Analysis of electromagnetic transients in secondary circuits due to disconnector switching in 400kV air-insulated substation

Filipović-Grčić, Božidar; Uglešić, Ivo; Milardić, Viktor; Filipović-Grčić, Dalibor

doi:10.1016/j.epsr.2014.02.004

Cited by 13 publications

(5 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Traditional iron-core type IVTs and ICTs face limitations such as insulation deficiencies, mechanical strength issues, and seismic vulnerabilities in high-voltage environments. Furthermore, the effects of impulses from events such as opening and closing surges and external thunderstorms affect the device through electrostatic induction or electromagnetic flow effects [57,58]. Consequently, there has been a great deal of research conducted to introduce new approaches to enhance the reliability and stability of high-voltage measurement devices [56,[59][60][61][62][63].…”

Section: Non-conventional Instrument Transformersmentioning

confidence: 99%

Trends in Measuring Instrument Transformers for Gas-Insulated Switchgears: A Review

Kim,

Lee,

Kil

et al. 2024

Energies

View full text Add to dashboard Cite

Voltage and current measurements in high-voltage substations are fundamental for stable operation. Conventional instrument transformers (ITs) face challenges in gas-insulated switchgears (GISs), such as size, weight, accuracy limitations, and behavioral instability at abnormal voltages and currents. Non-conventional instrument transformers (NCITs) have emerged to address these issues, complying with International Electrotechnical Commission (IEC) standards and providing millivolt-level signals, enabling downsizing of GIS bays. The transition to digital substations, as mandated by IEC 61850-9-2, requires a shift from the conventional 110 V/5 A outputs to levels ranging from millivolts to volts. Electronic instrument transformers (EITs), compliant with the IEC 60044-7 and 8 standards, offer alternatives to conventional ITs with smaller sizes and wider frequency ranges. However, issues remain with EITs, including limited adoption, the necessity of separate power sources, and susceptibility to electromagnetic interference. Recent standards, transitioning to IEC 61869, focus on low-power instrument transformers (LPITs). Low-power voltage transformers (LPVTs) and low-power current transformers (LPCTs), designed with passive components, present potential solutions by directly connecting to merging units (MUs) for digital signal transmission. This review outlines the current status of various IT standards, covering conventional ITs, EITs based on IEC 60044-7 and 8, and LPITs based on IEC 61869-10 and 11. Advancements in sensor technology relevant to these standards are also explored. The paper provides insights into the evolving landscape of instrument transformers, addressing challenges and offering potential pathways for future developments in digital substations.

show abstract

Section: Non-conventional Instrument Transformersmentioning

confidence: 99%

Trends in Measuring Instrument Transformers for Gas-Insulated Switchgears: A Review

Kim,

Lee,

Kil

et al. 2024

Energies

View full text Add to dashboard Cite

show abstract

“…The dimensions of the analysis space to be solved by the FDTD method were 15 m × 10 m × 5 m. The bottom surface of the analysis space was a perfectly conducting ground plane, whereas the other five surfaces were treated as absorbing boundaries on the basis of Liao's formulation of the second order [66]. The shielded control cable was modeled using the technique presented in the previous sections: The poles and residues in (12) and (13) in Section II-A to simulate the surface transfer impedances for cores #1 and #2 were obtained by applying the XFIT to the measured results shown in Fig. 3.…”

Section: Validation Of Technique For Representing Shielded Control Ca...mentioning

confidence: 99%

“…On the other hand, numerical simulations are also practical tools for predicting electromagnetic transient phenomena and evaluating the effectiveness of countermeasures. Traditionally, circuit-theory-or transmission-line (TL)-theory-based simulation techniques have been studied for the electromagnetic transient analysis of secondary circuits [7], [8], [9], [10], [11], [12], [13], [14], [15], and simulation techniques for modeling high-frequency voltage and current transformers (VT and CT, respectively) have been proposed based on circuit elements and the use of the black-box technique [16], [17], [18], [19].…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional FDTD-Based Simulation of Lightning-Induced Surges in Secondary Circuits With Shielded Control Cables Over Grounding Grids in Substations

Tatematsu

Yamanaka

2023

IEEE Trans. Electromagn. Compat.

View full text Add to dashboard Cite

Nowadays, plenty of sensitive electronic devices are installed in secondary circuits in substations. When lightning strikes a substation and transmission line, lightning currents flow into the grounding structure of the substation through shield wires and lightning surge arresters in the primary circuit, and lightning overvoltages are induced on control cables in the secondary circuit owing to the effect of transient ground potential rises of the grounding structure and electromagnetic coupling. Shielded control cables are one of the countermeasures against lightning overvoltage induced on control cables; thus, it is useful to evaluate the effectiveness of shielded control cables for designing protection measures properly. Recently, the finite-difference time-domain (FDTD) method, which is one of the full-wave numerical approaches, has been commonly used for simulating electromagnetic transient phenomena in grounding structures, such as the grounding grids of substations. In this work, first, we studied the modeling of tape-type shielded control cables used in substations for FDTD-based electromagnetic transient analyses. Then, using the control cable model, we simulated a test platform of primary and secondary circuits in a substation and calculated the transient response of a grounding grid and voltages induced on the control cable when a lightning impulse current was injected into the grounding grid. We then compared the calculated results with the measured waveforms for validation.

show abstract

“…In addition to the overvoltage phenomenon, switching operations also produce extremely high current and voltage slew rates, di/dt, and dv/dt during the switching process. These transients can be coupled into LV equipment as well as the grounding system through the stray capacitances between the high-voltage conductors and the grounding system, followed by the galvanic connection with the grounding system [11]. These events consequently cause induced transient voltages in the circuits of HV substations.…”

Section: Introductionmentioning

confidence: 99%

Modelling of Transient Ground Potential Rise Due to Vacuum Circuit Breaker Switching in Steel Melting Plants

Eghtedarpour

2023

Preprint

View full text Add to dashboard Cite

Vacuum circuit breakers (VCB) are now widely used for switching of electric arc furnaces. However, the associated switching transients have raised many concerns and have led to failures in industrial power systems. High frequency current and voltage transients result due to prestrike phenomena during the VCB energization. This paper presents a detailed switching case study of an arc furnace VCB in a steel melting plant. The VCB prestrike phenamenon is simulated and studied using the electromagnetic transient programme. The simulation model is verified by on- site measurements. The ground potential rise during the switching process is thoroughly investigated in order to analyse the practical methods to mitigate the switching transients. Additionally, some practical aspects of physical design and installation are discussed.

show abstract

Analysis of electromagnetic transients in secondary circuits due to disconnector switching in 400kV air-insulated substation

Cited by 13 publications

References 7 publications

Trends in Measuring Instrument Transformers for Gas-Insulated Switchgears: A Review

Trends in Measuring Instrument Transformers for Gas-Insulated Switchgears: A Review

Three-Dimensional FDTD-Based Simulation of Lightning-Induced Surges in Secondary Circuits With Shielded Control Cables Over Grounding Grids in Substations

Modelling of Transient Ground Potential Rise Due to Vacuum Circuit Breaker Switching in Steel Melting Plants

Contact Info

Product

Resources

About