On Site Test Research and Application of Flexible Short-circuit Current Suppression Technology Based on 220kV Fast Circuit Breaker

The coordination between protective devices is the process of determining the most appropriate timing of power interruption during abnormal conditions in the power system. The aim of this work is to coordinate the protection of the 33/11 kV power distribution substation in Iraq using the CYME 7.1 software package. In this paper overcurrent and earth fault relays are simulated in two cases, with time delay setting and instantaneous setting, to obtain the Time Current Characteristics (TCC) curves for each Circuit Breaker (CB) relay of Al-Karama substation (2×31.5 MVA, 33/11 kV) in Babil distribution network. The short circuit current at each CB is calculated and accordingly, the protection coordination for Al-Karama substation has been simulated. The TCC curves have been obtained in two cases for overcurrent and earth fault relays; in a case with time delay setting and in the case with the instantaneous setting. The setting takes into consideration the short circuit current at the furthest point of the longest outgoing feeder and the shortest outgoing feeder.

Download Full-text

Active Reduction of Short-Circuit Current in Power Distribution Systems

Energies ◽

10.3390/en13020334 ◽

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.

Download Full-text

Analysis of Dynamic Arc Parameters for Vacuum Circuit Breaker Under Short-Circuit Current Breaking

IEEE Transactions on Applied Superconductivity ◽

10.1109/tasc.2019.2891609 ◽

2019 ◽

Vol 29 (2) ◽

pp. 1-5 ◽

Cited By ~ 3

Author(s):

Hai Chen ◽

Xiaoming Liu ◽

Longnv Li ◽

Yixiong Liu ◽

Yaqian Zhang ◽

...

Keyword(s):

Short Circuit ◽

Circuit Breaker ◽

Short Circuit Current ◽

Vacuum Circuit Breaker

Download Full-text

Bidirectional Short-Circuit Current Blocker for DC Microgrid Based on Solid-State Circuit Breaker

Electronics ◽

10.3390/electronics9020306 ◽

2020 ◽

Vol 9 (2) ◽

pp. 306 ◽

Cited By ~ 27

Author(s):

Lujun Wang ◽

Boyu Feng ◽

Yu Wang ◽

Tiezhou Wu ◽

Huipin Lin

Keyword(s):

Solid State ◽

Low Voltage ◽

Short Circuit ◽

Circuit Breaker ◽

Short Circuit Current ◽

Rotational Inertia ◽

Dc Microgrid ◽

Protection Strategy ◽

Solid State Circuit ◽

Solid State Circuit Breaker

In order to solve the imminent problem in that the traditional protection strategy cannot meet time requirements, together with the fact that the rotational inertia of a DC microgrid is small and short-circuit fault develops rapidly, a bidirectional short-circuit current blocker (BSCCB) based on solid-state circuit breaker for a DC microgrid is proposed. Firstly, the bidirectional current blocking circuit structure is proposed based on the analysis of key components. Then, a top-level differential protection strategy is developed based on the aforementioned proposal. Finally, the performance of the blocking circuit is simulated and verified by experiments. The results show that the proposed method can block short-circuit current within 4 ms, and the response speed of the protection strategy is very fast compared with previous approaches. BSCCB also has reclosing, bidirectional blocking and energy releasing functions. The current blocker proposed in this paper can be reused multiple times and has a promising future in low-voltage DC microgrid application.

Download Full-text

Power Plant Station Protection System against Voltage Fluctuation

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.793.65 ◽

2015 ◽

Vol 793 ◽

pp. 65-69 ◽

Cited By ~ 2

Author(s):

Abadal Salam T. Hussain ◽

Waleed A. Oraibi ◽

Fadhel A. Jumaa ◽

F. Malek ◽

Syed F. Ahmed ◽

...

Keyword(s):

Power Plant ◽

Power System ◽

Short Circuit ◽

Electrical Power ◽

Circuit Breaker ◽

Digital Signal ◽

Short Circuit Current ◽

Electrical Power System ◽

System Protection ◽

Protective Relay

Electrical Power System protection is required to protectboth the user and the system equipment itself fromany fault, hence electrical power system is not allowed to operate without any protection devices installed. Power System fault is defined as the undesirable condition that occurs in the power system. Some of these undesirable conditions are short circuit, current leakage, ground faultand over-under voltage. With the increasing loads, voltages and short-circuit duty in power plant, over voltage protection has become more important today. Here, the component that had been used is PIC 16F877a microcontroller to control the whole system and especially on the circuit breakers as well as the LCT display unit is used to display the voltage level and type of generator that used to serve the load. Sensors are used to measure both thevoltage and the load. The controlled digital signal from PIC microcontroller is converted by using the digital analog converter to control the whole circuit. Thus a device called protective relay is created to meet this requirement. The protective relay is mostlyoften coupled with circuit breaker in a way that it can isolate the abnormal condition in the system.

Download Full-text

On the hot gas exhaustion in the exhaust chamber of a gas circuit breaker after short-circuit current interruption

Journal of Physics D Applied Physics ◽

10.1088/0022-3727/30/22/010 ◽

1997 ◽

Vol 30 (22) ◽

pp. 3123-3130 ◽

Cited By ~ 9

Author(s):

Yasushi Hayashi ◽

Katsumi Suzuki ◽

Eiichi Haginomori ◽

Hiroaki Toda ◽

Hisatoshi Ikeda

Keyword(s):

Short Circuit ◽

Circuit Breaker ◽

Short Circuit Current ◽

Current Interruption ◽

Hot Gas

Download Full-text

Influence of Eddy Current Effect on the Circuit Breaker Contact Mechanism Heat Loss

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.805-806.943 ◽

2013 ◽

Vol 805-806 ◽

pp. 943-947

Author(s):

Da Yang Wang ◽

Fang Yao ◽

Zhi Gang Li

Keyword(s):

Heat Loss ◽

Eddy Current ◽

Short Circuit ◽

Circuit Breaker ◽

Three Dimensional ◽

Short Circuit Current ◽

Field Analysis ◽

Current Effect ◽

Eddy Current Effect ◽

Contact Mechanism

With the three-dimensional field analysis software Ansoft Maxwell 3D, the three-dimensional finite element model of the contacts pair is established. They belong to a kind of miniature circuit breaker. The simulation is carried out in the transient magnetic field. Under the condition with or without eddy current effect, we get the position and numerical solution of the contact mechanism heat loss under different short-circuit current.

Download Full-text

Current-Zero Characteristics of a Vacuum Circuit Breaker at Short-Circuit Current Interruption

2006 International Symposium on Discharges and Electrical Insulation in Vacuum ◽

10.1109/deiv.2006.357270 ◽

2006 ◽

Cited By ~ 4

Author(s):

E. P. A. van Lanen ◽

R. P. P. Smeets ◽

Marjan Popov ◽

Lou van der Sluis

Keyword(s):

Short Circuit ◽

Circuit Breaker ◽

Short Circuit Current ◽

Current Interruption ◽

Vacuum Circuit Breaker ◽

Current Zero

Download Full-text

Analysis on 2nd Main Transformer Trip Accident of a Certain Substation of the West Inner Mongolia Power Grid

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.516-517.1312 ◽

2012 ◽

Vol 516-517 ◽

pp. 1312-1315

Author(s):

Li Juan Ge ◽

Yong Zhang ◽

Haijun Li

Keyword(s):

Sampling Error ◽

Short Circuit ◽

Circuit Breaker ◽

Short Circuit Current ◽

Current Transformer ◽

Differential Protection ◽

Prevention Measures ◽

Action Mechanism ◽

The West ◽

Protection Circuit

This paper mainly analyzes the causes of a 10KV line and 2nd transformer circuit breaker tripping, also analyzes the action mechanism of the relay protection. Because of the permanent phase fault at the head of the line, instantaneous over-current protection(SegmentⅠ) as its main protection of the phase fault made the 921 breaker triping, the action was selective.And the permanence of this fault led to the failure of the reclosing; Reversed the TA(current transformer) for measuring with the TA for differential protection in high voltage side of the transformer, this fault can also make the TA of the differential protection circuit quickly saturated when the external short-circuit current flowing through the TA. When the above saturation happens, a big differential current generating from differential circuit will lead to sampling error. This is the direct cause of the mal-operation of the differential protection which resulting in the 2nd transformer tripping. In response to this accident, put forward specific prevention measures.

Download Full-text