Waluyo, Waluyo and Fahdiyalhaq, Aulia Nur and Saodah, Siti (2017) Calculation Analysis of Power Losses on the Medium Voltage Feeders and Distribution Transformers. International Journal of Applied Engineering Research, 12 (14). pp. 4264-4281. ISSN 0973-4562

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Abstract

With the increasing electric power demand, the power losses will also rise. Thus, its losses are need to be calculated accurately and become one of most important things that need to be considered in the expansion of electrical line. This research served the method to calculate the power losses in medium voltage power distribution 20 kV includes with the result according to the load curve in every distribution transformer. The losses on the medium voltage line were calculated according to the current in the line, and the losses in transformer were calculated according to the loads those change every time. The calculated sample of feeder was taken from the power substation focused on UZB line. The loss calculations were also used by using the simulation, so that the calculations could be compared each other. The loss result in the transformers had the biggest one, that was 5% of transformer capacity, and the biggest power loss in transformers was occurred in ALTA distribution transformer, as 5.8005% and the lowest was occurred in GKSI distribution transformer, as 0.3158%. Thus, the result could be considered to plan the electrical power distribution because they had some impact in investment. Keywords: power loss, energy loss, medium voltage feeder, distribution transformer, distribution transformer reliability of system and lead to blackouts when the system reliability is not proper, so that the consumers will feel be aggrieved. To overcome this case, the system must expand the distribution network, and one of the criteria that must be met, such as high efficiency, without ignoring the economic aspect. The high efficiency will be achieved if the energy loss can be minimized. Currently, the company is expanding the distribution network system to improve the service needs due to increasing load, the losses that occur in the network distribution system must be taken into consideration, both in planning and in operation. It will affect the cost of investment. By knowing the power loss, an enabling research was carried out on the possibility of additional investments to reduce the losses. On the basis for the ideas, it was intended to conduct the research on power losses in the distribution network system. Therefore, it was captured the calculation analysis of power losses in the feeder on the medium voltage side, including the distribution transformers.

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