Statistical Analysis of Energization Overvoltages in EHV Hybrid OHL–Cable Systems

Khalilnezhad, Hossein; Popov, Marjan; Sluis, L. van der; Bos, Jorrit A.; Ametani, Akihiro

doi:10.1109/tpwrd.2018.2825201

Cited by 24 publications

(7 citation statements)

References 21 publications

(38 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The small differences in bomb characteristic and the peak time of both waves indicates that the effects of insulation stress of the two waveforms are the same (Fig. (20)). Using the proposed criterion for the trapped charge source, the transient simulations are validated with the practical values.…”

Section: -Discussionmentioning

confidence: 94%

“…The process of opening the main switch and re-closing it after a short time is a simple approach that can be used in transient state simulation to account for the trapped charge. However, this approach is not suitable for statistical switching with a large number of simulations (e.g., 400 simulations [20]). In statistical switching, a constant DC voltage is chosen on the line side with a opposite polarity with respect to the source side at a time near the closing instant.…”

Section: -Switching In Transmission Linesmentioning

confidence: 99%

See 1 more Smart Citation

Frequency modeling of trapped charge source for transmission line switching studies in presence of shunt reactor using EMTP/ATPDraw

Akafi-Mobarakeh

Shariatinasab

Vahidi

2023

Preprint

View full text Add to dashboard Cite

Insulation coordination studies are of great importance in power grid reliability. In this paper, a new method is proposed for modeling trapped charge sources (TCS) in switching transient studies. The TCS is used to take account of the voltage stored in line capacitors during reclosing operation after fault occurrence. The proposed model is designed based on the active filter concept, so it does not have the limitations of conventional TCS for simulating transient states in EMTP/ATPDraw. Given the natural frequencies of the transmission line to which the proposed TCS (PTCS) is connected, the PTCS injects the appropriate frequencies and eliminates voltage oscillations, which limit the use of TCS. To verify the efficiency of the PTCS, it is implemented in a real system with a shunt reactor, and the results are then compared with field measurements. A comparison of the results shows that the PTCS eliminates the voltage oscillations in the simulation before closing and provides a smooth voltage with the desired amplitude. Using the proposed model, the maximum line switching overvoltage is correctly calculated; this, in turn, results in a more accurate transmission line insulation design, which is technically and economically beneficial.

show abstract

Section: -Discussionmentioning

confidence: 94%

Section: -Switching In Transmission Linesmentioning

confidence: 99%

Frequency modeling of trapped charge source for transmission line switching studies in presence of shunt reactor using EMTP/ATPDraw

Akafi-Mobarakeh

Shariatinasab

Vahidi

2023

Preprint

View full text Add to dashboard Cite

show abstract

“…As the transient overvoltage generated by closing the no-load cable line is often serious, it is helpful for the insulation coordination of the power system. It is also the main research object of energization overvoltage [10]. Therefore, this paper takes the energization overvoltage of no-load cable as the research object; when the circuit breaker at the receiving end is always open, the circuit breaker at the sending end of the line is closed.…”

Section: Figure 1 the Circuit Of The 330kv Cable Transmission Linementioning

confidence: 99%

Fast Computation Method of Energization Overvoltage in Cable Lines Based on Numerical Inverse Laplace Transform

Wang

Gu²,

Zhu³

et al. 2023

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

Currently, the research on the energization overvoltage in cable lines is mainly realized through simulation calculation. However, the operation process is complex and the computation speed is slow when using the simulation software to calculate the energization overvoltage in the whole line. This paper presents a numerical calculation method of energization overvoltage in the entire cable line, which can greatly improve the calculation speed, simplify the operation process and have accurate calculation results. The method is based on transmission line theory, modal theory, transmission line equation’s complex frequency domain solution and Numerical Inverse Laplace Transform (NILT). This method first performs phase-to-mode conversion on the cable line and converts the mutually coupled cable conductors into mutually independent propagation modes. Furthermore, each independent propagation mode is conducted by Laplace Transform to obtain the complex frequency domain of its voltage. Finally, after the NILT is performed on the voltage complex frequency domain solution of each propagation mode and the time domain solution is obtained, the energization overvoltage of the full cable is obtained through the inverse phase-to-mode conversion. This method is applied to a 330kV cable line, and the calculation speed is significantly improved. The overvoltage calculation results have a small error compared to the obtained results using the simulation software, indicating that the method has high accuracy.

show abstract

“…UGCs have limited visual impact and are more resilient against earthquakes, storms, and freezing weather. Despite these benefits, the steady-state and the transient behaviour of a mixed transmission line are different from a sole OHL transmission line and depend on the combination of UGC and OHL and the type of sheath to earth connection [1]. Moreover, in a mixed line, the protection system must determine the fault section to prevent the operation of the reclosure function whenever the fault is on the UGC section [2].…”

Section: Introductionmentioning

confidence: 99%

A novel protection and fault location combined algorithm for mixed/hybrid lines

Aminirad

Shahrtash

2022

IET Generation Trans & Dist

View full text Add to dashboard Cite

This paper presents a novel protection and fault location combined algorithm for mixed overhead transmission lines (OHLs) and underground cables (UGCs). The method is based on applying the Morphological Gradient (MG) to the modal component of synchronized measured currents at both ends of the mixed line to detect the transient components generated by the fault. The proposed method utilizes the sign of superimposed components for discriminating internal and external faults and the difference between the times related to these transient components to detect fault location. The method has been evaluated through various simulations, whereas it has a very low computational burden, it is suitable for online applications. Results have shown high performance of the method against different fault inception angles (FIA), fault resistances, fault types, fault locations, combinations of OHL‐UGC, and even current transformer saturation, noise presence, long cable section, and different sheath‐ground connections.

show abstract

Statistical Analysis of Energization Overvoltages in EHV Hybrid OHL–Cable Systems

Cited by 24 publications

References 21 publications

Frequency modeling of trapped charge source for transmission line switching studies in presence of shunt reactor using EMTP/ATPDraw

Frequency modeling of trapped charge source for transmission line switching studies in presence of shunt reactor using EMTP/ATPDraw

Fast Computation Method of Energization Overvoltage in Cable Lines Based on Numerical Inverse Laplace Transform

A novel protection and fault location combined algorithm for mixed/hybrid lines

Contact Info

Product

Resources

About