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Prahastono, Iswan
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Mechanical Engineering

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Kajian Potensi Peningkatan Daya Terpasang PLTA Sebagai Pemanfaatan Surplus Debit Air Unit PLTA Batang Agam Kurniawan, Elfin; Hakam, Dzikri Firmansyah; Prahastono, Iswan; Nainggolan, Akiman
ROTASI Vol 23, No 1 (2021): VOLUME 23, NOMOR 1, JANUARI 2021
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.23.1.32-38

Abstract

Batang Agam hydro Power Plant is a run of river hydro Power Plant which operated in 1976 with initially 2 (two) generation units operation. In 1981, the Batang Agam hydro Power Plant experienced 1 (one) unit expansion, resulted in total capacity of 3 x 3,5 MW. Based on the analysis carried out by the author, we found that there are potential for additional generating power from the existing river flow. This analysis based on 3 (three) types of studies, namely the study of excess inlet water discharge (inflow) at the overflow point in the tando pond spillway, the study of excess inflow at the overflow point in the spillway sand pond, and the study of water savings from modification of the tando pond screen outlet. Moreover, this research conducts a study on the capacity of additional units and the capacity of the existing waterway to determine the durability of the infrastructure. Based on the study results, an inflow surplus of 2,58 m3/s was obtained with a potential additional unit capacity of 2 MW. After more than 40 years of operation, the main hydropower facilities experience several modifications in the intake and the tando pond. We identified the potential to increase the installed power capacity of the Batang Agam Hydroelectric Power Plant by utilizing the surplus water in the tando and sand pond. The utilization of this water surplus can convert hydro energy into electrical energy that produce an additional 1 x 2 MW generator unit. This research provides a beneficial to PLN in increasing power supply to the interconnection system without land acquisition by utilizing the existing waterway.
Pengaruh Penambahan Zat Aditif Pada Pengecoran Beton Joint Pit SKTT 150 kV Sario – Teling Fitrianto, Andrian Juli; Hakam, Dzikri Firmansyah; Prahastono, Iswan; Nainggolan, Akiman
ROTASI Vol 23, No 1 (2021): VOLUME 23, NOMOR 1, JANUARI 2021
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.23.1.39-49

Abstract

The construction of a 150 kV Sario - Teling High Voltage Cable Line (SKTT), which located in the city of Manado - North Sulawesi Province, is an important electricity project that has been planned to operate in 2020 according to the 2019-2028 Rencana Umum Penyediaan Tenaga Listrik (RUPTL). This transmission line construction is expected to increase electrical energy services in North Sulawesi region. This SKTT project applied the Boring Horizontal Directional Drilling (HDD) method to install the 150 kV SKTT cable. On the other hand, the Joint Pit installation uses a Box Culvert precast construction consisting of reinforced concrete.From the test results of the samples, we can conclude that there were an increases in the compressive strength of concrete from 1,04% to 1,27% above the compressive strength of normal concrete. There was a decrease in the compressive strength of the concrete at several points. However, this anomaly is still above the minimum limit of concrete compressive strength determined by PLN, which is 400 kg / cm2.This study involved laboratory testing to determine the effect of additives added during Box Culvert casting in order to obtain an efficient hardening time. It is hoped that this study will have an impact on the completion of the SKTT 150 kV Sario - Teling project on time, so that it can provide economic benefits for PLN and the consumer.
Kajian Alternatif Metode Kerja Perbaikan Trashrack (Saringan) Intake Malalo Unit PLTA Singkarak Kurniawan, Elfin; Simaremare, Arionmaro Asi; Prahastono, Iswan; Nainggolan, Akiman
ROTASI Vol 23, No 4 (2021): VOLUME 23, NOMOR 4, OKTOBER 2021
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.23.4.18-27

Abstract

The Singkarak Hydroelectric Power Plant with a capacity of 175MW is the backbone of the Central Sumatra Subsystem (SumBagTeng) in the Sumatran electricity interconnection system so that the reliability of the Singkarak hydropower operation must be maintained. However, after more than 12 years of operation the Singkarak Hydroelectric Power Plant suffered damage to the trash rack of the Malalo Intake caused by the September 30, 2009 earthquake that hit Padang-Pariaman where the filter segments and the filter girder beam fell to the bottom of the intake. This results in waste originating from Singkarak lake being free to enter the head race tunnel and then to the generator engine generator which can interfere with the operation of the Singkarak hydropower plant so it is necessary to repair the Malalo trashrack intake.This study aims to evaluate several alternative work methods for repairing the trash-rack intake of Malalo PLTA Singkarak to minimize disruption to the operation of PLTA Singkarak during repairs. Three alternative improvement methods were evaluated using the Zero-One technique and weighting. From the results of the evaluation, it was found that the underwater construction work method is the best alternative to repair among other methods. Furthermore, the details of the implementation plan for the underwater construction work method are presented as a reference for the implementation of the repair PLTA Singkarak trash rack.
Co-Authors Dzikri Firmansyah Hakam Fitrianto, Andrian Juli Kurniawan, Elfin Nainggolan, Akiman Simaremare, Arionmaro Asi