Suppression of VFT in 1100 kV GIS by adopting resistor-fitted disconnector

Yamagata, Y.; Tanaka, Kenichiro; Nishiwaki, S.; Takahashi, Nobuyuki; Kokumai, T.; Miwa, Isao; Komukai, Toshihiko; Imai, Koji

doi:10.1109/61.489346

Cited by 54 publications

(21 citation statements)

References 4 publications

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“…The most up-to-date overview of main methods for VFTO attenuation in GIS is given in papers [10], [11]. They include: disconnector equipped with damping resistor [12], disconnector with reduced voltage due to the trapped charge reduction during the disconnector opening operation (the so called Trapped Charge Voltage, TCV) [3,13], application of high frequency resonators [14], and application of magnetic material of different types [15], [16], [17], [18], [19], [21].…”

Section: B Overview Of Main Vfto Attenuation Methodsmentioning

confidence: 99%

New Concept for VFTO Attenuation in GIS with Modified Disconnector Contact System

Szewczyk

Piasecki

Wroński

et al. 2015

IEEE Trans. Power Delivery

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This paper investigates on a new concept for Very Fast Transient Overvoltages (VFTO) attenuation in GasInsulated Switchgear (GIS). The concept, first introduced by the authors in this paper, involves modification of the GIS disconnector contact system in order to dissipate the VFTO energy in damping elements placed inside the GIS busbar conductor. The concept is an alternative to the state-of-the-art method in which magnetic rings are placed in the space between the GIS conductor and the enclosure. The proposed arrangement has no impact of the damping element on the dielectric design of the GIS busbar, as well as highly reduces the impact on the GIS thermal design. The paper presents analyses which show feasibility of the concept, through 1) principles which govern voltage conditions inside the GIS busbar, and 2) full-Maxwell FEM electromagnetic simulations of VFTO attenuated with the use of the proposed concept.Index Terms--Very Fast Transient Overvoltages (VFTO), GasInsulated Switchgear (GIS), disconnector switch, resistive and magnetic material, attenuation, damping, transients, switching I. 0885-8977 (c)

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Section: B Overview Of Main Vfto Attenuation Methodsmentioning

confidence: 99%

New Concept for VFTO Attenuation in GIS with Modified Disconnector Contact System

Szewczyk

Piasecki

Wroński

et al. 2015

IEEE Trans. Power Delivery

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“…GIS LIWV 2400kV, can be considered a safety margin of 15% VFTO, not more than 2087kV. For GIS devices, IEC IEC60071-2:1996 [5][6][7][8] believes that the insulation insulation with the standard safety margin should be larger, 20%. Considering the VFTO wave front time is shorter than the lightning impulse wave time, the voltage of GIS insulation is slightly increased.…”

Section: The Damage Of Vfto For the Sysytemmentioning

confidence: 99%

Study on VFTO of XiMeng UHV substation 1000kV GIS substation

Xiu-cheng¹,

Liu²,

Li³

et al. 2017

Proceedings of the 2nd Annual International Conference on Electronics, Electrical Engineering and Information Science (EEEIS 20

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This paper presents the VFTO calculation and analyzing results of XiMeng UHV pilot project in China. The result shows that the maximum voltage amplitude of VFTO in GIS is 1981kV, so that the pre-insert switching on off resistance is not necessary to installed on disconnector. In this case , it will reduce the probability of GIS failure operation and the potential supply current, and the safety and reliability of UHV GIS system will be improved. Meanwhile,the VFTO of a transformer in GIS substation is not high when the transformer is connected to GIS by overhead line.

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“…When closing, auxiliary contact K1 first closed, access 100 Ω single-stage closing resistors, over a period of time (called the closing resistor connecting time), the main contact K closed. By doing these, it can achieve purpose of limit closing overvoltage [15,16]. Circuit breaker additional multistage closing resistor model shown in Figure 6, the principle is similar to circuit breaker additional single-stage closing resistor.…”

Section: (2) Linear Central Component Modelmentioning

confidence: 99%