High voltage testing of short samples of 110 kV high temperature power superconducting transmission cables with the HAIhKE facility

Fink, S.; Bauer, K.; Ulbricht, A.; Zwecker, V.

doi:10.1109/icdl.2002.1022726

Cited by 2 publications

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“…The maximum impulse voltage value of 370 kV is determined by the available Marx generator and will even decrease for larger capacitive loads. Higher impulse test voltages would be possible in collaboration with the University of Karlsruhe where the same type of bushing was already operated till 475 kV [3]. The facility is presently used with a simple sphere to plain gap to obtain basic data for the high voltage design of a fault current limiter.…”

Section: Discussionmentioning

confidence: 98%

“…The sphere with a diameter of 50 mm is located on the bottom end of a rod which is fixed with the other end on a spindle above the top of a bushing. Because the capacitor bushing is a spare part from a cable test facility [3] it limits the maximum voltages to its original design values which are 200 kVrms for AC operation and 550 kV for the LI tests. In addition the cold field grading part of the capacitor bushing is optimised for operation in liquid nitrogen which makes it necessary to assemble a disk (named "bubble protector" in Fig.…”

Section: A Cryostat Test Sample and Bushingmentioning

confidence: 99%

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A facility for testing the dielectric strength of liquid nitrogen

Fink

Noë

2008

2008 IEEE International Conference on Dielectric Liquids

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For superconducting high voltage devices liquid nitrogen can not only be used as cooling liquid but also for electrical insulation purposes. Under the programme of a 110 kV fault current limiter project the breakdown and withstand voltages of liquid nitrogen are examined in a new cryogenic high voltage test facility named "Fatelini". Target withstand voltages for this new facility itself are 200 kV AC rms and 300 kV for standard lightning impulses. The liquid nitrogen can be pressurized till 0.3 MPa. Firstly a sphere to plane arrangement is used where the gap length can be adjusted in steps of 1 mm from outside of the cryostat in order to avoid long warm up and cool down times. The test facility is described in detail and the maximum voltage values which are reached so far are presented.

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Section: Discussionmentioning

confidence: 98%

Section: A Cryostat Test Sample and Bushingmentioning

confidence: 99%

A facility for testing the dielectric strength of liquid nitrogen

Fink

Noë

2008

2008 IEEE International Conference on Dielectric Liquids

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“…The windings and high-voltage bushings will operate in 70-K, 2-bar single-phase nitrogen. Although concepts and development projects for cryogenic bushings date back nearly four decades and have been described many times previously, these bushings were generally purpose-built for each project [1][2][3][4][5][6][7][8][9][10]. For HTS power equipment to be reliable and economically competitive, an off-the-shelf commercial source is preferable.…”

Section: Introductionmentioning

confidence: 99%

Cryogenic lifetime tests on a commercial epoxy resin high voltage bushing

Schwenterly

Pleva

2012

AIP Conference Proceedings

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High-temperature superconducting (HTS) power devices operating in liquid nitrogen frequently require high-voltage bushings to carry the current leads from the superconducting windings to the room temperature grid connections. Oak Ridge National Laboratory (ORNL) is collaborating with Waukesha Electric Systems (WES), SuperPower (SP), and Southern California Edison (SCE) to develop and demonstrate an HTS utility power transformer. Previous dielectric high voltage tests in support of this program have been carried out in test cryostats with commercial epoxy resin bushings from Electro Composites Inc. (ECI). Though the bushings performed well in these short-term tests, their long-term operation at high voltage in liquid nitrogen (LN) needs to be verified for use on the utility grid. Long-term tests are being carried out on a sample 28-kV-rms-class ECI bushing. The bushing has a monolithic cast, cycloaliphatic resin body and is fire-and shatter-resistant. The test cryostat is located in an interlocked cage and is continuously energized at 25 kVac rms. LN is automatically refilled every 9.5 hours. Partial discharge, capacitance, and leakage resistance tests are periodically performed to check for deviations from factory values. At present, over 2400 hours have been accumulated with no changes in these parameters. The tests are scheduled to run for four to six months.

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High voltage testing of short samples of 110 kV high temperature power superconducting transmission cables with the HAIhKE facility

Cited by 2 publications

References 0 publications

A facility for testing the dielectric strength of liquid nitrogen

A facility for testing the dielectric strength of liquid nitrogen

Cryogenic lifetime tests on a commercial epoxy resin high voltage bushing

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