Frequency Response of HV Test Transformers and the Associated Measurement Problems

Olivier, G.; Bouchard, R.-P.; Gervais, Y.; Mukhedkar, D.

doi:10.1109/tpas.1980.319620

Cited by 20 publications

(5 citation statements)

References 1 publication

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“…Another disadvantage of VTs and CCVDs is their poor frequency response. This issue was observed as early as in the late 1970s [1], and the development of correction techniques followed [2]. Research of frequency responses and the development of correction methods continue to this day.…”

Section: Introductionmentioning

confidence: 99%

New Sensor for Medium- and High-Voltage Measurement

2021

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Measurements of medium and high voltages in a power grid are normally performed with large and bulky voltage transformers or capacitive dividers. Besides installation problems, these devices operate in a relatively narrow frequency band, which limits their usability in modern systems that are saturated with power electronic devices. A sensor that can be installed directly on a wire and can operate without a galvanic connection to the ground may be used as an alternative voltage measurement device. This type of voltage sensor can complement current sensors installed on a wire, forming a complete power acquisition system. This paper presents such a sensor. Our sensor is built using two dielectric elements with different permeability coefficients. A finite element method simulation is used to estimate the parameters of a constructed sensor. Besides simulations, a laboratory model of a sensor was built and tested in a medium-voltage substation. Our results provide a proof of concept for the presented sensor. Some errors in voltage reconstruction have been traced to an oversimplified data acquisition and transmission system, which has to be improved during the further development of the sensor.

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Section: Introductionmentioning

confidence: 99%

New Sensor for Medium- and High-Voltage Measurement

2021

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“…The parallel connection of planar cores magnetic circuit was adopted as a unit, and several units were cascaded to form the high-voltage transformer. Cascade transformers have already been used for high-voltage test systems [9] and multilevel PWM inverters applications [10]. In this paper, the cascade transformer has been used for high-frequency high-voltage applications.…”

Section: Introductionmentioning

confidence: 99%

Design of High Power Density Transformer

DING¹

2017

dtetr

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Abstract. The traditional high-voltage high-frequency transformer has a drawback of low power density due to the rigorous requirements of high voltage insulation. This paper proposes a new configuration for the magnetic core based on planar EE cores. The parallel connection of planar cores was adopted as a unit, and several units were cascaded to form the high-voltage transformer. The electrical potential distribution of the proposed transformer is more uniform than a traditional transformer, and enables a decrease in the insulation distances. The mechanical configuration of a laboratory prototype is discussed, as well as the electrical, parasitic, and thermal behaviors.

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“…Power quality assessment requires high-performance current and voltage transducers [9], which in particular should guarantee adequate accuracy in the presence of multitone signals. When focusing on voltage transducers, the usual approach assumes that it can be considered linear time invariant (LTI), so that it can be characterized by its frequency response function (FRF) [10]- [12], which in turn can be easily measured, for example, by changing the frequency of a sinusoidal excitation. Since transducers such as measurement transformers may exhibit a nonlinear behavior [13], [14], an accurate characterization should be based on the complex test signals.…”

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confidence: 99%

Metrological Characterization of a Signal Generator for the Testing of Medium-Voltage Measurement Transducers

Faifer

Ottoboni

Toscani

et al. 2015

IEEE Trans. Instrum. Meas.

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Nowadays, voltage transducers in medium-voltage (MV) distribution networks operate in nonsinusoidal conditions while their calibration is still based on simple sine-wave tests. A more significant characterization could be achieved using complex multitone signals. However, this requires an MV generator able to apply arbitrary voltage waveforms to the transducer under test. The authors have recently proposed a simple MV signal generator that can be effectively employed for this purpose. In this paper, the performance of this MV generator has been carefully analyzed. A characterization procedure based on multisine excitation has been proposed and tested. In particular, the main causes of uncertainty have been identified and their impact on the accuracy of the generated voltage evaluated. The analysis considers both linear and nonlinear effects, such as harmonic distortion and hysteresis

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Frequency Response of HV Test Transformers and the Associated Measurement Problems

Cited by 20 publications

References 1 publication

New Sensor for Medium- and High-Voltage Measurement

New Sensor for Medium- and High-Voltage Measurement

Design of High Power Density Transformer

Metrological Characterization of a Signal Generator for the Testing of Medium-Voltage Measurement Transducers

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