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Isolated Phase Bus is
supplied for voltage ranges from 4.16 kV to 38kV and rated currents up to
30,000A with natural cooling and up to 55,000A utilizing forced air
cooling. The Isolated Phase Bus system is normally used for the
transmission of electric power in the main circuit between the generator
and the generator
step-up transformer, with tap offs to the unit auxiliary service
transformer, excitation
transformers, surge protective cubicles and the other ancillary equipment;
utilized in hydroelectric powerplants, gas, coal fired or nuclear power
plants.
Isolated Phase Bus complies with ANSI C37.23 and IEC60298/60694 standards
with protection degree IP 65.
Enclosures are all welded construction and can be supplied pressurized
with dry air free to maintain an environment free from pollutants, thereby
minimizing maintenance stoppages of the plant ensuring high operational
reliability and power output.
The conductors and enclosures are manufactured of high conductivity
aluminum and each phase conductor is enclosed by a coaxial and individual
housing which provides an air clearance between each phase of enclosure.
With this configuration it is impossible to have a phase-to-phase short
circuit condition; dynamic efforts and stresses during short circuits are
reduced to a minimum as a result.
The conductors are self centered and secure fastened inside enclosures by
1,2 or 3 sets of insulators that can be mounted as sliding or fixed points
in order to allow free movement of conductors and compensate for
differential expansion of materials.
Insulators are made of porcelain or epoxy resin for high creepage and high
mechanical properties.
Applications:
- Main circuit bus in hydroelectric power plants, gas, coal fired or
nuclear or pump storage power plants.
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