A wideband current transformer bridge

Mohns, E.; Meisner, Johann; Roeissle, G.; Seckelmann, M.; Korejwo, M.

doi:10.1109/amps.2013.6656217

Cited by 11 publications

(6 citation statements)

References 4 publications

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“…The supply voltage (sinusoidal or distorted) is generated by an arbitrary waveform generator coupled with a MV power amplifier. The currents i C1 and i C2 , which flow into capacitors C 1 and C 2 are converted into the voltages V CH1 and V CH2 by transimpedance amplifiers with feedback resistors R CH1 and R CH2 [20]. The ratio k a,h and phase displacement Δϕ a,h of each harmonic component h of V CH1 and V CH2 can be evaluated by making use of a twochannel digitizer based system as:…”

Section: A Measurement Methodsmentioning

confidence: 99%

Frequency Response of MV Voltage Transformer Under Actual Waveforms

Crotti

Gallo

Giordano

et al. 2017

IEEE Trans. Instrum. Meas.

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A setup for the measurement of the frequency\ud response of voltage measurement transformers under actual\ud waveform conditions is presented. It is based on a two-step\ud procedure that makes use of high voltage gas insulated capacitors\ud and a digital bridge. It allows calibrations using distorted\ud waveforms, with a fundamental tone at medium voltage level\ud and superimposed harmonics up to 20% and 15 kHz. Combined\ud standard uncertainty in the measurement of the voltage transformer\ud (VT) error is estimated at 200 µV/V for the ratio error\ud and 300 µrad for the phase displacement up to 10 kHz. First\ud applications to the measurement of the frequency response of VTs\ud with different rated primary voltages up to 50 kV are presented

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Section: A Measurement Methodsmentioning

confidence: 99%

Frequency Response of MV Voltage Transformer Under Actual Waveforms

Crotti

Gallo

Giordano

et al. 2017

IEEE Trans. Instrum. Meas.

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“…The two voltage input ranges for the MS are set to be switched automatically between 1 Vpk and 10 Vpk. To connect the secondary side of CTs (N & X), a two-channel C-to-V converter with rated input currents from 100 mA to 5 A, named SEKAM IV [12], is used as a part of the MS with low input impedances and an uncertainty of below 1 µA/A and 1 µrad. As a side effect, the different input current ranges of the SEKAM IV for both channels, enables to select for the optimal voltage input ratio of the reference and DUT current sensors for the MS.…”

Section: A Reference System For Calibrations At Power Frequencymentioning

confidence: 99%

“…2. A precise two-channel measuring system, named as VRS [12], is used for the wideband calibrations as a high-resolution analog-to-digital converter with the basic uncertainties of ± 2 µV/V or μrad at 50 Hz and with uncertainties of below ± 20 µV/V or μrad at frequencies up to 20 kHz.…”

Section: B Reference System For Wideband Calibrationsmentioning

confidence: 99%

Reference system for current sensor calibrations at power frequency and for wideband frequencies

Chen

Dubowik

Mohns

2022

2022 20th International Conference on Harmonics &Amp; Quality of Power (ICHQP)

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“…The classical voltage and current comparator bridges do not allow the calibration of all the transformers and can usually operate in a quite limited frequency range (e.g. 50 Hz, 60 Hz, 400 Hz) Current comparators have been designed for working in a wider frequency range ( [22]- [24]); moreover, systems based on the digital conversion of low voltage input signals have been introduced ([25], [26]). Anyway, they need the use of additional reference transducers for the reduction and/or conversion of the voltage/current signals to be compared.…”

Section: Introductionmentioning

confidence: 99%

Frequency calibration of voltage transformers by digital capacitance bridge

Crotti

Giordano

Modarres

et al. 2015

2015 IEEE International Workshop on Applied Measurements for Power Systems (AMPS)

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In modern power systems, several conducted disturbances and power quality phenomena are commonly experienced also at medium voltage level. Therefore, voltage and current transducers, which scale voltage/current waveforms down to levels compatible with the measuring instruments, are expected to accurately work over a proper range of amplitudes and frequencies, keeping the signal integrity needed to properly perform their measuring tasks such as energy billing, protection coordination and power quality monitoring. Thus, there is an increasing need for characterized and traceable methods to assess the performances of transducers in a wide frequency range. This paper focuses on a method for the calibration of medium voltage measurement transformers from power frequency to 2.5 kHz, which involves a two step procedure based on the use of a digital capacitance bridge. The system is designed for the characterization of voltage transformers at rated primary voltage up to 20/√3 kV, applying a harmonic frequency sweep, whose magnitude can be selected from 2% to 10% of the primary voltage

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A wideband current transformer bridge

Cited by 11 publications

References 4 publications

Frequency Response of MV Voltage Transformer Under Actual Waveforms

Frequency Response of MV Voltage Transformer Under Actual Waveforms

Reference system for current sensor calibrations at power frequency and for wideband frequencies

Frequency calibration of voltage transformers by digital capacitance bridge

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