KX8974c V24 HIEE320606R1 ABB Complete service of excitation controller

Description

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Air core reactor technology
Air core reactors are available in oil-free and oilfilled solutions. For moderate voltages and power
ratings, the most economical type of current
limiting reactor is usually a dry-type transformer
without an enclosure or active cooling →4.
Numerous reactors of this type are in operation
around the world, mostly in medium to highvoltage industrial power systems.
Air core reactors have larger footprints than iron-core
options. As a result, the magnetic field that spreads
freely in the surroundings may cause excessive
heating of iron reinforcements in objects like
concrete walls. For this reason these objects should
be located at sufficient distances so that magnetic
field strength values are below 80 A/m at the floor
and ceiling and below 30 A/m at adjacent walls.
ABB’s outdoor air core reactors utilize a proprietary
construction that gives the coils the industry’s
highest levels of mechanical strength for short
circuit and environmental protection. This advanced
construction has been validated during decades
of robust use by traction rolling stock and in
offshore oil and gas production facilities. The
construction features a vacuum impregnation
process that uses an unique Class H epoxy resin,
a dedicated oven-curing cycle to give the reactor
additional mechanical strength and a final coating
of protective varnish to shield against UV and
corrosive elements.
Field applications of air core reactors
Air core reactors are used for a variety of industrial
and utility field applications: harmonic filters, shunt
reactors, short-circuit current limiting, thyristor
controlled reactors, inrush damping, neutral
grounding, smoothing and electrical arc furnaces.
Harmonic filters are typically installed with capacitors
and resistors, close to the source of harmonics to
provide a low impedance path for harmonic currents;
they are tuned to a specific frequency to cancel or
mitigate the relevant harmonic.
Shunt reactors are employed when the
compensation of the capacity reactive power is
required; where lightly loaded long transmission
lines or cables are used. They are also installed on
the tertiary winding of a power transformer or on
the substation busbar system.
Short-circuit current limiters reduce the shortcircuit current to values accepted by the installed
circuit breakers when faults occur. Consequently,
standard equipment can be installed in the network
for high short-circuit currents.
Thyristor controlled reactors (TCR) are employed in
SVC systems for dynamic load balance in industrial
plants where large variable loads are installed. TCR
reactors, unlike shunt reactors, use thyristor valves
to continuously regulate current.
Inrush damping is commonly installed in series with
a shunt capacitor bank, which functions to limit the
inrush currents due to switching and the outrush
current of the capacitor bank.