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PRODUCTS
Reactors |
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DAMPING REACTORS FOR CAPACITOR BANKS |
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The transient switching and
inrush currents of a shunt capacitor bank can be limited by a damping
reactor connected in series with the bank. Damping reactors are
comparable to series reactors with low reactances. Their voltage
strength requirements, however, are often higher than those of series
reactors. Our damping reactors are used all over the world in various
environmental conditions.
Reactors brochure (.pdf) |
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FILTER
REACTORS |
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Filter has two functions, namely
to produce capacitive reactive power at basic frequency and to filter
out harmonics. A harmonic filter is designed to have a small impedance
between phase and earth, or between the phases at required harmonic
frequency. Therefore the harmonic current will flow into the filter and
not into the network. Normally each harmonic frequency required has a
separate filter circuit. For higher harmonic frequencies, a wide-band
filter is used. Nokian Capacitors Ltd. manufactures filter reactors to
the customer's specification. Our filter reactors may be equipped with
off-load tappings to make an adjustment possible at the required
frequency.
Reactors brochure (.pdf) |
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SHUNT REACTORS |
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Shunt reactors are used to
compensate for capacitive reactive power generated by long lightly
loaded transmission lines. Shunt reactors are switched on/off by
breakers and are normally connected to the tertiary winding of the main
transformer. Reactors are available up to 36kV voltage level and 100MVA
power.
Reactors brochure (.pdf) |
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CURRENT LIMITING REACTORS |
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Current limiting reactors are
mainly used to limit short-circuit current, i.e. to prevent fault
currents from rising to values dangerous for the equipment. Normal types
of breakers, cables and equipment can thus be used instead of those with
higher short-circuit power rating. This means savings in money. A series
reactor consists of three phase coils, generally stacked on each other
with support insulators between them. The support insulators provide
enough space between the phases to ensure that the mutual inductance
between the coils is negligible compared to the main inductance. In
making the concrete foundations, close loops in the reinforcement steel
must be avoided. The magnetic clearances for metal constructions are
given in our reactor specification.
Reactors brochure (.pdf) |
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THYRISTOR CONTROLLED REACTORS |
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Thyristor controlled reactors,
called TCR-reactors, are used in Static Var Compensation systems. TCR-reactors
are similar to shunt reactors, but the current is continuously
controlled by thyristor valves. The three phase reactor is delta
connected. Each phase reactor is split into two coils and the thyristors
are connected between the coils. TCR reactors are available up to 36kV
voltage and up to 180MVA power.
Reactors brochure (.pdf) |
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NEUTRAL EARTHING REACTORS |
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A neutral-earthing reactor is
connected between the neutral point of the three-phase system and the
earth. Its purpose is to limit the line-to-earth current of a directly
earthed network or to reduce the line-to-earth current of an insulated
line to a value suitable for protection.
Reactors brochure (.pdf) |
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