Superconducting Surge Current Limiter

Kozak, S.

doi:10.3390/en14216944

Cited by 4 publications

(1 citation statement)

References 23 publications

(67 reference statements)

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“…The voltage on the limiter and the temperature evolution during the current limiting process were calculated taking into account properties of HTS tape, copper and fibreglass in a wide range of temperatures. [39]. Numerical calculations determined the maximum short circuit time to avoid overheating of the superconducting windings.…”

Section: Numerical Calculationmentioning

confidence: 99%

Forces and Stresses in the Windings of a Superconducting Fault Current Limiter

Kozak

2022

Energies

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This paper presents the design of a Superconducting Fault Current Limiter (SFCL) and calculation results of forces and stresses in the windings of a resistive fault current limiter. The design of the fault current limiter consists of two parallelly connected and magnetically coupled windings, cooled by a single stage cryocooler. Magnetically compensated windings made of HTS tape give a very low voltage on the limiter at a nominal current. Limitation of the short-circuit time and the value of the maximum initial fault current reduces the thermal and dynamic effects of the passage of a fault current. Using devices which limit the value of a fault current can lower the level of required short-circuit capacity of the elements in a system. However, selected means of fault currents limitation must maintain the power quality standards. A perfect fault current limiter is required to have substantial impedance in fault conditions and zero impedance at work currents. Such requirements are met by a SFCL. An increase of current caused by the occurrence of a fault current results in the transition of the superconducting material from the superconducting state into the resistive state. This increases the impedance of short-circuit loop, allowing the fault current value to decrease. During a short-circuit, the forces generated from the short-circuit current also act on the limiter windings. Short-circuit current causes stresses in the superconducting tape. Exceeding the permissible stress value results in an irreversible reduction in the critical current of the superconducting tape. Calculations of the forces and stresses in the HTS tape for the maximum value of the short-circuit current were carried out using the finite element method. The constructed limiter was tested and the winding design ensures that the tape stresses are at a safe level even for short-circuit currents.

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Section: Numerical Calculationmentioning

confidence: 99%

Forces and Stresses in the Windings of a Superconducting Fault Current Limiter

Kozak

2022

Energies

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Features of planning and managing power flows in distribution grids of megalopolises

Ilyushin,

Filippov,

Suslov

2024

Renewable Energy

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Cooperation of an Electric Arc Device with a Power Supply System Equipped with a Superconducting Element

Komarzyniec

2022

Energies

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This paper analyses the validity of using superconductors in the power supply system of arc devices. Two cases were analysed: when an additional superconducting element was included in the conventional power supply system and when the total power supply system was made of a superconductor. The analysis was carried out by simulating the cooperation of the arc receiver with its simplified power supply system in Matlab Simulink software. The characteristics of the changes of the arc current, its conductance and voltage as a function of the arc length changes for selected superconductor parameters, i.e., different values of the critical current and different values of the resistance in the resistive state, are given. The time courses of these quantities as well as the courses of resistance changes in the superconductor at randomly varying arc lengths are presented. The analysis showed that by selecting the critical current and resistance in the resistive state of the superconductor, arc parameters such as arc current drawn and arc conductance can be influenced. By making the entire power system from a superconductor, the arc current can be increased by 1.8% for a 1 cm arc and by 1% for a 1 cm arc. The ability of the superconductor to lose its superconducting state and return to that state can be used to limit the value of the current drawn by the arc over certain ranges of arc length. The range of these lengths can be controlled by selecting the value of the critical current of the superconductor. By selecting the resistance of the superconductor in the resistive state, the value of the limited current can be influenced. In the case studied, for a 1 cm arc length, an arc current 45% lower was obtained when the superconductor was in the resistive state.

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Superconducting Surge Current Limiter

Cited by 4 publications

References 23 publications

Forces and Stresses in the Windings of a Superconducting Fault Current Limiter

Forces and Stresses in the Windings of a Superconducting Fault Current Limiter

Features of planning and managing power flows in distribution grids of megalopolises

Cooperation of an Electric Arc Device with a Power Supply System Equipped with a Superconducting Element

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