Power Circuit-Breaker Insulation Co-Ordination-Required Minimum Volt-Time Characteristics for Power Circuit Breakers

This paper presents electrical stress analysis from capacitor bank switching in a 115 kV substation. The actual data of all equipment in substation are used in the simulated circuit by using ATP/EMTP program. The cases study focused on the determination of proper value of series reactor, effect of circuit breaker pole discrepancy on inrush current, line model selection and load variation. Electrical stress from energizing inrush current as well as transient recovery voltage and rate of rise of recovery voltage imposed on power circuit breaker during capacitor bank has been analyzed. The obtained results are used as guidelines for analysis of the electric stresses on substation equipment while capacitor banks are energized. Moreover, those results can be used to select the proper rating of circuit breakers to withstand the electric stresses in the transmission network.

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A Novel Approach to Power Circuit Breaker Design for Replacement of SF6

Acta Polytechnica ◽

10.14311/548 ◽

2004 ◽

Vol 44 (2) ◽

Author(s):

D. J. Telfer ◽

J. W. Spencer ◽

G. R. Jones ◽

J. E. Humphries

Keyword(s):

Circuit Breaker ◽

Circuit Breakers ◽

Power Circuit ◽

Current Interruption ◽

Novel Approach ◽

Different Gases ◽

Critical Contact ◽

Made In ◽

Gas Pressures

This contribution explores the role of PTFE ablation in enhancing current interruption for various background gases in high voltage circuit breakers. An assessment of the current interruption capability has been made in terms of the arcing duration and the contact gap length at which critical arc extinction is achieved. These observations are supported by measurements of the magnitude of extinction and re-ignition voltage peaks. Most previous and other current experimental work on gas filled circuit breaker design follows conventional wisdom in investigating arcing behaviours at elevated gas pressures (usually up to 6 bar). But in this work we concentrate on the effects of using low gas pressures (less than 1 bar) in the presence of a close-fitting shield of ablatant polymer material (PTFE) that surrounds the electrode assembly of an experimental high power circuit breaker. We demonstrate that for several different gases, arc extinction capability compares well under these conditions with SF6, suggesting that SF6 could be replaced entirely in this novel system by more environmentally friendly gases. Moreover, the critical contact gap lengths at extinction are only slightly greater than when using SF6 at 6 bar. Weight loss measurements from the ablatant shield suggest that a chemical puffer action is the most likely mechanism for achieving the observed arc extinctions in this system.

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Solid-State DC Circuit Breakers and their Comparison in Modular Multilevel Converter Based-HVDC Transmission System

Electronics ◽

10.3390/electronics10101204 ◽

2021 ◽

Vol 10 (10) ◽

pp. 1204

Author(s):

Gul Ahmad Ludin ◽

Mohammad Amin Amin ◽

Hidehito Matayoshi ◽

Shriram S. Rangarajan ◽

Ashraf M. Hemeida ◽

...

Keyword(s):

Solid State ◽

High Voltage ◽

Direct Current ◽

Circuit Breaker ◽

Transmission System ◽

Simulation Software ◽

Fault Current ◽

Circuit Breakers ◽

Hvdc Transmission ◽

Dc Circuit Breakers

This paper proposes a new and surge-less solid-state direct current (DC) circuit breaker in a high-voltage direct current (HVDC) transmission system to clear the short-circuit fault. The main purpose is the fast interruption and surge-voltage and over-current suppression capability analysis of the breaker during the fault. The breaker is equipped with series insulated-gate bipolar transistor (IGBT) switches to mitigate the stress of high voltage on the switches. Instead of conventional metal oxide varistor (MOV), the resistance–capacitance freewheeling diodes branch is used to bypass the high fault current and repress the over-voltage across the circuit breaker. The topology and different operation modes of the proposed breaker are discussed. In addition, to verify the effectiveness of the proposed circuit breaker, it is compared with two other types of surge-less solid-state DC circuit breakers in terms of surge-voltage and over-current suppression. For this purpose, MATLAB Simulink simulation software is used. The system is designed for the transmission of 20 MW power over a 120 km distance where the voltage of the transmission line is 220 kV. The results show that the fault current is interrupted in a very short time and the surge-voltage and over-current across the proposed breaker are considerably reduced compared to other topologies.

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Capacitor Commutation Method for MVDC Hybrid Circuit Breakers

Designs ◽

10.3390/designs5020028 ◽

2021 ◽

Vol 5 (2) ◽

pp. 28

Author(s):

Hyosung Kim

Keyword(s):

Short Circuit ◽

Circuit Breaker ◽

Reverse Current ◽

Resonant Circuit ◽

Power Circuit ◽

Power Sources ◽

Semiconductor Switch ◽

Current Commutation ◽

Dc Circuit Breaker ◽

Hybrid Circuit

The medium voltage DC (MVDC) type system can connect multiple terminals to a common MVDC bus, so it is possible to connect several renewable DC power sources to the common MVDC bus, but a DC circuit breaker is needed to isolate short circuit accidents that may occur in the MVDC bus. For this purpose, the concept of a hybrid DC circuit breaker that takes advantage of a low conduction loss contact type switch and an arcless-breaking semiconductor switch has been proposed. During break the hybrid switch, a dedicated current commutation device is required to temporarily bypass the load current flowing through the main switch into a semiconductor switch branch. Existing current commutation methods include a proactive method and a reverse current injection method by a LC (Inductor-capacitor) resonant circuit. This paper proposes a power circuit of a new MVDC hybrid circuit breaker using a low withstanding voltage capacitor branch for commutation and a sequence controller according to it, and verifies its operation through an experiment.

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Transfer switches applied in systems with power circuit breakers

IEEE Transactions on Industry Applications ◽

10.1109/28.924747 ◽

2001 ◽

Vol 37 (3) ◽

pp. 696-700 ◽

Cited By ~ 2

Author(s):

D.D. Roybal

Keyword(s):

Circuit Breakers ◽

Power Circuit

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The Impact of Shunt Capacitor Installations on Power Circuit Breaker Application

IEEE Transactions on Power Apparatus and Systems ◽

10.1109/tpas.1980.319783 ◽

1980 ◽

Vol PAS-99 (6) ◽

pp. 2210-2222 ◽

Cited By ~ 12

Author(s):

T. McCauley ◽

D. Pelfrey ◽

W. Roettger ◽

C. Wood

Keyword(s):

Circuit Breaker ◽

Power Circuit ◽

Shunt Capacitor ◽

The Impact

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High-power circuit breakers

Students Quarterly Journal ◽

10.1049/sqj.1937.0002 ◽

1937 ◽

Vol 7 (27) ◽

pp. 101

Author(s):

W.F. Baker

Keyword(s):

High Power ◽

Circuit Breakers ◽

Power Circuit

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Development of a Method and Algorithm for Inhibiting an Automatic Transfer Switch of the Circuit Breaker for a Sustained Short-Circuit

E3S Web of Conferences ◽

10.1051/e3sconf/202022001011 ◽

2020 ◽

Vol 220 ◽

pp. 01011

Author(s):

Igor Nikolaevich Fomin ◽

Roman Pavlovich Belikov ◽

Tatyana Anatolyevna Kudinova ◽

Nailya Kamilevna Miftakhova

Keyword(s):

Short Circuit ◽

Circuit Breaker ◽

Electrical Equipment ◽

Ring Network ◽

Circuit Breakers ◽

Emergency Situations ◽

Short Circuit Currents

Circuit breakers with automatic transfer switches (ATS) are designed in such a way that when the voltage disappears during a short-circuit (SC) in the ring network line, the ATS device is triggered. At the same time, its switch is turned on at short-circuit, then it is turned off with acceleration. Even a shortterm switching on of the automatic transfer switch for a sustained short-circuit leads to emergency situations [1,2]. The electrical equipment of the ring network spare line is exposed to high emergency short-circuit currents, and the consumers powered by the spare transformer are turned off. It is possible to minimize and eliminate the damages caused by the above mentioned cases by inhibiting the switching on of the circuitbreaker of the automatic transfer switch.

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