Influence of Different Factors on the Interruption Characteristics of Paralleled of High-Voltage SF6 Circuit Breakers with a Highly Coupled Split Reactor

Su, Haibo; Mo, Wenxiong; Wang, Yong; Gan, Lin; Liu, Junxiang; Guo, Zhendong; Gu, Lixin; Zhu, Lu; Chen, Li; Qiao, Shengya

doi:10.1007/978-3-030-31676-1_29

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“…All of these FCLs face common challenges such as low economic efficiency and low reliability with respect to high-voltage applications. In recent years, a dry air-core highly coupled split reactor (HCSR) was developed and used to make current distribute evenly in a parallel-connected circuit breaker (CB) for a higher interruption capacity, which was validated in a 252 kV power system [12][13][14][15][16][17][18]. Based on the HCSR and fast vacuum switches, our project team proposed a scheme of a new FCL, as shown in Figure 1 [19].…”

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confidence: 99%

Analysis of influence of a novel inductive fault current limiter on the circuit breaker in 500 kV power system

et al. 2021

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A contribution to the engineering application of a proposed 500-kV fault current limiter (FCL) is presented. A new type of FCL composed of a highly coupled split reactor (HCSR) and fast switches is proposed. When the circuit breaker (CB) in series with the FCL in the 500-kV power system interrupts the limited fault current, the rate of rise of the recovery voltage (RRRV) reaches a value much higher than the rated value. Based on a simplified equivalent single-phase circuit, the influence of the new FCL on the interruption procedure of the CB is simulated and discussed. The simulation results show that the high RRRV is caused by highfrequency resonant oscillations between the HCSR and its parasite capacitance. Analysis indicates that when the reactance of the FCL is close to the short circuit reactance of the system, the RRRV will reach the highest value. To solve this issue, we proposed installing a shunt capacitor with the FCL. Simulation results showed that the RRRVunder all fault modes could be restrained to below the rated value by introducing a certain shunt capacitor.This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.

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