Development and Test of a Prototype 100MVA Superconducting Generator Page: 24 of 164
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Table 3-1 - Summary of Demonstrator Test Objectives
Mechanical Cryogenic Electrical Component
PerformanceVibration
characteristics
Balancing responseThermal/heat load
Vacuum levelMechanical
integrity
Overspeed
performance
Gravity sagCritical current at
various stages
Synchronous
impedanceOpen circuit
saturationPhase imbalance
Sudden short circuitSystem
performance
Coil performance at
operating loads
Transfer coupling
with vibration
loading
Refrigeration
system3.2 Demonstrator Test Set-up
The Demonstrator test set-up included the 2000 HP induction motor stator with the HTS
rotor within, the helium transfer coupling, the cryocooler, the excitation system, and
related instrumentation.
The Demonstrator was driven by a motor large enough to spin it in air at no-load
conditions (either open circuit or short circuit). The drive motor did not have the capacity
to place the Demonstrator under any load nor were there any facilities available to receive
power from the generator. Fans provided cooling air for the stator.
This same set-up was used for high speed balancing of the HTS rotor.
3.3 Electrical Design
Though the stator was not the focus of the investigation, a detailed electrical design was
needed in order to predict performance. The stator was arranged in a three-phase, 54-slot,
2-circuit winding.
Generation 1 HTS wire from AMSC was used for the field winding of the generator. The
field winding was formed in a single coil of 605 turns positioned at the quadrature axis
along the side of a salient magnetic pole. The wire was insulated with Teflon tape with
layer separators between adjacent layers. The entire coil was cured in a mold.
The coil was supported by Inconel U-channels that were held in place using three support
studs that extend through the center of the pole along the quadrature axis. Drawings ofDOE Cooperative Agreement No. DE-FC36-02GO1 1100
3-2
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Fogarty, James M. & Bray, James W. Development and Test of a Prototype 100MVA Superconducting Generator, report, May 25, 2007; United States. (https://digital.library.unt.edu/ark:/67531/metadc881426/m1/24/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.