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Articles 313 Documents
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POWER QUALITY ANALYSIS AT BUILDING OF POLITEKNIK NEGERI AMBON LORY MARCUS PARERA; MARCEAU. A.F HAURISSA; MARSELIN JAMLAY
INTERNATIONAL JOURNAL OF MULTI SCIENCE Vol. 3 No. 01 (2022): INTERNATIONAL JOURNAL OF MULTISCIENCE - MAY 2022 EDITION
Publisher : CV KULTURA DIGITAL MEDIA

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Abstract

Power quality determines the reliability of electrical energy transmission which reflects the parameters of voltage, frequency, frequency, balance, and waveform. Electrical quality in a building is required due to abnormal effects on current, voltage, and frequency. By measuring it can be seen whether or not the abnormal electrical quality in the Ambon State Polytechnic's electrical system. The method used is data collection through literature study and observation of research locations, as well as descriptive analysis with a statistical approach. The Ambon State Polytechnic receives electricity from a power plant with a three-phase wire system. The load is supplied by a 3-phase transformer 20 kV/380 V With a power capacity of 250 kVA. carried out using a Power Analyzer where the tool for one day (24 hours) records electrical data for Polnam testing. Through tabulation and data analysis, there are several facts that there are abnormal conditions both in voltage, current, and frequency because the magnitude is outside the set standard. The results of the recommendation of the need for interference estimation begin with the selection of the right method.
DESIGN OF ATS (AUTOMATIC TRANSFER SWITCH) SYSTEM BY INTEGRATING PLC (PROGRAMMABLE LOGIC CONTROLLER) AND INVERTER MARCEAU A.F HAURISSA; MARSELIN JAMLAAY
INTERNATIONAL JOURNAL OF MULTI SCIENCE Vol. 3 No. 04 (2023): INTERNATIONAL JOURNAL OF MULTISCIENCE - JANUARY-APRIL 2023
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Abstract

Continuous and reliable electricity cannot be ensured to be available at all times. Therefore, to meet the needs of electrical energy continuity, backup or alternative sources of electrical energy are also utilized such as generators. Genset as a backup energy source will replace the function of PLN electricity which is the main energy source. Switching from PLN electricity to generators or vice versa requires equipment to regulate it known as ATS, but conventional ATS responds when there is a change in the electrical system usually has a generator starting time lag (up to 30 seconds). This is certainly detrimental to users who need a continuous source of electricity, such as shop cash registers. In this research, an ATS panel is built with the integration of PLC and inverter control. PLC will replace the limitations of relays and timers as controllers with simple wiring and programmable logic circuits as needed. The ATS system built is able to switch the inverter load in approximately less than 0.05 seconds when the PLN power source goes off and is able to run the generator on the first start to supply power to the main load as well as switching the inverter load to the main load supplied directly from the generator. So that lighting or other loads can be maintained in the order of a long time for the generator starting process or until the generator repair conditions if it fails to start.
SIMULATION OF UNCONTROLLED HALF-WAVE RECTIFIER USING SIMULINK MATLAB VICKY SALAMENA
INTERNATIONAL JOURNAL OF MULTI SCIENCE Vol. 1 No. 08 (2020): INTERNATIONAL JOURNAL OF MULTISCIENCE - NOVEMBER EDITION
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Abstract

This research utilizes the features of the simulink-matlab program to analyze the characteristics of a single-phase uncontrolled half-wave rectifier.The rectifier circuit is built using the existing facilities in the simulink in the matlab program, then performs the simulation process by running the simulink program so as to produce the input and output voltage and current curves of the rectifier. The curve is displayed by the socpe window which can also display the values of these quantities. The waveforms and current values of the simulation results will be compared with the results of theoretical calculations, so that the compatibility of the simulation and theoretical values can be known. These values are the output voltage and current of the rectifier, namely the average voltage (DC) and the effective voltage (rms). The simulation results of the simulink-matlab program can display the rectifier output waveform, namely the output voltage and the output current as well as the rectifier input voltage and current ( and ), and can also display the parameters of the rectifier output waveform, namely the maximum and minimum peak values, both values the peak value can be calculated the average voltage (DC) and effective voltage (rms) as the supply voltage to the load and can display the rectifier output current characteristic curve based on the current equation. From the results of the discussion there is a difference between the results of theoretical calculations and the results of calculations using the simulation results parameters in the simulink-matlab program, this is due to the presence of diode parameters that are also included in the simulation process. By using the matlab-simulink feature, the diode characteristics can be adjusted according to the specifications, as well as the rectifier characteristics with freewheeling diodes.
EVALUATION OF DISTRIBUTION TRANSFORMER LOADING ON THE AMBON CITY EXPRESS REPEATER SOLEMAN SESA; JOHANIS TUPALESSY
INTERNATIONAL JOURNAL OF MULTI SCIENCE Vol. 2 No. 07 (2021): INTERNATIONAL JOURNAL OF MULTISCIENCE -OCTOBER EDITION
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Abstract

Power system distribution, reliability and stability of the system is very important in order to provide convenience in service to consumers. This can be fulfilled by paying attention to the condition of the existing power equipment. One of the most important equipment in power system operation is transformer. Distribution transformers will work optimally if the electrical load carried in the transformer network area does not exceed the capacity of the distribution transformer. When there is an overload on a transformer, the insulation inside the transformer becomes overheated due to the current loaded on the transformer is very large or exceeds the nominal current of the transformer. The solution to overcome the overload on the transformer is if the location between transformers is far apart, it can be done by inserting the transformer by referring to the transformer rating that will supply the load. If the load supplied by the transformer on the network is getting bigger, then a transformer with a large capacity is used to supply the large load, otherwise the transformer will experience an over load which can cause the transformer to trip. At the KTAEXK007 and KTAEXK009 substations, both load shifting is carried out to one of the nearest transformers, namely the KTAEXK008 Amans Hotel substation. Then in the existing calculations, there are two transformers that will be used for transformer insertion, namely a transformer with a rating of 315 kVA and a 100 kVA transformer.
THE EFFECT OF ECONOMIC GROWTH AND LABOUR ABSORPTION ON POVERTY RATE IN MALUKU PROVINCE 2007-2021 SHERLY FERDINANDUS; VENTJE JEFFRY KUHUPARUW
INTERNATIONAL JOURNAL OF MULTI SCIENCE Vol. 3 No. 04 (2023): INTERNATIONAL JOURNAL OF MULTISCIENCE - JANUARY-APRIL 2023
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Abstract

This study aims to analyse: The Effect of Economic Growth on Poverty Level in Maluku Province; The Effect of Labour Absorption on Poverty Level in Maluku Province; The Effect of Economic Growth and Labour Absorption on Poverty Level in Maluku Province This study uses time series data. Which starts from 2007 to 2021. Data analysis uses multiple regression analysis. The results showed that partially and simultaneously economic growth and labour absorption had an influence on the poverty rate in Maluku Province.
ANALYSIS OF VOLTAGE DROP IN LOW VOLTAGE NETWORK DISTRIBUTION SYSTEM IN TANTUI UP SUBSTATION KTATNT013 AMBON SEFNATH J WATTIMENA
INTERNATIONAL JOURNAL OF MULTI SCIENCE Vol. 2 No. 12 (2022): INTERNATIONAL JOURNAL OF MULTISCIENCE - MARCH 2022 EDITION
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Abstract

The Low Voltage Network Distribution System to the House Connection is the end of the electrical energy service to consumers. A good service portrait can be seen from the quality of the voltage. The nominal value of the voltage must comply with the standards contained in SPLN 1: 1995, namely +5%; -10%. This research uses quantitative analysis research method. The research stage starts from data collection, calculation, analysis, and solution offering. Substation KTATNT013 Department A whose network end is in Kampung Kolam experienced a measured voltage drop of up to 131V at the end house, which has exceeded the SPLN tolerance limit. As a result, some consumer electrical appliances cannot function properly. To overcome this problem, an improvement solution is offered as well as the calculation of voltage drop before and after. The solution in the form of conductor uprating and network reconfiguration reduced the voltage drop from 96.05V (42.40%) to 27.43V (12.11%), while the transformer insertion solution reduced the voltage drop to 14.26 V (6.29%) on the existing transformer Low Voltage Network and 8.3V (3.77%) on the inserted transforme
DISCOURSE OF COMMUNICATION PERSPECTIVE IN BEHAVIORAL ACCOUNTING ON BUDGET DESIGN IN A CORPORATION MIS FERTYNO SITUMEANG
INTERNATIONAL JOURNAL OF MULTI SCIENCE Vol. 3 No. 04 (2023): INTERNATIONAL JOURNAL OF MULTISCIENCE - JANUARY-APRIL 2023
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This paper aims to discuss how behavioral accounting is becoming increasingly strategic in the budget planning of a corporation or organization. This study is a qualitative reflection with a literature study approach. Data is drawn from jurbal texts, books, electronic sources, digital sources, and other relevant source variants. The data are categorized into two main dimensions, namely communication behavior in budget design and communication in budget implementation. The results of the theoretical study show that the budget is one of the managerial tools used to plan, control and ensure the achievement of entity goals. However, it cannot be denied that the budget is a technical process that involves the role of individuals so that it allows for dysfunctional behavior that is born from the opportunistic attitude of the agent.
MONITORING LOAD IMBALANCE IN DISTRIBUTION TRANSFORMER PT. PLN ULP TULEHU BASED ON THE INTERNET OF THINGS (IOT) ARI PERMANA; SOLEMAN SESA
INTERNATIONAL JOURNAL OF MULTI SCIENCE Vol. 2 No. 10 (2022): INTERNATIONAL JOURNAL OF MULTISCIENCE - JANUARY, 2022 EDITION
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Abstract

Distribution transformer maintenance is an important thing to keep the transformer operating optimally, one of which is by monitoring load imbalance and overload on the distribution transformer. Load imbalance is a condition where the electrical loads connected to each phase of the distribution transformer are not the same size. At PT PLN ULP Tulehu, the transformer load measurement activities are still carried out manually, the tool used by officers in measuring the distribution transformer load is ampere pliers and is carried out once every six months. This shows that substation load monitoring is still done manually or not in Real Time so that monitoring results cannot be monitored in a short span of time. As a result, disturbances in the transformer cannot be known early on. The location of transformers that are scattered in various locations can also be an obstacle for officers to be able to measure loads on time, allowing the risk of transformers being damaged more. This research aims to assist officers in monitoring imbalances and overloads on distribution transformers remotely. The monitoring tool uses the Pzem-016T sensor by measuring electrical parameters such as current, voltage, frequency, load imbalance presentation and used load presentation then the measurement data is monitored in the Blynk application. The test results show that the monitoring equipment is able to work well to read the condition of load imbalance and transformer used load remotely. This monitoring tool has a deviation value (error) of the design measuring instrument against the standard measuring instrument is 0.68% for R-N voltage (volts), 0.76% for S-N voltage (volts), 0.15% for T-N voltage (volts), 0.38% for IR current (amperes), 0.52% for IS current (amperes), 0.81% for IT current (amperes)
CONCRETE MIX ANALYSIS WITH VOLUME RATIO AND OBSERVATION OF MEDIUM STRENGTH CONCRETE CHARACTERISTICS IN THE CONSTRUCTION OF MIPA FACULTY BUILDING PATTIMURA UNIVERSITY ABRAHAM TUANAKOTTA
INTERNATIONAL JOURNAL OF MULTI SCIENCE Vol. 1 No. 07 (2020): INTERNATIONAL JOURNAL OF MULTISCIENCE -OCTOBER EDITION
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Abstract

The need for concrete in a project is not only in large volumes, but also in small volumes. In large volumes, the fulfillment of concrete needs in a project can be done by ordering to concrete suppliers in the form of readymix concrete. Concrete batching plants are used for concrete production of all kinds of projects such as roads, bridges, dams, airports, airports, etc. They can be equipped with one mixer or more in various capacities. The concrete mixes in the project with a volume ratio of 1:1.5:2.5 (cement: sand: crushed stone) with FAS values (0.43-0.47) for concrete quality ranging from K250 - K300. Based on this, this research aims to get the composition of the concrete mixture using a volume ratio for different FAS values and get its compressive strength. The method used in this research is the experimental method, namely planning the composition of the concrete mixture with a volume ratio of 1: 1.5: 2.5 (cement: sand: crushed stone) with FAS values (0.43-0.47) testing the compressive strength of the concrete cube test samples. With the results of the concrete compressive strength test for FAS 0.43, namely 270.525 Kg / cm³ and for FAS 0.47, namely 264 Kg / cm³.
CHANGES IN LAND COVER AND TOTAL AREA OF MANGROVE DAMAGE FOR 10 YEARS FROM 2012 TO 2022 IN BUNATI VILLAGE, ANGSANA DISTRICT, TANAH BUMBU REGENCY IRA PUSPITA DEWI; NURSALAM; SITI FATIMAH
INTERNATIONAL JOURNAL OF MULTI SCIENCE Vol. 3 No. 04 (2023): INTERNATIONAL JOURNAL OF MULTISCIENCE - JANUARY-APRIL 2023
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Abstract

Mangrove is a forest that grows on the coast, generally found in protected estuaries, river banks, and lagoons in subtropical and tropical regions. Mangroves describe ecosystems and plant families that can adapt to an environment influenced by tides. The condition of the mangroves in Bunati Village is quite apprehensive due to the conversion of mangrove land to other land uses such as oil palm plantations, industrial mining excavations, and others, seen from Google Earth images for 2013 and 2022, causing mangrove land cover in Bunati Village to decrease. Therefore it is necessary to analyze changes in land cover and the total area of mangrove damage for ten years from 2012 to 2022 in Bunati Village, Angsana District, Tanah Bumbu Regency, South Kalimantan Province. This study uses Sentinel 2 Satellite Image data for 2022, SPOT 7 for 2017, and SPOT 4 for 2012. The data analysis carried out is overlay. Changes in land cover in 2012 and 2022 in Bunati Village, namely mangrove land remaining to become mangroves covering an area of 73.48 hectares with a percentage of 39.88%, mangroves to non-mangrove 108.99 hectares with a percentage of 59.00%, mangroves to waters 2.05 hectares with a percentage of 1.12%, non-mangrove to mangrove 29.84 hectares with a percentage of 2.81%, non-mangrove to remain non-mangrove 1029.27 hectares with a percentage of 97.02%, non-mangrove to waters 1.79 hectares with a percentage 0.17%, waters turned into mangroves 6.67 hectares with a percentage of 47.14%, waters turned non-mangrove 5.43 hectares with a percentage of 38.35%, and waters turned into waters 2.21 hectares with a percentage of 14.51%. The total area of mangroves that have suffered damage or shrinkage is 74.74 hectares.

Page 22 of 32 | Total Record : 313

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