The Current Impulse Laboratory (AT4), established by Cepel in 1983, performs current impulse tests and provides support to the research and development of silicon carbide (SiC) and zinc oxide (ZnO) lightning arresters, checking their protective features and operational characteristics.
For this purpose, the laboratory simulates lightning discharges and submits materials to type tests, following Brazilian and international standards. Located in the Adrianópolis Unit, AT4 is the only Brazilian laboratory able to perform tests to check the direct effects of atmospheric discharges on airplane structures, components and metallic parts. For this reason, the laboratory is very important to the Brazilian aircraft industry, which previously depended on foreign laboratories for these services.
The laboratory performs the experimental inspections necessary for the research project "Electric Arc modeling for Single phase Reclosing (Modelarco)", developed jointly with Eletrobras Furnas and the Alberto Luiz Coimbra Institute for Graduate Studies and Research in Engineering of the Federal University of Rio de Janeiro (COPPE/UFRJ).
The following pieces of equipment are available at the laboratory:
• Regulated power supply for 0 to 8 kV 2.5 MVA 60 Hz
• Regulated power supply for 0 to 15 kV 5 MVA 60 Hz
• Constant voltage source 400 kVdc
• 69 kVef 25 kVA transformer
• 100 kVef 200 kVA transformer
• 360 kV current impulse generator
• Measurement system for registering tests (oscilloscope, etc)
Adopted standards and/or procedures
• NBR 5470/1986
• NBR 5470/1986
• NBR 5309/1991
• NBR 14584/2000
• NBR 5287/1988
• NBR 6936/1992
• NBR 14566/2004
• ARP 5412/1999
• ARP 5416/2005
• ARP 5414/1999
• ANSI C62-11/2005
• ANSI C62-1/1989
• IEC 99-4/2006
• IEC 99-1/1991
• MILITARY STANDARD MIL-STD 175A/1983.