scholarly journals Pelatihan Penyambungan Kabel Tegangan Menengah 20 KV

2021 ◽  
Vol 2 (1) ◽  
pp. 8-14
Author(s):  
Syafriyudin Abubakar ◽  
Keyword(s):  
Service Life ◽  
Electric Power ◽  
Short Circuit ◽  
Electrical Energy ◽  
Electric Power System ◽  
Electricity Sector ◽  
Insulation Material ◽  
Electrical System ◽  
Insulation Failure ◽  
The Right

A reliable electric power system is needed in distributing electrical energy to customers, in the process of distributing electrical energy, interference in its distribution cannot be avoided, in general, electrical disturbances occur in underground channels, disturbance areas that are prone to and often occur usually at cable connections (Jointing). On cables that are insulated, the emergence of heat is something that must be considered. The current capacity of a cable is influenced by the characteristics of the cable components. Overheating will damage the insulation material and reduce the service life of the cable. The connection process must use the right and correct equipment and materials, to avoid insulation failure in the connection due to excessive heating on the connection which will result in a short circuit which will result in a shutdown of the electrical system. Increasing the skills of workers in the electricity sector is needed to reduce the risk of failure in the electrical system. Key words: cable jointing, insulation failure, skills

scholarly journals Influence of Oil-Filled Transformers Overload Capacity on the Throughput Capacity of the Electrical Network

2018 ◽  
Vol 61 (4) ◽  
pp. 310-320
Author(s):  
V. A. Anishchenko ◽  
I. V. Gorokhovik
Keyword(s):  
Service Life ◽  
Power System ◽  
Electric Power ◽  
Power Supply ◽  
Electric Power System ◽  
Throughput Capacity ◽  
Electrical Network ◽  
Economic Losses ◽  
Insulation Material ◽  
Overload Capacity

During the operation of the electric power system, there is often a need to overload its individual elements (generators, power transformers, overhead and cable power lines, switching electric devices) for a period lasting from several dozens of minutes to a day. The overloads can be caused by intentional disconnection of parallel elements of the system because of scheduled preventive repairs, post-accident disconnections, as well as an unexpected increase in electricity consumption due to the impact of various factors. The overload capacity of the system elements makes it possible to increase operational reliability of power supply to consumers without additional expenditures while maintaining, in most cases, the almost normal service life of electrical equipment. Oil-filled transformers have the greatest potential overload capacity power, which makes it possible to consider them as a significant source of increasing the capacity of the transmission and distribution networks of the electric power system. Excessive over-current of power oil-filled transformers significantly reduces reliability and reduces their normal service life. This is due to the accelerated process of wear of the insulation material of the transfer windings as a result of overheating of the transformer oil, that causes structural changes and, as a consequence, to mechanical damage to the insulation of the windings; the latter can cause an electrical puncture. On the other hand, underestimation of the permissible overload of transformers might result in economic losses due to under-produced products when the functioning of the part of the transformers connected in parallel are ceased for scheduled preventive maintenance or as a result of forced emergency shutdowns. Therefore, there is a need to assess the potential of reasonable increase in the throughput capacity of the electrical network and, accordingly, the reliability of the power supply system, taking into account the requirements for the permissible loads of transformers when the electrical network and various operating modes are being designed.

scholarly journals Power Flow and Short Circuit Analysis of Distribution System with 300 kW Distributed Generation Connected

2021 ◽  
Vol 1 (1) ◽  
pp. 33-40
Author(s):  
Muhardika Muhardika ◽  
Syahroni Syahroni
Keyword(s):  
Electric Power ◽  
Distributed Generation ◽  
Power Flow ◽  
Short Circuit ◽  
Flow Analysis ◽  
Circuit Analysis ◽  
Electric Power System ◽  
Electrical System ◽  
Power Flow Analysis ◽  
Short Circuit Analysis

Power flow analysis aims to determine the capacity of a generator to serve loads, to know the value of power losses in the electrical system, and to carry out a planning and development of the electric power system. Power flow analysis is carried out in order to find out the characteristics of the electric power system to be built or to be developed as desired. In this study, power flow analysis and short circuit analysis were carried out in the electrical system of Andalas University with 2 conditions, namely, when the conditions were normal or when the Distributed Generation was not added and when the conditions were added, the Distributed Generation (DG) Photovoltaic 300 kW. The results of this study indicate the largest system losses when normal conditions are on bus 1 to bus 2 amounting to 20.21 kW and 6.13 kVar, and when conditions add DG on bus 17 to bus 18 are 230.8 kW and 142.7 kVar. The results of the short circuit analysis of the two conditions are on bus 1 when the condition is experiencing the addition of DG with an increase in average current, namely 1 soil phase of 0.86 kA, 2 phases of 0.175 kA, 2 soil phases of 0.09609 kA, and 3 phases of 0.085273 kA from when the conditions were normal. Keywords : Power Flow Analysis, Short Circuit Analysis, Photovoltaic, Wind Turbine

scholarly journals A Novel Methodology for Adaptive Coordination of Multiple Controllers in Electrical Grids

Mathematics ◽  
2021 ◽  
Vol 9 (13) ◽  
pp. 1474
Author(s):  
Ruben Tapia-Olvera ◽  
Francisco Beltran-Carbajal ◽  
Antonio Valderrabano-Gonzalez ◽  
Omar Aguilar-Mejia
Keyword(s):  
Power Systems ◽  
Power System ◽  
Electric Power ◽  
Large Scale ◽  
Short Circuit ◽  
Dynamic Performance ◽  
Low Frequency ◽  
Electric Power System ◽  
Design Stage ◽  
Positive Interaction

This proposal is aimed to overcome the problem that arises when diverse regulation devices and controlling strategies are involved in electric power systems regulation design. When new devices are included in electric power system after the topology and regulation goals were defined, a new design stage is generally needed to obtain the desired outputs. Moreover, if the initial design is based on a linearized model around an equilibrium point, the new conditions might degrade the whole performance of the system. Our proposal demonstrates that the power system performance can be guaranteed with one design stage when an adequate adaptive scheme is updating some critic controllers’ gains. For large-scale power systems, this feature is illustrated with the use of time domain simulations, showing the dynamic behavior of the significant variables. The transient response is enhanced in terms of maximum overshoot and settling time. This is demonstrated using the deviation between the behavior of some important variables with StatCom, but without or with PSS. A B-Spline neural networks algorithm is used to define the best controllers’ gains to efficiently attenuate low frequency oscillations when a short circuit event is presented. This strategy avoids the parameters and power system model dependency; only a dataset of typical variable measurements is required to achieve the expected behavior. The inclusion of PSS and StatCom with positive interaction, enhances the dynamic performance of the system while illustrating the ability of the strategy in adding different controllers in only one design stage.

An experimental investigation on PZT behavior under mechanical and cycling loading

2013 ◽  
Vol 22 (3-4) ◽  
pp. 129-136
Author(s):  
Haim Abramovich ◽  
Eugeny Tsikchotsky ◽  
Gregory Klein
Keyword(s):  
Electric Power ◽  
Mechanical Stress ◽  
Electrical Power ◽  
Electrical Energy ◽  
Mechanical Stresses ◽  
Cyclic Loads ◽  
Present Test ◽  
Static Mechanical ◽  
The Right ◽  
Cycling Loading

AbstractThe drive to produce electrical energy by directly compressing piezoceramic material using mechanical stress stands behind the present test series. To be able to correctly choose the right material, PZT disks manufactured by three different manufacturers have been tested under static mechanical compressive and cyclic loads. It was shown that although the disks can withstand high mechanical stresses (up to 100 MPa) without any visible damage, their transduction is confined to much lower stresses (50–75 MPa), a range in which the electrical output is a function of the square of the applied stress. This range is further reduced, when the PZT is subjected to cyclic mechanical loading, yielding an applicable mechanical stress in the range of 30–40 MPa, from which electrical power can be produced without further deterioration. To compensate for the low electric power, due to relatively low mechanical stresses applied on the PZT disks, one can increase the volume of the material used by placing layers of piezoelectric material one on top of the other, each subjected to the same mechanical stress. This will yield the required electric power from a safe given mechanical stress without reduction in its output.

The Design and Implement of Electrical Operator Monitoring System

2013 ◽  
Vol 5 (3) ◽  
pp. 60-65
Author(s):  
Yao Wan-Ye ◽  
Sun Teng-Zhong ◽  
Jiang Xue-Li
Keyword(s):  
Power Generation ◽  
Computer Science ◽  
Production Process ◽  
Electric Power ◽  
Monitoring System ◽  
Electric Power System ◽  
Electrical System ◽  
Key Technology ◽  
Internet Technologies ◽  
System Data

Since the traditional electrical system data monitor equipment has some shortage, such as limited monitoring objects, single monitoring direction, the authors combine computer science Internet technologies with electric power system production process and extend the scope of monitoring system. This paper analyzes the key technology by which the operator monitoring system can be realized, and puts forward the scheme, which based on.NET platform, of recording operator’s behaviors during electric power generation, and it is implemented in WINDOWS system.

Review of Short Circuit Current Prediction Technology in Electric Power System

2021 ◽  
pp. 311-327
Author(s):  
Xiren Miao ◽  
Shengbin Zhuang ◽  
Jiamin Li ◽  
Lingling Tang
Keyword(s):  
Power System ◽  
Electric Power ◽  
Short Circuit ◽  
Short Circuit Current ◽  
Electric Power System

Analisis Gangguan Pada Sistem Tenaga Listrik Jawa Bali 500 kV Menggunakan Power World Simulator

2019 ◽  
Vol 10 (1) ◽  
pp. 35-41
Author(s):  
Dwi Ajiatmo ◽  
Imam Robandi ◽  
Machrus Ali ◽  
Betta Aidya Suroya
Keyword(s):  
Power Systems ◽  
Power System ◽  
Electric Power ◽  
Power Distribution ◽  
Short Circuit ◽  
Electric Power Systems ◽  
Electric Power System ◽  
Positive Sequence ◽  
Simulation Design ◽  
Component System

Short circuit is one type of interference that often occurs in electric power systems. The interference if it lasts a long time will affect the quality and continity of electrical power distribution as well as the reliability and safety of the equipment on the system. To minimize the possibility of interference and to minimize the consequences caused by interference, an analysis of disturbances in the electric power system is needed. This study discusses the classification and analysis of disturbances in the electric power system. The type of interference in the electric power system is classified into two, namely symmetry and non-symmetrical interference. Symmetry disturbances are three phase disturbances which are described by the equation of the sequence of the symmetry component system. Sequence equations from the symmetry component system are positive sequence equations, negative sequence equations, and zero sequence equations. Non-symmetrical interference is a disorder that often occurs in electric power systems, namely the interference of one network to the ground, network interference to the network and interference of two networks to the ground. This research is to classify and to analyze the types of disturbances in the Java-Bali electric power system 500 kV 20 buses in the form of a single line diagram, using Power World Simulator and ETAP Software applications. The simulation results are calculated and display the simulation design of the power system with the tools contained in the program.

SIMULATION OF STATIONARY THERMAL REGIME OF OIL TRANSFORMER USING ANSYS

2021 ◽  
Vol 3 (1) ◽  
pp. 037-042
Author(s):  
V. O. KROPOTIN ◽  
◽  
S. S. GIRSHIN ◽  
V. N. GORYUNOV ◽  
E. V. PETROVA ◽  
...  
Keyword(s):  
Service Life ◽  
Electric Power ◽  
Thermal Regime ◽  
Load Capacity ◽  
Electric Power System ◽  
Energy Losses ◽  
Power Losses ◽  
Ansys Software ◽  
Heating Rates ◽  
Simulation Results

With the expansion of the electric power system, the number of distribution plants increases, the most common in which are oil-immersed transformers. the increase in the number of transformers leads to an increase in energy losses, which depend on many factors, including the temperature of the windings. at the same time, temperature is one of the most important parameters that determine the service life of a transformer. the paper discusses a digital model of the thermal regime of an oil-immersed transformer with natural cooling based on the ansys software, focused both on the tasks of calculating energy losses and on assessing the load capacity. the simulation results are compared with the heating rates. the use of thermal regime models when calculating power losses can significantly increase the accuracy of calculations.

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