Transient DC Over-Voltage Protection for ITER PF AC/DC Converter

The International Thermonuclear Experimental Reactor (ITER) poloidal field (PF) AC/DC converters are composed by thyristor-based phase controlled converter modules. As the core component of ITER PF AC/DC converter, the thyristor is very sensitive to over-voltage and damaged in microseconds, therefore, the transient over-voltage protection strategy is desperately essential to ensure the converter safety operation. In this paper, a nanosecond respond and high reliability protection strategy which combined by Metal Oxide Varistor (MOV) and external bypass is proposed to protect the ITER PF AC/DC converter from transient DC over-voltage. The MOV is designed to certify the fast respond in nanosecond. Moreover, a bidirectional BreakOver Diode (BOD) circuit board is designed to activate external bypass to ensure the reliability of the transient DC over-voltage protection strategy. The performance-testing platform is built to study its performance. The experiments on ITER PF AC/DC converter test facility are carried out. According to the experiment results, the external bypass is triggered by BOD board effectively and the load current is transferred to the external bypass in 2 us when BOD suffers from an over-voltage. The effectiveness of the proposed transient DC over-voltage protection strategy is verified.

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Installation and Test Programme of the ITER Poloidal Field Conductor Insert (PFCI) in the ITER Test Facility at JAEA Naka

IEEE Transactions on Applied Superconductivity ◽

10.1109/tasc.2009.2019551 ◽

2009 ◽

Vol 19 (3) ◽

pp. 1492-1495 ◽

Cited By ~ 3

Author(s):

Y. Nunoya ◽

Y. Takahashi ◽

K. Hamada ◽

T. Isono ◽

K. Matsui ◽

...

Keyword(s):

Test Facility ◽

Poloidal Field ◽

Test Programme ◽

Iter Poloidal Field

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Performance Testing of HTHP Electrostatic Precipitator at NYU PFBC Facility

Volume 3: Coal, Biomass and Alternative Fuels; Combustion and Fuels; Oil and Gas Applications; Cycle Innovations ◽

10.1115/88-gt-131 ◽

1988 ◽

Author(s):

R. Radhakrishnan ◽

P. K. Gounder ◽

S. Kavidass ◽

V. Zakkay ◽

R. Dellefield

Keyword(s):

High Pressure ◽

High Temperature ◽

Electrostatic Precipitator ◽

Collection Efficiency ◽

Operating Experience ◽

Performance Testing ◽

Test Facility ◽

Dust Collection ◽

Ongoing Research ◽

Dust Collection Efficiency

NYU has an ongoing research program which is being funded by DOE to test three types of high-pressure, high-temperature filters. The main objectives of the testing program are: (1) to establish the performance capability of the filters under high-pressure and high-temperature conditions; and (2) to evaluate the dust collection efficiency. Shakedown tests for a duration of about 50 hours was completed during October 1986. Testing of the electrostatic precipitator (ESP) is in progress. The first test with ESP was performed during the middle of November 1986. The operating experience with respect to the test facility, and in particular with the particulate sampling systems, is reported in this paper. Additionally, some test results are also discussed.

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Current sharing design of ITER poloidal field converter bridges

Fusion Engineering and Design ◽

10.1016/j.fusengdes.2018.04.061 ◽

2018 ◽

Vol 132 ◽

pp. 37-44 ◽

Cited By ~ 2

Author(s):

Yong Yang ◽

Zhiquan Song ◽

Jun Tao ◽

Xiuqing Zhang ◽

Ming Zhang ◽

...

Keyword(s):

Poloidal Field ◽

Current Sharing ◽

Iter Poloidal Field ◽

Poloidal Field Converter

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Dynamic Stability Analysis of High-Power DC Reactor for ITER Poloidal Field Converter

Journal of Fusion Energy ◽

10.1007/s10894-014-9785-3 ◽

2014 ◽

Vol 34 (2) ◽

pp. 202-206 ◽

Cited By ~ 6

Author(s):

C. Li ◽

Zhiquan Song ◽

P. Fu ◽

Peng Wang ◽

Ming Zhang ◽

...

Keyword(s):

Stability Analysis ◽

Dynamic Stability ◽

High Power ◽

Poloidal Field ◽

Dc Reactor ◽

Iter Poloidal Field ◽

Poloidal Field Converter

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Performance Testing of a Large-Format X-ray Reflection Grating Prototype for a Suborbital Rocket Payload

Journal of Astronomical Instrumentation ◽

10.1142/s2251171720500178 ◽

2020 ◽

Vol 09 (04) ◽

pp. 2050017

Author(s):

Benjamin D. Donovan ◽

Randall L. McEntaffer ◽

Casey T. DeRoo ◽

James H. Tutt ◽

Fabien Grisé ◽

...

Keyword(s):

Probability Distribution ◽

Confidence Level ◽

Posterior Probability ◽

Performance Testing ◽

Test Facility ◽

Finite Limit ◽

Max Planck ◽

X Ray ◽

Posterior Probability Distribution ◽

Reflection Grating

The soft X-ray grating spectrometer on board the Off-plane Grating Rocket Experiment (OGRE) hopes to achieve the highest resolution soft X-ray spectrum of an astrophysical object when it is launched via suborbital rocket. Paramount to the success of the spectrometer are the performance of the [Formula: see text] reflection gratings populating its reflection grating assembly. To test current grating fabrication capabilities, a grating prototype for the payload was fabricated via electron-beam lithography at The Pennsylvania State University’s Materials Research Institute and was subsequently tested for performance at Max Planck Institute for Extraterrestrial Physics’ PANTER X-ray Test Facility. Bayesian modeling of the resulting data via Markov chain Monte Carlo (MCMC) sampling indicated that the grating achieved the OGRE single-grating resolution requirement of [Formula: see text] at the 94% confidence level. The resulting [Formula: see text] posterior probability distribution suggests that this confidence level is likely a conservative estimate though, since only a finite [Formula: see text] parameter space was sampled and the model could not constrain the upper bound of [Formula: see text] to less than infinity. Raytrace simulations of the tested system found that the observed data can be reproduced with a grating performing at [Formula: see text]. It is therefore postulated that the behavior of the obtained [Formula: see text] posterior probability distribution can be explained by a finite measurement limit of the system and not a finite limit on [Formula: see text]. Implications of these results and improvements to the test setup are discussed.

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A Newly Designed Modular ZnBr2 Single Cell Structure

Batteries ◽

10.3390/batteries6020027 ◽

2020 ◽

Vol 6 (2) ◽

pp. 27

Author(s):

Zongqiang Pang ◽

Yutao Gong ◽

Ming Yuan ◽

Xin Li

Keyword(s):

Energy Density ◽

Single Cell ◽

Modular Design ◽

High Reliability ◽

Low Cost ◽

Cell Structure ◽

Performance Testing ◽

High Energy ◽

High Energy Density ◽

Symmetrical Structure

We describe a ZnBr2 single cell which has a highly modular symmetrical structure. With designed polyethylene shell frames, membrane frame and composite titanium-carbon felt electrodes, it has a higher energy density and is more flexible compared with traditional flow batteries. We repeatedly tested its performance, which showed good tightness, high reliability and a high energy efficiency of 75%. Due to the special symmetrical structure and modular design, it is easy to assemble and disassemble, which makes it suitable as a test platform for electrodes, membranes and electrolyte performance testing. The designed modular flow cell has low cost and high energy density, and can provide good guidance for flow battery research.

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Transient Electrical Voltages Within ITER Poloidal Field Coils

IEEE Transactions on Applied Superconductivity ◽

10.1109/tasc.2011.2180277 ◽

2012 ◽

Vol 22 (3) ◽

pp. 9501304-9501304

Author(s):

A. Winkler ◽

W. H. Fietz ◽

S. Fink ◽

M. Noe

Keyword(s):

Poloidal Field ◽

Iter Poloidal Field

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Design of Small Centrifugal Compressors Performance Test Facility

Volume 5: Turbo Expo 2004, Parts A and B ◽

10.1115/gt2004-53821 ◽

2004 ◽

Author(s):

Fahad A. Al-Sulaiman ◽

Amro M. Al-Qutub

Keyword(s):

Performance Test ◽

Performance Testing ◽

Selection Procedure ◽

Power Input ◽

Test Facility ◽

Design Stage ◽

Centrifugal Compressors ◽

Drive Unit ◽

Actual Performance ◽

Wide Range

Actual performance testing is a key element in the design stage, development and troubleshooting of centrifugal compressors. The present work discusses the procedure for designing the experimental setup and the selection of drive unit for variable centrifugal compressors sizes. It starts with setting criteria of selection. A survey over different types of drive units and facility setup was conducted. It was found that the electric drive unit with the aid of transmission for stepping-up the speeds is the most suitable type. This is due mainly to the excellent control property of electric motors allowing for wide range of operational speed and power. A new methodology was developed for selecting operational power and speeds of the drive unit for different sizes of impellers. The code, used for the analysis, was developed by the authors. It calculates the range of input power, input torque, and rotational speeds, as well as, the mass flow rate, total pressure and temperature ratios for different sizes of impellers. This will aid in selecting the proper instrumentation for the experiments. The code used for design methodology is based on one dimensional through flow formulation and validated with experimental results in the literature. It is expected that the present methodology will enhance selection procedure for designing compressor test facility.

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