Abstract
In order to calibrate high voltage d.c. dividers in
testing laboratories and HVDC converter substations, a
new measurement infrastructure for on-site calibration
has recently been established. Two 1000 kV voltage
dividers have been built, a stationary reference divider
at the SP Technical Research Institute of Sweden, and a
wide-band modular HVDC divider for on-site assessment
capable also of measuring ripple voltage and protected
against damage owing to transients. The two 1000 kV
voltage dividers were calibrated and their performance
verified in June 2013. The scale factors of the two
dividers were determined in this comparison campaign,
with a combined expanded uncertainty better than 20 µV/V
at 1000 kV for both dividers. The stationary reference
divider is based on wire wound resistors. The reference
divider has since June 2013 been upgraded by painting the
housing using a semi-conductive paint, intended to
minimize space charge build up on the surface. The
modular 1000 kV system consists of up to five stackable
200 kV modules and a low voltage arm, which enables the
set-up of different divider configurations in 200 kV
steps up to a full 1000 kV system. No modifications have
been made for the modular 1000 kV divider since June
2013. This paper presents the results of a recalibration
and inter-comparison of the dividers in spring 2015. A
series-parallel method based on Hamon connection of
resistors has been introduced for calibration of the
modular divider. The inter-comparison of the dividers at
full 1000 kV voltage has been repeated, and their claimed
performance confirmed. Both dividers are verified to have
an expanded measurement uncertainty of 20 µV/V. The long
term stability for the resistance of the high voltage arm
of the modular divider, determined with low voltage
calibration, shows an unprecedented stability with
deviations less than 2o10 6.
Original language | English |
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Title of host publication | Proceedings of the 19th International Symposium on High Voltage Engineering, Pilsen, Czech Republic, August, 23 – 28, 2015 |
Publisher | University of West Bohemia |
Number of pages | 5 |
Publication status | Published - 2015 |
MoE publication type | B3 Non-refereed article in conference proceedings |
Event | 19th International Symposium on High Voltage Engineering, ISH 2015 - Pilsen, Czech Republic Duration: 23 Aug 2015 → 28 Aug 2015 Conference number: 19 |
Conference
Conference | 19th International Symposium on High Voltage Engineering, ISH 2015 |
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Abbreviated title | ISH 201 |
Country/Territory | Czech Republic |
City | Pilsen |
Period | 23/08/15 → 28/08/15 |
Keywords
- metrology
- calibration
- measurement
- Rogowski coil
- high current