scholarly journals Experimental Study on Arcing Effects to Contact Materials in 270V dc

2017 ◽  
Vol 4 (1) ◽  
pp. 61-65 ◽  
Author(s):  
Q. C. Zhu ◽  
Z. B. Li ◽  
J. Wei ◽  
Z. X. Liu ◽  
J. Huang ◽  
...  
Keyword(s):  
Experimental Study ◽  
High Voltage ◽  
Electrical Contact ◽  
Large Capacity ◽  
Contact Materials ◽  
Dc Voltage ◽  
Contact Erosion ◽  
Contact Life ◽  
Electromagnetic Relays

As supply DC voltage levels in automobiles, aviation and aerospace are becoming higher, high voltage and large capacity compact DC electromagnetic relays or contactors are becoming more important. In this paper, experiments were conducted at DC 270V/100 A in air and nitrogen, respectively, with CuCr40, CuCr45, CuCr50, CuW60, CuW70 and CuW90 as contact materials. Welding resistance (corresponding to electrical contact life), contact erosion and breaking arc durations were measured, and the obtained results were discussed.

scholarly journals Comparative Study of the Properties of Cu-Cr-Mo System Electrical Contact Material by Sintering and Infiltration Methods

Metals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 700
Author(s):  
Yeong-Woo Cho ◽  
Jae-Jin Sim ◽  
Jong-Soo Byeon ◽  
Taek-Soo Kim ◽  
Kee-Ahn Lee ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Relative Density ◽  
High Voltage ◽  
Raw Materials ◽  
Electrical Contact ◽  
Green Compact ◽  
Contact Material ◽  
Mixed Powder ◽  
Contact Materials ◽  
Infiltration Method

Contact materials in high-voltage vacuum interrupters require properties such as high conductivity, density and hardness to minimize arc heat damage. In this study, Cu–Cr–Mo alloy contact materials were examined for their usage as high-voltage contact materials. Ball milling was performed after analyzing the raw materials of the Cu, Cr and Mo powders. A green compact was produced using high pressure with a mixed powder. Subsequently, the composite was produced by sintering via the temperature and infiltration method according to the Cu content in the green compact. The composite sintering method produced a density of 8.55 g/cm3 (relative density 93%), a hardness of 217 HV and an electrical conductivity of 40.7% IACS at 1200 °C. The composite of 10 wt.% Cu produced by the Cu infiltration method exhibited a density of 8.7 g/cm3 (relative density 94%), hardness of 274 HV and electrical conductivity of 39 IACS% at 1300 °C. The measurements of the physical properties of our newly established method demonstrated a new possibility of using the Cu–Cr–Mo alloy as a contact material for high-voltage vacuum interrupters.

scholarly journals A Comparative Study on the Properties of Cu-Cr-Mo System Electrical Contact Material by Sintering and Infiltration Method

2020 ◽  
Author(s):  
Yeong-Woo Cho ◽  
Jae-Jin Sim ◽  
Sung-Gue Heo ◽  
Jong-Soo Byeon ◽  
Kee-Ahn Lee ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Relative Density ◽  
High Voltage ◽  
Electrical Contact ◽  
Green Compact ◽  
Contact Material ◽  
Mixed Powder ◽  
Contact Materials ◽  
Sintering Method ◽  
Infiltration Method

The contact materials in high-voltage vacuum interrupter require properties such as high conductivity, high density, and high hardness to minimize arc heat damage. In this study, copper–molybdenum-chromium alloys contact materials are examined for a high voltage contact material. Ball milling process was carried out after analyzing the raw materials of copper, chromium, and molybdenum powders. A green compact was produced using a high press with the mixed powder. Afterwards, composite was produced by sintering method according to temperature and infiltration method according to Cu content in green compact. The composite of sintering method showed a density of 8.55 g/cm3 (relative density 93%) a hardness of 217 HV, and an electrical conductivity of 40.7 IACS% at 1200 °C. The composite of 10 wt.% Cu produced by the Cu infiltration method showed a density of 8.7 g/cm3 (relative density 94%), Hardness of 274HV and electrical conductivity of 39 IACS% at 1300 °C. The measurements of physical properties showed the new possibility of using the Cu–Cr–Mo alloy as a contact material for high-voltage vacuum interrupters.

scholarly journals Spectroscopic analysis of high electric field enhanced ionization in laser filaments in air for corona guiding

2016 ◽  
Vol 4 ◽  
Author(s):  
Yingxia Wei ◽  
Yaoxiang Liu ◽  
Tie-Jun Wang ◽  
Na Chen ◽  
Jingjing Ju ◽  
...  
Keyword(s):  
Experimental Study ◽  
Femtosecond Laser ◽  
Electric Field ◽  
Corona Discharge ◽  
High Voltage ◽  
Fluorescence Spectra ◽  
Spectroscopic Analysis ◽  
Laser Pulses ◽  
Spectroscopic Measurement ◽  
High Electric Field

We report on a systematic experimental study on the fluorescence spectra produced from a femtosecond laser filament in air under a high electric field. The electric field alone was strong enough to create corona discharge (CD). Fluorescence spectra from neutral and ionic air molecules were measured and compared with pure high-voltage CD and pure laser filamentation (FIL). Among them, high electric field assisted laser FIL produced nitrogen fluorescence more efficiently than either pure CD or pure FIL processes. The nonlinear enhancement of fluorescence from the interaction of the laser filament and corona discharging electric field resulted in a more efficient ionization along the laser filament zone, which was confirmed by the spectroscopic measurement of both ionization-induced fluorescence and plasma-scattered 800 nm laser pulses. This is believed to be the key precursor process for filament-guided discharge.

Material transfer behavior of AgTiB2 and AgSnO2 electrical contact materials under different currents

2017 ◽  
Vol 114 ◽  
pp. 139-148 ◽  
Author(s):  
Hangyu Li ◽  
Xianhui Wang ◽  
Xiuhua Guo ◽  
Xiaohong Yang ◽  
Shuhua Liang
Keyword(s):  
Electrical Contact ◽  
Material Transfer ◽  
Contact Materials ◽  
Transfer Behavior ◽  
Electrical Contact Materials
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