| 1. |
- Houtzager, Ernest, et al.
(författare)
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Selection and characterization of resistors for a HVDC reference divider
- 2012
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Ingår i: Conference on Precision Electromagnetic Measurements, CPEM 2012. ; , s. 197-198
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Konferensbidrag (refereegranskat)abstract
- This paper describes the selection and characterization of resistors for a 1000 kV HVDC divider. One thousand 10 MΩ resistors will be connected in series in the final design. Due to the large number of resistors only a randomly selected set has been characterized. The measured temperature and voltage coefficients of the resistors are around 1 μΩ/Ω/K and -10 μΩ/Ω/kV respectively, which make them very suitable for reaching the overall desired divider uncertainty of better than 100 μV/V.
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| 2. |
- Hällström, Jari K., et al.
(författare)
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Performance of a wideband 200-kV HVDC reference divider module
- 2014
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Ingår i: IEEE Transactions on Instrumentation and Measurement. - 0018-9456 .- 1557-9662. ; 63:9, s. 2264-2270
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Tidskriftsartikel (refereegranskat)abstract
- This paper describes the design and performance of a wideband high-voltage dc (HVDC) reference divider module. The module has a nominal voltage of 200 kV, and it has been designed so that a number of modules can be stacked to extend voltages up to 1000 kV. The module, or a stack of modules, will be used for traceable calibration of HVDC measuring systems in customers' laboratories. The first priority in the design was the accuracy of HVDC measurements. In addition, the divider was designed to have wide bandwidth, both to enable measurement of ripple voltages and to prevent damage during possible flashovers.
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| 3. |
- Hällström, Jari, et al.
(författare)
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Performance of a Modular Wideband HVDC Reference Divider for Voltages up to 1000 kV
- 2015
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Ingår i: IEEE Transactions on Instrumentation and Measurement. - 0018-9456 .- 1557-9662. ; 64:6, s. 1390-1397
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Tidskriftsartikel (refereegranskat)abstract
- This paper describes the design and performance of a modular wideband high-voltage dc (HVDC) reference divider with a ratio uncertainty of less than 0.005% at 1000 kV. The divider has a maximum nominal voltage of 1000 kV when five 200-kV modules are stacked on top of each other. The divider is used for traceable calibration of HVDC measuring systems in customers' laboratories. The first priority in the design was the accuracy of HVDC measurements. In addition, the divider was designed to have wide bandwidth, both to enable measurement of ripple voltages and to prevent damage during possible flashovers.
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| 4. |
- Kohlmann, Johannes, et al.
(författare)
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A quantum standard for sampled electrical measurements-Main goals and first results of the EMRP project Q-WAVE
- 2014
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Ingår i: 29th Conference on Precision Electromagnetic Measurements, CPEM 2014. ; , s. 522-523
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Konferensbidrag (refereegranskat)abstract
- Josephson voltage standards are well established for use at dc and low-frequency ac voltages. The increasing demand i) to provide traceability for arbitrary waveforms, ii) to extend the range of use to higher frequencies, and iii) to improve the accuracy is being addressed in the project Q-WAVE, which is jointly funded by the European Union and the participating countries within the European Metrology Research Programme (EMRP). Here, sampling measurements and procedures using binary-divided 1 V and 10 V arrays are investigated. In addition, a quantum-based analogue-to-digital converter for direct measurements of arbitrary waveforms is under development. It will contain several Josephson arrays in series biased by a pulse drive based on opto-electronics, in order to increase the output voltage.
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