Transient Recovery Voltages Requirements for System Source Fault Interrupting by Small Generator Circuit Breakers

Dufournet, D.; Montillet, G.

doi:10.1109/mper.2002.4312015

Cited by 9 publications

(6 citation statements)

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“…Therefore, the TRV on the three phases are different, even in the same three-phase fault interruption. Moreover, the TRV occurring across the generator circuit breaker depends both on the fault location and on the fault nature [14][15][16][17][18][19][20][21][22].…”

Section: Modelling Of Transient Recovery Voltage (Trv) During Interrumentioning

confidence: 99%

“…cos sin sin cos (15) Writing with capitals the operational Laplace images of voltages and currents, the system of equations (15) becomes:…”

Section: Equations Of Synchronous Generator At Electric Perturbationmentioning

confidence: 99%

“…The electric connection circuits of power stations encompass GCBs at the generator terminals, since the presence of that electric equipment is related to the sustainability of a power plant [4][5][6][7][8][9][10][11][12][13][14][15]. The location of a GCB, between the generator and the main step-up transformer, influences the operating conditions, and a sustainable assessment of the GCB requirements addresses the main stresses on generator circuit breakers, revealing that the GCBs are significantly more difficult to apply to some operating regimes than classical network circuit-breakers [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

“…Here arises a sustainability requirement for generator circuit-breakers which are subjected to a unique demanding condition, called delayed current zeros [5,12,16]. -Since circuit breakers interrupt on the current zero crossing, generator circuit-breakers must be able to withstand longer arcing times and greater electrical, thermal and mechanical stresses when interrupting such faults [5][6][7][8][9][10][11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Some Aspects of Sustainable Energy Conversion During Transient Processes in Electric Power Systems Comprising Generator Circuit Breakers

Bulucea

Rosen

Nicola

et al. 2013

Proceedings of the 3rd World Sustainability Forum

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This paper is a sequel to a study by the authors of electric power systems comprising the generator circuit-breakers (GCBs) at power plant generator terminals. A sustainable assessment of the current interruption requirements of a GCB addresses the main stresses on the generator circuit breaker, revealing that the GCB current interruption requirements are significantly higher than for the distribution network circuit breakers. Hence, generator circuit-breakers are subject to unique demanding conditions caused by specific stresses, namely: high asymmetrical fault currents resulting from high d.c. components of the fault current; greater electrical, thermal and mechanical stresses when interrupting longer arcing time faults; and important dielectric stress after the electric arc extinction caused by the transient recovery voltage (TRV). This paper extends other studies of the authors on the energetic and exergetic transformation chain at the interruption current OPEN ACCESS 2 transient process in an electric power system that comprises the generator circuit-breaker, as well as the transient recovery voltage which appears after the interruption of a short-circuit fed by the synchronous generator or by the main step-up transformer. For achieving the TRV equivalent configuration the authors applied the method of operational symmetrical components (o.s.c.), and utilized the operational impedances of the synchronous generator and of the main transformer, depending on the fault location. Modeling the transient recovery voltage of circuits emphasizes aspects with direct implications on commutation equipment. Thus, the o.s.c. method can be applied at the poles of any breaker, for any eliminated fault type, if the network configuration and elements are known. The TRV, which appears after the interruption of a short-circuit fed by the generator, may be considered like an oscillation, where the oscillation factor and the rising rate (RR) of the TRV are established by the electrical machine parameters: resistance, inductance and capacitance. Consequently, modeling of concentrated equivalent parameters of the synchronous generator at perturbations caused by current interruption transient processes is achieved in this study through an approach based on sustainability concepts. These findings allow for simulations of the transient recovery voltage and comparisons with experimental results.

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Section: Modelling Of Transient Recovery Voltage (Trv) During Interrumentioning

confidence: 99%

“…cos sin sin cos (15) Writing with capitals the operational Laplace images of voltages and currents, the system of equations (15) becomes:…”

Section: Equations Of Synchronous Generator At Electric Perturbationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Some Aspects of Sustainable Energy Conversion During Transient Processes in Electric Power Systems Comprising Generator Circuit Breakers

Bulucea

Rosen

Nicola

et al. 2013

Proceedings of the 3rd World Sustainability Forum

View full text Add to dashboard Cite

show abstract

“…Just after the short-circuit current interruption by the generator circuit-breaker (when the GCB has been subjected to a 50,000 degree plasma arc), between its opened contacts arises the transient recovery voltage (TRV) which constitutes the most important dielectric stress after the electric arc extinction [7,25,26,27]. If the rising rate (RR) of TRV exceeds the rising rate of dielectric strength across the open gap within the extinction chamber of the GCB, the electric arc will rekindle (re-strike) and this time the electric arc exergy will be entirely used in a mechanically destructive process determined by the electrodynamics forces.…”

Section: Modelling Of Transient Recovery Voltage (Trv) Occuring At Inmentioning

confidence: 99%

Analyzing the Interruption Processes in the Generator Circuit Breaker through Sustainability Concepts

Bulucea¹,

Rosen²,

Nicola³

et al. 2012

Proceedings of the 2nd World Sustainability Forum

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Nowadays, the electric connection circuits of power plants (based on fossil fuels as well as renewable sources) entail GCBs at the generator terminals, since the presence of that electric equipment offers many advantages related to the sustainability of a power plant. In an alternating current (a.c.) circuit the interruption of a short-circuit is performed by the circuitbreaker at the natural passing through zero of the short-circuit current. During the current interruption, an electric arc is generated between the opened contacts of the circuit-breaker. This arc must be cooled and extinguished in a controlled way. Since the synchronous generator stator can flow via highly asymmetrical short-circuit currents, the phenomena which occur in the case of short-circuit currents interruption determine the main stresses of the generator OPEN ACCESS 2 circuit-breaker; the current interruption requirements of a GCB are significantly higher than for the distribution network circuit breakers. For shedding light on the proper moment when the generator circuit-breaker must operate, using the space phasor of the short-circuit currents, the time expression to the first zero passing of the short-circuit current is determined. Here, the manner is investigated in which various factors influence the delay of the zero passing of the short-circuit current. It is shown that the delay time is influenced by the synchronous machine parameters and by the load conditions which precede the short-circuit. Numerical simulations were conducted of the asymmetrical currents in the case of the sudden three-phase short circuit at the terminals of synchronous generators. Further in this study it is emphasized that although the phenomena produced in the electric arc at the terminals of the circuit-breaker are complicated and not completely explained, the concept of exergy is useful in understanding the physical phenomena. The article points out that just after the short-circuit current interruption by the generator the circuit-breaker (when the GCB has been subjected to a 50,000 degree plasma arc), between its opened contacts, there arises the transient recovery voltage (TRV) which constitutes the most important dielectric stress after the electric arc extinction. Since the magnitude and shape of the TRV occurring across the generator circuit-breaker are critical parameters in the recovering gap after the current zero, in this paper, we model, for the case of the faults fed by the main step-up transformer, the equivalent configurations, with operational impedances, for the TRV calculation, taking into account the main transformer parameters, on the basis of the symmetrical components method.

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Influence of ultra‐high‐voltage hybrid reactive power compensation on the interrupting characteristics of CB at out‐of‐phase faults

Liu

Lou

et al. 2017

IET Generation, Transmission & Distribution

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Transient Recovery Voltages Requirements for System Source Fault Interrupting by Small Generator Circuit Breakers

Cited by 9 publications

References 0 publications

Some Aspects of Sustainable Energy Conversion During Transient Processes in Electric Power Systems Comprising Generator Circuit Breakers

Some Aspects of Sustainable Energy Conversion During Transient Processes in Electric Power Systems Comprising Generator Circuit Breakers

Analyzing the Interruption Processes in the Generator Circuit Breaker through Sustainability Concepts

Influence of ultra‐high‐voltage hybrid reactive power compensation on the interrupting characteristics of CB at out‐of‐phase faults

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