especially the S phase, so that it can be balanced because the power supplied to the S phase is too small. We recommend that the current flowing in the neutral wire must be channeled to the ground so that the current flowing in the neutral wire becomes zero.


Energies ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1215
Author(s):  
Alvaro Carreno ◽  
Marcelo Perez ◽  
Carlos Baier ◽  
Alex Huang ◽  
Sanjay Rajendran ◽  
...  

Distribution systems are under constant stress due to their highly variable operating conditions, which jeopardize distribution transformers and lines, degrading the end-user service. Due to transformer regulation, variable loads can generate voltage profiles out of the acceptable bands recommended by grid codes, affecting the quality of service. At the same time, nonlinear loads, such as diode bridge rectifiers without power factor correction systems, generate nonlinear currents that affect the distribution transformer operation, reducing its lifetime. Variable loads can be commonly found at domiciliary levels due to the random operation of home appliances, but recently also due to electric vehicle charging stations, where the distribution transformer can cyclically vary between no-load, rated and overrated load. Thus, the distribution transformer can not safely operate under highly-dynamic and stressful conditions, requiring the support of alternative systems. Among the existing solutions, hybrid transformers, which are composed of a conventional transformer and a power converter, are an interesting alternative to cope with several power quality problems. This article is a review of the available literature about hybrid distribution transformers.


2013 ◽  
Vol 7 (12) ◽  
Author(s):  
Mihail Digalovski ◽  
Krste Najdenkoski ◽  
Goran Rafajlovski

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