A Method for Controlled Fault Interruption for Use with HV SF&lt;inf&gt;6&lt;/inf&gt; Circuit Breakers

Thomas, Richard; Sölver, C.-E.

doi:10.1109/pct.2007.4538475

Cited by 7 publications

(2 citation statements)

References 3 publications

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“…In this case, it was decided to neglect the change in temperature in the vicinity of the zero current. This assumption was very rough because the problem of skipping current zero was extremely important [77][78][79]. Studies devoted to the analysis of the occurrence of thermal and/or electrical breakdowns due to the passage of zero current gave a complete picture of arcing.…”

Section: The Proposed Model Of Interaction Between Sf6 Gas Flow and Arcmentioning

confidence: 99%

Fluid Dynamics Calculation in SF6 Circuit Breaker during Breaking as a Prerequisite for the Digital Twin Creation

Popovtsev,

Khalyasmaa,

Patrakov

2023

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The requirements to switching the capacities of SF6 circuit breakers submitted by Russian Grid companies are difficult to satisfy. The first limitation is related to material and financial costs in order to create a new requirement-satisfying switching device. The second limitation is dictated by the necessity of calculating complex physical processes in a circuit braker interrupter during fault–current making or breaking before creating a prototype. The latter task is reduced to the problem of simulating the processes of interaction between the switching arc and the SF6 gas flow. This paper deals with the solution of the problem both analytically by a special method and numerically by a numerical software package through the creation of a mathematical model of the interaction process. The switching arc is taken into account as a form of a temperature source, based on experimental data on measuring the temperature of the arc column. The key feature of the research is to use the finite element method based on a moving mesh—the Arbitrary Lagrangian Eulerian (ALE) method. Such a problem statement allows us to take the contact separation curve of the circuit breaker into account as the input data of the model. The calculations were carried out during fault-current breaking by a 110 kV SF6 dead-tank circuit breaker. The calculations of pressure and mass flow in the under-piston volume change, gas flow speed, and temperature depending on the contact separation are given. The proposed model of the switching arc was used to simulate the process of 25 kA symmetrical fault–current breaking and was compared with an experiment.

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Section: The Proposed Model Of Interaction Between Sf6 Gas Flow and Arcmentioning

confidence: 99%

Fluid Dynamics Calculation in SF6 Circuit Breaker during Breaking as a Prerequisite for the Digital Twin Creation

Popovtsev,

Khalyasmaa,

Patrakov

2023

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“…The short circuit current Isc is line breaker current for a fault applied near HTS transformer line. There are some requirements need to follow for CFI method at fault condition in AC breakers [12]. The requirements for this system is described as: i.…”

Section: B Details Of Controlled Switching Of Breakermentioning

confidence: 99%

Mitigation of residual flux for high-temperature superconductor (HTS) transformer by controlled switching of HTS breaker arc model

Ullah

Lie

Gunawardane

et al. 2017

2017 IEEE Innovative Smart Grid Technologies - Asia (ISGT-Asia)

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AC circuit breaker's controlled switching is a popular method to reduce dielectric and thermal stresses during switching of transformers, transmission lines, reactor and shunt capacitors. The magnitude of inrush current often reaches five to nine times of rated magnetizing current and thus it affects the network stability. Particularly, it affects the superconductivity of HTS transformer. Moreover, a residual flux is developed in HTS transformer due to high inrush current. The amount of flux may increase to a very high value that has direct impact to have a very high transient inrush current. This paper presents inrush current mitigation phenomena in a single-phase HTS transformer by controlled switching of HTS breaker arc model. The inrush current phenomenon is modeled for a single-phase HTS transformer in this paper. The mitigation of inrush current is restrained to a lower level by the reclosing of a new type of arc model named HTS breaker arc model and the residual flux also minimized. The calculating method is established on the investigation of fast switching timing and characteristics of the HTS breaker arc model.

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Review of Short Circuit Current Prediction Technology in Electric Power System

Miao

Zhuang

et al. 2021

Lecture Notes in Electrical Engineering

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A Method for Controlled Fault Interruption for Use with HV SF<inf>6</inf> Circuit Breakers

Cited by 7 publications

References 3 publications

Fluid Dynamics Calculation in SF6 Circuit Breaker during Breaking as a Prerequisite for the Digital Twin Creation

Fluid Dynamics Calculation in SF6 Circuit Breaker during Breaking as a Prerequisite for the Digital Twin Creation

Mitigation of residual flux for high-temperature superconductor (HTS) transformer by controlled switching of HTS breaker arc model

Review of Short Circuit Current Prediction Technology in Electric Power System

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