Computation of Transient Electromagnetic Fields Due to Switching in High-Voltage Substations

Musa, B. U.; Siew, W.H.; Judd, M.D.

doi:10.1109/tpwrd.2009.2034008

Cited by 29 publications

(7 citation statements)

References 14 publications

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“…In the zero time approximately, the disturbance pulses have been produced with the same as the situation that fault state without voltage source (see Fig. 8), but the amplitude of the disturbance pulses caused by VCB is smaller, which indicates that the EMI generally decreases with the increase of the distance to source [3], and obvious disturbance pulses have been produced during the breaking arcing process and around the current zero of pole-mounted switch.…”

Section: B Influence Of Pole-mounted Switch's Breaking On the Outputmentioning

confidence: 79%

EM Measurements Between MV Switching Sources and Colocated Sensitive Circuit

Huang

Ruan

et al. 2015

IEEE Trans. Electromagn. Compat.

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With the development and increasing use of intelligent vacuum circuit breaker (VCB), the electromagnetic compatibility problem between VCBs and their low-voltage electronic equipment is becoming increasingly prominent. Switching operations of circuit breakers are known to be serious sources of electromagnetic interference (EMI) to their secondary equipment, which can lead to the control and protection devices display error and malfunction. Hence, it is very important to study the EMI problem of the secondary equipment (such as current transformer (CT), PT, and controller) caused by the operations of circuit breakers. This paper carried out the tests of a 10 kV medium-voltage outdoor polemounted switch by a synthetic test circuit with large current and high impulse voltage sources, and collected the current signals of the secondary circuit at the same time, then obtained the frequency and energy distributions of the disturbance signals, caused by the breaking operation of pole-mounted switch, by time and frequency characteristic analysis with the wavelet analysis. Results show that the secondary side of the CT and the feeder terminal unit (FTU) controller are bearing EMI when pole-mounted switch is in operation and the distribution of the frequency spectrum is wide. The most serious disturbance appears at the time of arc current passing zero and the frequency distribution is mainly in 7.81-15.63 MHz. The EMI caused by transient recovery voltage is mainly distribution in 31.25-125.0 MHz. The maximum amplitude of disturbance pulses is about 4.5 times as large as that of the normal case. The results can provide a reference to the measures against the EMI for the pole-mounted switch's FTU controller. Index Terms-Current transformer (CT), electromagnetic interference (EMI), feeder terminal unit (FTU), frequency distribution, pole-mounted switch, synthetic test, transient recovery voltage (TRV), wavelet analysis.

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Section: B Influence Of Pole-mounted Switch's Breaking On the Outputmentioning

confidence: 79%

EM Measurements Between MV Switching Sources and Colocated Sensitive Circuit

Huang

Ruan

et al. 2015

IEEE Trans. Electromagn. Compat.

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“…The DCU is in the extension line of Y direction, 30 cm away from the copper bar. When the transient current i flows through the copper bar, due to the skin effect, the current will tend to both ends of the copper bar [18], and the skin depth d can be expressed as Equation ().

d = \sqrt{\frac{2}{ω μ γ}}

where ω is the current angular frequency, μ is the permeability and γ is the conductivity.…”

Section: Multi‐process Transient Equivalent Model Of Transient Mf Cal...mentioning

confidence: 99%

Analysis for magnetic field disturbance of hybrid DC circuit breaker during breaking

Shen

et al. 2021

High Voltage

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The high current of hybrid DC circuit breaker (HCB) in the process of breaking generates strong transient magnetic field (MF), which may interfere with the normal operation of driver control units (DCUs). Therefore, the analysis for transient MF disturbance is of great significance. Due to the large space scale of HCB, with the large number of power electronic devices, the numerical calculation method has the disadvantages of large consumption of resources and slow calculation speed in solving the transient MF inside the HCB. In this study, the current generation mechanism of a 500 kV HCB is analysed, and the equivalent current path is obtained by considering the skin effect. Combined with the temporal and spatial distribution of transient current, the multi-process transient equivalent model of transient MF calculation is established, and the model has the advantages of high precision and high speed. Then, the breaking experiment of HCB is carried out, and the transient MF near the DCU is measured. The experiment results verify the validity of the model. Furthermore, the disturbance of transient MF at the DCU of the transfer branch during breaking 25 kA current is analysed.This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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“…Thanks to the thin-wire modelling techniques developed recently [2][3][4][5], wire structures can be constructed in a coarse FDTD mesh to reduce computation time and memory space in simulations. Such techniques have been successfully applied to analyze EM transients in electric power systems, such as grounding systems [6], high voltage substations [7,8], overhead lines [9][10][11][12][13][14][15], transmission towers [16][17][18], vertical conductors [19][20][21], wind turbine generator systems [22], electrical wirings in buildings [23] and electrified railway systems [24].…”

Section: Introductionmentioning

confidence: 99%

Thin-Wire Models for Inclined Conductors With Frequency-Dependent Losses

Chen

2020

IEEE Trans. Power Delivery

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This paper presents the FDTD thin-wire models of lossy wire structures with arbitrary inclination for transient analysis, which is difficult to address using traditional FDTD methods. The frequency-dependent losses of the conductors are fully taken into account, and the vector fitting technique is applied to deal with frequency-dependent parameters for time-domain analysis. The bidirectional coupling within the lossy coaxial conductors is modelled. The currents in inner and outer conductors are not necessarily balanced. Three cases are presented for the investigation of wave propagation velocity, wave attenuation, and current distribution. These data are compared with analytical results and numerical results using other models. It is found that the proposed thin-wire models can depict the transient behaviors in the lossy inclined conductors with the velocity error of less than 1%, and the attenuation error of less than 1.5%. Keywords -finite-difference time-domain (FDTD), thin-wire model, inclination, frequency-dependent loss I.

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Computation of Transient Electromagnetic Fields Due to Switching in High-Voltage Substations

Cited by 29 publications

References 14 publications

EM Measurements Between MV Switching Sources and Colocated Sensitive Circuit

EM Measurements Between MV Switching Sources and Colocated Sensitive Circuit

Analysis for magnetic field disturbance of hybrid DC circuit breaker during breaking

Thin-Wire Models for Inclined Conductors With Frequency-Dependent Losses

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