High Current Interruption by SF<sub>6</sub> Disconnecting Switches in Gas Insulated Switchgear

Yanabu,; Nishiwaki,; Mizoguchi,; Shimokawara,; Murayama,

doi:10.1109/mper.1982.5519361

Cited by 2 publications

(2 citation statements)

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“…4. Some conventional disconnectors, SF 6 switches and oil switches have such design [13,[17][18][19][20], which is characterised by lateral contact overlap in closed state. The lateral overlap, denoted as OL, implies that contacts will accelerate to a non-zero velocity at the separation instant.…”

Section: Topology For Considered Switch Smentioning

confidence: 99%

Series LC DC circuit breaker

Jovcic

2019

High Voltage

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The article proposes a mechanical DC circuit breaker (CB) based on a series LC circuit. It requires two switches (a fast disconnector and an AC circuit breaker), an inductor and a capacitor, and therefore the cost is expected to be low. A series LC circuit is analysed and it is concluded that fault current will always have natural zero-current crossings which enable use of simple AC CBs. The current commutation into a capacitor is investigated since this is important for successful operation. A number of analytical conditions are derived for the voltage stress across disconnector contacts which enable arc-less contact opening. Experimental results on a 900 V laboratory prototype LC DC CB illustrate successful DC fault clearing, with commutation of 130 A and peak DC current of 190 A. A detailed PSCAD model for 320 kV LC DC CB is developed and DC fault clearing is evaluated in order to understand the possible benefit for high-voltage direct current applications. Further comparisons with the commercialised hybrid DC CB and mechanical DC CB on 320 kV system illustrate some benefits in terms of performance and simplicity. The mechanical LC DC CB operates very fast because of early capacitor insertion, and this results in low peak current and energy dissipation.

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Section: Topology For Considered Switch Smentioning

confidence: 99%

Series LC DC circuit breaker

Jovcic

2019

High Voltage

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“…The use of transverse magnetic fields to continuously move an electric arc on the electrode surface has been studied regularly in the past [32], often with the goal of reducing localized heating and electrode erosion [33]. It has also been suggested as a method to improve switching performance of disconnectors [34]. The majority of published concepts rely on one or more coils in the vicinity of the arcing electrodes to create a transverse magnetic field using the switching current.…”

Section: Fast-acting Disconnector: Resultsmentioning

confidence: 99%

Improving GIS Disconnectors for Future HVDC Applications

Ritter

Straumann

Franck

2019

IEEE Trans. Power Delivery

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Abstract-The use of standard HVac disconnectors for bustransfer switching in future HVdc gas insulated switchgear (GIS) has been demonstrated successfully in past research through simulation and testing. Prolonged arcing times through reignitions caused by high frequency harmonics as well as the proposed extension of GIS disconnector switching cases, however, create an HVdc-specific demand for more advanced disconnector concepts capable of withstanding higher switching stresses and increased recovery voltages. A spring-loaded disconnector designed for use in HVac mixed technology switchgear (MTS) was found to shorten the time to first current zero through an accelerated increase of the arcing voltage compared to standard disconnectors. Despite its increased switching performance, the reignition characteristics of this fast-acting disconnector were found to largely follow the previously established extinction criterion, which enables further simulation of similar technologies for HVdc applications. To additionally combat the issue of contamination of HVdc GIS by electrode erosion products, a prototype disconnector was improved using permanent magnets to evoke arc rotation. Erosion tests in air have shown an effective reduction of electrode erosion for long arcing times at currents typical for disconnector switching while bus-transfer tests revealed promising enhancements of the reignition behavior.

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High Current Interruption by SF₆ Disconnecting Switches in Gas Insulated Switchgear

Cited by 2 publications

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Series LC DC circuit breaker

Series LC DC circuit breaker

Improving GIS Disconnectors for Future HVDC Applications

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High Current Interruption by SF6 Disconnecting Switches in Gas Insulated Switchgear

Cited by 2 publications

References 0 publications

Series LC DC circuit breaker

Series LC DC circuit breaker

Improving GIS Disconnectors for Future HVDC Applications

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High Current Interruption by SF₆ Disconnecting Switches in Gas Insulated Switchgear