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The effect of flux diverters on AC losses of a 10kVA high temperature superconducting demonstrator transformer

The effect of flux diverters on AC losses of a 10kVA high temperature superconducting demonstrator transformer
The effect of flux diverters on AC losses of a 10kVA high temperature superconducting demonstrator transformer
In this paper the design, construction and characterization of a 50 Hz single phase high temperature superconducting (HTS) transformer is presented. The transformer is designed to deliver 10 kVA at 77.4 K and 20 kVA at 65 K. The transformer is made of two windings positioned at the middle limb of a three-limb iron core. The secondary winding is made of nine double pancake superconducting coils, using silver sheathed BPSCCO-2223 multifilamentary tapes with nominal critical current of 20 A (at 77.4 K and self field). The primary winding is made of copper to reduce the cost of HTS material. Utilizing a superinsulated nonmetallic doughnut shaped cryostat with low background heat leak, the AC losses in the superconducting winding have been measured by calorimetric method. Two powdered iron flux diverters have been used inside the cryostat at both ends of the superconducting winding in order to reduce the radial component of leakage flux density in the HTS tapes. The use of these flux diverters is shown to be very effective in reducing the AC losses by 40% at the nominal current
bismuth compounds, calcium compounds, critical current density (superconductivity), cryostats, high-temperature superconductors, magnetic flux, magnetic leakage, multifilamentary superconductors, power transformers, strontium compounds, superconducting tapes, superconducting transformers, transformer windings
1051-8223
2800-2803
Al-Mosawi, M.K.
650b2475-f20f-4d8f-948c-1e28863b10dc
Beduz, C.
2cbc6ece-3e8b-454b-86d6-3960596bd234
Yifeng, Yang
87a50861-ac4e-40f5-a23b-af7a59df1913
Webb, M.
7668f3c0-97e4-4950-94b7-aff967108058
Power, A.
4b4103a0-e489-44a1-bf28-d8e997a1eb4b
Al-Mosawi, M.K.
650b2475-f20f-4d8f-948c-1e28863b10dc
Beduz, C.
2cbc6ece-3e8b-454b-86d6-3960596bd234
Yifeng, Yang
87a50861-ac4e-40f5-a23b-af7a59df1913
Webb, M.
7668f3c0-97e4-4950-94b7-aff967108058
Power, A.
4b4103a0-e489-44a1-bf28-d8e997a1eb4b

Al-Mosawi, M.K., Beduz, C., Yifeng, Yang, Webb, M. and Power, A. (2001) The effect of flux diverters on AC losses of a 10kVA high temperature superconducting demonstrator transformer. IEEE Transactions on Applied Superconductivity, 11 (1), 2800-2803. (doi:10.1109/77.919645).

Record type: Article

Abstract

In this paper the design, construction and characterization of a 50 Hz single phase high temperature superconducting (HTS) transformer is presented. The transformer is designed to deliver 10 kVA at 77.4 K and 20 kVA at 65 K. The transformer is made of two windings positioned at the middle limb of a three-limb iron core. The secondary winding is made of nine double pancake superconducting coils, using silver sheathed BPSCCO-2223 multifilamentary tapes with nominal critical current of 20 A (at 77.4 K and self field). The primary winding is made of copper to reduce the cost of HTS material. Utilizing a superinsulated nonmetallic doughnut shaped cryostat with low background heat leak, the AC losses in the superconducting winding have been measured by calorimetric method. Two powdered iron flux diverters have been used inside the cryostat at both ends of the superconducting winding in order to reduce the radial component of leakage flux density in the HTS tapes. The use of these flux diverters is shown to be very effective in reducing the AC losses by 40% at the nominal current

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More information

Submitted date: 16 September 2000
Published date: March 2001
Additional Information: This paper describes the design, construction and test of the first United Kingdom High temperature superconducting (HTS) transformer which was sponsored by the National Grid Company. The paper presents an outstanding research and unique experimental results which addresses the novel and significant use of magnetic flux diverters in HTS transformers for reduced losses and improved performance. It demonstrated experimentally the importance of shaping the leakage magnetic field in the end region of the winding to reduce the influence of the field component perpendicular to the broad face of the tape.Cited 8 times (3 times in 2005, 2 times in 2003, 3 times in 2002). Grade 4
Keywords: bismuth compounds, calcium compounds, critical current density (superconductivity), cryostats, high-temperature superconductors, magnetic flux, magnetic leakage, multifilamentary superconductors, power transformers, strontium compounds, superconducting tapes, superconducting transformers, transformer windings

Identifiers

Local EPrints ID: 21466
URI: https://eprints.soton.ac.uk/id/eprint/21466
ISSN: 1051-8223
PURE UUID: 0bcc68ee-cfe1-4b8c-a574-e668fbdcc396

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Date deposited: 10 Mar 2006
Last modified: 15 Jul 2019 19:24

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Contributors

Author: M.K. Al-Mosawi
Author: C. Beduz
Author: Yang Yifeng
Author: M. Webb
Author: A. Power

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