Study on Additional Dynamic Component of Electronic Current Transducer Based on Rogowski Coil and Its Test Approach

Shi, Jing; Huang, Qi; Tang, Fan; Lee, Wei-Jen; Zhang, Zhenyuan

doi:10.1109/tia.2020.2965866

Cited by 8 publications

(5 citation statements)

References 9 publications

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“…Considering the frequency of the current I 1 and the value of the integral resistance R in our application scenario, the capacitance and resistance of the wire are ignored. Therefore, when the cross section of the core is rectangular, the following formula exists [19]:…”

Section: Requirement For the Current Sensor For Framentioning

confidence: 99%

\begin{equation}{\mathrm{j}}\omega M{{I}_1} = {\mathrm{j}}\omega L{{I}_2} + {{U}_2} = {\mathrm{j}}\omega L{{I}_2} + R{{I}_2}\end{equation}

\begin{equation}L = Mn = \frac{{{{{{\mu}}}_{\mathrm{0}}}{{\mu }_{\mathrm{r}}}h{{n}^2}}}{{2{{\pi}}}}\ln \frac{{{{d}_2}}}{{{{d}_1}}}\end{equation}

\begin{equation}{{Z}_{\mathrm{C}}}\left( {\mathrm{j}\omega} \right) = \frac{{{{U}_2}}}{{{{I}_1}}} = \frac{{{\mathrm{j}}\omega MR}}{{{\mathrm{j}}\omega L + R}}\end{equation}

\begin{equation}{{f}_{\mathrm{L}}} = \frac{1}{{2{{\pi}}}}\frac{R}{L}\end{equation}

where j is the sign of the imaginary part of the variable. n is the number of turns of the coil.…”

Section: Problem Of Magnetic Field Saturation In a Current Sensor Dur...mentioning

confidence: 99%

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Power frequency magnetic field interference suppression method for online frequency response analysis of power transformers

Cheng,

Liu,

Sha

et al. 2024

The Journal of Engineering

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Frequency response analysis is widely used for the offline diagnosis of winding deformations in power transformers. To apply this approach to a working transformer, the magnitude of the response current needs to be measured by using Rogowski coil sensors across a load current. The saturation of the power frequency magnetic field in these current sensors must be prevented to ensure accurate measurement of such small response currents. Here, a method is presented to suppress the power frequency magnetic field using a sensing system including a special connection of three‐phase current sensors based on the sum of the three‐phase power frequency load currents of the transformer being close to zero. Each sensor comprises two secondary coils: a measuring coil and an anti‐saturation coil. The anti‐saturation coils are connected in parallel with one another through small inductors to eliminate the power frequency magnetic field in the cores of the sensors. Theoretical analysis is used to derive a solution for this system. The experimental results verify the proposed method as enabling the sensors to function with a transformer carrying a load current of 2333 A.

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Section: Requirement For the Current Sensor For Framentioning

confidence: 99%

\begin{equation}{\mathrm{j}}\omega M{{I}_1} = {\mathrm{j}}\omega L{{I}_2} + {{U}_2} = {\mathrm{j}}\omega L{{I}_2} + R{{I}_2}\end{equation}

\begin{equation}L = Mn = \frac{{{{{{\mu}}}_{\mathrm{0}}}{{\mu }_{\mathrm{r}}}h{{n}^2}}}{{2{{\pi}}}}\ln \frac{{{{d}_2}}}{{{{d}_1}}}\end{equation}

\begin{equation}{{Z}_{\mathrm{C}}}\left( {\mathrm{j}\omega} \right) = \frac{{{{U}_2}}}{{{{I}_1}}} = \frac{{{\mathrm{j}}\omega MR}}{{{\mathrm{j}}\omega L + R}}\end{equation}

\begin{equation}{{f}_{\mathrm{L}}} = \frac{1}{{2{{\pi}}}}\frac{R}{L}\end{equation}

where j is the sign of the imaginary part of the variable. n is the number of turns of the coil.…”

Section: Problem Of Magnetic Field Saturation In a Current Sensor Dur...mentioning

confidence: 99%

Power frequency magnetic field interference suppression method for online frequency response analysis of power transformers

Cheng,

Liu,

Sha

et al. 2024

The Journal of Engineering

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show abstract

“…As shown in formula (14) and formula (15), the design of virtual capacitive voltage divider and virtual Rogowski coil in relay is related to the transformer parameters, and the measurement error of the parameters will affect the equal transfer effect of voltage and current signals. Therefore, the effect of parameter errors on accuracy of the algorithm shall be analysed.…”

Section: Effect Of Measurement Error Of Transformer Parameters On Acc...mentioning

confidence: 99%

“…Figure 9 shows the data transfer links of the conventional distance relay. Generally, the integration processing of the differential signals from the Rogowski coil and the capacitive voltage divider is performed in the merging unit [14, 18].…”

Section: Basic Principlementioning

confidence: 99%

“…After being processed by the integrator, an abnormal current signal is output from the transformer and lasts for a long duration, causing mal-operation of the relay. The literature [14] analyses the causes of abnormal output in the electronic transformer during switching operation. During the operation of power system, high-frequency transient signals will be generated.…”

Section: Introductionmentioning

confidence: 99%

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An improved distance relay based on electronic transformer by using instantaneous value after equal transfer processes

Wen

Shi³

et al. 2022

IET Generation Trans & Dist

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This paper analyses the formation mechanism of the transmission distortion of electronic voltage transformer, and points out that the integrator will magnify the transient transfer error and superimpose the dynamic additional component on the output signal, which may cause the transfer distortion of voltage signal in serious cases. To restrict the electronic transformer transient variable error effect on distance relay, a distance relay method using instantaneous value after equal transfer processes is proposed. It directly uses output differential signals of the capacitor voltage divider and Rogowski coil. The capacitor voltage divider and Rogowski coil are decomposed into several typical variable link in series. The virtual digital transfer link, which is constructed by the digital filter, is used to compensate for the difference parts of the transfer link, so that the voltage and current signals pass through the same transfer link. It can mitigate the influence of voltage and current signal transfer difference on the calculation accuracy of distance relay. The simulation results show that the proposed distance relay method has fast operation speed and is less affected by abnormal voltage and current signal transfer, and its performance is better than existing distance relay methods.

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The Influence of Dynamic Response Characteristics of Electronic Current Transformer on Line Differential Protection

Xing

Zhong

et al. 2020

2020 5th International Conference on Power and Renewable Energy (ICPRE)

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Study on Additional Dynamic Component of Electronic Current Transducer Based on Rogowski Coil and Its Test Approach

Cited by 8 publications

References 9 publications

Power frequency magnetic field interference suppression method for online frequency response analysis of power transformers

Power frequency magnetic field interference suppression method for online frequency response analysis of power transformers

An improved distance relay based on electronic transformer by using instantaneous value after equal transfer processes

The Influence of Dynamic Response Characteristics of Electronic Current Transformer on Line Differential Protection

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