Basic investigation of a high-speed vacuum circuit breaker and its vacuum arc characteristics

Niwa, Y.; Funahashi, T.; Yokokura, K.; Matsuzaki, Jun; Homma, M.; Kaneko, Eiji

doi:10.1049/ip-gtd:20045276

Cited by 37 publications

(14 citation statements)

References 1 publication

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“…The contribution of all the elements is integrated over the entire cross-section to obtain the magnetic flux density produced by the rail electrode (see (3)) .…”

Section: Derivation Of Equationmentioning

confidence: 99%

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Influence of petal parameters on the electromagnetic force driving the arc in RMF type vacuum interrupters

Bhat

Kulkarni

2018

IET Electric Power Applications

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The SWASTIK type radial magnetic field (RMF) contact design is widely used in vacuum interrupters. The mutually perpendicular petal limbs are a unique feature of this contact design. The focus of this work is to relate the Lorentz force acting on the arc with petal dimensions through closed-form expressions. Considering the petal limbs as equivalent to finite current carrying conductors, analytical equations are derived to compute the magnetic flux density at any point in space. The results are verified by using finite-element method (FEM) simulations of rail electrodes. The expressions are then used to compute the Lorentz force on the arc in SWASTIK contacts. The analytical predictions are compared with three-dimensional FEM simulations of a CAD model of the contacts. Applicability of the analytical results is investigated in the context of parametric variation of the radius, length and position of the arc and temporal variation of the contact current. The present work can be used in the first iteration of contact petal design. It is also applicable for the design of rail gun geometries.

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“…The contribution of all the elements is integrated over the entire cross-section to obtain the magnetic flux density produced by the rail electrode (see (3)) .…”

Section: Derivation Of Equationmentioning

confidence: 99%

“…Vacuum circuit breakers are finding increased usage in a wide spectrum of applications [1,2] besides the medium voltage range due to their robustness [3]. Radial magnetic field (RMF) contact design has been the workhorse of vacuum interrupters (VIs) since its inception.…”

Section: Introductionmentioning

confidence: 99%

Influence of petal parameters on the electromagnetic force driving the arc in RMF type vacuum interrupters

Bhat

Kulkarni

2018

IET Electric Power Applications

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“…More and more applications [1,[8][9][10] are now emerging requiring specific vacuum interrupter designs, such as Metallic Return Transfer Breakers (MRTB) for HVDC, breakers at sub-transmission levels, compact multifunctional interrupters incorporating disconnection/earthing function, high-speed generator circuit breakers etc.…”

Section: Designing a Vacuum Interruptermentioning

confidence: 99%

Challenges For Vacuum Interrupter Design

Parashar¹,

Baker²,

Sitzia³

2006

2006 International Symposium on Discharges and Electrical Insulation in Vacuum

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Vacuum interrupters form the key component of a medium voltage (MV) vacuum switchgear design. Vacuum interrupter technology is now well established and key manufacturers across the world are routinely producing interrupters for ratings up to 52kVrms. Manufacturers have focussed on reducing the cost of interrupter components by adapting to more efficient contact geometry, improved contact materials, finite element modelling for improved field distribution and new processing techniques. However, these methods are now such that further cost reductions are becoming difficult. This may become a driving force to improve design capability with further scope for cost reductions. For example, in the low voltage (LV) sector (<1kV) vacuum interrupters are available at costs that are much higher than air break switches. Similarly, in the high voltage (HV) sector (52kV< Ur < 145kV) no efficient and cost effective designs are available, and in addition, radiation related safety concerns must be considered. This paper explores the existing switchgear portfolio in LV, MV and HV segments, corresponding demand and emerging market needs for vacuum interrupters and explores areas where the technology needs to be developed and new products brought to market.

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“…A dc breaker prototype fitted with a high-speed actuator was designed and tested in an inductive circuit [3]. The forced current zero process was observed by a high-speed camera [4], and it found that the current was difficult to interrupt when vacuum arc gathered. The influences of the electrode distance on vacuum arc characteristics were analyzed through simulations [5].…”

Section: Introductionmentioning

confidence: 99%

Influence of the Contact Opening Speed on DC Vacuum Arc

Qin

Dong

Wang

et al. 2015

IEEE Trans. Plasma Sci.

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Arc determines whether the vacuum switchgears can break current successfully, so it is significant to study its characteristics. In this paper, a hybrid high-speed actuator was designed, and a method of forced current zero was used to interrupt dc in a synthetic test circuit. With the different contact opening speeds, the processes of arc burning and current transferring were observed by a high-speed CMOS camera. Through the arc area obtained by an image processing technology, the influences of the opening speed on arc were researched, including the influences in the initial arc burning stage, in the forced current zero stage, and at the same electrode distance. The results indicate that with the increase of the opening speed in a certain range, the arc area in the forced current zero stage tends to be small, and the one in the initial arc burning stage spreads more quickly. Although the arc area increases with the opening speed in the initial arc burning stage, its impact on the whole dc current transferring process is slight when the contact opening speed is high. So, high opening speed is helpful to extinguish arc and transfer current. In addition, there is another discovery in the experiments. In a certain range, when the opening speed is higher, arc burns stably earlier, and the arc area is smaller in the stable burning stage. So, it is beneficial to inject the transferring current in this stage. Experimental results and analysis of the arc images prove that increasing the opening speed is useful to transfer the current successfully and recover the dielectric strength of the electrode distance.Index Terms-DC interruption, forced current zero, highspeed actuator, image process, vacuum arc.

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Basic investigation of a high-speed vacuum circuit breaker and its vacuum arc characteristics

Cited by 37 publications

References 1 publication

Influence of petal parameters on the electromagnetic force driving the arc in RMF type vacuum interrupters

Influence of petal parameters on the electromagnetic force driving the arc in RMF type vacuum interrupters

Challenges For Vacuum Interrupter Design

Influence of the Contact Opening Speed on DC Vacuum Arc

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