Onsite Calibration of a Current Transformer Using a Rogowski Coil

Suomalainen, Esa-Pekka; Hällström, Jari

doi:10.1109/tim.2008.2007031

Cited by 58 publications

(25 citation statements)

References 4 publications

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“…This type of equipment are commonly designed for low voltages between primary and secondary windings. Although there are proposals for testing at HVs, some of them [11], [12] require very complex equipment, or does not consider capacitive effects [13]. For this paper, isolations and shields were added to a low voltage standard CT and a current source to allow working at HVs, and to avoid stray capacitance influences (Fig.…”

Section: A Calibration With Simultaneous Application Of Current and mentioning

confidence: 99%

Testing Methods for Measuring the Effects of Stray Capacitances on High-Voltage Current Transformers

Aristoy

Santos

Slomovitz

2015

IEEE Trans. Instrum. Meas.

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This paper evaluates different measuring systems to estimate the effect of stray capacitances between primary and secondary windings on current transformers (CTs) used in high-voltage power networks. All windings are at nearly ground potential during laboratory calibration because this is the typical configuration for almost all CT's calibration systems. However, in service, the primary winding is at high potential, so that additional currents flow through the load due to stray capacitances between primary and secondary windings, even if the CT has an electrostatic shield for reducing these capacitances. This effect changes the CT errors determined at no potential. Experimental determination of the variation of ratio and phase displacement errors between both working conditions is evaluated for a set of different CTs using different measuring systems. These systems include from the simplest low-voltage bridge capacitance measurement to the most complex one that simultaneously applies current and voltage.Index Terms-Current transformer (CT), high voltage (HV), instrument transformer, isolation, parasitic capacitance, test.

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Section: A Calibration With Simultaneous Application Of Current and mentioning

confidence: 99%

Testing Methods for Measuring the Effects of Stray Capacitances on High-Voltage Current Transformers

Aristoy

Santos

Slomovitz

2015

IEEE Trans. Instrum. Meas.

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“…Active ECTs with Rogowski coil are the most practical and have been widely applied after many years development research. Rogowski coils used to be applied in high pulse current measuring and large direct current measuring [5][6][7][8][9]. Owing to their measuring output power being small, Rogowski coils are not able to drive metering and protection devices in traditional substations [10].…”

Section: Introductionmentioning

confidence: 99%

Research on Proximity Magnetic Field Influence in Measuring Error of Active Electronic Current Transformers

Yang

et al. 2016

MATEC Web of Conferences

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Abstract. The principles of the active electronic current transformer (ECT) are introduced, and the mechanism of how a proximity magnetic field can influence the measuring of errors is analyzed from the perspective of the sensor section of the ECT. The impacts on active ECTs created by three-phase proximity magnetic field with invariable distance and variable distance are simulated and analyzed. The theory and simulated analysis indicate that the active ECTs are sensitive to proximity magnetic field under certain conditions. According to simulated analysis, a product structural design and the location of transformers at substation sites are suggested for manufacturers and administration of power supply, respectively.

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“…[6][7][8][9][10][11][12] Since the calibration period of ECTs needs to be shortened, more power off loss will be generated if the conventional calibration methods are adopted. In addition, the run time of ECTs is not long, and the monitoring of the error changes of ECTs during long-term operation is very meaningful.…”

Section: Introductionmentioning

confidence: 99%

An accurate online calibration system based on combined clamp-shape coil for high voltage electronic current transformers

Zhou

2013

Review of Scientific Instruments

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Electronic transformers are widely used in power systems because of their wide bandwidth and good transient performance. However, as an emerging technology, the failure rate of electronic transformers is higher than that of traditional transformers. As a result, the calibration period needs to be shortened. Traditional calibration methods require the power of transmission line be cut off, which results in complicated operation and power off loss. This paper proposes an online calibration system which can calibrate electronic current transformers without power off. In this work, the high accuracy standard current transformer and online operation method are the key techniques. Based on the clamp-shape iron-core coil and clamp-shape air-core coil, a combined clamp-shape coil is designed as the standard current transformer. By analyzing the output characteristics of the two coils, the combined clamp-shape coil can achieve verification of the accuracy. So the accuracy of the online calibration system can be guaranteed. Moreover, by employing the earth potential working method and using two insulating rods to connect the combined clamp-shape coil to the high voltage bus, the operation becomes simple and safe. Tests in China National Center for High Voltage Measurement and field experiments show that the proposed system has a high accuracy of up to 0.05 class.

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Onsite Calibration of a Current Transformer Using a Rogowski Coil

Cited by 58 publications

References 4 publications

Testing Methods for Measuring the Effects of Stray Capacitances on High-Voltage Current Transformers

Testing Methods for Measuring the Effects of Stray Capacitances on High-Voltage Current Transformers

Research on Proximity Magnetic Field Influence in Measuring Error of Active Electronic Current Transformers

An accurate online calibration system based on combined clamp-shape coil for high voltage electronic current transformers

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