Experimental Research on DC Interruption Characteristics of Vacuum Interrupter by Forced Current Zero

2021 ◽  
Author(s):  
Qiang Tang ◽  
Shenli Jia ◽  
Zongqian Shi
Keyword(s):  
Experimental Research ◽  
Vacuum Interrupter ◽  
Current Zero

Measurement of Transient Temperature Distribution at Anode Surface After Current Zero in Vacuum Interrupter

2021 ◽  
Vol 141 (11) ◽  
pp. 712-717
Author(s):  
Akira Daibo ◽  
Yoshimitsu Niwa ◽  
Naoki Asari ◽  
Wataru Sakaguchi ◽  
Yo Sasaki ◽  
...  
Keyword(s):  
Temperature Distribution ◽  
Anode Surface ◽  
Transient Temperature ◽  
Vacuum Interrupter ◽  
Transient Temperature Distribution ◽  
Current Zero

scholarly journals Emission Spectroscopy During High-Current Anode Modes in Vacuum Arc

2017 ◽  
Vol 4 (3) ◽  
pp. 249-252
Author(s):  
A. Khakpour ◽  
R. Methling ◽  
St. Franke ◽  
S. Gortschakow ◽  
D. Uhrlandt
Keyword(s):  
Emission Spectroscopy ◽  
Optical Emission ◽  
Metal Vapor ◽  
Vacuum Arc ◽  
Anode Surface ◽  
High Current ◽  
Temporal And Spatial Distribution ◽  
Vacuum Interrupter ◽  
Ionic Copper ◽  
Current Zero

A vacuum interrupter reaches its interruption limit once high-current anode phenomena occur. High-current anode modes lead to an increase of the anode surface temperature and an increased generation of metal vapor, which may result in a weakening of the dielectric recovery strength after current zero. In this work, different discharge modes in a vacuum arc for AC 50 Hz including diffuse, footpoint, anode spot type 1 and type 2, and anode plume are investigated. Electrodes made of CuCr7525 with diameter of 10 mm are used. The final gap length is about 20 mm. Time and space resolved optical emission spectroscopy is used to examine the temporal and spatial distribution of atomic and ionic copper lines. The distribution of atomic and ionic lines parallel and perpendicular to the anode surface is investigated. Radiator density is also determined for CuI, CuII, and CuIII near the anode surface.

scholarly journals Properties of Vacuum Arc Influenced by Electrode Diameter and Material in TMF Contact Based on Forced Current Zero

2017 ◽  
Vol 4 (1) ◽  
pp. 36-39
Author(s):  
W. Huo ◽  
J. Wu ◽  
Y. Deng ◽  
X. Jin ◽  
L. Zhu
Keyword(s):  
Electrical Equipment ◽  
Transverse Magnetic ◽  
Vacuum Arc ◽  
Expansion Velocity ◽  
Electrode Diameter ◽  
Vacuum Interrupter ◽  
Dc Power ◽  
Electric Aircraft ◽  
Current Zero ◽  
Supply Systems

With the increase in electrical equipment in More/All Electric Aircraft, 270 V dc power supply systems will be needed. One method for DC interruption is forced current zero (FCZ). Based on FCZ technology with transverse-magnetic-field (TMF) contact, the spiral-type contacts are designed. Experiments with different currents are carried out with contact diameters being 30 mm, 40 mm, and 50 mm, and arcing surface materials Cu-W80 alloy and Cu-Cr50 alloy respectively. It is indicated by the experimental results that breaking capacity of vacuum interrupter and vacuum arc appearance are closely related to the electrode diameter and material. For the same size of electrode diameter, the breaking capacity in Cu-Cr50 is better than that in Cu-W80. With increasing electrode diameter, arc column expansion velocity and diameter increase gradually. Breaking capacity is increasing with larger contact diameter.

Post-arc current measurement and interruption performance of vacuum interrupter in DC interruption

2021 ◽  
Author(s):  
Qiang Tang ◽  
Shenli Jia ◽  
Zongqian Shi ◽  
Yongpeng Mo
Keyword(s):  
Plasma Density ◽  
Failure Modes ◽  
Circuit Breakers ◽  
Transient Model ◽  
Vacuum Interrupter ◽  
Memory Time ◽  
Promising Solution ◽  
Arc Current ◽  
The Common ◽  
Current Zero

Abstract In the DC grid, fault current rises very fast due to low impedance. Fast DC circuit breakers are needed to isolate faults and avoid a collapse of the common DC grid voltage. Based on the forced current zero (CZ) technology, the vacuum interrupter (VI) equipped with fast electromagnetic repulsion mechanism is a very promising solution of fast DC interruption. The experimental research on the DC interruption characteristics of a VI, namely by examining the post‑arc current (PAC) is presented in this paper. The dependence of the interruption capability on the PAC is analysed. What’s more, the failure modes of the VI under various experiment conditions are summarized. A former finding was that not all the arcing history which starts from the electrodes separating to the CZ has influence on the PAC but only a very short duration of several microseconds right before the CZ takes effects. New experiment results are added in this paper to support the former finding. Another former finding was that a longer electrode separation will bring about higher PAC. In this paper, both the influence of the arcing memory time and the electrodes separation are owed to a higher residual plasma density, which is verified by a model for calculating the residual plasma density and the continuous transient model (CTM) for calculating PAC.

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