Three-phase modeling of 40.5-kV vacuum circuit breaker switching off shunt reactors and overvoltage suppression measure analysis

Geng, Yun; Dong, Jinlong; Chen, Xinggui; Yan, Jing; Geng, Yingsan; Peng, Jing; Wang, Ke

doi:10.1016/j.epsr.2021.107058

Cited by 18 publications

(10 citation statements)

References 22 publications

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“…Due to the complexity of the operating conditions of shunt reactors, the uncertainty of the health state development, the fuzziness between the state levels, and other problems, a processing method based on the Gaussian Cloud Model (GCM) can be established. The certainty of cloud drops is the bridge between cloud drops and qualitative concept C, reflecting fuzziness [16][17][18] . The value of certainty is also a random value, which can be described by the probability distribution function.…”

Section: Multi-information Fusion Methodsmentioning

confidence: 99%

Operating State Evaluation Method of UHV Oil Immersed Shunt Reactors

Gu,

et al. 2023

J. Phys.: Conf. Ser.

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The oil-immersed shunt reactor is one of the most important reactive power compensation equipment in the ultra-high voltage (UHV) long-distance transmission and transformation system, which can solve the problem of large power and long-distance transmission that makes the capacitance effect of transmission lines obvious. At present, the commonly used state evaluation methods for UHV oil-immersed shunt reactors are mostly based on a certain factor or several factors to make judgments, without a comprehensive consideration of the overall operating condition information of the shunt reactors. There are various uncertainties in the process of fault diagnosis and state evaluation of the shunt reactors, and the accuracy and timeliness of the diagnosis results are poor. To solve the above problems, this paper combines the key characteristic parameters of oil immersed shunt reactor, such as vibration, chromatography, partial discharge, and oil temperature, and establishes a comprehensive evaluation method for the operating state of oil immersed shunt reactor based on Gaussian Cloud Model (GCM), and verifies its effectiveness through test data, whose R2 over 0.98. The test data show that this method can effectively judge the operation state of the UHV oil-immersed shunt reactor, which accuracy rate of state diagnosis is over 91%. The results of this paper can provide technical support for the application of UHV oil-immersed shunt reactor state assessment and diagnosis, and further improve the level of equipment operation and maintenance.

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Section: Multi-information Fusion Methodsmentioning

confidence: 99%

Operating State Evaluation Method of UHV Oil Immersed Shunt Reactors

Gu,

et al. 2023

J. Phys.: Conf. Ser.

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“…These overvoltages can potentially damage equipment, cause insulation breakdown, and compromise the reliability of the system [19]. The (1) indicates that as the chopped current level rises, both the stored energy and chopping voltage increase. Moreover, it's evident that current chopping significantly affects reactors with lower stray capacitance.…”

Section: Current Choppingmentioning

confidence: 99%

“…A shunt reactor is a type of electrical device used in power systems to compensate for reactive power. Reactive power is the power that oscillates between the generation and consumption of electric energy due to the presence of inductive or capacitive elements in the system [1]- [4]. Shunt reactors are specifically designed to consume or produce reactive power, the reactor bank should be switched off during periods of high load on the transmission line, based on the power system's needs [5], [6].…”

Section: Introductionmentioning

confidence: 99%

Impact of grading capacitor on transient recovery voltage due to shunt reactor de-energization for different values of current chopping

Al-Tak,

Ain,

Al-Yozbaky

et al. 2024

IJPEDS

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This paper investigates the impact of grading capacitors on transient recovery voltage (TRV) during shunt reactor switching in high voltage systems, considering different levels of current chopping. Shunt reactor de-energization can result in voltage surges and instability due to current chopping effects. The study utilizes simulation models using ATP-Draw software to assess the effectiveness of grading capacitors in mitigating TRV under various operating conditions as well as of using a proposed method to mitigate the excessive TRV across the circuit breaker. The findings provide valuable insights into managing TRV during shunt reactor switching, enhancing power system stability and reliability. The results obtained showed that the TRV across the circuit breaker decreased by 61.5% by using circuit modification as well as adding a grading capacitor.

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“…Since the stray capacitance of SR has a significant impact on the chopping overvoltage, both the phase‐to‐ground capacitances ( C A , C B , and C C ) and the inter‐phase capacitances ( C AB , C BC , and C CA ) should be considered. The values are set as 1500 pF in our case [27].…”

Section: Modelling Of Offshore Wind Farmmentioning

confidence: 99%

Investigation on overvoltage caused by vacuum circuit breaker switching off shunt reactor in offshore wind farms

et al. 2022

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The multiple reignitions of vacuum circuit braker (VCB) while switching off the shunt reactor in an offshore wind farm (OWF) would produce a high overvoltage. The post-arc process of ion movement in the vacuum interrupter is analysed. Considering the sheath growth and ion concentration variation, the expression for dielectric recovery strength inside the VCB interrupter is derived. A novel VCB model is implemented in the environment of electromagnetic transient programme based on the new reignition criterion. Then, the switching overvoltage is computed and analysed in detail. For the OWF with high rising rate of transient recovery voltage, the sheath growth must be considered in the VCB model; otherwise, the overvoltage may be underestimated. Using resistorcapacitor (RC) snubber, a new installation scheme is proposed to suppress the overvoltage in the OWF. The results indicate that the proposed scheme can not only reduce the peak and steepness of overvoltage but also damp the high-frequency oscillation. It would not affect the steady-state operation of OWF. Besides, the capacitor of RC snubber normally does not bear the electric stress, and its life expectancy would be greatly enhanced.

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Three-phase modeling of 40.5-kV vacuum circuit breaker switching off shunt reactors and overvoltage suppression measure analysis

Cited by 18 publications

References 22 publications

Operating State Evaluation Method of UHV Oil Immersed Shunt Reactors

Operating State Evaluation Method of UHV Oil Immersed Shunt Reactors

Impact of grading capacitor on transient recovery voltage due to shunt reactor de-energization for different values of current chopping

Investigation on overvoltage caused by vacuum circuit breaker switching off shunt reactor in offshore wind farms

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