Interrupting Characteristics of Paralleled SF<sub>6</sub>Circuit Breakers With a Highly Coupled Split Reactor

Guo, Zhendong; Li, Xingwen; Su, Haibo; Wu, Yihong; Jia, Shenli; Wang, Yong; Gu, Lixin

doi:10.1109/tcpmt.2017.2677524

Cited by 13 publications

(5 citation statements)

References 27 publications

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“…The voltage uS(j) at the head of each turn could be enough for getting potential distribution in HCSR, given that the voltages at the end of adjacent turns are the same. Combining (7) and boundary conditions to simplify (4), the results are as follows [23]:…”

Section: ) Current Sharing Statementioning

confidence: 99%

“…The results are rough and unable to check whether the insulation between turns or arms meets the demand or not. In [6] and [7], the transient overvoltages between both ends of HCSR were analyzed under different working conditions, but the results are only applicable to the circuit topology proposed in articles, and do not involve the internal overvoltage of HCSR.…”

Section: Introductionmentioning

confidence: 99%

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Voltage Distribution Analysis of High Coupled Split Reactor in 500 kV AC Fault Current Limiter

Yuan

et al. 2020

IEEE Access

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With the increase of short circuit current, measures should be taken to reduce the impact. Among various measures, a new technique to interrupt or limit current is proposed and applied to power grid based on high coupled split reactor (HCSR). As the key equipment in new technique, the insulation design of HCSR is a priority. Previous works mainly involve voltage across HCSR in different working states, and take the whole voltages as design requirements. It is rough and takes no account of voltage distribution inside HCSR, thus not suitable for insulation design of HCSR. In order to analyze the overvoltage problems and determine insulation demands for HCSR, this paper establishes the equivalent circuit model in turn unit to calculate the voltage distribution inside HCSR, which is simplified and accurate enough for HCSR. A 500 kV AC fault current limiter is briefly introduced, and voltages between turns or arms in HCSR are obtained. The voltage between turns are evenly distributed and voltage between arms are very low under switching impulse. As for lightning impulse, maximum turn-to-turn voltages mainly appear in the end of encapsulations, and the voltage between arms in current sharing state is considerable. This paper gives the calculation method and general rules of voltage distribution inside HCSR, and it has great significance for the insulation design of HCSR.

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Section: ) Current Sharing Statementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Voltage Distribution Analysis of High Coupled Split Reactor in 500 kV AC Fault Current Limiter

Yuan

et al. 2020

IEEE Access

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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].…”

Section: Introductionmentioning

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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“…With the rapid development of power system, fault current levels continuously increase, and when a circuit breaker cannot interrupt a fault current, it will directly affect the safe and stable operation of the system [1]- [3]. To reduce the influence of fault currents on power system, a parallel-type circuit breaker based on a high-coupling split reactor was proposed in [4] and [5], which increased the breaking capacity. The coupling reactor is an important piece of equipment, and its main performance parameters, such as the single-arm inductance, coupling factor and carrying current capacity, can be enhanced by increasing the encapsulation number, air ducts width and overall size of the structure, but these modifications lead to increased metal conductor usage.…”

Section: Introductionmentioning

confidence: 99%

Optimization Design of a High-Coupling Split Reactor in a Parallel-Type Circuit Breaker

et al. 2019

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In this paper, in accordance with the breaker requirements of a parallel-type circuit breaker based on a high-coupling split reactor, the structure of a coupling reactor is proposed, and the influences of the inner radius, encapsulation height, air ducts width, and encapsulation number of the reactor on coupling factor is analyzed. The reactor design is optimized to minimize metal conductor usage, and the initial design parameters of the coupling reactor are selected based on equal height and heat flux of the coaxial encapsulations. Meanwhile, combined thermal and electromagnetic optimization method and heat load optimization are adopted considering a single-arm limiting current and two-arm flow current working conditions. The optimization results show that the metal conductor usage of the coupling reactor is only 63% compared to a design based on the initial design parameters, and the correctness of the optimization is verified by simulation results. INDEX TERMS Parallel-type circuit breaker, coupling reactor, metal conductor usage, combined thermal and electromagnetic optimization, heat load optimization.

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Interrupting Characteristics of Paralleled SF₆Circuit Breakers With a Highly Coupled Split Reactor

Cited by 13 publications

References 27 publications

Voltage Distribution Analysis of High Coupled Split Reactor in 500 kV AC Fault Current Limiter

Voltage Distribution Analysis of High Coupled Split Reactor in 500 kV AC Fault Current Limiter

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

Optimization Design of a High-Coupling Split Reactor in a Parallel-Type Circuit Breaker

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Interrupting Characteristics of Paralleled SF6Circuit Breakers With a Highly Coupled Split Reactor

Cited by 13 publications

References 27 publications

Voltage Distribution Analysis of High Coupled Split Reactor in 500 kV AC Fault Current Limiter

Voltage Distribution Analysis of High Coupled Split Reactor in 500 kV AC Fault Current Limiter

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

Optimization Design of a High-Coupling Split Reactor in a Parallel-Type Circuit Breaker

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Interrupting Characteristics of Paralleled SF₆Circuit Breakers With a Highly Coupled Split Reactor