Superconducting Transformer and Regulation Circuit for the CERN cable test facility

Verweij, Arjan; Denarie, C.-H.; Geminian, S.; Vincent-Viry, O.

doi:10.1088/1742-6596/43/1/203

Cited by 10 publications

(10 citation statements)

References 1 publication

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“…to use superconducting transformers [9][10][11][12][13][14][15][16][17] . A low current is fed to a superconducting primary winding with a large number of turns, inductively coupled to a superconducting secondary with a much smaller number of turns and directly connected to the sample under test.…”

Section: /21mentioning

confidence: 99%

“…In 10 and 11 , advanced systems for measuring the secondary current and for compensating its decay are proposed. Both are based on similar concepts for the improvement of the current measurement quality and the implementation of a suitable control.…”

Section: /21mentioning

confidence: 99%

“…The signal conditioning and the control are then implemented by means of customized analog electronics. In 10 , main drawbacks are the resolution and the offset of the digital integrator. In 11 , these issues are addressed both by implementing a custom FPGA-based integrator with higher resolution and by minimizing the residual offset via a dedicated procedure.…”

Section: /21mentioning

confidence: 99%

See 2 more Smart Citations

Performance improvement of a measurement station for superconducting cable test

Arpaïa

Bottura

Montenero

et al. 2012

Review of Scientific Instruments

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A fully digital system, improving measurements flexibility, integrator drift, and current control of superconducting transformers for cable test, is proposed. The system is based on a high-performance integration of Rogowski coil signal and a flexible direct control of the current into the secondary windings. This allows state-of-the-art performance to be overcome by means of out-of-the-shelf components: on a full-scale of 32 kA, current measurement resolution of

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Section: /21mentioning

confidence: 99%

Section: /21mentioning

confidence: 99%

Section: /21mentioning

confidence: 99%

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Performance improvement of a measurement station for superconducting cable test

Arpaïa

Bottura

Montenero

et al. 2012

Review of Scientific Instruments

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“…The voltage drop across the sample under test is measured through taps disposed along the cable. This procedure seems to be rather simple, but the required degree of complexity for the implementation of a test facility becomes evident considering the need for i) a dedicated cryogenic system, ii) currents of the order of tens of kA, and iii) superconducting magnets for background fields of several T (for example [2]- [5] ducting transformers become an interesting alternative to highcurrent DC power converters [4], [6]- [10]. On the other hand, in addition to the difficulty of operating a superconducting transformer [11], a major metrological issue is the measurement of the transformer's secondary current, which is the current flowing in the cable under test.…”

Section: Introductionmentioning

confidence: 99%

“…The current must be measured via contactless sensors capable of working at cryogenic temperatures [12] (interruptions of the superconducting circuit have to be avoided). Widely used current sensors are Rogowski and pick up coils [6], [7], [9], [11]. This classical solution has drawbacks such as intrinsic AC nature and limited measurement time due to the need of low drift integration (to keep accuracy of the measured current within the range of hundreds of ppm [11]).…”

Section: Introductionmentioning

confidence: 99%

Design, Assembly, and Commissioning of a Cryogenic DC Current Transformer Designed for Measuring Currents of up to 80 kA

Montenero

Arpaïa

Ballarino

et al. 2015

IEEE Trans. Appl. Supercond.

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A new cryogenic dc current transformer (Cryo-DCCT) has recently been designed and assembled at CERN. The device, whose design is based on that of a high-accuracy 600 A market solution suitable for room temperature applications, is optimized for measuring currents of up to 80 kA and for operation at 4.2 K. The CryoDCCT has been conceived with the objective of preserving the metrological performance of the original commercial device in the new extended range of operation. For reducing the effect of interfering magnetic fields arising from test conditions, it incorporates ferromagnetic and MgB2 superconducting shields. In this paper, the design of the CryoDCCT and the results of the commissioning of the device at CERN are reported. The effectiveness of the current transducer is analysed and discussed. This new device will be used for measuring the secondary current of a 80 kA superconducting transformer feeding a sample of NbSn3 cable at the Facility for Research on Superconducting Cables (FRESCA) at CERN.

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A superconducting transformer system for high current cable testing

Godeke

Dietderich

Joseph

et al. 2010

Review of Scientific Instruments

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This article describes the development of a Direct-Current (DC) superconducting transformer system for the high current test of superconducting cables. The transformer consists of a core-free 10,464 turn primary solenoid which is enclosed by a 6.5 turn secondary. The transformer is designed to deliver a 50 kA DC secondary current at a DC primary current of about 50 A. The secondary current is measured inductively using two toroidal-wound Rogowski coils. The Rogowski coil signal is digitally integrated, resulting in a voltage signal that is proportional to the secondary current. This voltage signal is used to control the secondary current using a feedback loop which automatically compensates for resistive losses in the splices to the superconducting cable samples that are connected to the secondary. The system has been commissioned up to 28 kA secondary current. The reproducibility in the secondary current measurement is better than 0.05% for the relevant current range up to 25 kA. The drift in the secondary current, which results from drift in the digital integrator, is estimated to be below 0.5 A/min. The system's performance is further demonstrated through a voltage-current measurement on a superconducting cable sample at 11 T background magnetic field. The superconducting transformer system enables fast, high resolution, economic, and safe tests of the critical current of superconducting cable samples.

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Superconducting Transformer and Regulation Circuit for the CERN cable test facility

Cited by 10 publications

References 1 publication

Performance improvement of a measurement station for superconducting cable test

Performance improvement of a measurement station for superconducting cable test

Design, Assembly, and Commissioning of a Cryogenic DC Current Transformer Designed for Measuring Currents of up to 80 kA

A superconducting transformer system for high current cable testing

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