scholarly journals Sistem Proteksi Power Supply Modul Praktikum Teknik Digital

2015 ◽  
Vol 2 (3) ◽  
pp. 156
Author(s):  
Anwar Mujadin
Keyword(s):  
Response Time ◽  
Power Supply ◽  
Electronic Circuit ◽  
Short Circuit ◽  
Protection System ◽  
Capacitor Discharge ◽  
Voltage Comparator ◽  
Filter Capacitor ◽  
Experiment Module

<p><em>Abstrak<strong> – </strong></em><strong><em>Dalam melakukan praktikum teknik digital berbasis protoboard kadangkala pihak pengguna melakukan kesalahan fatal yaitu terjadi hubung singkat power supply dalam interkoneksi. Untuk menghindari kerusakan power supply akibat hubung singkat dalam modul praktikum digital, diperlukan sebuah rangkaian elektronika yang mampu mendeteksi dan memutus arus  sumber (power supply) dengan segera pada saat terjadi hubung singkat.</em></strong> <strong><em>Modul praktikum teknik digital dalam penelitian ini telah dilengkapi dengan sistem proteksi power supply dari hubung singkat dengan waktu tanggap kurang dari 5 ms, menggunakan teknis waktu jeda pengosongan kapasitor dan opamp pembanding tegangan.</em></strong><strong><em> </em></strong></p><p><strong><em> </em></strong></p><p><em>Abstract<strong> – When conducting experiments practicum in digital protoboard base project, users often made a fatal mistake that cause short circuit interconnection. To avoid damaging the power supply of experiment module (hardware), it requires an electronic circuit that is able to detect and cut off the main power supply immediately. In research the modular lab has been equipped with an electronics short circuit protection system with a response time of less than 5 ms, using capacitor discharge and opamp voltage comparator technique. </strong></em></p><p><strong><em> </em></strong></p><p><strong><em>Keyword – </em></strong><em>RC Transient, Power Supply Protection</em><em> Systems, Bypass Filter Capacitor.</em></p>

scholarly journals Development of Fast Acting Electronic Circuit Breaker

2020 ◽  
pp. 149-152
Author(s):  
K. Siva Shankar ◽  
D. Gayatri ◽  
Ganesh B ◽  
T. Ramarao ◽  
N. Sai Kumar ◽  
...  
Keyword(s):  
Power Supply ◽  
Electronic Circuit ◽  
Short Circuit ◽  
Circuit Breaker ◽  
Electrical Energy ◽  
Operational Reliability ◽  
Current Transformer ◽  
Short Period ◽  
In Series ◽  
Fast Acting

The rapid increase in population has more demand and consumption of electrical energy in the market, use of equipments such as electrical and electronic components are also costlier. In order to protect the system from overload, or short circuit here is one possibility, which is by fast acting electronic circuit breaker. A circuit breaker is an automatically operating switch designed to shut down the power supply when it is overloaded. The tripping depends on the current passing through the CT’s which is connected in series with load. The project is designed to develop the power supply which shuts down when it is overloaded by using a fast acting electronic circuit breaker. The concept of developing a electronic circuit breaker came into focus realizing that the conventional circuit breakers such as MCB’s and fuse take longer time to trip. Therefore for sensitive loads it is very important to activate the tripping mechanism within short period of time. We know that the Modern technologies are paramount to provide operational reliability and financial profitability, so it is very important to develop an electronic circuit breaker by using a micro controller arduino. Here an electronic circuit breaker is designed using arduino in which program is dumped and a particular is set so that the system can shut down when it is overloaded. Here the voltage is sensed and rectified to DC and then it is compared with a preset voltage by a level comparator to generate an output that drives a relay to trip the load. The relay is preferred in place of semiconductors because such solid state switches would invariably fail in case of accidental short circuits. This project is designed to overcome the drawback of thermal type of circuit breaker like MCB based on a thermal bimetal lever trip mechanism which is very slow. This project is based on the current sensing across a series element typically a CT (Current Transformer). The current sensed which is compared against the preset value proportional to the voltage by comparator which is inbuilt in arduino to generate an output that drives a relay to trip the load very fast.

Calculation of Short-Circuit Fault Currents in an Electric Traction Network with Double Ended Power Supply

2019 ◽  
Vol 5 (5) ◽  
pp. 19-23
Author(s):  
Leonid A. GERMAN ◽  
◽  
Alexandr S. SEREBRYAKOV ◽  
Aleksey B. LOSKUTOV ◽  
Vladimir L. OSOKIN ◽  
...  
Keyword(s):  
Power Supply ◽  
Short Circuit ◽  
Fault Currents ◽  
Traction Network ◽  
Electric Traction ◽  
Short Circuit Fault

Influence of distributed power supply in distributed power distribution network

2021 ◽  
pp. 1-8
Author(s):  
Xin Shen ◽  
Hongchun Shu ◽  
Min Cao ◽  
Nan Pan ◽  
Junbin Qian
Keyword(s):  
Power Supply ◽  
Power Distribution ◽  
Short Circuit ◽  
Power Grid ◽  
Distribution Network ◽  
Distribution Networks ◽  
Power Supplies ◽  
Power Distribution Network ◽  
Power Sources ◽  
Distributed Power

In distribution networks with distributed power supplies, distributed power supplies can also be used as backup power sources to support the grid. If a distribution network contains multiple distributed power sources, the distribution network becomes a complex power grid with multiple power supplies. When a short-circuit fault occurs at a certain point on the power distribution network, the size, direction and duration of the short-circuit current are no longer single due to the existence of distributed power, and will vary with the location and capacity of the distributed power supply system. The change, in turn, affects the current in the grid, resulting in the generation and propagation of additional current. This power grid of power electronics will cause problems such as excessive standard mis-operation, abnormal heating of the converter and component burnout, and communication system failure. It is of great and practical significance to study the influence of distributed power in distributed power distribution networks.

H∞ Control to the BUCK-Type Switching Power Supply with Small Perturbation

2013 ◽  
Vol 347-350 ◽  
pp. 1358-1362
Author(s):  
Zi Сheng Li ◽  
Li Xu ◽  
Bao Shan Yuan
Keyword(s):  
Power Supply ◽  
Current Control ◽  
Control Mode ◽  
State Variables ◽  
Switching Power Supply ◽  
Small Perturbations ◽  
Switching Power ◽  
Current Sampling ◽  
Output Filter ◽  
Filter Capacitor

The purpose in this paper is the design of the control to switching power supply for small perturbations. By the theoretical analysis and calculation, with the output filter inductor current and filter capacitor voltage switching power supply as two state variables, the conclusion is that control of the output filter inductor current sampling do well in the anti-jamming. The simulation is made for verification. And comparing the results, the current control mode shows a very strong anti-interference ability.

Normalization of Capacitor-Discharge I2t by Short-Circuit Fault in VSC-based DC System

2021 ◽  
pp. 1-1
Author(s):  
Seong-Yong Lee ◽  
Young-kwang Son ◽  
Hyung-June Cho ◽  
Seung-Ki Sul AE
Keyword(s):  
Short Circuit ◽  
Capacitor Discharge ◽  
Dc System ◽  
Short Circuit Fault

scholarly journals Power supply risk assessment method for relay protection system faults

2016 ◽  
Vol 65 (4) ◽  
pp. 803-814
Author(s):  
Si Tuyou ◽  
Wu Jiekang ◽  
Yuan Weideng ◽  
Du Anan
Keyword(s):  
Power Supply ◽  
Distribution Systems ◽  
Probability Model ◽  
Relay Protection ◽  
Assessment Method ◽  
Protection System ◽  
Supply Risk ◽  
Load Power ◽  
Risk Assessment Method ◽  
Protection Systems

Abstract The influence and the potential risk due to hidden faults of a relay protection system on power supply in distribution systems are paid more and more attention to. A probability analysis method is used to analyse fault characteristics and action mechanism of dominant faults, hidden misoperation and non-operation of the relay protection systems, and failure probability model of relay protection system is constructed and simplified. The effects of dominant faults, hidden misoperation and non-operation of the relay protection systems on the reduced power supply load power are analysed, and a probabilistic model for reduced power supply load power is constructed by three parts corresponding to dominant faults, hidden misoperation and non-operation. A probability calculation method of power supply risk occurrence due to hidden faults of relay protecttion system is proposed considering the fault probability of the relay protection systems, the frequency of the hidden faults occurring in operation period, the reduced power supply load power or load power outage, and the connection mode of the in-lines, out-lines and transformers in a substation. The feasibility and applicability of the proposed method for estimation of risk value probability of the relay protection systems is verified by two studied examples.

scholarly journals Microgrid Protection through Adaptive Overcurrent Relay Coordination

Electricity ◽  
2021 ◽  
Vol 2 (4) ◽  
pp. 524-553
Author(s):  
Haneen Bawayan ◽  
Mohamed Younis
Keyword(s):  
Power Flow ◽  
Short Circuit ◽  
Operating Time ◽  
Specific Area ◽  
Short Circuit Current ◽  
Protection System ◽  
Second Phase ◽  
Nonlinear Program ◽  
Overcurrent Relays ◽  
Overcurrent Relay

The inclusion of distributed energy resources (DER) in Microgrids (MGs) comes at the expense of increased changes in current direction and magnitude. In the autonomous mode of MG operation, the penetration of synchronous distributed generators (DGs) induces lower short circuit current than when the MG operates in the grid-connected mode. Such behavior impacts the overcurrent relays and makes the protection coordination difficult. This paper introduces a novel adaptive protection system that includes two phases to handle the influence of fault current variations and enable the MG to sustain its operation. The first phase optimizes the power flow by minimizing the generators’ active power loss while considering tolerable disturbances. For intolerable cases, the second phase opts to contain the effect of disturbance within a specific area, whose boundary is determined through correlation between primary/backup relay pairs. A directional overcurrent relay (DOCR) coordination optimization is formulated as a nonlinear program for minimizing the operating time of the relays within the contained area. Validation is carried out through the simulation of the IEEE 9, IEEE 14, and IEEE 15 bus systems as an autonomous MG. The simulation results demonstrate the effectiveness of our proposed protection system and its superiority to a competing approach in the literature.

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