Air core reactors Brochure0 pages

ACR
Power compensation
Air-Core Reactors – Dry Type
Air-Core Reactors (ACR) provide a linear response of impedance versus current which
is essential for numerous applications. The dry type design is maintenance free and
environmentally friendly.
Alstom Grid has more than 50 years’ experience
in designing and manufacturing Air-Core
Reactors for various market segments around
the world, including power generation, T&D
networks, industrial facilities, OEMs and
electrical test laboratories.
For both industrial environments and
networks, Alstom Grid offers a broad
range of cost-effective solutions:
• Current-limiting reactors limit the fault
currents to levels compatible with existing
protection/control equipment and as a result
provide for a very cost-effective solution.
• Neutral-earthing reactors are connected
between the neutral of a power system and
earth to limit the line-to-earth current to
a desired value under system earth fault
conditions.
• Smoothing reactors reduce the harmonic
currents and transient overcurrents (ripple)
in DC systems.
• Harmonic filter reactors are usually
•
connected with capacitors and resistors in
filter circuits to reduce harmonic content
in the network which cause higher losses,
high neutral currents and interference
with computer and telecommunications
equipment and which are responsible for
high harmonic distortion levels.
Shunt reactors compensate for the
capacitive currents of long transmission lines
or cables, allowing more active energy to
pass through the system.
• Damping reactors limit the inrush and
outrush currents of capacitor banks.
• Discharge reactors are used in the bypass/
discharge circuit in series compensation
systems to limit the capacitor discharge
current.
• Arc-furnace series reactors provide the
necessary power factor correction and
limit the unstable arc-furnace current and
voltage.
• Power flow control reactors control the
current into two or more parallel circuits.
• Motor starting reactors are connected
in series with a motor to limit the inrush
current during the motor starting operation.
• Special applications: test lab reactors are
special ACRs used in test laboratories,
mainly for current-limiting purposes. Other
devices include duplex current-limiting
reactors, split-phase shunt or zero tolerance
reactors, etc.
Customer Benefits
• igh mechanical strength
H
to withstand elevated shortcircuit forces
• ow noise level for noise
L
sensitive applications
• onservative temperature
C
rise for extended service life
• ustomized space saving
C
solutions for installations in
compact areas
• urface treatment for
S
protection against UV
radiation and pollution
• inimum maintenance
M
requirements and
environmentally friendly
GRID
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