Pola Hubungan Patron- Klien pada Komunitas Nelayan di Kelurahan Malabro Kecamatan Teluk Segara Kota Bengkulu

This research aimed to describe the characteristic of fishing activities in Malabro Municipal, Teluk Segara District, Bengkulu city and to describe the pattern of patron- client relationship between wholesaler, vessel owner and fishermen. This researh conducted using qualitative method. Data collected using obsevation, interview, and documantes information related to this research. Thi result shows that fishermen are using three fishing tools, such as gillnets, payang and trammel nets. These fishing tools will be influence many things like type of vessel, amount of fishermen, and production sharing system. In patron-client relations between wholesaler and boat owner. Wholesaler has a role as patron and the boat owner has a role as client. Patron-client relation is mutual benefit. While, relation between wholesaler or vessel owner and fishermen hasn't shown patron- client relationship but only shown relation of fishing activities

Electromagnetic interference shielding in unmanned aerial vehicle against lightning strike

Electromagnetic interference (EMI) due to lightning strike in Unmanned Aerial Vehicle (UAV) became a critical issue, since it could cause a severe damaged to electronic equipment which was installed in UAV. This paper proposed a method to reduce EMI by creating shield over the body of UAV with aluminum foil with thickness 0.15mm. A standard lightning impulse-voltage generated by impulse generator was delivered to the high voltage (HV) electrode at a particular distance from UAV. Indirect effect of lightning strike was investigated by measuring induced voltage inside the compartment of UAV fuselage during flashover between the HV electrode and UAV. Flashover between the HV electrode and UAV simulated the lightning strike. The result showed that the highest voltage only 1V at UAV compartment when 150kV impulse voltage supplied to the electrode with striking area on the wing. The measured voltage was far below 100V as the insulation level of low voltage equipment inside UAV. Although the direct effect of lightning has created a burning hole on the surface aluminum foil with thickness 0.15mm, the effect was overcome by increasing the thickness to 0.3mm. The application of aluminum foil over the surface of UAV repelled the electromagnetic interference which acted as a Faraday cage. The shielding method was successfully reduced the effect of EMI

Respons Impuls Pada Elektroda Pentanahan Batang Tunggal Untuk Menentukan Nilai Impedansi Pentanahan

A good grounding system belived if the its resistance has a small value that measured with DC source or low frquency. Meanwhile, lightning stroke that caused impulse current with high frequency up to kHz, so when gounding system work when striking by lightning, its impedance not only mark out by resisftif component but also will affected by induktif and capasitif value. In this paper discussed impedance of grounding system for driven rod that burried with varying dept from 2 to 6 meter. Then impulse injected to imitate lightning stroke as a voltage source with high frequency. From measurement and calculation result it’s shows that the lowest grounding system was 23,01 Ω when the dept of driven rod 6 m and grounding impedance decrease abut 5.25 Ω pe meter. Experiment result compare with simulasion using EMTP. EMTP model for driven rod using a R-L-C model. The result shows the magnitude of voltage and current for both experiment and simulation have a good correspondingly, but response for simulation has a far farter tail time impulse. Keyword: impulse response, grounding impedance, driven rod groundin

Pola Peluahan Parsial (Partial Discharge-PD) Pada Bahan Isolasi Epoxy Resin

High voltage insulation failure that led to the breakdown of events is crucial reliability of a power system Most of the failure of the insulation caused by the presence of PD activity on the insulation material, especially the solid insulation which triggering the growing of electrics tree. To anticipate these problems required an understanding of the characteristics and patterns that occur in PD insulating material. Activities Partial Discharge (PD) which occur in epoxy resin insulating materials will discussed in this research. Partial discharge pattern happens to be analyzed, the characteristics of PD that occurred (n), the maximum pulse peluahan PD (q) and angle of discharge of the PD pulse ( ). In this research, Electrodes used is a needle-plate electrode. The data processing obtained from the research, analyzed using the Mathlab software, namely De-noising 1-D Wavelet toolbox. Keywords: Partial discharge pattern, Epoxy Resi

Analisis Karakteristik Gangguan Hubung Singkat Antar Belitan Transformator Menggunakan Transformasi Wavelet Diskrit

Transient fault could occur on transformer in power system. This is could be because of internal fault or external fault. Disturbance could be because of short circuit between winding of transformer or because of short circuit on load. Short circuit on transformer winding could lead to catastrophic failure of transformer. So it’s needed to detect short circuit between winding on transformer before it breakdown. On this paper discussed experiment using a step transformer 220/500 volt with 5 tap on primer side and 10 tap on secondary side. Each tap on primary and secondary side is connected to simulated short circuit evidence in transformer winding. The transformer connected to resistif load that have 10 tap to simulated short circuit on load side. Measurements conduct on both side and analysis done using wavelet transformation analysis. Experiment result shows measurement result on secondary side gave wavelet decomposition that easier to discriminate fault result from normal condition. Fault condition could be known from spike that’s occurs on wavelet decomposition. Keywords : wavelet transformation, short circuit fault, wavelet decompositio

Teknik Menjual Yang Efektif

+147hlm.;24c

Teknik menjual yang efektif

+147hlm.;24c