- REPAIR - FABRICATION - DESIGN - MODIFICATION
BUS BAR SYSTEMS
Secondary bus systems transfer the
electrical current from the transformer to the furnace cable attachment
through the vault wall. The photographs below are two examples of
bus systems fabricated at Erie’s plant in Medina, Ohio.
Water cooled secondary bus system. Water-cooled section
fabricated from Oxygen-free, high conductivity seamless copper
tube. ETP copper plates used as stubs in the fabrication of
this critical piece of equipment are skillfully welded together
by certified welders.
Air cooled secondary bus system fabricated from cold-rolled
ETP copper plate. Electrical conductivity is in excess of
100% IACS. Forming, drilling and finishing functions must
be precise for this type of equipment to function properly
in the secondary circuit.
Both air and water cooled systems
utilize kiln-dried hard timbers for suspension.
Bus systems are sized by determining
the proper amount of cross-sectional area of copper required to
carry the maximum amount of current the transformer is capable of
delivering. The commonly accepted design criteria for making this
determination, assuming high conductivity copper materials are being
used is: 3,000 amps per square inch for water cooled applications
and 900 amps per square inch for air cooled applications.
Erie Copper Works fabricates, maintains
and designs secondary bus systems. Regardless of design method or
attachment to the transformer or suspension system, bus systems
are subject to failures caused by dirt, insulation breakdown or
arcing at loose connections. In addition water cooled systems can
fail because of water leaks or condensation which forms on the water
cooled sections when certain conditions exist.
Call Erie Copper if you would
like specific recommendations regarding routine and periodic maintenance
procedures for your secondary bus system.
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