Practical experience in short-circuit current limiting measures implementation

2017 ◽  
Author(s):  
Stanislav A. Eroshenko ◽  
Alexandr O. Egorov ◽  
Mihail D. Senyuk ◽  
Alexandra I. Khalyasmaa
Keyword(s):  
Short Circuit ◽  
Short Circuit Current ◽  
Practical Experience ◽  
Current Limiting

Current Limiting Reactor's Reactance Value Selection Based on Short-Circuit Transient Analysis

2013 ◽  
Vol 722 ◽  
pp. 223-227
Author(s):  
Tie Ying Zhao ◽  
Yan Wen Wang
Keyword(s):  
Transient Process ◽  
Transient Analysis ◽  
Short Circuit ◽  
Short Circuit Current ◽  
Engineering Calculation ◽  
Calculation Formula ◽  
Current Limiting ◽  
Current Change ◽  
Short Circuit Fault ◽  
A Current

Current limiting reactor can increase systems short circuit impedance so as to limit short circuit current. Current limiting reactor is directly involved in whole short circuit process when a short circuit fault occurs in a power system, which makes short-circuit current change more complex. Short circuit current level is affected by current limiting reactors parameters; a current limiting reactor with proper impedance value can maintain short-circuit current at an acceptable range. A short circuit transient process of a distributing network with current limiting reactor was analyzed, and the formula of current changing in short circuit transient process was deduced; according to the current changing formula, an engineering calculation formula of current limiting reactors impedance was derived. The case calculation shows that current limiting reactor meeting the need of the engineering calculation formula can reach the system current limiting requirement.

scholarly journals Fault Assessment and Mitigation of the 132kV Transmission Line in Nigeria using Improved Resonant Fault Current Limiting (RFCL) Protection Scheme

2018 ◽  
Vol 3 (10) ◽  
pp. 38-44
Author(s):  
D. C. Idoniboyeobu ◽  
S. L. Braide ◽  
Wigwe Elsie Chioma
Keyword(s):  
Power System ◽  
Transmission Line ◽  
Short Circuit ◽  
Short Circuit Current ◽  
Resonant Circuit ◽  
Fault Current ◽  
Protection Scheme ◽  
Current Limiting ◽  
Simulation Results ◽  
The Impact

This research work proposed an improved Resonant Fault Current Limiting (RFCL) protection scheme to reduce the impact of three-phase short-circuit faults in a power system sub-transmission network. The model used an interpolator-extrapolator technique based on a Resonant Fault Current Limiter (RFCL) for automating the procedure of predicting the required reactor value that must be in resonant circuit to limit the short-circuit current values to permissible values. Using the developed model, short-circuit fault simulations on the three phases of the transmission line (Phase A-C) were performed in the MATLAB-SIMULINK environment. Simulation results were obtained by varying the resonant inductance (reactor) parameter of the RFCL circuit for each of the phases to obtain permissible short-circuit current levels and the values used to program a functional interpolator-extrapolator in MATLAB; the resonant values were typically set to values of inductance equal to 0.001H, 0.01H and from 0.1H to 0.5H in steps of 0.1H. Simulation results revealed the presence of very high short-circuit current levels at low values of the resonant inductor. From the results of simulations, there are indications that the RFCL approach is indeed very vital in the reduction of the short circuit current values during the fault and can safeguard the circuit breaker mechanism in the examined power system sub-transmission system. In addition, lower fault clearing times can be obtained at higher values of inductances; however, the clearance times start to converge at inductance values of 0.1H and above.

High Capacity High-Speed Switch Application Analysis and Action Process Simulation

2015 ◽  
Vol 1092-1093 ◽  
pp. 276-280
Author(s):  
Tie Ying Zhao ◽  
Jun Ling Liu
Keyword(s):  
High Speed ◽  
Short Circuit ◽  
High Capacity ◽  
Short Circuit Current ◽  
Current Level ◽  
Parallel Structure ◽  
Application Analysis ◽  
Current Limiting ◽  
Simulation Results ◽  
Action Process

This paper analyzed high capacity high speed switch’s works and structures, proposed a parallel structure of high capacity high speed switch (FSR) with current limiting reactor. Through analysis of its action process, this paper used EMTP/ATP to simulate FSR action process, analyzed line current and voltage changes in normal and short circuit station. Simulation results show that the method can effectively limit short circuit current level.

Experiment of a Resistive Superconducting Fault Current Limiter Based on MgB2 under Different Supply Voltages

2013 ◽  
Vol 721 ◽  
pp. 527-530
Author(s):  
Lei Yao ◽  
Jun Mei ◽  
Jian Yong Zheng ◽  
Bin Liu ◽  
You Xu
Keyword(s):  
Short Circuit ◽  
Short Circuit Current ◽  
Test System ◽  
Fault Current ◽  
Fault Current Limiter ◽  
Voltage Level ◽  
Superconducting Fault Current Limiter ◽  
Current Limiting ◽  
Current Limiter ◽  
Test Result

In order to limit the short-circuit current, and to prevent the power grid and its equipment from the shock of the short circuit, the fault current limiter with detection, trigger and limiting was introduced. A small resistive type superconducting fault current limiter prototype based on MgB2, cooled by liquid helium and heliumgas, was developed and tested by a test system. The test result showed that the prototype based on MgB2 produced superior limiting performance, the short-circuit current suppressing ratio was up to more than 45%, and with the rise of the voltage level, the current limiting capability was also gradually increased, up to 56%.

scholarly journals Methods of Current Limitation in Low Voltage (up to 1 kV) Electric Networks

2021 ◽  
Vol 64 (6) ◽  
pp. 492-504
Author(s):  
A. Yu. Kapustsinski ◽  
S. V. Kanstantsinava
Keyword(s):  
Short Circuit ◽  
Short Circuit Current ◽  
Electrical Network ◽  
Design Stage ◽  
Negative Consequences ◽  
Current Limitation ◽  
Advantages And Disadvantages ◽  
Current Limiting ◽  
Protection Devices ◽  
Short Circuit Currents

The article discusses and systematizes the causes of high values of short-circuit currents in electrical networks up to 1 kV and indicates their negative consequences. A brief analysis of some current limiting methods (both with and without additional investment) is given, which makes it possible to reduce the negative effects when significant short-circuit currents occur. The variants of the implementation of these current limiting methods recommended for study at the design stage or when replacing equipment that has exhausted its resource, are considered. The advantages and disadvantages of the methods of limiting short-circuit currents described in the article are indicated. Options for connecting equipment with low power consumption to nodes of the electrical network up to 1 kV with high values of short-circuit currents are also considered. Special attention is paid to current-limiting protection devices, a detailed description of the design of some of them is given, the advantages of their use in comparison with other current-limiting methods are indicated, the corresponding graphs of the limitation of the periodic component of the short-circuit current, shock short-circuit current and thermal pulse are presented. Based on the analysis of graphic materials, the issue of ensuring the selectivity of protections is considered. The degree of prevalence of equipment with the property of current limitation is determined. A method for determining selective current-limiting protection devices is given, viz. the method of energy selectivity, the corresponding graphs for determining energy selectivity are presented. The physics allowing to determine the degree of efficiency of limiting the short-circuit current is described. Recommendations on the use of current-limiting equipment are proposed.

scholarly journals AC Microgrid Protection System Design Challenges—A Practical Experience

Energies ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 2016
Author(s):  
Sarat Chandra Vegunta ◽  
Michael J. Higginson ◽  
Yashar E. Kenarangui ◽  
George Tsai Li ◽  
David W. Zabel ◽  
...  
Keyword(s):  
System Design ◽  
Distribution Systems ◽  
Failure Modes ◽  
Short Circuit ◽  
Short Circuit Current ◽  
Practical Experience ◽  
Protection System ◽  
Implementation Challenges ◽  
Design Speed ◽  
Design Challenges

Alternating current (AC) microgrids are the next step in the evolution of the electricity distribution systems. They can operate in a grid-tied or island mode. Depending on the services they are designed to offer, their grid-tied or island modes could have several sub-operational states and or topological configurations. Short-circuit current levels and protection requirements between different microgrid modes and configurations can vary significantly. Designing a microgrid’s protection system, therefore, requires a thorough understanding of all microgrid operational modes, configurations, transitional states, and how transitions between those modes are managed. As part of the microgrid protection design, speed and reliability of information flow between the microprocessor-based relays and the microgrid controller, including during microgrid failure modes, must be considered. Furthermore, utility protection practices and customer requirements are not always inclusive of the protection schemes that are unique to microgrids. These and other aspects contribute to the overall complexity and challenge of designing effective microgrid protection systems. Following a review of microgrid protection system design challenges, this paper discusses a few real-world experiences, based on the authors’ own engineering, design, and field experience, in using several approaches to address microgrid protection system design, engineering, and implementation challenges.

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