Short circuit currents of the SEPTA traction power distribution system

1997 ◽  
Vol 3 (6) ◽  
pp. 52-59 ◽  
Author(s):  
R. Natarajan ◽  
T.A. Kneschke ◽  
W. Naqvi ◽  
M.A. Lopez-Lopez ◽  
J. Hong ◽  
...  
Keyword(s):  
Power Distribution ◽  
Distribution System ◽  
Short Circuit ◽  
Power Distribution System ◽  
Short Circuit Currents ◽  
Traction Power

scholarly journals Active Reduction of Short-Circuit Current in Power Distribution Systems

Energies ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 334
Author(s):  
Esteban Pulido ◽  
Luis Morán ◽  
Felipe Villarroel ◽  
José Silva
Keyword(s):  
Power Distribution ◽  
Distribution System ◽  
Distribution Systems ◽  
Short Circuit ◽  
Circuit Breaker ◽  
Short Circuit Current ◽  
Power Converter ◽  
Power Distribution Systems ◽  
Power Distribution System ◽  
In Series

In this paper, a new concept of short-circuit current (SCC) reduction for power distribution systems is presented and analyzed. Conventional fault current limiters (FCLs) are connected in series with a circuit breaker (CB) that is required to limit the short-circuit current. Instead, the proposed scheme consisted of the parallel connection of a current-controlled power converter to the same bus intended to reduce the amplitude of the short-circuit current. This power converter was controlled to absorb a percentage of the short-circuit current from the bus to reduce the amplitude of the short-circuit current. The proposed active short-circuit current reduction scheme was implemented with a cascaded H-bridge power converter and tested by simulation in a 13.2 kV industrial power distribution system for three-phase faults, showing the effectiveness of the short-circuit current attenuation in reducing the maximum current requirement in all circuit breakers connected to the same bus. The paper also presents the design characteristics of the power converter and its associated control scheme.

scholarly journals Probability-Based Customizable Modeling and Simulation of Protective Devices in Power Distribution Systems

Energies ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 199
Author(s):  
Chengwei Lei ◽  
Weisong Tian
Keyword(s):  
Power Systems ◽  
Power Distribution ◽  
Distribution System ◽  
Distribution Systems ◽  
Short Circuit ◽  
Current Data ◽  
System Level ◽  
Power Distribution Systems ◽  
Power Distribution System ◽  
Protective Devices

Fused contactors and thermal magnetic circuit breakers are commonly applied protective devices in power distribution systems to protect the circuits when short-circuit faults occur. A power distribution system may contain various makes and models of protective devices, as a result, customizable simulation models for protective devices are demanded to effectively conduct system-level reliable analyses. To build the models, thermal energy-based data analysis methodologies are first applied to the protective devices’ physical properties, based on the manufacturer’s time/current data sheet. The models are further enhanced by integrating probability tools to simulate uncertainties in real-world application facts, for example, fortuity, variance, and failure rate. The customizable models are expected to aid the system-level reliability analysis, especially for the microgrid power systems.

Determination of Traction Power Distribution System Impedances and Susceptances for AC Railroad Electrification Systems

Joint Rail ◽  
2004 ◽  
Author(s):  
Tristan Kneschke ◽  
Phonigi Mbika
Keyword(s):  
Power Distribution ◽  
Distribution System ◽  
System Performance ◽  
Electrical Characteristics ◽  
Power Demand ◽  
Key Factors ◽  
Power Distribution System ◽  
Mutual Impedance ◽  
Traction Power

Electrical characteristics of the traction electrification system, together with the train power demand, headway, and operating scenario, are the key factors in determining the overall system performance. A mathematical procedure for calculation of traction power distribution system line impedances and capacitances is developed using the Alternative Transient Program (ATP). The technique is applied to Direct Feed and Autotransformer Feed traction electrification systems and typical results for one-, two-, three-, and four-track railroads are presented. All self-and mutual impedance and capacitance components are included in the calculations.

Study on Protection for Islanded Micro-Grid

2012 ◽  
Vol 614-615 ◽  
pp. 916-920
Author(s):  
Xue Ling Zhu ◽  
Fei Han ◽  
Jia Liu
Keyword(s):  
Distributed Generation ◽  
Power Distribution ◽  
Distribution System ◽  
Short Circuit ◽  
Relay Protection ◽  
Short Circuit Current ◽  
Power Distribution System ◽  
Protection Strategy ◽  
Islanded Operation ◽  
Micro Grid

Technology of Micro-grid emerges, and power distribution system faults, allowing for the distributed generation keeping alive the islanded operation with the important load . But if the interior of Micro-grid happens a fault again, the short-circuit current of Micro-grid is so insufficient that traditional current protection can not play a part in the protection. In order to solve this problem, it introduced a new relay protection strategy, and provided the basis for the relay protection design of Micro-grid in the future.

scholarly journals Multifunctional Dynamic Voltage Restorer for Power Quality Improvement

2018 ◽  
Author(s):  
Dung Vo Tien ◽  
Radomir Gono ◽  
Zbigniew Leonowicz
Keyword(s):  
Power Quality ◽  
Power Distribution ◽  
Distribution System ◽  
Short Circuit ◽  
Operating Conditions ◽  
Dynamic Voltage Restorer ◽  
Efficient Operation ◽  
Power Distribution System ◽  
Voltage Restorer ◽  
Dynamic Voltage

Power quality is a major concern in electrical power systems. The power quality disturbances such as sags, swells, harmonic distortion and other interruptions have impact on the electrical devices and machines and in severe cases can cause serious damages. Therefore it is required to recognize and compensate all types of disturbances at an earliest to ensure normal and efficient operation of the power system. To solve these problems, many types of power devices are used. At the present time, one of those devices, Dynamic Voltage Restorer (DVR) is the most efficient and effective device used in power distribution system. In this paper, design and modeling of a new structure of multifunctional DVR for voltage correction is presented. The performance of the device under different conditions such as voltage swell, voltage sag due to symmetrical and unsymmetrical short circuit, starting of motors, and voltage distortion are described. Simulation result shows the superior capability of proposed DVR to improve power quality under different operating conditions. The proposed new DVR controller is able to detect the voltage disturbances and control the converter to inject appropriate voltages independently for each phase and compensate to load voltage through three single- phase transformers.

scholarly journals Determination of Different Fault Features in Power Distribution System Based on Wavelet Transform

2019 ◽  
Vol 8 (4) ◽  
pp. 6256-6261
Keyword(s):  
Signal Processing ◽  
Wavelet Transform ◽  
Power Distribution ◽  
Distribution System ◽  
High Speed ◽  
Short Circuit ◽  
Voltage Waveform ◽  
Power Distribution System ◽  
Time Frequency ◽  
Skewness And Kurtosis

Nowadays, there are various signal processing methods that have been studied by many researchers in order to detect faults in power lines. From previous literature, signal processing that works based on time frequency analysis has been proven to accurately detect faults at high speed. In this study, wavelet transform is adopted to analyse fault occurrences on power line of distribution network. Three types of faults due to lightning, switching and short circuit fault were analysed based on their voltage waveform profiles. ‘Daubechies’ 4 (db4) mother wavelet and four levels decomposition were implemented to extract the features. Approximation at level 4 (A4) and detail coefficient at level 1 to 4 (D1-D4) were extracted to evaluate the energy, skewness, and kurtosis. Based on the results, lightning showed the highest energy, skewness and kurtosis compared to the short circuit and switching voltage waveform. Therefore, these features can be utilized as the new parameters for fault detection in a power system network

scholarly journals Analysis of The Failure Protection System 20 KV CBO T75B Substation Malibu Feeder PT PLN (Persero) UP3 Menteng

2021 ◽  
Vol 6 (2) ◽  
pp. 1422
Author(s):  
Doni Abdul Mukti ◽  
Budi Sudiarto
Keyword(s):  
Power System ◽  
Electric Power ◽  
Power Distribution ◽  
Distribution System ◽  
Short Circuit ◽  
Performance Testing ◽  
Electric Power System ◽  
Protection System ◽  
Electrical Power System ◽  
Power Distribution System

Protection is a safety in the electric power system installed in the electric power distribution system, power transformer, electric power transmission, and electric generator used to secure the power system electricity from electrical disturbances or overloads by separating the disturbed parts of the electric power system from the undisturbed electrical power system so that the undisturbed electrical system can continue to work. The protection system at the T75B substation has a work failure where when there is a short circuit on the consumer side, it causes the PMT (Power Breaker) for the Malibu Feeder at the Kebon Sirih Substation to trip while the CBO (Circuit Breaker Outgoing) cubicle at the T75B substation does not trip. This resulted in an unexpected widespread blackout. To find out the cause of the failure of the protection system, several tests and analyzes were carried out, namely protection design testing, protection relay coordination testing, protection system construction analysis, protection equipment performance testing. It is hoped that the test results can be used as a reference for improvement so that similar failures do not recur.

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